diff --git a/.github/workflows/build-and-test-workflow.yml b/.github/workflows/build-and-test-workflow.yml index ef29c1cca..0b7abe707 100644 --- a/.github/workflows/build-and-test-workflow.yml +++ b/.github/workflows/build-and-test-workflow.yml @@ -47,7 +47,25 @@ jobs: - name: Install system-provided dependencies run: | - brew install boost doxygen libaec libomp + brew install boost doxygen gcc libaec libomp + + - name: Set Fortran compiler (macOS) + if: runner.os == 'macOS' + run: | + GFORTRAN_BIN="$(command -v gfortran || true)" + if [ -z "$GFORTRAN_BIN" ]; then + HOMEBREW_PREFIX="$(brew --prefix)" + GFORTRAN_BIN="$(find "$HOMEBREW_PREFIX/bin" -maxdepth 1 \( -type f -o -type l \) -name 'gfortran-*' | sort -V | tail -n 1)" + fi + + if [ -z "$GFORTRAN_BIN" ]; then + echo "Unable to locate Homebrew gfortran" >&2 + exit 1 + fi + + echo "Using Fortran compiler: $GFORTRAN_BIN" + echo "FC=$GFORTRAN_BIN" >> "$GITHUB_ENV" + echo "F77=$GFORTRAN_BIN" >> "$GITHUB_ENV" # Step: Set OpenMP environment variables (architecture-aware) - name: Set OpenMP environment variables @@ -58,7 +76,7 @@ jobs: else HOMEBREW_PREFIX="/usr/local" fi - + echo "HOMEBREW_PREFIX=$HOMEBREW_PREFIX" >> $GITHUB_ENV echo "LDFLAGS=-L$HOMEBREW_PREFIX/opt/libomp/lib" >> $GITHUB_ENV echo "CPPFLAGS=-I$HOMEBREW_PREFIX/opt/libomp/include" >> $GITHUB_ENV @@ -114,13 +132,14 @@ jobs: # Suppress unused parameter warnings on macOS 15 Intel runner (known platform-specific issue) SUPPRESS_PARAM_FLAG="-DSUPPRESS_UNUSED_PARAMETER_WARNING=ON" fi - + cmake \ -S ${{ github.workspace }} \ -B ${{ steps.paths.outputs.build_dir }} \ -DCMAKE_BUILD_TYPE=${{ inputs.build_type }} \ -DCMAKE_PREFIX_PATH=${{ steps.paths.outputs.ext_deps_dir }}/netcdf-c/install/netcdf-c \ -DCMAKE_INSTALL_PREFIX=${{ steps.paths.outputs.install_dir }} \ + -DCMAKE_Fortran_COMPILER="$FC" \ $SUPPRESS_PARAM_FLAG \ -DOpenMP_C_FLAGS="-Xpreprocessor -fopenmp -I$HOMEBREW_PREFIX/opt/libomp/include" \ -DOpenMP_CXX_FLAGS="-Xpreprocessor -fopenmp -I$HOMEBREW_PREFIX/opt/libomp/include" \ @@ -144,7 +163,7 @@ jobs: if [ -f "${{ steps.paths.outputs.ext_deps_dir }}/netcdf-c/install/netcdf-c/bin/libz.dylib" ]; then ln -sf libz.dylib ${{ steps.paths.outputs.ext_deps_dir }}/netcdf-c/install/netcdf-c/bin/libz.1.dylib fi - + export DYLD_LIBRARY_PATH="${{ steps.paths.outputs.ext_deps_dir }}/netcdf-c/install/netcdf-c/bin:$DYLD_LIBRARY_PATH" ctest --test-dir ${{ steps.paths.outputs.build_dir }} \ -C ${{ inputs.build_type }} \ diff --git a/cmake/compiler_config.cmake b/cmake/compiler_config.cmake index ad5a12ff5..580bf54cd 100644 --- a/cmake/compiler_config.cmake +++ b/cmake/compiler_config.cmake @@ -15,6 +15,13 @@ if(APPLE) message(STATUS "Configuring build for macOS with ${CMAKE_CXX_COMPILER_ID} (${CMAKE_CXX_COMPILER_VERSION}).") # Common warning and visibility flags add_compile_options("-fvisibility=hidden;-Wall;-Wextra;-pedantic;-Werror;-Wno-unused-function") + + cmake_host_system_information(RESULT os_release QUERY OS_RELEASE) + + if(os_release VERSION_GREATER_EQUAL "26.0") + add_compile_options("-Wno-character-conversion") + endif() + # Conditionally suppress unused parameter warnings (used for platform-specific compiler issues) if(SUPPRESS_UNUSED_PARAMETER_WARNING) add_compile_options("-Wno-unused-parameter") @@ -25,6 +32,8 @@ if(APPLE) # Optimization / debug flags add_compile_options("$<$:-O2>") add_compile_options("$<$:-g>") + # Disable warnings about implicit conversions between character types + # This is required because of a compatibility issue between clang++ and googletest else() message(FATAL_ERROR "Unsupported compiler on macOS. Supported: AppleClang/Clang. Found ${CMAKE_CXX_COMPILER_ID}.") endif() diff --git a/data/test/data/northbank_001b.pol b/data/test/data/northbank_001b.pol new file mode 100755 index 000000000..15ffcfe48 --- /dev/null +++ b/data/test/data/northbank_001b.pol @@ -0,0 +1,235 @@ +* +* Deltares, RGFGRID Version 7.03.00.77422 (Win64), Nov 30 2022, 15:52:41 +* File creation date: 2025-12-01, 21:04:21 +* +* Coordinate System = Cartesian +* +L000001 + 227 2 + 4.8269651E+04 4.1104092E+05 + 4.8309201E+04 4.1101690E+05 + 4.8348617E+04 4.1099271E+05 + 4.8387901E+04 4.1096835E+05 + 4.8427367E+04 4.1094396E+05 + 4.8465908E+04 4.1091938E+05 + 4.8503840E+04 4.1089477E+05 + 4.8541162E+04 4.1087013E+05 + 4.8578186E+04 4.1084545E+05 + 4.8614778E+04 4.1082038E+05 + 4.8651248E+04 4.1079491E+05 + 4.8687598E+04 4.1076905E+05 + 4.8724086E+04 4.1074251E+05 + 4.8758623E+04 4.1071678E+05 + 4.8791471E+04 4.1069159E+05 + 4.8822627E+04 4.1066693E+05 + 4.8852209E+04 4.1064235E+05 + 4.8881096E+04 4.1061850E+05 + 4.8909403E+04 4.1059494E+05 + 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SepranTransform.cpp + SepranTopology.cpp + SepranFront.cpp + SepranQuadratic.cpp + Msho2d.cpp + Mshoce.cpp +) + +target_sources(${target_name} PRIVATE ${TARGET_SRC_LIST}) + +target_include_directories(${target_name} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}) + +target_compile_features(${target_name} PUBLIC cxx_std_20) + +set_target_properties( + ${target_name} + PROPERTIES + POSITION_INDEPENDENT_CODE ON +) + +source_group("Source Files" FILES ${TARGET_SRC_LIST}) \ No newline at end of file diff --git a/extern/sepran/Msho2d.cpp b/extern/sepran/Msho2d.cpp new file mode 100644 index 000000000..039839941 --- /dev/null +++ b/extern/sepran/Msho2d.cpp @@ -0,0 +1,1050 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of msho2d.for from the SEPRAN library +// ("Ingenieursbureau SEPRA", Niek Praagman, 1989-2011). +// +// TRANSLATION CONVENTIONS (flat-span layout): +// coor : coor[2*(k-1)] = x, coor[2*(k-1)+1] = y (1-based k) +// kstapl : kstapl[2*s]=n1, kstapl[2*s+1]=n2 (0-based s) +// kmeshc : kmeshc[3*e], [3*e+1], [3*e+2] (0-based e, 1-based node values) +// itri : itri[k-1] (1-based k) +// boundary: boundary[2*i]=curveNr, boundary[2*i+1]=startAddr (0-based i) +// kbound : kbound[2*e]=n1, kbound[2*e+1]=n2 (0-based e, 1-based node values) + +#include "Msho2d.hpp" + +#include "SepranBoundary.hpp" +#include "SepranCurveIntersection.hpp" +#include "SepranFront.hpp" +#include "SepranGeometry.hpp" +#include "SepranSort.hpp" +#include "SepranTopology.hpp" +#include "SepranTransform.hpp" + +#include +#include +#include +#include +#include +#include + +namespace sepran +{ + +void msho2d(std::span coor, + int& npoint, + std::span kbound, + int nbound, + std::span kmeshc, + int& nelem, + std::span boundary, + int numcrvboun, + int npunt, + int inside, + std::span holeinfo, + int nholes, + bool reposition, + std::span kbndpt_in, + int nbndpt_in, + std::span coar, + int ncoar, + std::span userpoints, + std::span cocurv, + int ncurvs, + std::span curves, + std::span crvnrs, + int istep, + std::span extquanodes, + int isurnr, + std::span rinput, + int nuspnt, + int ndim, + SepranContext& ctx) +{ + (void)crvnrs; + + // --- Allocate local work arrays + const int maxPts = npunt + 20; + const int maxKstap = 10 * maxPts + 20; + + std::vector chelp (maxPts, 0.0); + std::vector icube (maxPts, 0); + std::vector itriArr (maxPts, 0); + std::vector kstaplArr(maxKstap, 0); + + // mutable kbndpt (may be extended by msho36) + std::vector kbndptArr(kbndpt_in.begin(), kbndpt_in.end()); + kbndptArr.resize(maxPts + 2, 0); + int nbndpt = nbndpt_in; + + // Alias spans for helpers + auto kstaplSp = std::span(kstaplArr); + auto kbndptSp = std::span(kbndptArr); + auto itri = std::span(itriArr); + auto chelpSp = std::span(chelp); + auto icubeSp = std::span(icube); + + // --- Fill userco and coaval from rinput + std::vector userco(2 * nuspnt, 0.0); + std::vector coaval(2 + nuspnt, 0.0); + + for (int i = 1; i <= nuspnt; ++i) + { + userco[2*(i-1)] = rinput[1 + ndim*i]; // rinput(1+ndim*i) + userco[2*(i-1)+1] = rinput[2 + ndim*i]; // rinput(2+ndim*i) + } + + // jcoars = 0 (AvD: no coarseness from rinput by default) + coaval[0] = 1.0; + + // --- Transform all nodes into the unit first-quadrant + double xmint = 0.0, ymint = 0.0, tran = 1.0; + { + const int totalCurvNodes = [&](){ + int s = 0; for (int i = 0; i < ncurvs; ++i) s += curves[i]; return s; + }(); + // transform2DSurface needs mutable coar/cocurv/userco – convert to mutable + std::vector coarMut(coar.begin(), coar.end()); + std::vector cocurvMut(cocurv.begin(), cocurv.end()); + std::vector usercoMut(userco.begin(), userco.end()); + TransformParams tp = transform2DSurface( + coor, npoint, + std::span(coarMut), ncoar, + curves, ncurvs, + std::span(cocurvMut), + std::span(usercoMut), + nuspnt, + ctx); + xmint = tp.xmint; ymint = tp.ymint; tran = tp.tran; + (void)totalCurvNodes; + } + if (ctx.ierror != 0) return; + + // --- Compute boundary coarsenesses + double coarsemin = 0.0, coarsemax = 0.0; + // msho01 expects mutable coar + std::vector coarMsho01(coar.begin(), coar.end()); + msho01(kbound, nbound, itri, kstaplSp, chelpSp, coor, npoint, + coarsemin, coarsemax, std::span(coarMsho01), ncoar, ctx); + if (ctx.ierror != 0) return; + + // --- Check boundary self-intersections + boundarySelfIntersectionCheck(kbound, nbound, coor, isurnr, ctx); + if (ctx.ierror != 0) return; + + // --- Build initial kstapl from kbound + int kstap = nbound; + for (int i = 0; i < 2 * nbound; ++i) + kstaplArr[i] = kbound[i]; + + // --- Number of initial boundary nodes (before internal curves) + int nipnt = npoint; + + // --- Add internal curve nodes + if (ncurvs > 0) + { + // coaval[0] already set; cast const away for coarse param (will be updated) + std::vector coarseArr(chelpSp.begin(), chelpSp.end()); + + msho36(coor, npoint, istep, ncurvs, curves, cocurv, + kstaplSp, kstap, + kbndptSp, nbndpt, + coarsemin, + extquanodes, + std::span(coarseArr), + ctx); + + // Copy updated coarsenesses back + std::copy(coarseArr.begin(), coarseArr.end(), chelp.begin()); + + if (ctx.ierror != 0) return; + + // Re-check intersections + boundarySelfIntersectionCheck(kstaplSp.subspan(0, 2 * kstap), kstap, coor, isurnr, ctx); + if (ctx.ierror != 0) return; + } + + // --- Save all boundary pieces for later (kinbnd) + const int lenbnd = 2 * kstap; + std::vector kinbnd(kstaplArr.begin(), kstaplArr.begin() + lenbnd); + + // --- Multiplication factor for search window + (void)std::max(1, static_cast( + std::round(std::log10(std::max(coarsemax / coarsemin, 1.0 + ctx.epsmac))))); + + // --- Bounding box + double xminloc, xmaxloc, yminloc, ymaxloc; + msho04(coor, npoint, xminloc, xmaxloc, yminloc, ymaxloc, ctx); + if (ctx.ierror != 0) return; + + // --- Min/max coarsenesses (boundary nodes only) + double dismin, dismax; + msho05(chelpSp, nipnt, dismin, dismax, ctx); + if (ctx.ierror != 0) return; + + // --- Grid dimensions + const double dism = (dismax + 2.0 * dismin) / 3.0; + const int nx = static_cast((xmaxloc - xminloc) / (0.9998 * dism)) + 1; + const int ny = static_cast((ymaxloc - yminloc) / (0.9998 * dism)) + 1; + const int ncube = nx * ny; + + std::vector jcube(ncube, 0); + std::vector cubeArr(ncube, 0.0); + + double xstart = (xmaxloc + xminloc - nx * dism) / 2.0 + dism / 12.0; + double ystart = (ymaxloc + yminloc - ny * dism) / 2.0 + dism / 12.0; + + // --- Build coarseness grid + msho06(npoint, coor, dism, xstart, ystart, nx, ny, + icubeSp, chelpSp, + std::span(cubeArr), std::span(jcube), + kbound, nbound, + coar, ncoar, + ncurvs, curves, cocurv, + ctx); + + // --- Coarseness smoothness check + if (ndim == 2 && coaval[nuspnt + 1] > 1.0) + { + msho38(npoint, coor, dism, xstart, ystart, + kbndptSp, nbndpt, + numcrvboun, boundary, + nbound, nholes, + nx, ny, + icubeSp, + chelpSp, + std::span(cubeArr), + std::span(jcube), + kstaplSp, kstap, + ncurvs, curves, cocurv, + isurnr, + std::span(userco), + nuspnt, + std::span(coaval), + tran, + ctx); + } + if (ctx.ierror != 0) return; + + // --- Compute reference area values per cube cell + // Reuse chelp (now sized ncube) + chelp.assign(ncube, 0.0); + msho21(std::span(cubeArr), ncube, chelpSp); + if (ctx.ierror != 0) return; + + // --- After msho21, nipnt covers all initial+internal-curve points + nipnt = npoint; + + // --- Clear itri + for (auto& v : itriArr) v = 0; + + // --- Fill itri from current kstapl + for (int i = 0; i < 2 * kstap; ++i) + itriArr[kstaplArr[i] - 1]++; // 1-based node + + nelem = 0; + int nelemi = 0; // number of elements from special nodes + + // --- Place special coarseness-point nodes and elements + double coarmin = coarsemin; + if (ncoar > 0) + { + msho35(npoint, coor, xstart, ystart, dism, + coar, ncoar, icubeSp, nx, + kmeshc, nelem, + kstaplSp, kstap, + itri, + isurnr, userpoints, + kbndptSp, nbndpt, + ctx); + if (ctx.ierror != 0) return; + + nipnt += 7 * ncoar; + nelemi = nelem; + + for (int i = 0; i < ncoar; ++i) + if (coar[3*i+2] < coarmin) coarmin = coar[3*i+2]; + } + + // --- Orient front edges + msho08(kstaplSp, kstap, coor, xstart, dismin, + holeinfo, nholes, false, ctx); + if (ctx.ierror != 0) return; + + // ------------------------------------------------------------------- + // Main advancing-front loop + // ------------------------------------------------------------------- + int nochan = 0; + int nherha = 0; + int iperm = 0; + + // Temporaries for best-mesh bookkeeping + int npntmp = 0, neltmp = 0; + int npndef = 0, neldef = 0; + double ratiop = ctx.rinfin; + std::vector coortmp; + std::vector meshtmp; + bool firstSolution = true; + + const double eps = 10.0 * ctx.epsmac; + + // Helper: compute quality ratio for mesh comparison + auto computeDismin = [&]() -> double + { + double dmin = ctx.rinfin; + for (int ie = 0; ie < nelem; ++ie) + { + const int a = kmeshc[3*ie], b = kmeshc[3*ie+1], c = kmeshc[3*ie+2]; + double ratio; + msho33(coor, ratio, a, b, c); + double surf; + surf = triangleArea(coor, a, b, c); + if (surf < 0.0) ratio = -ratio; + dmin = std::min(ratio, dmin); + } + return dmin; + }; + + // ---- label 300: main iteration ---- + int dbg_newNode = 0, dbg_useExist = 0, dbg_kdrie = 0, dbg_skip = 0; + int dbg_jpnFoundTooFar = 0, dbg_jpnNotFound = 0; + auto advanceFront = [&]() -> bool // returns false when done or error + { + const int nrepos = 10 * npunt + 20; + + // Local iwork/ibuurp for msho16 & msho29 + std::vector iworkArr(maxPts, 0); + std::vector ibuurpArr(nrepos, 0); + + for (;;) // loop equivalent to Fortran "goto 300" + { + // ---- section 300 ---- + int ichan; + if (nochan < kstap - 1) + ichan = std::min(25, kstap - nochan - 1); + else + ichan = 0; + + if (npoint > npunt) + { + ctx.ierror = 1; + throw std::runtime_error( + "msho2d: npunt=" + std::to_string(npunt) + + " exceeded (npoint=" + std::to_string(npoint) + ") (error 900)"); + } + + if (nelem > 2000000) + { + ctx.ierror = 1; + throw std::runtime_error("msho2d: element array too small (error 901)"); + } + + if (nochan > 3 * kstap) + { + ctx.ierror = 1; + throw std::runtime_error( + "msho2d: no convergence, nochan=" + std::to_string(nochan) + + ", kstap=" + std::to_string(kstap) + " (error 902)"); + } + + if (kstap == 0) return true; // done + + if (ichan > 0) + msho25(kstaplSp, ichan, coor, ctx); + + double angle = -0.1; + [[maybe_unused]] double factor = 1.0; + + if (nochan > 10 || nochan > kstap) { angle = -0.7; factor = 0.6; } + if (nochan > 2 * kstap) { angle = -0.95; factor = 0.5; } + + // ---- pick base edge ---- + const int i1 = kstaplArr[0]; + const int i2 = kstaplArr[1]; + + itriArr[i1 - 1]--; + itriArr[i2 - 1]--; + + // ---- find neighbouring front edges ---- + int iex1, iex2; + double angle1, angle2; + msho12(coor, kstaplSp, kstap, i1, i2, iex1, iex2, angle1, angle2, ctx); + if (ctx.ierror != 0) return false; + + // ---- kstap==4 / "difficult combination" special case (msho2d.for ~1092-1117) ---- + { + int ja = 0; + if (nochan > kstap && kstap > 4) + { + int j1 = 0, j2 = 0; + double e1loc = 0.0, e2loc = 0.0; + msho12(coor, kstaplSp, kstap, iex1, i1, j1, j2, e1loc, e2loc, ctx); + if (ctx.ierror != 0) return false; + if (j1 == iex2) ja = 1; + } + + if (kstap == 4 || ja == 1) + { + const double s1 = triangleArea(coor, iex1, i1, i2); + const double s2 = triangleArea(coor, i2, iex2, iex1); + + if (s1 < 0.0 || s2 < 0.0) + { + const double stmp = triangleArea(coor, i1, i2, iex2); + if (stmp > 0.0) + { + addElement(kmeshc, nelem, i1, i2, iex2, kstaplSp, kstap, itri); + nochan = 0; + continue; + } + } + } + } + + const double surfInf = ctx.rinfin; + + // ---- iex1==iex2? ---- + int ipotn1 = 0, ipotn2 = 0; + double surf1 = 0.0, surf2 = 0.0; + double xnLocal = 0.0, ynLocal = 0.0; + + if (iex1 == iex2) + { + double surf; + surf = triangleArea(coor, i1, i2, iex1); + iperm = 0; + if (inside == 1) + msho28(coor, i1, i2, iex1, xnLocal, ynLocal, npoint, itri, iperm, ctx); + + if (surf >= 0.0 && iperm == 0) + { + addElement(kmeshc, nelem, i1, i2, iex1, kstaplSp, kstap, itri); + nochan = 0; continue; + } + if (surf <= 0.0 && kstap == 3) + { + addElement(kmeshc, nelem, i1, i2, iex1, kstaplSp, kstap, itri); + nochan = 0; continue; + } + } + + // ---- check angles ---- + surf1 = triangleArea(coor, i1, i2, iex1); + if (surf1 < eps) { angle1 = -1.0; ipotn1 = 1; } else ipotn1 = 0; + surf2 = triangleArea(coor, i1, i2, iex2); + if (surf2 < eps) { angle2 = -1.0; ipotn2 = 1; } else ipotn2 = 0; + + if (angle1 > angle && angle2 >= angle1) + { + double angleh; + msho11(i1, iex1, iex2, coor, angleh, ctx); + if (angleh < -0.5) + { + // try i1-i2-iex1 + double stest = triangleArea(coor, i2, iex2, iex1); + int ja = (stest >= 100.0 * eps) ? 1 : 0; + iperm = 0; + if (ja == 1) msho28(coor, i1, i2, iex1, xnLocal, ynLocal, npoint, itri, iperm, ctx); + if (ja == 1 && iperm == 0) + { + int icheck; + msho24(kstaplSp, kstap, coor, i2, iex1, icheck, ctx); + if (icheck == 0) + { addElement(kmeshc, nelem, i1, i2, iex1, kstaplSp, kstap, itri); nochan=0; continue; } + } + else surf1 = surfInf; + } + else + { + // try i1-i2-iex2 + double stest = triangleArea(coor, i1, i2, iex2); + int ja = (stest >= 100.0 * eps) ? 1 : 0; + iperm = 0; + if (ja == 1) msho28(coor, i1, i2, iex2, xnLocal, ynLocal, npoint, itri, iperm, ctx); + if (ja == 1 && iperm == 0) + { + int icheck; + msho24(kstaplSp, kstap, coor, i1, iex2, icheck, ctx); + if (icheck == 0) + { addElement(kmeshc, nelem, i1, i2, iex2, kstaplSp, kstap, itri); nochan=0; continue; } + } + else surf2 = surfInf; + } + } + if (ctx.ierror != 0) return false; + if (surf1 < eps) surf1 = surfInf; + + if (angle2 > angle && angle1 >= angle2) + { + double angleh; + msho11(i2, iex2, iex1, coor, angleh, ctx); + if (angleh < -0.5) + { + // try i1-i2-iex2 + double stest = triangleArea(coor, i1, iex2, iex1); + int ja = (stest >= 100.0 * eps) ? 1 : 0; + iperm = 0; + if (ja == 1) msho28(coor, i1, i2, iex2, xnLocal, ynLocal, npoint, itri, iperm, ctx); + if (ja == 1 && iperm == 0) + { + int icheck; + msho24(kstaplSp, kstap, coor, i1, iex2, icheck, ctx); + if (icheck == 0) + { addElement(kmeshc, nelem, i1, i2, iex2, kstaplSp, kstap, itri); nochan=0; continue; } + } + else surf2 = surfInf; + } + else + { + // try i1-i2-iex1 + double stest = triangleArea(coor, i1, i2, iex1); + int ja = (stest >= 100.0 * eps) ? 1 : 0; + iperm = 0; + if (ja == 1) msho28(coor, i1, i2, iex1, xnLocal, ynLocal, npoint, itri, iperm, ctx); + if (ja == 1 && iperm == 0) + { + int icheck; + msho24(kstaplSp, kstap, coor, i2, iex1, icheck, ctx); + if (icheck == 0) + { addElement(kmeshc, nelem, i1, i2, iex1, kstaplSp, kstap, itri); nochan=0; continue; } + } + else surf1 = surfInf; + } + } + if (ctx.ierror != 0) return false; + if (surf2 < eps) surf2 = surfInf; + + // ---- midpoint + normal ---- + double e1, e2, xm, ym; + msho09(coor, i1, i2, e1, e2, xm, ym); + + const double dx = coor[2*(i2-1)] - coor[2*(i1-1)]; + const double dy = coor[2*(i2-1)+1] - coor[2*(i1-1)+1]; + double disold = std::sqrt(dx*dx + dy*dy); + + const int ic1 = icubeSp[i1-1]; + const int ic2 = icubeSp[i2-1]; + // Initial coarseness estimate (Fortran: coa = (cube(icube(i1))+cube(icube(i2)))/2) + double coa = ((ic1 >= 1 && ic1 <= ncube ? cubeArr[ic1-1] : dismin) + + (ic2 >= 1 && ic2 <= ncube ? cubeArr[ic2-1] : dismin)) / 2.0; + // Fortran: disold = (disold + 2*coa)/3 — modifies disold as weighted average + disold = (disold + 2.0 * coa) / 3.0; + + double xnNew = xm + 0.95 * disold * e1; + double ynNew = ym + 0.95 * disold * e2; + + int n1c = static_cast((xnNew - xstart) / dism); + int n2c = static_cast((ynNew - ystart) / dism); + n1c = std::clamp(n1c, 0, nx - 1); + n2c = std::clamp(n2c, 0, ny - 1); + const int nc = 1 + n1c + n2c * nx; + + const double cdis = (nc >= 1 && nc <= ncube) ? cubeArr[nc-1] : dismin; + + // Fortran: computes xnx/yny after reassigning coa = (disold+2*cdis)/3. + // (Saving pre-reassignment coa as coaInit gives closer match to Fortran output.) + const double coaInit = coa; + // Reassign coa for front-point estimate + coa = (disold + 2.0 * cdis) / 3.0; + xnNew = xm + coa * e1; + ynNew = ym + coa * e2; + + double xnxLocal, ynyLocal; + if (cdis > 1.2 * disold) { xnxLocal = xm + coaInit*e1; ynyLocal = ym + coaInit*e2; } + else if (cdis < 0.8*disold) { xnxLocal = xm + 0.7*coaInit*e1; ynyLocal = ym + 0.7*coaInit*e2; } + else { xnxLocal = xm + 0.85*coaInit*e1; ynyLocal = ym + 0.85*coaInit*e2; } + + int ja = 0; + msho07(xnNew, ynNew, xstart, coor, kstaplSp.subspan(0, 2*kstap), kstap, ja, ctx); + if (ctx.ierror != 0) return false; + + int kdrie = 0; + msho13(coor, i1, i2, kdrie, kstaplSp, kstap, xnNew, ynNew, ctx); + + if (kdrie == -1) + { msho20(kstaplSp, kstap, itri); nochan++; continue; } + if (ctx.ierror != 0) return false; + + if (ja == 0 && kdrie == 0) + { + // try a small offset + xnNew += -dismin * 1e-3 + dismin * 1e-4; + ynNew += dismin * 1e-3 + dismin * 1e-4; + ja = 0; + msho07(xnNew, ynNew, xstart, coor, kstaplSp.subspan(0, 2*kstap), kstap, ja, ctx); + msho13(coor, i1, i2, kdrie, kstaplSp, kstap, xnNew, ynNew, ctx); + if ((ja == 0 && kdrie == 0) || kdrie == -1) + { msho20(kstaplSp, kstap, itri); nochan++; continue; } + } + if (ctx.ierror != 0) return false; + + // ---- loop 420: use existing front point ---- + while (kdrie > 0) + { + const int ii1 = kstaplArr[2*(kdrie-1)]; + const int ii2 = kstaplArr[2*(kdrie-1)+1]; + + int jpn = 0; + + if (ii1 == i2 && surf2 < surfInf / 2.0) + { + double stest = triangleArea(coor, i1, iex1, ii2); + if (stest < -eps || ipotn1 == 1) + { + int icheck; + msho24(kstaplSp, kstap, coor, i1, ii2, icheck, ctx); + double sf = triangleArea(coor, i1, i2, ii2); + if (icheck == 0 && sf > eps) + { addElement(kmeshc, nelem, i1, i2, ii2, kstaplSp, kstap, itri); nochan=0; goto next300; } + else if (icheck > 0) { kdrie = icheck; continue; } + } + } + + if (ii2 == i1 && surf1 < surfInf / 2.0) + { + double stest = triangleArea(coor, i2, ii1, iex2); + if (stest < -eps || ipotn2 == 1) + { + int icheck; + msho24(kstaplSp, kstap, coor, i2, ii1, icheck, ctx); + double sf = triangleArea(coor, i1, i2, ii1); + if (icheck == 0 && sf > eps) + { addElement(kmeshc, nelem, i1, i2, ii1, kstaplSp, kstap, itri); nochan=0; goto next300; } + else if (icheck > 0) { kdrie = icheck; continue; } + } + } + + if (ctx.ierror != 0) return false; + + if (i2 != ii1 && i1 != ii2) + { + // pick closer of ii1, ii2 + const double dx1 = xnxLocal - coor[2*(ii1-1)], dy1 = ynyLocal - coor[2*(ii1-1)+1]; + const double dx2 = xnxLocal - coor[2*(ii2-1)], dy2 = ynyLocal - coor[2*(ii2-1)+1]; + double dist1 = std::sqrt(dx1*dx1 + dy1*dy1); + double dist = std::sqrt(dx2*dx2 + dy2*dy2); + jpn = (dist < dist1) ? ii2 : ii1; + + // visibility check + int no = 0; + { int ic; msho24(kstaplSp, kstap, coor, i1, jpn, ic, ctx); if (ic != 0) no = 1; } + { int ic; msho24(kstaplSp, kstap, coor, i2, jpn, ic, ctx); if (ic != 0) no = 1; } + if (no) jpn = 0; + + if (jpn != 0 && jpn != iex1 && ipotn1 == 0 && nochan < kstap) + { + double sf = triangleArea(coor, iex1, i1, jpn); + double va = ic1 >= 1 && ic1 <= ncube ? chelp[ic1-1] : 0.0; + if (sf < 0.15 * va) { msho20(kstaplSp, kstap, itri); nochan++; goto next300; } + } + if (jpn != 0 && jpn != iex2 && ipotn2 == 0 && nochan < kstap) + { + double sf = triangleArea(coor, i2, iex2, jpn); + double va = ic2 >= 1 && ic2 <= ncube ? chelp[ic2-1] : 0.0; + if (sf < 0.15 * va) { msho20(kstaplSp, kstap, itri); nochan++; goto next300; } + } + } + + if (jpn > 0) + { + double sf = triangleArea(coor, i1, i2, jpn); + const double va = ((ic1 >= 1 && ic1 <= ncube ? chelp[ic1-1] : 0.0) + + (ic2 >= 1 && ic2 <= ncube ? chelp[ic2-1] : 0.0)) / 2.0; + if ((nochan < kstap && sf < 0.01 * va) || sf < 10.0 * eps) jpn = 0; + if (jpn == iex1 && surf1 > surfInf / 2.0) jpn = 0; + if (jpn == iex2 && surf2 > surfInf / 2.0) jpn = 0; + } + + iperm = 0; + if (jpn > 0) msho28(coor, i1, i2, jpn, xnLocal, ynLocal, npoint, itri, iperm, ctx); + if (iperm == 1) jpn = 0; + + if (jpn > 0) + { ++dbg_kdrie; addElement(kmeshc, nelem, i1, i2, jpn, kstaplSp, kstap, itri); nochan = 0; goto next300; } + else + { ++dbg_skip; msho20(kstaplSp, kstap, itri); nochan++; goto next300; } + } + + // ---- kdrie==0: try to use nearby node or create new one ---- + { + int jpn = 0; + double dista = 2.0 * coa; + msho14(coor, jpn, npoint, itri, i1, i2, xnxLocal, ynyLocal, dista); + if (dista > 0.55 * coa) { if (jpn > 0) ++dbg_jpnFoundTooFar; else ++dbg_jpnNotFound; jpn = 0; } + + iperm = 0; + if (jpn != 0 && inside == 1) + msho28(coor, i1, i2, jpn, xnLocal, ynLocal, npoint, itri, iperm, ctx); + if (iperm == 1) { msho20(kstaplSp, kstap, itri); nochan++; continue; } + + if (jpn != 0 && jpn != iex1 && ipotn1 == 0) + { + double sf = triangleArea(coor, iex1, i1, jpn); + double va = ic1 >= 1 && ic1 <= ncube ? chelp[ic1-1] : 0.0; + if (sf < 0.15 * va) { msho20(kstaplSp, kstap, itri); nochan++; continue; } + } + if (jpn != 0 && jpn != iex2 && ipotn2 == 0) + { + double sf = triangleArea(coor, i2, iex2, jpn); + double va = ic2 >= 1 && ic2 <= ncube ? chelp[ic2-1] : 0.0; + if (sf < 0.15 * va) { msho20(kstaplSp, kstap, itri); nochan++; continue; } + } + + int inear = 0, no = 0; + if (dista < 0.55 * coa) + { + inear = 1; + int ic; msho24(kstaplSp, kstap, coor, i1, jpn, ic, ctx); if (ic) no = 1; + msho24(kstaplSp, kstap, coor, i2, jpn, ic, ctx); if (ic) no = 1; + } + + int useJpn = 0; + if (jpn != 0) + { + double sf = triangleArea(coor, i1, i2, jpn); + double va = ((ic1 >= 1 && ic1 <= ncube ? chelp[ic1-1] : 0.0) + + (ic2 >= 1 && ic2 <= ncube ? chelp[ic2-1] : 0.0)) / 2.0; + useJpn = (!(nochan < kstap && sf < 0.02 * va) && sf >= 10.0 * eps) ? 1 : 0; + } + if (no) useJpn = 0; + + if (useJpn == 0) dista = surfInf; + + if (dista < 0.55 * coa) + { + ++dbg_useExist; + addElement(kmeshc, nelem, i1, i2, jpn, kstaplSp, kstap, itri); + nochan = 0; + } + else if (inear == 0) + { + // new point + ++dbg_newNode; + msho15(coor, npoint, kmeshc, nelem, kstaplSp, kstap, itri, + i1, i2, xnxLocal, ynyLocal); + nochan = 0; + + n1c = static_cast((xnxLocal - xstart) / dism); + n2c = static_cast((ynyLocal - ystart) / dism); + n1c = std::clamp(n1c, 0, nx - 1); + n2c = std::clamp(n2c, 0, ny - 1); + icubeSp[npoint - 1] = 1 + n1c + n2c * nx; + } + else + { + msho20(kstaplSp, kstap, itri); nochan++; + } + } + + next300: + if (ctx.ierror != 0) return false; + // loop + } + + return true; // kstap == 0 + }; + + bool done = advanceFront(); + if (!done || ctx.ierror != 0) return; + + auto verifyConnectionsArray = [&]() + { + int itot = 0; + for (int i = 0; i < npoint; ++i) itot += std::abs(itriArr[i]); + if (itot != 0) + { + ctx.ierror = 1; + throw std::runtime_error("msho2d: connections array error (error 903)"); + } + }; + + // ---- label 500: check itri ---- + verifyConnectionsArray(); + + // ---- Save first solution ---- + if (firstSolution) + { + firstSolution = false; + npndef = npoint + 5 + npoint / 10; + npntmp = npoint; + neldef = nelem + 5 + nelem / 10; + neltmp = nelem; + + coortmp.resize(2 * npndef); + meshtmp.resize(3 * neldef); + for (int i = 0; i < npoint; ++i) + { coortmp[2*i] = coor[2*i]; coortmp[2*i+1] = coor[2*i+1]; } + for (int i = 0; i < nelem; ++i) + { meshtmp[3*i]=kmeshc[3*i]; meshtmp[3*i+1]=kmeshc[3*i+1]; meshtmp[3*i+2]=kmeshc[3*i+2]; } + ratiop = computeDismin(); + } + + // ---- label 540: post-processing loop (matches Fortran structure) ---- + // Each iteration: 3x (msho16 + msho29 compact), diagonal improvement, + // compare/save, repositioning (msho16). Repeat until nherha>=5 and ja==0 and ifill==0. + const int nrepos = 10 * npunt + 20; + std::vector iworkPost(maxPts, 0); + std::vector ibuurpPost(nrepos, 0); + + auto compactMesh = [&]() + { + for (int i = 0; i < npoint; ++i) itriArr[i] = 0; + for (int i = 0; i < nelem; ++i) + { itriArr[kmeshc[3*i]-1]=1; itriArr[kmeshc[3*i+1]-1]=1; itriArr[kmeshc[3*i+2]-1]=1; } + int itot = 0; + for (int i = 0; i < npoint; ++i) + { + if (itriArr[i] == 1 || i < nipnt) + { + ++itot; + coor[2*(itot-1)] = coor[2*i]; + coor[2*(itot-1)+1] = coor[2*i+1]; + itriArr[i] = itot; + } + } + npoint = itot; + for (int i = 0; i < nelem; ++i) + { + kmeshc[3*i] = itriArr[kmeshc[3*i]-1]; + kmeshc[3*i+1] = itriArr[kmeshc[3*i+1]-1]; + kmeshc[3*i+2] = itriArr[kmeshc[3*i+2]-1]; + } + }; + + int ifill = 0; + while (true) // label 540 + { + // Inner loop: 3 × (msho16 + msho29 + compact) + for (int ih = 0; ih < 3; ++ih) + { + int leng = nrepos; + msho16(kmeshc, nelem, npoint, nipnt, iworkPost, ibuurpPost, leng, ctx); + if (leng > nrepos) + { ctx.ierror = 1; throw std::runtime_error("msho2d: repositioning array too small (error 903)"); } + if (ctx.ierror != 0) return; + + int icancel = 0; + msho29(kmeshc, nelem, npoint, iworkPost, ibuurpPost, nipnt, coor, icancel); + if (ctx.ierror != 0) return; + compactMesh(); + } + + // Diagonal improvement + ifill = 0; + for (int ielem = nelemi; ielem < nelem; ++ielem) + { + int i1 = kmeshc[3*ielem], i2 = kmeshc[3*ielem+1], i3 = kmeshc[3*ielem+2]; + double adis = nodeDistance(i1, i2, coor); + double bdis = nodeDistance(i2, i3, coor); + double cdis2 = nodeDistance(i3, i1, coor); + const int icase = checkTriangleAngles(adis, bdis, cdis2); + + if (icase > 0) + { + int jelem = ielem; + int i4 = 0; + int j1 = i1, j2 = i2, j3 = i3, j4 = 0; + + if (icase == 1) + { + msho26(kmeshc, nelem, i2, i3, jelem, i4); + int ja = 0; msho42(std::span(kinbnd), lenbnd, i2, i3, ja); + if (ja) i4 = 0; + if (i4 > 0 && jelem != ielem) + { + j1 = i1; + msho27(coor, i1, i2, i3, i4, ctx); + if (j1 != i1) ifill = 1; + j1=i1; j2=i2; j3=i3; j4=i4; + kmeshc[3*ielem]=j1; kmeshc[3*ielem+1]=j2; kmeshc[3*ielem+2]=j3; + kmeshc[3*jelem]=j2; kmeshc[3*jelem+1]=j4; kmeshc[3*jelem+2]=j3; + } + } + else if (icase == 2) + { + msho26(kmeshc, nelem, i3, i1, jelem, i4); + int ja = 0; msho42(std::span(kinbnd), lenbnd, i3, i1, ja); + if (ja) i4 = 0; + if (i4 > 0 && jelem != ielem) + { + j2 = i2; + msho27(coor, i2, i3, i1, i4, ctx); + if (j2 != i2) ifill = 1; + j1=i2; j2=i3; j3=i1; j4=i4; + kmeshc[3*ielem]=j1; kmeshc[3*ielem+1]=j2; kmeshc[3*ielem+2]=j3; + kmeshc[3*jelem]=j2; kmeshc[3*jelem+1]=j4; kmeshc[3*jelem+2]=j3; + } + } + else if (icase == 3) + { + msho26(kmeshc, nelem, i1, i2, jelem, i4); + int ja = 0; msho42(std::span(kinbnd), lenbnd, i1, i2, ja); + if (ja) i4 = 0; + if (i4 > 0 && jelem != ielem) + { + j3 = i3; + msho27(coor, i3, i1, i2, i4, ctx); + if (j3 != i3) ifill = 1; + j1=i3; j2=i1; j3=i2; j4=i4; + kmeshc[3*ielem]=j1; kmeshc[3*ielem+1]=j2; kmeshc[3*ielem+2]=j3; + kmeshc[3*jelem]=j2; kmeshc[3*jelem+1]=j4; kmeshc[3*jelem+2]=j3; + } + } + } + } + if (ctx.ierror != 0) return; + + // Compare and save if better + { + const double dmin = computeDismin(); + if (dmin > ratiop) + { + ratiop = dmin; npntmp = npoint; + coortmp.resize(2 * npntmp); + for (int i = 0; i < npoint; ++i) + { coortmp[2*i] = coor[2*i]; coortmp[2*i+1] = coor[2*i+1]; } + neltmp = nelem; + meshtmp.resize(3 * neltmp); + for (int i = 0; i < nelem; ++i) + { meshtmp[3*i]=kmeshc[3*i]; meshtmp[3*i+1]=kmeshc[3*i+1]; meshtmp[3*i+2]=kmeshc[3*i+2]; } + } + } + + // Check if convergence is too slow → go to label 900 + if ((reposition && (nherha > 10 && ifill == 0)) || nherha > 20) break; + + // Repositioning: increment nherha and call msho16 + // (msho18 Laplacian is commented out in the Fortran and not called) + ++nherha; + { + int leng = nrepos; + msho16(kmeshc, nelem, npoint, nipnt, iworkPost, ibuurpPost, leng, ctx); + if (ctx.ierror != 0) return; + } + + // Fortran redivision loop (msho30 + goto 300): if an interior + // triangle is invalid/too distorted, rebuild the local front and + // restart the advancing-front phase. + bool restartedFromRedivision = false; + for (int ielem = nelemi; ielem < nelem; ++ielem) + { + const int i1 = kmeshc[3 * ielem]; + const int i2 = kmeshc[3 * ielem + 1]; + const int i3 = kmeshc[3 * ielem + 2]; + + // Check only fully interior triangles. + if (i1 <= nipnt || i2 <= nipnt || i3 <= nipnt) + continue; + + const double surf = triangleArea(coor, i1, i2, i3); + + auto cubeIndexForNode = [&](int node) -> int + { + const int stored = icubeSp[node - 1]; + if (stored > 0) + { + const int idx = stored - 1; + if (idx >= 0 && idx < ncube) return idx; + } + + const double x = coor[2 * (node - 1)]; + const double y = coor[2 * (node - 1) + 1]; + int n1c = static_cast((x - xstart) / dism); + int n2c = static_cast((y - ystart) / dism); + n1c = std::clamp(n1c, 0, nx - 1); + n2c = std::clamp(n2c, 0, ny - 1); + return n1c + n2c * nx; + }; + + const int c1 = cubeIndexForNode(i1); + const int c2 = cubeIndexForNode(i2); + const int c3 = cubeIndexForNode(i3); + + const double valare = (chelp[c1] + chelp[c2] + chelp[c3]) / 3.0; + const bool areaOutOfRange = + ((surf < 0.1 * valare) || (surf > 10.0 * valare)) && (nherha < 50); + + if (surf < 0.0 || areaOutOfRange) + { + int ielemForMsho30 = ielem + 1; // msho30 is 1-based for ielem + msho30(kmeshc, nelem, ielemForMsho30, + kstaplSp, kstap, npoint, itri, + nelemi); + if (ctx.ierror != 0) return; + + nochan = 0; + done = advanceFront(); + if (!done || ctx.ierror != 0) return; + verifyConnectionsArray(); + + restartedFromRedivision = true; + break; + } + } + + if (restartedFromRedivision) + continue; + + // Check nodes with fewer than 5 neighbours (ja check) + int ja = 0; + for (int i = nipnt + 1; i <= npoint; ++i) + { + const int istart = (i == 1) ? 0 : iworkPost[i - 2]; + const int iend = iworkPost[i - 1]; + if (iend - istart < 5) { ja = 1; break; } + } + + // Repeat if nherha < 5, or any interior node has < 5 neighbours, or ifill + if (nherha < 5 || ja == 1 || ifill == 1) continue; // goto 540 + break; // goto 900 + } + + // ---- label 900: check final vs saved, pick best ---- + { + const double dmin = computeDismin(); + if (dmin < ratiop - 100.0 * eps && !coortmp.empty()) + { + // Use saved best mesh + npoint = npntmp; + for (int i = 0; i < npoint; ++i) + { coor[2*i] = coortmp[2*i]; coor[2*i+1] = coortmp[2*i+1]; } + nelem = neltmp; + for (int i = 0; i < nelem; ++i) + { kmeshc[3*i]=meshtmp[3*i]; kmeshc[3*i+1]=meshtmp[3*i+1]; kmeshc[3*i+2]=meshtmp[3*i+2]; } + } + } + + // ---- Back-transform coordinates ---- + for (int i = 0; i < npoint; ++i) + { + coor[2*i] = (coor[2*i] - 1.0) * tran + xmint; + coor[2*i+1] = (coor[2*i+1] - 1.0) * tran + ymint; + } +} + +} // namespace sepran diff --git a/extern/sepran/Msho2d.hpp b/extern/sepran/Msho2d.hpp new file mode 100644 index 000000000..cbc885c6b --- /dev/null +++ b/extern/sepran/Msho2d.hpp @@ -0,0 +1,103 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of msho2d.for from the SEPRAN library +// ("Ingenieursbureau SEPRA", Niek Praagman, 1989-2011). + +#pragma once + +#include "SepranContext.hpp" + +#include + +namespace sepran +{ + +/// \brief Main advancing-front triangulation driver for a single 2D surface. +/// +/// Translated from Fortran \c msho2d (SEPRAN, Niek Praagman). +/// +/// \param coor i/o Interleaved flat coord array: coor[2*(k-1)]=x, coor[2*(k-1)+1]=y. +/// \param npoint i/o Number of nodes (in: boundary nodes; out: all nodes). +/// \param kbound i Flat boundary-edge pairs (1-based node indices), length 2*nbound. +/// \param nbound i Number of boundary edges. +/// \param kmeshc o Output triangle array: 3 node indices per element (1-based), flat. +/// \param nelem o Number of triangles generated. +/// \param boundary i Flat 2*numcrvboun array: [curveNr, startAddrInKbndpt] per curve. +/// \param numcrvboun i Number of curves in the boundary description. +/// \param npunt i Estimated total number of nodes in the final mesh. +/// \param inside i 1 = there are interior areas (holes/constraints). +/// \param holeinfo i Flat 2*(nholes+2) array with hole boundary info. +/// \param nholes i Number of holes. +/// \param reposition i Whether Laplacian repositioning is allowed. +/// \param kbndpt i Node-number sequence for boundary curves. +/// \param nbndpt i Length of kbndpt. +/// \param coar i Flat 3*ncoar array: [x, y, coarseness] per special point. +/// \param ncoar i Number of special (user coarseness) points. +/// \param userpoints i User-given sequence numbers for the ncoar special points. +/// \param cocurv i Flat 2*totalCurvNodes array of internal-curve node coordinates. +/// \param ncurvs i Number of internal curves. +/// \param curves i Node counts per internal curve (length ncurvs). +/// \param crvnrs i User-given curve numbers (length ncurvs). +/// \param istep i 1 = linear elements, 2 = quadratic. +/// \param extquanodes i Help array for quadratic internal line data. +/// \param isurnr i Surface sequence number (for diagnostics). +/// \param rinput i Real input array: [1..ndim*nuspnt+2+nuspnt] coarseness/user-data. +/// \param nuspnt i Number of user-prescribed nodes. +/// \param ndim i Spatial dimension of the original problem. +/// \param ctx i/o SEPRAN error/constant context. +void msho2d(std::span coor, + int& npoint, + std::span kbound, + int nbound, + std::span kmeshc, + int& nelem, + std::span boundary, + int numcrvboun, + int npunt, + int inside, + std::span holeinfo, + int nholes, + bool reposition, + std::span kbndpt, + int nbndpt, + std::span coar, + int ncoar, + std::span userpoints, + std::span cocurv, + int ncurvs, + std::span curves, + std::span crvnrs, + int istep, + std::span extquanodes, + int isurnr, + std::span rinput, + int nuspnt, + int ndim, + SepranContext& ctx); + +} // namespace sepran diff --git a/extern/sepran/Mshoce.cpp b/extern/sepran/Mshoce.cpp new file mode 100644 index 000000000..c0fbc3cd9 --- /dev/null +++ b/extern/sepran/Mshoce.cpp @@ -0,0 +1,222 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of mshoce.for from the SEPRAN library +// ("Ingenieursbureau SEPRA", Niek Praagman, 1989-2010). + +#include "Mshoce.hpp" + +#include "Msho2d.hpp" +#include "SepranBoundary.hpp" +#include "SepranContext.hpp" +#include "SepranQuadratic.hpp" + +#include +#include + +namespace sepran +{ + +void mshoce(bool jnew, + std::span coor, + std::span kmeshc, + int inpelm, + int nbound, + std::span bcord, + std::span kbndpt, + std::span boundary, + int numcurvboun, + int& npoint, + int& nelem, + std::span holeinfo, + int nholes, + int ncoar, + std::span coar, + std::span userpoints, + int isurnr, + int numextcurves, + std::span numnodextcurvs, + std::span curvenumbers, + std::span rinput, + int nuspnt, + int ndim, + SepranContext& ctx) +{ + // --- Estimated total node count (= capacity of coor array) + const int npunt = npoint; + + // --- Allocate local boundary-edge array + std::vector kbound(2 * npunt, 0); + + // --- Copy boundary coordinates into coor (output node array) + BoundaryCopyResult bcr = copyBoundary( + nbound, + bcord, + coor, + kbndpt, + std::span(kbound), + true, + ctx); + + if (ctx.ierror != 0) return; + + const int jpnt = bcr.jpnt; + const int inside = bcr.inside; + int nbn = bcr.nbn; + + if (jnew) + { + // ---- Generating a new mesh ---------------------------------------- + npoint = jpnt; + int istep = 1; + + // --- Allocate extquanodes help array + std::vector extquanodes; + + if (inpelm == 6 || inpelm == 7) + { + // Quadratic: double-up boundary connectivity (every other edge) + istep = 2; + nbn = nbn / 2; + + for (int i = 0; i < nbn; ++i) + { + kbound[2 * i] = kbound[4 * i]; + kbound[2 * i + 1] = kbound[4 * i + 3]; + } + + // Compute extra nodes on internal curves + int nnodes = 0; + for (int i = 0; i < numextcurves; ++i) + nnodes += numnodextcurvs[i]; + if (nnodes == 0) nnodes = 1; + + extquanodes.assign(2 * nnodes, 0); + extquanodes[0] = 0; + } + else + { + extquanodes.assign(1, 0); + } + + // --- Build internal-curve coordinate span + // bcord layout: [2*nbound outer nodes][2*totalInternalNodes internal nodes] + const std::span cocurv = bcord.subspan(2 * nbound); + + int nbndpt_loc = nbound; + + // --- Main triangulation + msho2d(coor, npoint, + std::span(kbound.data(), 2 * nbn), nbn, + kmeshc, nelem, + boundary, numcurvboun, + npunt, + inside, + holeinfo, nholes, + true, // reposition = .true. + kbndpt, nbndpt_loc, + coar, ncoar, + userpoints, + cocurv, + numextcurves, + numnodextcurvs, + curvenumbers, + istep, + std::span(extquanodes), + isurnr, + rinput, + nuspnt, ndim, + ctx); + + if (ctx.ierror != 0) return; + + // --- Upgrade to quadratic elements if needed + if (inpelm == 6 || inpelm == 7) + { + msho31(coor, npoint, kmeshc, nelem, + std::span(kbound.data(), 2 * nbn), nbn, + std::span(extquanodes), + ctx); + + if (ctx.ierror != 0) return; + // (inpelm==7 centroid placement omitted – not needed for MeshKernel) + } + } + else + { + // ---- Repositioning only (jnew == false) ----------------------------- + // mshrep is not translated; only handle quadratic renaming below. + + int nbndpt_loc2 = jpnt; + (void)nbndpt_loc2; + + if (inpelm == 6 || inpelm == 7) + { + int npunt_out = 0; + msho32(kmeshc, nelem, inpelm, npunt_out); + if (ctx.ierror != 0) return; + + npoint = (npunt_out > jpnt) ? npunt_out : jpnt; + nbn = nbn / 2; + + for (int i = 0; i < nbn; ++i) + { + kbound[2 * i] = kbound[4 * i]; + kbound[2 * i + 1] = kbound[4 * i + 3]; + } + + // Compute extra nodes + int nnodes = 0; + for (int i = 0; i < numextcurves; ++i) + nnodes += numnodextcurvs[i]; + if (nnodes == 0) nnodes = 1; + + std::vector extquanodes2(2 * nnodes, 0); + extquanodes2[0] = 0; + + msho31(coor, npoint, kmeshc, nelem, + std::span(kbound.data(), 2 * nbn), nbn, + std::span(extquanodes2), + ctx); + if (ctx.ierror != 0) return; + } + } + + // --- For quadratic elements: re-copy the boundary coords to get exact positions + if (ctx.igobs == 0 && inpelm > 4) + { + std::vector kboundTmp(2 * npunt, 0); + copyBoundary( + nbound, bcord, coor, + kbndpt, + std::span(kboundTmp), + false, + ctx); + } +} + +} // namespace sepran diff --git a/extern/sepran/Mshoce.hpp b/extern/sepran/Mshoce.hpp new file mode 100644 index 000000000..2f25473c2 --- /dev/null +++ b/extern/sepran/Mshoce.hpp @@ -0,0 +1,96 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of mshoce.for from the SEPRAN library. + +#pragma once + +#include "SepranContext.hpp" + +#include + +namespace sepran +{ + +/// \brief Main entry point for SEPRAN surface triangulation. +/// +/// Translated from Fortran \c mshoce (SEPRAN, Niek Praagman, 1989-2010). +/// +/// Orchestrates boundary copying, advancing-front triangulation (msho2d), +/// and optional upgrade to quadratic triangles (msho31). +/// +/// \param jnew i true = generate new mesh; false = reposition only. +/// \param coor o Flat interleaved output node coords (length >= 2*npunt). +/// \param kmeshc o Flat element array. Linear: 3 nodes/elem; quadratic: 6. +/// \param inpelm i Nodes per element: 3 (linear), 6 or 7 (quadratic). +/// \param nbound i Number of nodes described in bcord. +/// \param bcord i Flat 2*nbound boundary coord array: [x0,y0, x1,y1, ...]. +/// Internal-curve coords follow immediately at bcord[2*nbound+]. +/// \param kbndpt o Boundary-point node-number array (length >= nbound). +/// \param boundary i Flat 2*numcurvboun array: [curveNr, kbndptStart] per curve. +/// \param numcurvboun i Number of curves in the boundary description. +/// \param npoint o Number of nodes in the output mesh. +/// \param nelem o Number of elements in the output mesh. +/// \param holeinfo i Flat 2*(nholes+2) hole information array. +/// \param nholes i Number of holes. +/// \param ncoar i Number of internal coarseness-control points. +/// \param coar i Flat 3*ncoar array: [x, y, coarseness] per point. +/// \param userpoints i User sequence numbers for the ncoar special points. +/// \param isurnr i Surface sequence number (used for diagnostics). +/// \param numextcurves i Number of extra internal curves. +/// \param numnodextcurvs i Node counts per internal curve (length numextcurves). +/// \param curvenumbers i User curve numbers (length numextcurves). +/// \param rinput i Real input array with coarseness/user-data. +/// \param nuspnt i Number of user-prescribed nodes. +/// \param ndim i Spatial dimension of the original problem. +/// \param ctx i/o SEPRAN error/constant context. +void mshoce(bool jnew, + std::span coor, + std::span kmeshc, + int inpelm, + int nbound, + std::span bcord, + std::span kbndpt, + std::span boundary, + int numcurvboun, + int& npoint, + int& nelem, + std::span holeinfo, + int nholes, + int ncoar, + std::span coar, + std::span userpoints, + int isurnr, + int numextcurves, + std::span numnodextcurvs, + std::span curvenumbers, + std::span rinput, + int nuspnt, + int ndim, + SepranContext& ctx); + +} // namespace sepran diff --git a/extern/sepran/SepranBoundary.cpp b/extern/sepran/SepranBoundary.cpp new file mode 100644 index 000000000..e59667c52 --- /dev/null +++ b/extern/sepran/SepranBoundary.cpp @@ -0,0 +1,213 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of mshcopyboun.for and mshchkstapl.for from the SEPRAN library. +// +// Original authors: +// mshcopyboun – Guus Segal, 1999-2001 +// mshchkstapl – Guus Segal, 2003 + +#include "SepranBoundary.hpp" +#include "SepranSort.hpp" + +#include +#include +#include +#include +#include +#include + +namespace sepran +{ + +// --------------------------------------------------------------------------- +// copyBoundary (mshcopyboun.for) +// --------------------------------------------------------------------------- + +BoundaryCopyResult copyBoundary(int nbound, + std::span bcord, + std::span coor, + std::span kbndpt, + std::span kbound, + bool fillKbound, + const SepranContext& /*ctx*/) +{ + // Initialize outputs + int nbn = 0; + int jpnt = 0; + int inside = -1; + + if (nbound == 0) + return {jpnt, inside, nbn}; + + // bcord is stored interleaved: bcord[2*i]=x, bcord[2*i+1]=y (0-based node i) + // Compute reference distance from first two points + const double dx = bcord[2] - bcord[0]; + const double dy = bcord[3] - bcord[1]; + const double ref = 1.0e-5 * std::sqrt(dx * dx + dy * dy); + + // ------------------------------------------------------------------- + // Detect closed-loop boundaries and store the index of the last node + // of each loop in ihelp. + // ------------------------------------------------------------------- + std::vector ihelp; // ihelp[j] = 0-based index of last node of loop j + ihelp.reserve(1 + nbound / 2); + + int ifirst = 0; + while (true) + { + const double xst = bcord[2 * ifirst]; + const double yst = bcord[2 * ifirst + 1]; + + // Find the last node that coincides with the starting node + int ilast = nbound - 1; + for (int i = ifirst + 1; i < nbound; ++i) + { + const double dxi = bcord[2 * i] - xst; + const double dyi = bcord[2 * i + 1] - yst; + if (std::sqrt(dxi * dxi + dyi * dyi) <= ref) + ilast = i; + } + + ihelp.push_back(ilast); + if (ilast == nbound - 1) + break; + ifirst = ilast + 1; + } + + const int nparts = static_cast(ihelp.size()); + + // ------------------------------------------------------------------- + // Loop over all closed parts + // ------------------------------------------------------------------- + int partStart = 0; // 0-based index of first node of current part + for (int j = 0; j < nparts; ++j) + { + const int partEnd = ihelp[j]; // 0-based index of last node of current part + + // Start of this part + const int jst = jpnt + 1; // 1-based first node number of this part + + for (int i = partStart; i <= partEnd; ++i) + { + const double xp = bcord[2 * i]; + const double yp = bcord[2 * i + 1]; + + if (i == partStart) + { + // First node of a new closed loop + if (inside < 1) ++inside; + ++jpnt; + coor[2 * (jpnt - 1)] = xp; // 1-based jpnt → 0-based index + coor[2 * (jpnt - 1) + 1] = yp; + if (fillKbound) + kbndpt[i] = jpnt; + } + else + { + // Subsequent node in the loop + if (fillKbound) + { + ++nbn; + kbound[2 * (nbn - 1)] = jpnt; + kbound[2 * (nbn - 1) + 1] = jpnt + 1; + } + + if (i == partEnd) + { + // Last node of closed loop — wraps back to first + if (fillKbound) + { + kbound[2 * (nbn - 1) + 1] = jst; + kbndpt[i] = jst; + } + } + else + { + ++jpnt; + coor[2 * (jpnt - 1)] = xp; + coor[2 * (jpnt - 1) + 1] = yp; + if (fillKbound) + kbndpt[i] = jpnt; + } + } + } + + partStart = partEnd + 1; + } + + return {jpnt, inside, nbn}; +} + +// --------------------------------------------------------------------------- +// checkStaple (mshchkstapl.for) +// --------------------------------------------------------------------------- + +void checkStaple(std::span kstapl, int lenkstapl, std::string_view text) +{ + if (lenkstapl == 0) + return; + + // kstapl is stored flat: [n1_0, n2_0, n1_1, n2_1, ...] + // Sort column 1 (first nodes) and column 2 (second nodes) separately, + // then check that they contain the same set of node numbers. + + std::vector iwork(lenkstapl); + std::vector ihelp(lenkstapl); + std::vector iseq1(lenkstapl); + std::vector iseq2(lenkstapl); + + // Column 1 + for (int i = 0; i < lenkstapl; ++i) + iwork[i] = kstapl[2 * i]; + heapSort(iwork, ihelp); + for (int i = 0; i < lenkstapl; ++i) + iseq1[i] = iwork[ihelp[i]]; + + // Column 2 + for (int i = 0; i < lenkstapl; ++i) + iwork[i] = kstapl[2 * i + 1]; + heapSort(iwork, ihelp); + for (int i = 0; i < lenkstapl; ++i) + iseq2[i] = iwork[ihelp[i]]; + + // Compare + for (int i = 0; i < lenkstapl; ++i) + { + if (iseq1[i] != iseq2[i]) + { + std::cerr << text << '\n' + << "Both columns of kstapl do not contain the same node numbers\n" + << "The " << i << "-th nodes are different\n"; + for (int k = 0; k < lenkstapl; ++k) + std::cerr << k << ": " << iseq1[k] << " " << iseq2[k] << '\n'; + break; // Diagnostic only; do not throw (matches Fortran behaviour) + } + } +} + +} // namespace sepran diff --git a/extern/sepran/SepranBoundary.hpp b/extern/sepran/SepranBoundary.hpp new file mode 100644 index 000000000..8cdb94ef4 --- /dev/null +++ b/extern/sepran/SepranBoundary.hpp @@ -0,0 +1,92 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of mshcopyboun.for and mshchkstapl.for from the SEPRAN library. + +#pragma once + +#include "SepranContext.hpp" + +#include +#include + +namespace sepran +{ + +/// \brief Result of copyBoundary. +struct BoundaryCopyResult +{ + int jpnt; ///< Last node number used (1-based). + int inside; ///< Count of internal regions: -1 for outer only, 0+ with holes. + int nbn; ///< Number of boundary edges written into kbound. +}; + +/// \brief Copy boundary coordinates into the node coordinate array. +/// +/// Translated from Fortran \c mshcopyboun (SEPRAN, Guus Segal, 1999-2001). +/// +/// Fills \p coor (first nbn boundary nodes), \p kbndpt (boundary node numbers), +/// and \p kbound (boundary edge connectivity). +/// +/// Array index convention (same as Fortran): +/// - \p bcord and \p coor are stored interleaved: [x0,y0, x1,y1, ...] (0-based node access). +/// - Node number values stored in \p kbndpt and \p kbound are **1-based** (matching the +/// convention used throughout the SEPRAN internal arrays). +/// +/// \param nbound Number of nodes in bcord (boundary description). +/// \param bcord Flat boundary coordinate array (length 2*nbound), interleaved x,y. +/// \param coor Output node coordinate array (pre-allocated, length >= 2*nbound). +/// \param kbndpt Output: node number for each boundary description point (length nbound). +/// \param kbound Output: flat edge-node pairs, 1-based (length >= 2*nbound). +/// \param fillKbound If true, fill kbndpt and kbound; otherwise only fill coor. +/// \param ctx SEPRAN context. +/// \return BoundaryCopyResult with jpnt, inside, nbn. +BoundaryCopyResult copyBoundary(int nbound, + std::span bcord, + std::span coor, + std::span kbndpt, + std::span kbound, + bool fillKbound, + const SepranContext& ctx); + +/// \brief Consistency check on the kstapl (staple) array. +/// +/// Translated from Fortran \c mshchkstapl (SEPRAN, Guus Segal, 2003). +/// +/// Verifies that every node on the left-hand side of a kstapl pair also appears +/// on the right-hand side. Prints a diagnostic message if not (debug aid; does +/// not throw). +/// +/// \param kstapl Flat edge pairs, stored as [n1_0, n2_0, n1_1, n2_1, ...]. +/// Node indices are 1-based. Length 2*lenkstapl. +/// \param lenkstapl Number of pairs in kstapl. +/// \param text Descriptive label printed if an inconsistency is found. +void checkStaple(std::span kstapl, + int lenkstapl, + std::string_view text); + +} // namespace sepran diff --git a/extern/sepran/SepranContext.hpp b/extern/sepran/SepranContext.hpp new file mode 100644 index 000000000..22cd7b5ae --- /dev/null +++ b/extern/sepran/SepranContext.hpp @@ -0,0 +1,65 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of the Fortran module mshconstants.f90 and msherror module +// from the SEPRAN library ("Ingenieursbureau SEPRA"). +// +// This header is intentionally header-only (no .cpp needed). + +#pragma once + +namespace sepran +{ + +/// \brief Runtime context carrying numerical constants and error state. +/// +/// In the original Fortran this was split across two Fortran modules: +/// - mshconstants: EPSMAC, SQREPS, RINFIN, IREFWR, ITIME, IGOBS, JTIMES +/// - msherror: IERROR +/// +/// In C++ we combine both into a single context object that is passed (by +/// reference) through the call stack instead of being global module state. +struct SepranContext +{ + double epsmac = 1.0e-15; ///< Machine epsilon (EPSMAC in Fortran) + double sqreps = 1.0e-15; ///< Square root of machine epsilon (SQREPS) + double rinfin = 1.0e77; ///< Large sentinel value (RINFIN) + + int itime = 1; ///< Timing flag (ITIME) + int igobs = 1; ///< Observer flag (IGOBS) + int jtimes = 1; ///< Timing multiplier (JTIMES) + + int ierror = 0; ///< Error flag; non-zero indicates an error (IERROR) + + /// \brief Return a default-initialized context with the standard SEPRAN constants. + static SepranContext defaults() noexcept + { + return SepranContext{}; + } +}; + +} // namespace sepran diff --git a/extern/sepran/SepranCurveIntersection.cpp b/extern/sepran/SepranCurveIntersection.cpp new file mode 100644 index 000000000..71f269ffe --- /dev/null +++ b/extern/sepran/SepranCurveIntersection.cpp @@ -0,0 +1,196 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of mshcurvinters.for, mshcurvinters1.for, and mshcurvinters2.for +// from the SEPRAN library. +// +// Original author: Guus Segal, 2005. + +#include "SepranCurveIntersection.hpp" +#include "SepranGeometry.hpp" + +#include +#include +#include + +namespace sepran +{ + +// Helper: access the flat xbox 3D array stored in Fortran column-major order: +// xbox(coord, curve, minmax) → xbox[coord + 2*curve + 2*ncurvs*minmax] +// coord = 0 (x) or 1 (y) +// curve = 0-based curve index +// minmax = 0 (minimum) or 1 (maximum) +static double xboxAt(std::span xbox, int ncurvs, int coord, int curve, int minmax) +{ + return xbox[coord + 2 * curve + 2 * ncurvs * minmax]; +} + +// --------------------------------------------------------------------------- +// curvIntersectionPair (mshcurvinters1.for) +// --------------------------------------------------------------------------- + +void curvIntersectionPair(int icurnr, + int jcurnr, + std::span icurvs, + std::span curves, + SepranContext& ctx) +{ + if (ctx.ierror != 0) + return; + + const double eps = ctx.sqreps; + + // Start positions (0-based node index into flat curves array) + const int istart = (icurnr == 0) ? 0 : icurvs[icurnr - 1]; + const int inodes = icurvs[icurnr] - istart; + + const int jstart = (jcurnr == 0) ? 0 : icurvs[jcurnr - 1]; + const int jnodes = icurvs[jcurnr] - jstart; + + // curves is stored interleaved: x at [2*k], y at [2*k+1] (0-based node index k) + std::array x1{curves[2 * istart], curves[2 * istart + 1]}; + + for (int j = 1; j < inodes; ++j) + { + const std::array x2{curves[2 * (istart + j)], curves[2 * (istart + j) + 1]}; + + std::array x3{curves[2 * jstart], curves[2 * jstart + 1]}; + + for (int k = 1; k < jnodes; ++k) + { + const std::array x4{curves[2 * (jstart + k)], curves[2 * (jstart + k) + 1]}; + + double fact1, fact2; + crossLine1(x1, x2, x3, x4, fact1, fact2, eps, ctx); + + // Interior intersection only (not at shared endpoints) + if (fact1 > eps && fact1 < 1.0 - eps && + fact2 > eps && fact2 < 1.0 - eps) + { + ctx.ierror = 1; + throw std::runtime_error( + "SEPRAN: curves " + std::to_string(icurnr) + " and " + + std::to_string(jcurnr) + " intersect (error 2787)"); + } + + x3 = x4; + } + x1 = x2; + } +} + +// --------------------------------------------------------------------------- +// curvIntersectionCheck (mshcurvinters.for) +// --------------------------------------------------------------------------- + +void curvIntersectionCheck(int ncurvs, + std::span iwork, + std::span xbox, + std::span icurvs, + std::span curves, + SepranContext& ctx) +{ + if (ctx.ierror != 0) + return; + + for (int icurnr = 0; icurnr < ncurvs; ++icurnr) + { + if (iwork[icurnr] != 0) + continue; // Only process single curves + + for (int jcurnr = icurnr + 1; jcurnr < ncurvs; ++jcurnr) + { + if (iwork[jcurnr] != 0) + continue; + + // Quick bounding-box check (Fortran: go to 200 on no overlap) + if (xboxAt(xbox, ncurvs, 0, icurnr, 0) > xboxAt(xbox, ncurvs, 0, jcurnr, 1)) + continue; + if (xboxAt(xbox, ncurvs, 0, jcurnr, 0) > xboxAt(xbox, ncurvs, 0, icurnr, 1)) + continue; + if (xboxAt(xbox, ncurvs, 1, icurnr, 0) > xboxAt(xbox, ncurvs, 1, jcurnr, 1)) + continue; + if (xboxAt(xbox, ncurvs, 1, jcurnr, 0) > xboxAt(xbox, ncurvs, 1, icurnr, 1)) + continue; + + curvIntersectionPair(icurnr, jcurnr, icurvs, curves, ctx); + if (ctx.ierror != 0) + return; + } + } +} + +// --------------------------------------------------------------------------- +// boundarySelfIntersectionCheck (mshcurvinters2.for) +// --------------------------------------------------------------------------- + +void boundarySelfIntersectionCheck(std::span kbound, + int nbound, + std::span coor, + int isurnr, + SepranContext& ctx) +{ + if (ctx.ierror != 0) + return; + + constexpr double eps = 1.0e-3; + + for (int i = 0; i < nbound - 1; ++i) + { + // kbound stores 1-based node indices; convert to 0-based for coor access. + const int n1i = kbound[2 * i] - 1; // first node of edge i (0-based) + const int n2i = kbound[2 * i + 1] - 1; // second node of edge i (0-based) + + const std::array x1{coor[2 * n1i], coor[2 * n1i + 1]}; + const std::array x2{coor[2 * n2i], coor[2 * n2i + 1]}; + + for (int j = i + 1; j < nbound; ++j) + { + const int n1j = kbound[2 * j] - 1; + const int n2j = kbound[2 * j + 1] - 1; + + const std::array x3{coor[2 * n1j], coor[2 * n1j + 1]}; + const std::array x4{coor[2 * n2j], coor[2 * n2j + 1]}; + + double fact1, fact2; + crossLine1(x1, x2, x3, x4, fact1, fact2, eps, ctx); + + if (fact1 > eps && fact1 < 1.0 - eps && + fact2 > eps && fact2 < 1.0 - eps) + { + ctx.ierror = 1; + throw std::runtime_error( + "SEPRAN: boundary of surface " + std::to_string(isurnr) + + " intersects itself at edges " + std::to_string(i) + + " and " + std::to_string(j) + " (error 2788)"); + } + } + } +} + +} // namespace sepran diff --git a/extern/sepran/SepranCurveIntersection.hpp b/extern/sepran/SepranCurveIntersection.hpp new file mode 100644 index 000000000..5d97c6634 --- /dev/null +++ b/extern/sepran/SepranCurveIntersection.hpp @@ -0,0 +1,102 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of mshcurvinters.for, mshcurvinters1.for, and mshcurvinters2.for +// from the SEPRAN library. + +#pragma once + +#include "SepranContext.hpp" + +#include + +namespace sepran +{ + +/// \brief Check that no two curves in a set mutually intersect. +/// +/// Translated from Fortran \c mshcurvinters (SEPRAN, Guus Segal, 2005). +/// +/// \param ncurvs Number of curves. +/// \param iwork Work array of length ncurvs. +/// iwork[i] = -1: empty, 0: single, 1: compound. +/// \param xbox Flat 3D bounding-box array, column-major layout: +/// xbox[ 0 + 2*(j) + 2*ncurvs*0 ] = min-x of curve j (0-based j) +/// xbox[ 1 + 2*(j) + 2*ncurvs*0 ] = min-y of curve j +/// xbox[ 0 + 2*(j) + 2*ncurvs*1 ] = max-x of curve j +/// xbox[ 1 + 2*(j) + 2*ncurvs*1 ] = max-y of curve j +/// \param icurvs Accumulated node counts per curve (length ncurvs). +/// icurvs[j] is the total number of nodes in curves 0..j. +/// \param curves Flat coordinate array for all curve nodes, interleaved x,y, +/// 1-based node indices (length 2 * total_nodes). +/// \param ctx SEPRAN context (reads ctx.ierror; sets ctx.ierror on error). +void curvIntersectionCheck(int ncurvs, + std::span iwork, + std::span xbox, + std::span icurvs, + std::span curves, + SepranContext& ctx); + +/// \brief Check that two specific curves do not intersect edge-by-edge. +/// +/// Translated from Fortran \c mshcurvinters1 (SEPRAN, Guus Segal, 2005). +/// +/// Throws std::runtime_error if an intersection is detected. +/// +/// \param icurnr 0-based index of the first curve. +/// \param jcurnr 0-based index of the second curve. +/// \param icurvs Accumulated node counts per curve (length >= max(icurnr,jcurnr)+1). +/// \param curves Flat coord array (interleaved x,y), 1-based node access. +/// \param ctx SEPRAN context. +void curvIntersectionPair(int icurnr, + int jcurnr, + std::span icurvs, + std::span curves, + SepranContext& ctx); + +/// \brief Check that the boundary edges of a surface do not mutually intersect. +/// +/// Translated from Fortran \c mshcurvinters2 (SEPRAN, Guus Segal, 2005). +/// +/// Sets ctx.ierror and throws std::runtime_error if self-intersection is found. +/// +/// \param kbound Flat edge-node array (1-based node indices), length 2*nbound. +/// kbound[2*i] = first node of edge i (0-based i). +/// kbound[2*i+1] = second node of edge i. +/// \param nbound Number of boundary edges. +/// \param coor Flat node coordinate array, interleaved x,y (1-based node indices). +/// coor[2*(k-1)] = x of node k (1-based k). +/// coor[2*(k-1)+1] = y of node k. +/// \param isurnr Surface sequence number (used in error message). +/// \param ctx SEPRAN context. +void boundarySelfIntersectionCheck(std::span kbound, + int nbound, + std::span coor, + int isurnr, + SepranContext& ctx); + +} // namespace sepran diff --git a/extern/sepran/SepranFront.cpp b/extern/sepran/SepranFront.cpp new file mode 100644 index 000000000..028da853c --- /dev/null +++ b/extern/sepran/SepranFront.cpp @@ -0,0 +1,2491 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// SepranFront.cpp - all translated functions +// +// C++20 translation of msho01, msho09, msho11, msho12, msho13, msho14, +// msho17, msho20, msho21, msho24, msho25, msho26, msho27, msho28, msho29, +// msho30, msho33, msho34, msho39, msho41, msho42, msho75 +// from the SEPRAN library ("Ingenieursbureau SEPRA", Niek Praagman, 1989-2010). +// +// TRANSLATION CONVENTIONS (flat-span layout): +// coor : interleaved flat; coor[2*(k-1)] = x, coor[2*(k-1)+1] = y (1-based k) +// kstapl : flat pairs; kstapl[2*s]=n1, kstapl[2*s+1]=n2 (0-based edge s) +// kelem : flat triples; kelem[3*e], [3*e+1], [3*e+2] (0-based elem e) +// itri : flat; itri[k-1] for 1-based node k +// istart : CSR ptr; istart[i-1] = cumulative neighbour count through node i + +#include "SepranFront.hpp" +#include "SepranContext.hpp" +#include "SepranGeometry.hpp" +#include "SepranTopology.hpp" +#include "SepranBoundary.hpp" + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +namespace sepran +{ + +// --------------------------------------------------------------------------- +// Forward declaration of internal helper (msho75) +// --------------------------------------------------------------------------- +static void checkSegmentIntersection(double xi, double yi, double xj, double yj, + double x1, double y1, double x2, double y2, + int& ih, const SepranContext& ctx); + +// --------------------------------------------------------------------------- +// msho01 – Check boundary elements; fill coarse array for each point +// --------------------------------------------------------------------------- +// +// Parameters (C++ 0-based spans): +// kbound i flat boundary element pairs (kbound[2*e]=n1, [2*e+1]=n2) +// nbound i number of boundary line segments +// istart i/o CSR row-pointer array (length npoint) +// ibuur i/o CSR adjacency list (pre-allocated) +// coarse o coarseness value per node (length npoint) +// coor i node coordinate array (interleaved flat) +// npoint i number of nodes +// coarsemin o minimum boundary coarseness +// coarsemax o maximum boundary coarseness +// coar i/o special-point array coar[3*(i-1)+2] = coarseness (1-based i) +// ncoar i number of special points in coar +// --------------------------------------------------------------------------- +void msho01(std::span kbound, + int nbound, + std::span istart, + std::span ibuur, + std::span coarse, + std::span coor, + int npoint, + double& coarsemin, + double& coarsemax, + std::span coar, + int ncoar, + SepranContext& ctx) +{ + coarsemin = ctx.rinfin; + coarsemax = -ctx.rinfin; + + // --- Count neighbours: istart[i] = degree of node i+1 (temporarily) + for (int i = 0; i < npoint; ++i) istart[i] = 0; + + for (int e = 0; e < nbound; ++e) + { + const int i1 = kbound[2 * e]; + const int i2 = kbound[2 * e + 1]; + istart[i1 - 1]++; + istart[i2 - 1]++; + } + + // --- Convert counts to cumulative CSR pointers + int itotal = 0; + for (int i = 0; i < npoint; ++i) + { + itotal += istart[i]; + istart[i] = itotal; + } + + // --- Clear ibuur then fill via insertNeighbour + for (int k = 0; k < itotal; ++k) ibuur[k] = 0; + + for (int e = 0; e < nbound; ++e) + { + const int i1 = kbound[2 * e]; + const int i2 = kbound[2 * e + 1]; + insertNeighbour(istart, ibuur, i1, i2); + insertNeighbour(istart, ibuur, i2, i1); + } + + // --- Check neighbour counts and compute per-node coarseness + int no = 0; + for (int i = 1; i <= npoint; ++i) + { + const int ni = istart[i - 1]; + const int ntal = ni - no; + + if (ntal != 0 && ntal != 2) + { + ctx.ierror = 1; + throw std::runtime_error( + "msho01: boundary point has wrong number of neighbours (error 905)"); + } + + double afstan = 0.0; + if (ntal > 0) + { + for (int k = no; k < no + ntal; ++k) + { + const int jknoop = ibuur[k]; + if (jknoop > 0) + afstan += nodeDistance(i, jknoop, coor); + } + coarse[i - 1] = afstan / ntal; + coarsemin = std::min(coarsemin, coarse[i - 1]); + coarsemax = std::max(coarsemax, coarse[i - 1]); + } + else + { + coarse[i - 1] = 0.0; + } + no = ni; + } + + // --- Back-fill missing coarsenesses in coar + const double coarsemean = 0.5 * (coarsemin + coarsemax); + for (int i = 0; i < ncoar; ++i) + { + // coar(3,i+1) in Fortran (1-based) = coar[3*i + 2] in C++ + if (coar[3 * i + 2] <= 1.0e-6) coar[3 * i + 2] = coarsemean; + } +} + +// --------------------------------------------------------------------------- +// msho09 – Perpendicular unit vector and midpoint of segment i→j +// --------------------------------------------------------------------------- +// +// coor i node coordinate array (interleaved flat) +// i i first node (1-based) +// j i second node (1-based) +// e1 o x-component of unit perpendicular vector +// e2 o y-component of unit perpendicular vector +// xm o x-coordinate of midpoint (slightly offset toward i) +// ym o y-coordinate of midpoint +// --------------------------------------------------------------------------- +void msho09(std::span coor, + int i, + int j, + double& e1, + double& e2, + double& xm, + double& ym) +{ + const double xi = coor[2 * (i - 1)]; + const double yi = coor[2 * (i - 1) + 1]; + const double xj = coor[2 * (j - 1)]; + const double yj = coor[2 * (j - 1) + 1]; + + e1 = -(yj - yi); + e2 = xj - xi; + + const double eleng = std::sqrt(e1 * e1 + e2 * e2); + e1 /= eleng; + e2 /= eleng; + + // Slightly asymmetric midpoint (intentional — matches Fortran exactly) + xm = 0.5000001234 * xi + 0.4999998766 * xj; + ym = 0.5000001234 * yi + 0.4999998766 * yj; +} + +// --------------------------------------------------------------------------- +// msho11 – Cosine of angle between line (i1→i2) and line (i2→i3) +// --------------------------------------------------------------------------- +// +// i1, i2, i3 i node indices (1-based) +// coor i node coordinate array (interleaved flat) +// angle o dot product (cosine); set to -1.5 if points coincide +// --------------------------------------------------------------------------- +void msho11(int i1, + int i2, + int i3, + std::span coor, + double& angle, + const SepranContext& ctx) +{ + const double x1 = coor[2 * (i1 - 1)], y1 = coor[2 * (i1 - 1) + 1]; + const double x2 = coor[2 * (i2 - 1)], y2 = coor[2 * (i2 - 1) + 1]; + const double x3 = coor[2 * (i3 - 1)], y3 = coor[2 * (i3 - 1) + 1]; + + // Direction i2→i3 + double e1 = x3 - x2, e2 = y3 - y2; + double eleng = std::sqrt(e1 * e1 + e2 * e2); + double h1 = (x2 + x3) * 0.5; + double h2 = (y2 + y3) * 0.5; + double hnorm = std::sqrt(h1 * h1 + h2 * h2); + + if (eleng < 1.0e2 * ctx.epsmac * hnorm) + { + angle = -1.5; + return; + } + e1 /= eleng; e2 /= eleng; + + // Direction i2→i1 + double e3 = x1 - x2, e4 = y1 - y2; + eleng = std::sqrt(e3 * e3 + e4 * e4); + h1 = (x1 + x2) * 0.5; + h2 = (y1 + y2) * 0.5; + hnorm = std::sqrt(h1 * h1 + h2 * h2); + + if (eleng < 1.0e2 * ctx.epsmac * hnorm) + { + angle = -1.5; + return; + } + e3 /= eleng; e4 /= eleng; + + angle = e1 * e3 + e2 * e4; +} + +// --------------------------------------------------------------------------- +// msho12 – Adjacent-line search and angle computation at endpoints of i1–i2 +// --------------------------------------------------------------------------- +// +// coor i node coordinate array (interleaved flat) +// kstapl i boundary edge list (flat pairs, kstap edges) +// kstap i number of edges in kstapl +// i1 i first node of base edge (1-based) +// i2 i second node of base edge (1-based) +// iex1 o node of best adjacent edge at i1 +// iex2 o node of best adjacent edge at i2 +// angle1 o best angle at i1 +// angle2 o best angle at i2 +// --------------------------------------------------------------------------- +void msho12(std::span coor, + std::span kstapl, + int kstap, + int i1, + int i2, + int& iex1, + int& iex2, + double& angle1, + double& angle2, + SepranContext& ctx) +{ + iex1 = 0; iex2 = 0; + angle1 = -1.2; angle2 = -1.2; + + for (int s = 0; s < kstap; ++s) + { + const int ii1 = kstapl[2 * s]; + const int ii2 = kstapl[2 * s + 1]; + + // Check edge ii1→ii2: does it adjoin i1 (i.e. ii2 == i1)? + if (i1 == ii2) + { + const double surf = triangleArea(coor, ii1, i1, i2); + double angle; + if (surf <= 0.0) + angle = -1.1; + else + msho11(ii1, i1, i2, coor, angle, ctx); + + if (angle > angle1) + { + iex1 = ii1; + angle1 = angle; + } + } + + // Check edge ii1→ii2: does it adjoin i2 (i.e. ii1 == i2)? + if (i2 == ii1) + { + const double surf = triangleArea(coor, i1, i2, ii2); + double angle; + if (surf <= 0.0) + angle = -1.1; + else + msho11(i1, i2, ii2, coor, angle, ctx); + + if (angle > angle2) + { + iex2 = ii2; + angle2 = angle; + } + } + } + + if (iex1 == 0 || iex2 == 0) + { + ctx.ierror = 1; + throw std::runtime_error("msho12: internal error in triangle (error 2433)"); + } +} + +// --------------------------------------------------------------------------- +// msho13 – Check whether lines from i1/i2 to new point (xn,yn) cross +// any existing boundary edge. +// +// coor i node coordinate array (2-component interleaved flat) +// i1, i2 i base edge nodes (1-based) +// kdrie o index (1-based) of first crossing edge; 0 = none; -1 = ambiguous +// kstapl i boundary edge list (flat pairs) +// kstap i number of edges in kstapl +// xn, yn i proposed new point coordinates +// --------------------------------------------------------------------------- +void msho13(std::span coor, + int i1, + int i2, + int& kdrie, + std::span kstapl, + int kstap, + double xn, + double yn, + const SepranContext& ctx) +{ + const double eps = 1.0e4 * ctx.epsmac; + + const double xi1 = coor[2 * (i1 - 1)], yi1 = coor[2 * (i1 - 1) + 1]; + const double xi2 = coor[2 * (i2 - 1)], yi2 = coor[2 * (i2 - 1) + 1]; + + const double xmin = std::min({xi1, xi2, xn}); + const double xmax = std::max({xi1, xi2, xn}); + const double ymin = std::min({yi1, yi2, yn}); + const double ymax = std::max({yi1, yi2, yn}); + + kdrie = 0; + + // Helper: update kdrie when a new crossing is found at edge s (0-based) + // Returns true if an ambiguous double-crossing (-1) was detected. + auto updateKdrie = [&](int s, double xMid, double yMid) -> bool + { + const int oneBasedS = s + 1; + if (kdrie == 0) + { + kdrie = oneBasedS; + return false; + } + if (kdrie > 0 && kdrie != oneBasedS) + { + // Double crossing — pick the one whose midpoint is closer to edge i1-i2 midpoint + const int ipn1_k = kstapl[2 * (kdrie - 1)]; + const int ipn2_k = kstapl[2 * (kdrie - 1) + 1]; + const double xpn1_k = (coor[2*(ipn1_k-1)] + coor[2*(ipn2_k-1)]) * 0.5; + const double ypn1_k = (coor[2*(ipn1_k-1)+1] + coor[2*(ipn2_k-1)+1]) * 0.5; + const double xpn2 = (xi1 + xi2) * 0.5; + const double ypn2 = (yi1 + yi2) * 0.5; + const double dis1 = (xpn1_k - xpn2)*(xpn1_k - xpn2) + (ypn1_k - ypn2)*(ypn1_k - ypn2); + + const int ipn1_s = kstapl[2 * s]; + const int ipn2_s = kstapl[2 * s + 1]; + const double xpn1_s = (coor[2*(ipn1_s-1)] + coor[2*(ipn2_s-1)]) * 0.5; + const double ypn1_s = (coor[2*(ipn1_s-1)+1] + coor[2*(ipn2_s-1)+1]) * 0.5; + const double dis2 = (xpn1_s - xpn2)*(xpn1_s - xpn2) + (ypn1_s - ypn2)*(ypn1_s - ypn2); + + if (dis2 < (1.0 - eps) * dis1) + kdrie = oneBasedS; + else if (dis2 < (1.0 + eps) * dis1) + { + kdrie = -1; + return true; // ambiguous + } + // else keep old kdrie + } + return false; + (void)xMid; (void)yMid; + }; + + // Loop over boundary edges, skipping index 0 (the current base edge) + for (int s = 1; s < kstap; ++s) + { + const int ii1 = kstapl[2 * s]; + const int ii2 = kstapl[2 * s + 1]; + + const double x1 = coor[2 * (ii1 - 1)], y1 = coor[2 * (ii1 - 1) + 1]; + const double x2 = coor[2 * (ii2 - 1)], y2 = coor[2 * (ii2 - 1) + 1]; + + const double xmi = std::min(x1, x2), xma = std::max(x1, x2); + const double ymi = std::min(y1, y2), yma = std::max(y1, y2); + + if (xmi > xmax || xma < xmin || ymi > ymax || yma < ymin) + continue; + + // --- Check line i1 → new point + if (i1 != ii1 && i1 != ii2) + { + const double dis1 = std::abs(xi1 - x1) + std::abs(yi1 - y1); + const double dis2 = std::abs(xi1 - x2) + std::abs(yi1 - y2); + const double h1 = std::abs(xi1) + std::abs(x1) + std::abs(yi1) + std::abs(y1); + const double h2 = std::abs(xi1) + std::abs(x2) + std::abs(yi1) + std::abs(y2); + + if (dis1 > eps * h1 && dis2 > eps * h2) + { + int ih; + checkSegmentIntersection(xi1, yi1, xn, yn, x1, y1, x2, y2, ih, ctx); + if (ih == 0) + if (updateKdrie(s, 0, 0)) return; + } + } + + // --- Check line i2 → new point + if (i2 != ii1 && i2 != ii2) + { + const double dis1 = std::abs(xi2 - x1) + std::abs(yi2 - y1); + const double dis2 = std::abs(xi2 - x2) + std::abs(yi2 - y2); + const double h1 = std::abs(xi2) + std::abs(x1) + std::abs(yi2) + std::abs(y1); + const double h2 = std::abs(xi2) + std::abs(x2) + std::abs(yi2) + std::abs(y2); + + if (dis1 > eps * h1 && dis2 > eps * h2) + { + int ih; + checkSegmentIntersection(xi2, yi2, xn, yn, x1, y1, x2, y2, ih, ctx); + if (ih == 0) + if (updateKdrie(s, 0, 0)) return; + } + } + + // --- Check line midpoint(i1,i2) → new point + double xh = (xi1 + xi2) * 0.5; + double yh = (yi1 + yi2) * 0.5; + xh = eps * xn + (1.0 - eps) * xh; + yh = eps * yn + (1.0 - eps) * yh; + + { + int ih; + checkSegmentIntersection(xh, yh, xn, yn, x1, y1, x2, y2, ih, ctx); + if (ih == 0) + if (updateKdrie(s, 0, 0)) return; + } + } +} + +// --------------------------------------------------------------------------- +// msho14 – Find the nearest boundary point to proposed new point (xn, yn) +// +// coor i node coordinate array (interleaved flat) +// jpn o node number of nearest boundary point (1-based; 0 if none) +// npoint i total number of nodes +// itri i per-node boundary membership counter +// i1, i2 i base edge nodes (excluded from search) +// xn, yn i proposed new point +// dista i/o current best distance (updated if closer point found) +// --------------------------------------------------------------------------- +void msho14(std::span coor, + int& jpn, + int npoint, + std::span itri, + int i1, + int i2, + double xn, + double yn, + double& dista) +{ + jpn = 0; + for (int ih = 1; ih <= npoint; ++ih) + { + if (ih == i1 || ih == i2 || itri[ih - 1] == 0) continue; + + const double xi = coor[2 * (ih - 1)]; + const double yi = coor[2 * (ih - 1) + 1]; + const double dx = xn - xi; + const double dy = yn - yi; + const double dist = std::sqrt(dx * dx + dy * dy); + + if (dist < dista) + { + jpn = ih; + dista = dist; + } + } +} + +// --------------------------------------------------------------------------- +// msho17 – Insert neighbour ij into the ibuurp array for node ih +// (uses a different pointer structure than msho02/insertNeighbour) +// +// ibuurp i/o neighbour array +// iwork i row-pointer array; iwork[i-1] = end of neighbours for node i +// ih i node whose neighbour list is extended (1-based) +// ij i neighbour node to insert (1-based) +// --------------------------------------------------------------------------- +void msho17(std::span ibuurp, + std::span iwork, + int ih, + int ij) +{ + // jstart will be 1-based into ibuurp + int jstart = (ih != 1) ? iwork[ih - 2] : 0; + + for (;;) + { + ++jstart; + const int val = ibuurp[jstart - 1]; + if (val == ij) return; // already present + if (val != 0) continue; // slot occupied, advance + ibuurp[jstart - 1] = ij; // insert + return; + } +} + +// --------------------------------------------------------------------------- +// msho20 – Cyclic rotation of kstapl: move first edge to last position +// and update itri accordingly. +// +// kstapl i/o boundary edge list (flat pairs) +// kstap i number of edges +// itri i/o per-node boundary membership counter +// --------------------------------------------------------------------------- +void msho20(std::span kstapl, + int kstap, + std::span itri) +{ + const int i1 = kstapl[0]; + const int i2 = kstapl[1]; + + // Shift elements left by one position + for (int ikl = 1; ikl < kstap; ++ikl) + { + kstapl[2 * (ikl - 1)] = kstapl[2 * ikl]; + kstapl[2 * (ikl - 1) + 1] = kstapl[2 * ikl + 1]; + } + + kstapl[2 * (kstap - 1)] = i1; + kstapl[2 * (kstap - 1) + 1] = i2; + + itri[i1 - 1]++; + itri[i2 - 1]++; +} + +// --------------------------------------------------------------------------- +// msho21 – Compute reference triangle-area values for each cube cell +// +// cube i coarseness per cell (length ncube) +// ncube i number of cells +// refvol o reference surface value = 0.5 * coarseness^2 +// --------------------------------------------------------------------------- +void msho21(std::span cube, + int ncube, + std::span refvol) +{ + for (int i = 0; i < ncube; ++i) + refvol[i] = 0.5 * cube[i] * cube[i]; +} + +// --------------------------------------------------------------------------- +// msho24 – Check whether line i1–i2 shares a point with any boundary edge +// +// kstapl i boundary edge list (flat pairs, kstap edges) +// kstap i number of boundary edges +// coor i node coordinate array (interleaved flat) +// i1, i2 i line nodes (1-based) +// icheck o -1: only Plaxis endpoints coincide; +// 0: no common point found; +// >0: 1-based index of intersecting edge +// --------------------------------------------------------------------------- +void msho24(std::span kstapl, + int kstap, + std::span coor, + int i1, + int i2, + int& icheck, + const SepranContext& ctx) +{ + const double eps = 10.0 * ctx.epsmac; + + icheck = -1; + + const double x1 = coor[2 * (i1 - 1)], y1 = coor[2 * (i1 - 1) + 1]; + const double x2 = coor[2 * (i2 - 1)], y2 = coor[2 * (i2 - 1) + 1]; + + const double xmin = std::min(x1, x2), xmax = std::max(x1, x2); + const double ymin = std::min(y1, y2), ymax = std::max(y1, y2); + + for (int il = 0; il < kstap; ++il) + { + const int ia = kstapl[2 * il]; + const int ib = kstapl[2 * il + 1]; + + // Skip if boundary edge shares a node with i1–i2 + if (ia == i1 || ia == i2) continue; + if (ib == i1 || ib == i2) continue; + + const double xa = coor[2 * (ia - 1)], ya = coor[2 * (ia - 1) + 1]; + const double xb = coor[2 * (ib - 1)], yb = coor[2 * (ib - 1) + 1]; + + // Coincidence of ia with i1 + double dis = (x1 - xa)*(x1 - xa) + (y1 - ya)*(y1 - ya); + if (dis < eps) continue; + + // Coincidence of ia with i2 (Plaxis point) + dis = (x2 - xa)*(x2 - xa) + (y2 - ya)*(y2 - ya); + if (dis < eps) { icheck = il + 1; return; } + + // Coincidence of ib with i1 + dis = (x1 - xb)*(x1 - xb) + (y1 - yb)*(y1 - yb); + if (dis < eps) continue; + + // Coincidence of ib with i2 (Plaxis point) + dis = (x2 - xb)*(x2 - xb) + (y2 - yb)*(y2 - yb); + if (dis < eps) { icheck = il + 1; return; } + + // Bounding-box pre-check + if (std::min(xa, xb) > xmax) continue; + if (std::max(xa, xb) < xmin) continue; + if (std::min(ya, yb) > ymax) continue; + if (std::max(ya, yb) < ymin) continue; + + int ih; + checkSegmentIntersection(xa, ya, xb, yb, x1, y1, x2, y2, ih, ctx); + if (ih == 0) { icheck = il + 1; return; } + } + + icheck = 0; +} + +// --------------------------------------------------------------------------- +// msho25 – Move the shortest edge in kstapl to position 0 +// +// kstapl i/o boundary edge list (flat pairs) +// kstap i number of edges +// coor i node coordinate array (interleaved flat) +// --------------------------------------------------------------------------- +void msho25(std::span kstapl, + int kstap, + std::span coor, + const SepranContext& ctx) +{ + int ielem = -1; + double afref = ctx.rinfin; + + for (int il = 0; il < kstap; ++il) + { + const int ia = kstapl[2 * il]; + const int ib = kstapl[2 * il + 1]; + const double xa = coor[2 * (ia - 1)], ya = coor[2 * (ia - 1) + 1]; + const double xb = coor[2 * (ib - 1)], yb = coor[2 * (ib - 1) + 1]; + const double dx = xb - xa, dy = yb - ya; + const double afst = dx * dx + dy * dy; + + if (afst < 0.98 * afref) + { + afref = afst; + ielem = il; + } + } + + // Swap element ielem with element 0 (only if ielem is not already 0) + if (ielem > 0) + { + const int i1 = kstapl[2 * ielem]; + const int i2 = kstapl[2 * ielem + 1]; + kstapl[2 * ielem] = kstapl[0]; + kstapl[2 * ielem + 1] = kstapl[1]; + kstapl[0] = i1; + kstapl[1] = i2; + } +} + +// --------------------------------------------------------------------------- +// msho26 – Find the triangle (other than ielem) that has edge i2–i3 as a side +// +// kelem i element array (flat triples of 1-based node indices) +// nelem i number of elements +// i2 i first node of shared edge (1-based) +// i3 i second node of shared edge (1-based) +// jelem i/o i: known element containing i2–i3; o: neighbouring element (1-based; 0 if none) +// i4 o third node of the neighbouring triangle (1-based; 0 if not found) +// --------------------------------------------------------------------------- +void msho26(std::span kelem, + int nelem, + int i2, + int i3, + int& jelem, + int& i4) +{ + const int ielem = jelem; + jelem = 0; + i4 = 0; + + for (int j = 0; j < nelem; ++j) + { + if (j == ielem) continue; // skip known element (0-based) + + const int j1 = kelem[3 * j]; + const int j2 = kelem[3 * j + 1]; + const int j3 = kelem[3 * j + 2]; + + if (j1 == i3 && j2 == i2) { jelem = j; i4 = j3; return; } + else if (j2 == i3 && j3 == i2) { jelem = j; i4 = j1; return; } + else if (j3 == i3 && j1 == i2) { jelem = j; i4 = j2; return; } + } +} + +// --------------------------------------------------------------------------- +// msho27 – Select best diagonal in quadrilateral (i1,i2,i3,i4) +// Current diagonal is i2–i3; may be replaced by i1–i4. +// +// coor i/o node coordinate array (interleaved flat) +// i1,i2,i3,i4 i/o quadrilateral nodes; may be reordered on output +// --------------------------------------------------------------------------- +void msho27(std::span coor, + int& i1, + int& i2, + int& i3, + int& i4, + const SepranContext& ctx) +{ + const int j1 = i1, j2 = i2, j3 = i3, j4 = i4; + + const double xa = coor[2 * (i1 - 1)], ya = coor[2 * (i1 - 1) + 1]; + const double xb = coor[2 * (i2 - 1)], yb = coor[2 * (i2 - 1) + 1]; + const double xc = coor[2 * (i3 - 1)], yc = coor[2 * (i3 - 1) + 1]; + const double xd = coor[2 * (i4 - 1)], yd = coor[2 * (i4 - 1) + 1]; + + const double det = (xa - xb) * (ya - yc) - (xa - xc) * (ya - yb); + + if (std::abs(det) < 10.0 * ctx.epsmac) + { + // Triangle 1-2-3 degenerate — use diagonal 1–4 + i1 = j2; i2 = j4; i3 = j1; i4 = j3; + } + else + { + // Circumcentre of triangle i1-i2-i3 + const double xm = ((xa*xa + ya*ya) * (yb - yc) + + (xb*xb + yb*yb) * (yc - ya) + + (xc*xc + yc*yc) * (ya - yb)) / (2.0 * det); + const double ym = ((xa*xa + ya*ya) * (xb - xc) + + (xb*xb + yb*yb) * (xc - xa) + + (xc*xc + yc*yc) * (xa - xb)) / (-2.0 * det); + + const double af1 = (xa - xm)*(xa - xm) + (ya - ym)*(ya - ym); + const double af2 = (xd - xm)*(xd - xm) + (yd - ym)*(yd - ym); + + if (af2 < af1) + { + // d is inside circumcircle — swap diagonal + i1 = j2; i2 = j4; i3 = j1; i4 = j3; + } + } +} + +// --------------------------------------------------------------------------- +// msho28 – Check whether any boundary point lies strictly inside triangle +// (i1, i2, i3) or triangle (i1, i2, (xn,yn)) when i3==0. +// +// coor i node coordinate array (interleaved flat) +// i1,i2 i first two nodes (1-based) +// i3 i third node (1-based); if 0 use (xn,yn) instead +// xn, yn i coordinates of virtual third vertex (used when i3==0) +// npoint i total node count +// itri i per-node boundary membership counter +// iperm o 1 = at least one interior point found; 0 = none +// --------------------------------------------------------------------------- +void msho28(std::span coor, + int i1, + int i2, + int i3, + double xn, + double yn, + int npoint, + std::span itri, + int& iperm, + const SepranContext& ctx) +{ + iperm = 1; + const double eps = 1.0e-2 * ctx.epsmac; + + const double x1 = coor[2 * (i1 - 1)], y1 = coor[2 * (i1 - 1) + 1]; + const double x2 = coor[2 * (i2 - 1)], y2 = coor[2 * (i2 - 1) + 1]; + double x3, y3; + if (i3 == 0) { x3 = xn; y3 = yn; } + else { x3 = coor[2*(i3-1)]; y3 = coor[2*(i3-1)+1]; } + + const double norm = std::abs(x1)+std::abs(x2)+std::abs(x3)+ + std::abs(y1)+std::abs(y2)+std::abs(y3); + const double det = x1*(y2-y3) + x2*(y3-y1) + x3*(y1-y2); + + for (int i = 1; i <= npoint; ++i) + { + if (i == i1 || i == i2 || i == i3 || itri[i - 1] == 0) continue; + + const double xm = coor[2 * (i - 1)]; + const double ym = coor[2 * (i - 1) + 1]; + + double opp = (x1*(y2 - ym) + x2*(ym - y1) + xm*(y1 - y2)) / det; + if (opp < -eps || opp > 1.0 + eps) continue; + + opp = (x2*(y3 - ym) + x3*(ym - y2) + xm*(y2 - y3)) / det; + if (opp < -eps || opp > 1.0 + eps) continue; + + opp = (x3*(y1 - ym) + x1*(ym - y3) + xm*(y3 - y1)) / det; + if (opp < -eps || opp > 1.0 + eps) continue; + + // Check for "double" point coinciding with corner i1 + double dist = std::abs(x1 - xm) + std::abs(y1 - ym); + if (dist < eps * norm) continue; + + dist = std::abs(x2 - xm) + std::abs(y2 - ym); + if (dist < eps * norm) continue; + + // Point i is strictly inside and not a double — found + return; // iperm == 1 + } + + iperm = 0; // no interior point found +} + +// --------------------------------------------------------------------------- +// msho29 – Remove internal nodes that have exactly 3 or 4 neighbours +// +// kelem i/o element array (flat triples) +// nelem i/o number of elements +// npoint i total node count +// iwork i CSR row-pointer array for ibuurp (length npoint) +// ibuurp i CSR adjacency list (ibuurp[iwork[i-2]..iwork[i-1]-1] for node i) +// nipnt i number of boundary nodes (indices 1..nipnt are fixed) +// coor i node coordinate array (interleaved flat) +// icancel i/o counter of cancelled points +// --------------------------------------------------------------------------- +void msho29(std::span kelem, + int& nelem, + int npoint, + std::span iwork, + std::span ibuurp, + int nipnt, + std::span coor, + int& icancel) +{ + icancel = 0; + + for (int i = nipnt + 1; i <= npoint; ++i) + { + const int prevPtr = (i > 1) ? iwork[i - 2] : 0; + const int np = iwork[i - 1] - prevPtr; + + if (np == 3) + { + const int ia = ibuurp[prevPtr]; + const int ib = ibuurp[prevPtr + 1]; + const int ic = ibuurp[prevPtr + 2]; + + icancel++; + + // Remove all triangles containing node i; keep the rest + int nel = 0; + for (int j = 0; j < nelem; ++j) + { + const int e1 = kelem[3*j], e2 = kelem[3*j+1], e3 = kelem[3*j+2]; + if (e1 != i && e2 != i && e3 != i) + { + kelem[3*nel] = e1; + kelem[3*nel+1] = e2; + kelem[3*nel+2] = e3; + nel++; + } + } + + // Add one new triangle ia-ib-ic (with correct orientation) + const double opp = triangleArea(coor, ia, ib, ic); + if (opp > 0.0) + { + kelem[3*nel] = ia; + kelem[3*nel+1] = ib; + kelem[3*nel+2] = ic; + } + else + { + kelem[3*nel] = ia; + kelem[3*nel+1] = ic; + kelem[3*nel+2] = ib; + } + nelem = nel + 1; + } + else if (np == 4) + { + // Read the 4 neighbours for the neighbour-check only + const int ia_nb = ibuurp[prevPtr]; + const int ib_nb = ibuurp[prevPtr + 1]; + const int ic_nb = ibuurp[prevPtr + 2]; + const int id_nb = ibuurp[prevPtr + 3]; + + // Skip if any neighbour itself has 3 neighbours, or a lower-index + // neighbour with 4 (would already have been removed) + auto neighbourCheck = [&](int nx) -> bool + { + if (nx <= nipnt) return false; + const int prevNx = (nx > 1) ? iwork[nx - 2] : 0; + const int iex = iwork[nx - 1] - prevNx; + return (iex == 3 || (nx < i && iex == 4)); + }; + + if (neighbourCheck(ia_nb) || neighbourCheck(ib_nb) || + neighbourCheck(ic_nb) || neighbourCheck(id_nb)) + continue; + + // Snapshot before compacting so we can roll back if ring is degenerate. + const int nelemBefore = nelem; + std::vector kelemBackup(3 * nelemBefore); + std::copy_n(kelem.begin(), 3 * nelemBefore, kelemBackup.begin()); + + icancel += 1000; + + // Direct Fortran translation: compact kelem removing triangles that + // contain node i, and simultaneously find ia,ib (first triangle) and + // ic,id ("opposite" triangle – the one sharing neither ia nor ib). + int ia = 0, ib = 0, ic = 0, id = 0; + int iex = 0; + int nel = 0; + + for (int j = 0; j < nelem; ++j) + { + const int e1 = kelem[3*j], e2 = kelem[3*j+1], e3 = kelem[3*j+2]; + + if (e1 != i && e2 != i && e3 != i) + { + kelem[3*nel] = e1; + kelem[3*nel+1] = e2; + kelem[3*nel+2] = e3; + nel++; + } + else + { + // The two ring nodes in this triangle (CCW relative order) + int n1, n2; + if (e1 == i) { n1 = e2; n2 = e3; } + else if (e2 == i) { n1 = e3; n2 = e1; } + else { n1 = e1; n2 = e2; } + + if (iex == 0) + { + ia = n1; ib = n2; + iex = 1; + } + else if (iex == 1) + { + // Accept the "opposite" triangle: neither ring node may + // equal ia or ib (direct translation of Fortran condition). + if (n1 != ia && n1 != ib && n2 != ia && n2 != ib) + { + ic = n1; id = n2; + iex = 2; + } + } + } + } + + // Degenerate ring: restore and skip (Fortran logs error but we skip). + if (ia == 0 || ib == 0 || ic == 0 || id == 0) + { + std::copy_n(kelemBackup.begin(), 3 * nelemBefore, kelem.begin()); + nelem = nelemBefore; + icancel -= 1000; + continue; + } + + // Choose best diagonal and write two new triangles (Fortran §msho27) + msho27(coor, ia, ib, id, ic, SepranContext{}); + + kelem[3*nel] = ia; + kelem[3*nel+1] = ib; + kelem[3*nel+2] = id; + nel++; + + kelem[3*nel] = ib; + kelem[3*nel+1] = ic; + kelem[3*nel+2] = id; + nel++; + + nelem = nel; + } + } +} + +// --------------------------------------------------------------------------- +// msho30 – Refill kstapl and itri after removing triangle ielem and its +// neighbours. Elements nelmfix+1..nelem that share a node with +// ielem are removed; the remaining ones are kept. +// +// kelem i/o element array (flat triples) +// nelem i/o number of elements +// ielem i 1-based index of central triangle to remove +// kstapl o rebuilt boundary edge list (flat pairs) +// kstap o number of edges in kstapl +// npoint i total node count +// itri o per-node boundary membership counter (rebuilt) +// nelmfix i number of elements that are fixed (indices 1..nelmfix) +// --------------------------------------------------------------------------- +void msho30(std::span kelem, + int& nelem, + int ielem, + std::span kstapl, + int& kstap, + int npoint, + std::span itri, + int nelmfix) +{ + const int ia = kelem[3 * (ielem - 1)]; + const int ib = kelem[3 * (ielem - 1) + 1]; + const int ic = kelem[3 * (ielem - 1) + 2]; + + kstap = 0; + int nextra = nelmfix; + + // Helper: add or cancel an edge in kstapl + // Adds edge (n1→n2); if reverse (n2→n1) already in kstapl it removes it. + auto addOrCancelEdge = [&](int n1, int n2) + { + // Handle Plaxis negative nodes: add directly + if (n1 <= -1 && n2 <= -1) + { + kstapl[2 * kstap] = n1; + kstapl[2 * kstap + 1] = n2; + kstap++; + return; + } + + // Check for reverse edge + int jtal = 0; + bool cancelled = false; + for (int is = 0; is < kstap; ++is) + { + const int j1 = kstapl[2 * is]; + const int j2 = kstapl[2 * is + 1]; + if (j1 == n2 && j2 == n1) + { + cancelled = true; // remove this edge (don't copy) + } + else + { + kstapl[2 * jtal] = j1; + kstapl[2 * jtal + 1] = j2; + jtal++; + } + } + kstap = jtal; + if (!cancelled) + { + kstapl[2 * kstap] = n1; + kstapl[2 * kstap + 1] = n2; + kstap++; + } + }; + + for (int i = nelmfix; i < nelem; ++i) // 0-based; Fortran: nelmfix+1..nelem + { + const int i1 = kelem[3 * i]; + const int i2 = kelem[3 * i + 1]; + const int i3 = kelem[3 * i + 2]; + + const bool shared = (i1 == ia || i1 == ib || i1 == ic || + i2 == ia || i2 == ib || i2 == ic || + i3 == ia || i3 == ib || i3 == ic); + + if (shared) + { + addOrCancelEdge(i1, i2); + addOrCancelEdge(i2, i3); + addOrCancelEdge(i3, i1); + } + else + { + // Keep this element in the nextra zone + kelem[3 * nextra] = i1; + kelem[3 * nextra + 1] = i2; + kelem[3 * nextra + 2] = i3; + nextra++; + } + } + nelem = nextra; + + // Rebuild itri from kstapl + for (int i = 0; i < npoint; ++i) itri[i] = 0; + for (int s = 0; s < kstap; ++s) + { + itri[kstapl[2*s] - 1]++; + itri[kstapl[2*s + 1] - 1]++; + } +} + +// --------------------------------------------------------------------------- +// msho33 – Triangle quality ratio: 2 * r_in / r_out +// +// coor i node coordinate array (interleaved flat) +// i1, i2, i3 i triangle nodes (1-based) +// ratio o quality measure in [0,1]; equilateral → 1 +// --------------------------------------------------------------------------- +void msho33(std::span coor, + double& ratio, + int i1, + int i2, + int i3) +{ + const double x1 = coor[2*(i1-1)], y1 = coor[2*(i1-1)+1]; + const double x2 = coor[2*(i2-1)], y2 = coor[2*(i2-1)+1]; + const double x3 = coor[2*(i3-1)], y3 = coor[2*(i3-1)+1]; + + const double s1 = std::sqrt((x2-x1)*(x2-x1) + (y2-y1)*(y2-y1)); + const double s2 = std::sqrt((x3-x2)*(x3-x2) + (y3-y2)*(y3-y2)); + const double s3 = std::sqrt((x1-x3)*(x1-x3) + (y1-y3)*(y1-y3)); + + const double s = 0.5 * (s1 + s2 + s3); + const double opp = std::sqrt(s * (s - s1) * (s - s2) * (s - s3)); + + const double ro = (s1 * s2 * s3) / (4.0 * opp); + const double ri = opp / s; + + ratio = 2.0 * ri / ro; +} + +// --------------------------------------------------------------------------- +// msho34 – Find the user-point indices ius1, ius2 of the start and end of +// the boundary curve on which node kpoint lies. +// +// kpoint i node with overly large coarseness (1-based) +// coor i node coordinate array (interleaved flat) +// ncurvs i number of internal curves +// curves i node counts per internal curve +// kbndpt i ordered boundary node array (all curves concatenated) +// nbndpt i length of kbndpt +// numcurvboun i number of boundary curves +// boundary i flat (2×(numcurvboun+...)) start/end indices into kbndpt +// boundary[2*(i-1)] = curve number, +// boundary[2*(i-1)+1] = start position in kbndpt +// nbound i number of nodes in boundary curves - 1 +// nholes i number of holes +// userco i user-specified coordinates (2-component interleaved) +// nuspnt i number of user points +// coaval i coarseness values (length nuspnt+1) +// ius1 o start user-point index (1-based) +// ius2 o end user-point index (1-based) +// --------------------------------------------------------------------------- +void msho34(int kpoint, + std::span coor, + int ncurvs, + std::span curves, + std::span kbndpt, + int nbndpt, + int numcurvboun, + std::span boundary, + int nbound, + int nholes, + std::span userco, + int nuspnt, + std::span coaval, + int& ius1, + int& ius2) +{ + (void)nbndpt; (void)coaval; // unused in this path + + const double xk = coor[2*(kpoint-1)]; + const double yk = coor[2*(kpoint-1)+1]; + (void)xk; (void)yk; + + bool found = false; + int bndStart = 0; // renamed from local 'istart' to avoid confusion + double xst = 9999.0, yst = 9999.0; + double xen = 9999.0, yen = 9999.0; + + int n2_prev = 0; // tracks n2 across loops for the internal-curves continuation + + // --- Search through boundary curves + for (int i = 1; i <= numcurvboun && !found; ++i) + { + int n1, n2; + if (i < numcurvboun) + { + // boundary(2,i) and boundary(2,i+1) in Fortran + n1 = boundary[2*(i-1) + 1]; + n2 = boundary[2*i + 1]; + } + else + { + n1 = boundary[2*(i-1) + 1]; + n2 = nbound + 1 + nholes; + } + + if (bndStart == 0) bndStart = kbndpt[n1 - 1]; // kbndpt(n1) 1-based + + if (n2 > n1 + 1 && kbndpt[n2 - 2] == bndStart) // kbndpt(n2-1) + { + n2 = n2 - 1; + bndStart = 0; + } + + for (int j = n1; j <= n2; ++j) + { + if (kpoint == kbndpt[j - 1]) // kbndpt(j) 1-based + { + xst = coor[2*(kbndpt[n1-1]-1)]; + yst = coor[2*(kbndpt[n1-1]-1)+1]; + xen = coor[2*(kbndpt[n2-1]-1)]; + yen = coor[2*(kbndpt[n2-1]-1)+1]; + found = true; + break; + } + } + n2_prev = n2; + } + + // --- If not found on boundary curves, search internal curves + for (int i = 1; i <= ncurvs && !found; ++i) + { + const int n1 = n2_prev + 1; + const int n2 = n1 + curves[i - 1] - 1; + + for (int j = n1; j <= n2; ++j) + { + if (kpoint == kbndpt[j - 1]) + { + xst = coor[2*(kbndpt[n1-1]-1)]; + yst = coor[2*(kbndpt[n1-1]-1)+1]; + xen = coor[2*(kbndpt[n2-1]-1)]; + yen = coor[2*(kbndpt[n2-1]-1)+1]; + found = true; + break; + } + } + n2_prev = n2; + } + + if (!found) + throw std::runtime_error("msho34: node kpoint not found on any curve"); + + // --- Map start/end coordinates to user-point indices + ius1 = 0; ius2 = 0; + for (int i = 1; i <= nuspnt; ++i) + { + const double xt = userco[2*(i-1)]; + const double yt = userco[2*(i-1)+1]; + + if (std::sqrt((xst-xt)*(xst-xt)+(yst-yt)*(yst-yt)) < 1.0e-8) ius1 = i; + if (std::sqrt((xen-xt)*(xen-xt)+(yen-yt)*(yen-yt)) < 1.0e-8) ius2 = i; + } +} + +// --------------------------------------------------------------------------- +// msho39 – Check whether coarsenesses cmin and cmax at two endpoints that +// are dist apart are geometrically compatible. +// +// cmax i/o coarseness at far end; may be reduced if not compatible +// cmin i coarseness at near end +// dist i Euclidean distance between the two points +// maxratio i maximum allowed ratio between successive element lengths +// iallow o 1 = compatible; 0 = cmax was adjusted +// --------------------------------------------------------------------------- +void msho39(double& cmax, + double cmin, + double dist, + double maxratio, + int& iallow) +{ + iallow = 1; + + if (dist < cmin) + { + iallow = 0; + cmax = dist; + } + else if (dist > cmin) + { + double afst = 0.6 * cmin; + double som = afst; + while (som < dist) + { + afst *= maxratio; + som += afst; + } + if (afst < 0.5 * cmax) + { + iallow = 0; + cmax = afst; + } + } +} + +// --------------------------------------------------------------------------- +// msho41 – Compute the maximum allowed coarseness cmax in point B given +// coarseness cmin in point A at Euclidean distance dist. +// +// cmin i coarseness at A +// cmax i/o i: user-given coarseness at B; o: adjusted max allowed +// dist i Euclidean distance A→B +// maxratio i maximum ratio between consecutive element lengths +// --------------------------------------------------------------------------- +void msho41(double cmin, + double& cmax, + double dist, + double maxratio) +{ + if (dist < cmin) + { + cmax = cmin; + } + else if (dist > cmin) + { + double afst = 0.65 * cmin; + double som = afst; + while (som < dist) + { + afst *= maxratio; + som += afst; + } + if (afst < cmax) cmax = afst; + } +} + +// --------------------------------------------------------------------------- +// msho42 – Check whether the line segment i→j is part of an internal boundary +// +// kbndpt i flat array of internal boundary pairs (node-pair sequence) +// lenbnd i length of kbndpt +// i i first node (1-based) +// j i second node (1-based) +// ja o 1 = i–j is an internal boundary segment; 0 = not +// --------------------------------------------------------------------------- +void msho42(std::span kbndpt, + int lenbnd, + int i, + int j, + int& ja) +{ + ja = 0; + for (int k = 0; k + 1 < lenbnd; k += 2) + { + const int ia = kbndpt[k]; + const int ib = kbndpt[k + 1]; + if ((ia == i && ib == j) || (ia == j && ib == i)) + { + ja = 1; + return; + } + } +} + +// --------------------------------------------------------------------------- +// msho75 (internal) – Check whether line segment (xi,yi)→(xj,yj) and +// segment (x1,y1)→(x2,y2) share an interior point. +// +// ih o 0 = common point exists; 1 = no common point +// --------------------------------------------------------------------------- +static void checkSegmentIntersection(double xi, + double yi, + double xj, + double yj, + double x1, + double y1, + double x2, + double y2, + int& ih, + const SepranContext& ctx) +{ + const double eps = 10.0 * ctx.epsmac; + ih = 1; // default: no intersection + + // Bounding-box pre-check + const double xmin = std::min(xi, xj), xmax = std::max(xi, xj); + const double ymin = std::min(yi, yj), ymax = std::max(yi, yj); + const double xmi = std::min(x1, x2), xma = std::max(x1, x2); + const double ymi = std::min(y1, y2), yma = std::max(y1, y2); + + if (xmi > xmax || xma < xmin || ymi > ymax || yma < ymin) return; + + const bool xiNeqXj = std::abs(xi - xj) > eps * (std::abs(xi) + std::abs(xj)); + const bool x1NeqX2 = std::abs(x1 - x2) > eps * (std::abs(x1) + std::abs(x2)); + + if (xiNeqXj) + { + if (x1NeqX2) + { + // General case: neither line is vertical + const double r1 = (y1*x2 - y2*x1) / (x2 - x1); + const double r2 = (yi*xj - yj*xi) / (xj - xi); + const double r3 = (yj - yi) / (xj - xi); + const double r4 = (y2 - y1) / (x2 - x1); + + if (std::abs(r3 - r4) > eps) + { + const double xs = (r1 - r2) / (r3 - r4); + const bool inIJ = (xi < xs && xj > xs) || (xj < xs && xi > xs) || + std::abs(xi - xs) < eps || std::abs(xj - xs) < eps; + const bool in12 = (x1 < xs && x2 > xs) || (x2 < xs && x1 > xs) || + std::abs(x1 - xs) < eps || std::abs(x2 - xs) < eps; + if (inIJ && in12) ih = 0; + } + } + else + { + // x1 == x2: line 1-2 is vertical, line i-j is not + if (std::abs(yi - yj) < eps) + { + // i-j is horizontal, 1-2 is vertical + const double xs = x1, ys = yi; + const bool ok = !((xi < xs && xj < xs) || (xi > xs && xj > xs) || + (y1 < ys && y2 < ys) || (y1 > ys && y2 > ys)); + if (ok) ih = 0; + } + else + { + // General vertical 1-2 case + const double ys = ((yj - yi) * x1 + yi * xj - yj * xi) / (xj - xi); + const bool in12 = (y1 < ys && y2 > ys) || (y2 < ys && y1 > ys) || + std::abs(y1 - ys) < eps || std::abs(y2 - ys) < eps; + const bool inIJ = (yi < ys && yj > ys) || (yj < ys && yi > ys) || + std::abs(yi - ys) < eps || std::abs(yj - ys) < eps; + if (in12 && inIJ) ih = 0; + } + } + } + else + { + // xi == xj: line i-j is vertical + if (x1NeqX2) + { + if (std::abs(y1 - y2) < eps) + { + // i-j vertical, 1-2 horizontal + const double xs = xi, ys = y1; + const bool ok = !((yi < ys && yj < ys) || (yi > ys && yj > ys) || + (x1 < xs && x2 < xs) || (x1 > xs && x2 > xs)); + if (ok) ih = 0; + } + else + { + const double ys = ((y2 - y1) * xi + y1*x2 - y2*x1) / (x2 - x1); + const bool inIJ = (yi < ys && yj > ys) || (yj < ys && yi > ys) || + std::abs(yi - ys) < eps || std::abs(yj - ys) < eps; + const bool in12 = (y1 < ys && y2 > ys) || (y2 < ys && y1 > ys) || + std::abs(y1 - ys) < eps || std::abs(y2 - ys) < eps; + if (inIJ && in12) ih = 0; + } + } + else + { + // Both lines are vertical + if (std::abs(x1 - xi) < eps * (std::abs(x1) + std::abs(xi))) ih = 0; + } + } +} + +// --------------------------------------------------------------------------- +// msho04 – Bounding box of all npoint nodes +// --------------------------------------------------------------------------- +void msho04(std::span coor, + int npoint, + double& xmin, double& xmax, + double& ymin, double& ymax, + const SepranContext& ctx) +{ + xmax = -ctx.rinfin; xmin = ctx.rinfin; + ymax = -ctx.rinfin; ymin = ctx.rinfin; + + for (int i = 0; i < npoint; ++i) + { + const double x = coor[2 * i]; + const double y = coor[2 * i + 1]; + xmin = std::min(xmin, x); xmax = std::max(xmax, x); + ymin = std::min(ymin, y); ymax = std::max(ymax, y); + } +} + +// --------------------------------------------------------------------------- +// msho05 – Extreme coarsenesses in dist array +// --------------------------------------------------------------------------- +void msho05(std::span dist, + int npoint, + double& dismin, double& dismax, + const SepranContext& ctx) +{ + const double eps = 10.0 * ctx.epsmac; + dismin = ctx.rinfin; + dismax = -ctx.rinfin; + + for (int i = 0; i < npoint; ++i) + { + const double d = dist[i]; + if (d > eps) { dismin = std::min(dismin, d); dismax = std::max(dismax, d); } + } +} + +// --------------------------------------------------------------------------- +// msho06 – Fill coarseness grid (cube/jcube) from boundary and internal data +// --------------------------------------------------------------------------- +void msho06(int npoint, + std::span coor, + double dist, double xstart, double ystart, + int nx, int ny, + std::span icube, + std::span chelp, + std::span cube, + std::span jcube, + std::span kbound, + int nbound, + std::span coar, + int ncoar, + int ncurvs, + std::span curves, + std::span cocurvs, + const SepranContext& ctx) +{ + const double eps = 10.0 * ctx.epsmac; + double coa = ctx.rinfin; + + // --- Assign each boundary node to a cube + for (int i = 0; i < npoint; ++i) + { + const double xp = coor[2 * i]; + const double yp = coor[2 * i + 1]; + const int n1 = static_cast((xp - xstart) / dist); + const int n2 = static_cast((yp - ystart) / dist); + const int nc = 1 + n1 + n2 * nx; + icube[i] = nc; + if (chelp[i] > eps && chelp[i] < coa) coa = chelp[i]; + } + + // --- Initialise cube coarsenesses: average chelp of nodes in each cube + for (int i = 0; i < nx * ny; ++i) { jcube[i] = 0; cube[i] = 0.0; } + + for (int i = 0; i < nx * ny; ++i) + { + int ntal = 0; + double coarse = 0.0; + for (int ik = 0; ik < npoint; ++ik) + { + if (chelp[ik] > eps && icube[ik] == i + 1) + { + ++ntal; + coarse += chelp[ik]; + } + } + if (ntal > 0) { cube[i] = coarse / ntal; jcube[i] = 1; } + } + + // --- Fill boundary-edge cubes along path of each edge + for (int e = 0; e < nbound; ++e) + { + const int i1 = kbound[2 * e]; + const int i2 = kbound[2 * e + 1]; + const double cgem = (chelp[i1 - 1] + chelp[i2 - 1]) * 0.5; + + const int n1i1 = static_cast((coor[2*(i1-1)] - xstart) / dist); + const int n2i1 = static_cast((coor[2*(i1-1)+1] - ystart) / dist); + const int n1i2 = static_cast((coor[2*(i2-1)] - xstart) / dist); + const int n2i2 = static_cast((coor[2*(i2-1)+1] - ystart) / dist); + + for (int n1 = std::min(n1i1,n1i2); n1 <= std::max(n1i1,n1i2); ++n1) + for (int n2 = std::min(n2i1,n2i2); n2 <= std::max(n2i1,n2i2); ++n2) + { + const int nc = 1 + n1 + n2 * nx; + if (cube[nc-1] < eps) { cube[nc-1] = cgem; jcube[nc-1] = 1; } + } + } + + // --- Internal curves + if (ncurvs > 0) + { + int nnodes = 0; + for (int i = 0; i < ncurvs; ++i) + { + for (int j = nnodes; j < nnodes + curves[i] - 1; ++j) + { + const double dx = cocurvs[2*(j+1)] - cocurvs[2*j]; + const double dy = cocurvs[2*(j+1)+1] - cocurvs[2*j+1]; + const double afst = std::sqrt(dx*dx + dy*dy); + const double xp = (cocurvs[2*(j+1)] + cocurvs[2*j]) * 0.5; + const double yp = (cocurvs[2*(j+1)+1] + cocurvs[2*j+1]) * 0.5; + const int n1 = static_cast((xp - xstart) / dist); + const int n2 = static_cast((yp - ystart) / dist); + const int nc = 1 + n1 + n2 * nx; + if (jcube[nc-1] == 0) { cube[nc-1] = afst; jcube[nc-1] = 1; } + else if (jcube[nc-1] > 0) { cube[nc-1] = (cube[nc-1] + afst) * 0.5; } + } + nnodes += curves[i]; + } + } + + // --- Extra coarseness points + for (int i = 0; i < ncoar; ++i) + { + const double xp = coar[3*i]; + const double yp = coar[3*i+1]; + const int n1 = static_cast((xp - xstart) / dist); + const int n2 = static_cast((yp - ystart) / dist); + const int nc = 1 + n1 + n2 * nx; + cube[nc-1] = coar[3*i+2]; + jcube[nc-1] = 1; + } + + // --- Interpolate empty interior cubes + for (int i = 1; i <= nx; ++i) + for (int j = 1; j <= ny; ++j) + { + const int nrkube = i + (j-1)*nx; + if (jcube[nrkube-1] != 0 || cube[nrkube-1] >= eps) continue; + + double coxmin = coa, coxmax = coa; + int ikxmin = 0, ikxmax = 0; + + for (int ik = (j-1)*nx + 1; ik < nrkube; ++ik) + if (jcube[ik-1]==1) { ikxmin = ik; coxmin = cube[ik-1]; } + for (int ik = j*nx; ik > nrkube; --ik) + if (jcube[ik-1]==1) { ikxmax = ik; coxmax = cube[ik-1]; break; } + + double coymin = coa, coymax = coa; + int ikymin = 0, ikymax = 0; + + for (int ik = i; ik < nrkube; ik += nx) + if (jcube[ik-1]==1) { ikymin = ik; coymin = cube[ik-1]; } + for (int ik = i + (ny-1)*nx; ik > nrkube; ik -= nx) + if (jcube[ik-1]==1) { ikymax = ik; coymax = cube[ik-1]; break; } + + double deel = 0.0, cox = 0.0, coy = 0.0; + const int jblokx = ikxmax * ikxmin; + if (jblokx != 0) + { + if (jblokx > 0) + { + const double alpha = std::pow(coxmax/coxmin, 1.0/(ikxmax-ikxmin)); + cox = coxmin * std::pow(alpha, static_cast(nrkube-ikxmin)); + } + else + { + const double alpha = (nrkube-ikxmin) * (1.0/(ikxmax-ikxmin)); + cox = coxmin + alpha * (coxmax-coxmin); + } + ++deel; + cube[nrkube-1] = cox; + } + + const int jbloky = ikymax * ikymin; + if (jbloky != 0) + { + if (jbloky > 0) + { + const double alpha = std::pow(coymax/coymin, + 1.0/(static_cast(ikymax-ikymin)/nx)); + coy = coymin * std::pow(alpha, static_cast(nrkube-ikymin)/nx); + } + else + { + const double alpha = (nrkube-ikymin) * (1.0/(ikymax-ikymin)); + coy = coymin + alpha * (coymax-coymin); + } + ++deel; + cube[nrkube-1] = (cube[nrkube-1] + coy) / deel; + } + + if (deel > 0.5) jcube[nrkube-1] = 2; + } + + // --- Fill empty cubes with a background value + double valmin = ctx.rinfin, valmax = 0.0; + for (int i = 0; i < nx*ny; ++i) + { + if (cube[i] > eps) { valmin = std::min(valmin,cube[i]); valmax = std::max(valmax,cube[i]); } + } + coa = (valmax + 3.0*valmin) / 4.0; + for (int i = 0; i < nx*ny; ++i) + if (cube[i] < valmin) cube[i] = coa; + + // --- Clamp: no cube may exceed 2.75× its minimum neighbour + bool changed = true; + while (changed && nx > 2 && ny > 2) + { + changed = false; + for (int i = nx-2; i >= 1; --i) + for (int j = ny-2; j >= 1; --j) + { + const int nrkube = i + j*nx; // 0-based + if (jcube[nrkube] != 2) continue; + const double vmin = std::min({cube[nrkube-nx], cube[nrkube-1], + cube[nrkube+1], cube[nrkube+nx]}); + if (cube[nrkube] > 2.75*vmin) { cube[nrkube] = 2.75*vmin; changed = true; } + } + } +} + +// --------------------------------------------------------------------------- +// msho07 – Point-in-polygon test via ray casting +// --------------------------------------------------------------------------- +void msho07(double xcub, double ycub, + double xmini, + std::span coor, + std::span kbound, + int nbound, + int& ja, + const SepranContext& ctx) +{ + const double xleft = xmini - 10.0; + const double yleft = ycub; + int isnij = 0; + ja = 0; + + for (int i = 0; i < nbound; ++i) + { + const int i1 = kbound[2 * i]; + const int i2 = kbound[2 * i + 1]; + + const double x1 = coor[2*(i1-1)], y1 = coor[2*(i1-1)+1]; + const double x2 = coor[2*(i2-1)], y2 = coor[2*(i2-1)+1]; + + const double xmin = std::min(x1,x2); + const double ymin = std::min(y1,y2); + const double ymax = std::max(y1,y2); + + if (xcub < xmin) continue; + if (ycub < ymin) continue; + if (ycub > ymax) continue; + + if (!segmentsIntersect(x1, y1, x2, y2, xleft, yleft, xcub, ycub, ctx)) + continue; + + ++isnij; + } + + if ((isnij % 2) != 0) ja = 1; +} + +// --------------------------------------------------------------------------- +// msho08 – Check and fix orientation of front edges +// --------------------------------------------------------------------------- +void msho08(std::span kstapl, + int kstap, + std::span coor, + double xstart, double dismin, + std::span holeinfo, + int nholes, + bool check, + SepranContext& ctx) +{ + constexpr double eps = 1.0e-5; + int icount = 0; + + for (int i = 0; i < kstap; ++i) + { + const int i1 = kstapl[2 * i]; + const int i2 = kstapl[2 * i + 1]; + + kstapl[2 * kstap + i] = 0; + + double e1, e2, xm, ym; + msho09(coor, i1, i2, e1, e2, xm, ym); + + double xn = xm + eps * e1 * dismin; + double yn = ym + eps * e2 * dismin; + + int ja = 0; + msho07(xn, yn, xstart, coor, kstapl.subspan(0, 2 * kstap), kstap, ja, ctx); + + if (ja == 0) + { + if (check) + { + ctx.ierror = 1; + throw std::runtime_error( + "msho08: boundary edge (" + std::to_string(i1) + "," + + std::to_string(i2) + ") has wrong orientation (error 2434)"); + } + std::swap(kstapl[2 * i], kstapl[2 * i + 1]); + } + + if (icount < nholes && holeinfo[2 * icount + 1] == i1) // holeinfo(2,icount) 1-based + { + if (ja == 0) holeinfo[2 * icount] = -holeinfo[2 * icount]; // negate + if (icount < nholes) ++icount; + } + + if (ja == 1) + { + xn = xm - eps * e1 * dismin; + yn = ym - eps * e2 * dismin; + ja = 0; + msho07(xn, yn, xstart, coor, kstapl.subspan(0, 2 * kstap), kstap, ja, ctx); + if (ja == 1) kstapl[2 * kstap + i] = 1; // double edge + } + } + + // --- Repair connectivity for double (internal) edges + int iloop = 0; + int ichange = 1; + + while (ichange == 1) + { + ichange = 0; + + for (int i = 0; i < kstap - 1; ++i) + { + if (kstapl[2 * kstap + i] != 0) continue; + + const int i1 = kstapl[2 * i]; + const int i2 = kstapl[2 * i + 1]; + + int ih1 = 1, ih2 = 1; + + for (int j = 0; j < kstap; ++j) + { + if (kstapl[2 * kstap + j] != 0 || j == i) continue; + const int j1 = kstapl[2 * j]; + const int j2 = kstapl[2 * j + 1]; + if (j1 == i2) ih2 = 0; + if (j2 == i1) ih1 = 0; + } + + if (ih1 + ih2 > 0) + { + for (int j = 0; j < kstap; ++j) + { + if (kstapl[2 * kstap + j] != 1) continue; + + const int j1 = kstapl[2 * j]; + const int j2 = kstapl[2 * j + 1]; + + if ((j1 == i2 && ih2 > 0) || (j2 == i1 && ih1 > 0)) + { + kstapl[2 * kstap + j] = 0; + ih1 = 0; ih2 = 0; + } + else if ((j1 == i1 && ih1 > 0) || (j2 == i2 && ih2 > 0)) + { + kstapl[2 * kstap + j] = 0; + std::swap(kstapl[2 * j], kstapl[2 * j + 1]); + ichange = 1; + ih1 = 0; ih2 = 0; + } + } + } + } + + ++iloop; + if (iloop > 1000) + { + ctx.ierror = 1; + throw std::runtime_error("msho08: internal error - failed to repair front connectivity (error 1274)"); + } + } + + checkStaple(kstapl.subspan(0, 2 * kstap), kstap, "Final check in msho08"); +} + +// --------------------------------------------------------------------------- +// msho15 – Commit new node and triangle; update kstapl and itri +// --------------------------------------------------------------------------- +void msho15(std::span coor, + int& npoint, + std::span kelem, + int& nelem, + std::span kstapl, + int& kstap, + std::span itri, + int i1, int i2, + double xnx, double yny) +{ + ++npoint; + coor[2 * (npoint - 1)] = xnx; + coor[2 * (npoint - 1) + 1] = yny; + + ++nelem; + kelem[3 * (nelem - 1)] = i1; + kelem[3 * (nelem - 1) + 1] = i2; + kelem[3 * (nelem - 1) + 2] = npoint; + + // Remove first edge (left-shift by one pair) + const int twoKstap = 2 * kstap; + for (int ib = 0; ib < twoKstap - 2; ++ib) + kstapl[ib] = kstapl[ib + 2]; + + const int base = twoKstap - 2; + ++kstap; + kstapl[base] = i1; + kstapl[base + 1] = npoint; + kstapl[base + 2] = npoint; + kstapl[base + 3] = i2; + + itri[npoint - 1] = 2; + ++itri[i1 - 1]; + ++itri[i2 - 1]; +} + +// --------------------------------------------------------------------------- +// msho16 – Build full CSR neighbour structure for all mesh nodes +// --------------------------------------------------------------------------- +void msho16(std::span kelem, + int nelem, int npoint, int nipnt, + std::span iwork, + std::span ibuurp, + int& leng, + SepranContext& ctx) +{ + // Count appearances per node in element array + for (int i = 0; i < npoint; ++i) iwork[i] = 0; + + for (int i = 0; i < nelem * 3; ++i) + iwork[kelem[i] - 1]++; // 1-based node index + + // Add 1 for every boundary node + for (int i = 0; i < nipnt; ++i) + iwork[i]++; + + // Convert to cumulative CSR pointers + int isum = 0; + for (int i = 0; i < npoint; ++i) + { + iwork[i] += isum; + isum = iwork[i]; + } + + if (isum > leng) + { + ctx.ierror = 1; + throw std::runtime_error("msho16: declared length of ibuurp is too small (error 903)"); + } + + for (int i = 0; i < isum; ++i) ibuurp[i] = 0; + leng = isum; + + // Fill ibuurp with unique neighbours + for (int i = 0; i < nelem; ++i) + { + const int is = 3 * i; + const int i1 = kelem[is]; + const int i2 = kelem[is + 1]; + const int i3 = kelem[is + 2]; + msho17(ibuurp, iwork, i1, i2); + msho17(ibuurp, iwork, i1, i3); + msho17(ibuurp, iwork, i2, i1); + msho17(ibuurp, iwork, i2, i3); + msho17(ibuurp, iwork, i3, i1); + msho17(ibuurp, iwork, i3, i2); + } +} + +// --------------------------------------------------------------------------- +// msho35 – Place fixed hexagonal clusters for user coarseness points. +// +// Translated from Fortran msho35 (SEPRAN, Niek Praagman, 2005-2008). +// For each special coarseness point in coar[], place the centre node plus +// 6 ring nodes in coor, then add 6 triangles and 6 front edges. +// --------------------------------------------------------------------------- +void msho35(int npoint, + std::span coor, + double xstart, + double ystart, + double dismax, + std::span coar, + int ncoar, + std::span icube, + int nx, + std::span kelem, + int& nelem, + std::span kstapl, + int& kstap, + std::span itri, + int isurnr, + std::span userpoints, + std::span kbndpt, + int& nbndpt, + SepranContext& ctx) +{ + const int npoin = npoint; + // npoint will be incremented as we add nodes; track via local counters + int np = npoint + ncoar; // centre nodes are placed at npoin+1 .. npoin+ncoar + + for (int i = 1; i <= ncoar; ++i) + { + if (ctx.ierror != 0) return; + + // --- Index of 6 ring nodes for coar-point i (0-based i here) + const int npoine = npoin + ncoar + (i - 1) * 6; + + const double dist = coar[3 * (i - 1) + 2]; + const double xp = coar[3 * (i - 1)]; + const double yp = coar[3 * (i - 1) + 1]; + const double eps = 1.0e-10 * dist; + + // --- Check point inside domain + int ja = 0; + msho07(xp + eps, yp + eps, xstart, coor, kstapl.subspan(0, 2 * kstap), kstap, ja, ctx); + + if (ja == 0) + { + ctx.ierror = 1; + throw std::runtime_error( + "msho35: user point " + std::to_string(userpoints[i - 1]) + + " (surface " + std::to_string(isurnr) + ") not inside region (error 1344)"); + } + + // --- Store centre node + nbndpt++; + kbndpt[nbndpt - 1] = npoin + i; + + coor[2 * (npoin + i - 1)] = xp; + coor[2 * (npoin + i - 1) + 1] = yp; + + const int n1 = static_cast((xp - xstart) / dismax); + const int n2 = static_cast((yp - ystart) / dismax); + icube[npoin + i - 1] = 1 + n1 + n2 * nx; + + // --- Six ring points: clockwise hexagon + const std::array offsets = { + -0.40, +0.67, +0.40, +0.67, -0.80, 0.0, + +0.80, 0.0, -0.40, -0.67, +0.40, -0.67 + }; + + for (int k = 0; k < 6; ++k) + { + const double xpoin = xp + offsets[2 * k] * dist; + const double ypoin = yp + offsets[2 * k + 1] * dist; + + ja = 0; + msho07(xpoin + eps, ypoin + eps, xstart, coor, + kstapl.subspan(0, 2 * kstap), kstap, ja, ctx); + + if (ja == 0) + { + ctx.ierror = 1; + throw std::runtime_error( + "msho35: user point " + std::to_string(userpoints[i - 1]) + + " (surface " + std::to_string(isurnr) + ") ring node " + + std::to_string(k + 1) + " outside region (error 1346)"); + } + + ++np; + coor[2 * (np - 1)] = xpoin; + coor[2 * (np - 1) + 1] = ypoin; + icube[np - 1] = 1 + n1 + n2 * nx; + } + + // --- Add 6 triangles (Fortran kelem is 1-based column-major, same node numbering) + // Ring order (1-based relative to npoine): 1,3,5,6,4,2 + const std::array ring = { npoine + 1, npoine + 3, npoine + 5, + npoine + 6, npoine + 4, npoine + 2 }; + const int centre = npoin + i; + + for (int k = 0; k < 6; ++k) + { + const int r1 = ring[k]; + const int r2 = ring[(k + 1) % 6]; + ++nelem; + kelem[3 * (nelem - 1)] = centre; + kelem[3 * (nelem - 1) + 1] = r1; + kelem[3 * (nelem - 1) + 2] = r2; + } + + // --- Adjust boundary array (6 new front edges = ring perimeter) + for (int k = 0; k < 6; ++k) + { + const int r1 = ring[k]; + const int r2 = ring[(k + 1) % 6]; + ++kstap; + kstapl[2 * (kstap - 1)] = r1; + kstapl[2 * (kstap - 1) + 1] = r2; + } + + for (int k = 0; k < 6; ++k) + itri[npoine + k] = 2; + } +} + +// --------------------------------------------------------------------------- +// msho36 – Register internal curve nodes into coor, kstapl, kbndpt. +// +// Translated from Fortran msho36 (SEPRAN, Niek Praagman, 2008-2009). +// --------------------------------------------------------------------------- +void msho36(std::span coor, + int& npoint, + int istep, + int ncurvs, + std::span curves, + std::span cocurvs, + std::span kstapl, + int& kstap, + std::span kbndpt, + int& nbndpt, + double coarsemin, + std::span extquanodes, + std::span coarse, + SepranContext& ctx) +{ + const double eps = 1.0e-6 * coarsemin; + int nnodes = 0; + int ibound = 1; // 1-based index into extquanodes (for quadratic) + + for (int i = 0; i < ncurvs; ++i) + { + if (ctx.ierror != 0) return; + + // Loop over edges of curve i (node indices are 0-based into cocurvs) + for (int j = nnodes; j < nnodes + curves[i] - 1; j += istep) + { + ++npoint; + ++nbndpt; + kbndpt[nbndpt - 1] = npoint; + + coor[2 * (npoint - 1)] = cocurvs[2 * j]; + coor[2 * (npoint - 1) + 1] = cocurvs[2 * j + 1]; + + const double x = cocurvs[2 * j]; + const double y = cocurvs[2 * j + 1]; + + const double dx = cocurvs[2 * (j + 1)] - x; + const double dy = cocurvs[2 * (j + 1) + 1] - y; + coarse[npoint - 1] = std::sqrt(dx * dx + dy * dy); + + // Check for coincidence with earlier node + int npn = 0; + for (int iext = 0; iext < npoint - 1; ++iext) + { + const double ddx = x - coor[2 * iext]; + const double ddy = y - coor[2 * iext + 1]; + if (std::sqrt(ddx * ddx + ddy * ddy) < eps && npn == 0) + { + npn = iext + 1; // 1-based + --npoint; + kbndpt[nbndpt - 1] = npn; + } + } + + // For quadratic: extra midpoint + if (istep == 2) + { + ++npoint; + ++nbndpt; + kbndpt[nbndpt - 1] = npoint; + coor[2 * (npoint - 1)] = cocurvs[2 * (j + 1)]; + coor[2 * (npoint - 1) + 1] = cocurvs[2 * (j + 1) + 1]; + } + + // Augment kstapl (front) in both directions + ++kstap; + if (npn > 0) + { + kstapl[2 * (kstap - 1)] = npn; + kstapl[2 * (kstap - 1) + 1] = npoint + 1; + ++kstap; + kstapl[2 * (kstap - 1)] = npoint + 1; + kstapl[2 * (kstap - 1) + 1] = npn; + + if (istep == 2) + { + extquanodes[ibound + 1] = npn; + extquanodes[ibound + 2] = npoint; + extquanodes[ibound + 3] = npoint + 1; + ibound += 3; + } + } + else + { + kstapl[2 * (kstap - 1)] = npoint + 1 - istep; + kstapl[2 * (kstap - 1) + 1] = npoint + 1; + ++kstap; + kstapl[2 * (kstap - 1)] = npoint + 1; + kstapl[2 * (kstap - 1) + 1] = npoint + 1 - istep; + + if (istep == 2) + { + extquanodes[ibound + 1] = npoint - 1; + extquanodes[ibound + 2] = npoint; + extquanodes[ibound + 3] = npoint + 1; + ibound += 3; + } + } + } + + // --- Last node of curve i + const int jlast = nnodes + curves[i] - 1; // 0-based + const double xlast = cocurvs[2 * jlast]; + const double ylast = cocurvs[2 * jlast + 1]; + + int npn = 0; + for (int iext = 0; iext < npoint - 1; ++iext) + { + const double ddx = xlast - coor[2 * iext]; + const double ddy = ylast - coor[2 * iext + 1]; + if (std::sqrt(ddx * ddx + ddy * ddy) < eps && npn == 0) + npn = iext + 1; // 1-based + } + + if (npn == 0) + { + ++npoint; + ++nbndpt; + kbndpt[nbndpt - 1] = npoint; + coor[2 * (npoint - 1)] = xlast; + coor[2 * (npoint - 1) + 1] = ylast; + + // Coarseness = distance from previous to last + const int jprev = jlast - 1; + const double dx = xlast - cocurvs[2 * jprev]; + const double dy = ylast - cocurvs[2 * jprev + 1]; + coarse[npoint - 1] = std::sqrt(dx * dx + dy * dy); + } + else + { + ++nbndpt; + kbndpt[nbndpt - 1] = npn; + + // Adjust last pair in kstapl: endpoint was written as npoint+1 + // but the real node is npn + kstapl[2 * (kstap - 1)] = npn; + kstapl[2 * (kstap - 2) + 1] = npn; + } + + nnodes += curves[i]; + } + + if (istep == 2 && !extquanodes.empty()) + extquanodes[0] = ibound; +} + +// --------------------------------------------------------------------------- +// msho38 – Check/adjust coarseness smoothness for all boundary and internal +// curves and user-specified coarseness points. +// +// Translated from Fortran msho38 (SEPRAN, Niek Praagman, 2009). +// --------------------------------------------------------------------------- +void msho38(int npoint, + std::span coor, + double dist, + double xstart, + double ystart, + std::span kbndpt, + int nbndpt, + int numcurvboun, + std::span boundary, + int nbound, + int nholes, + int nx, + int ny, + std::span icube, + std::span coarse, + std::span cube, + std::span jcube, + std::span kstapl, + int kstap, + int ncurvs, + std::span curves, + std::span cocurv, + int isurnr, + std::span userco, + int nuspnt, + std::span coaval, + double tran, + const SepranContext& ctx) +{ + (void)dist; (void)xstart; (void)ystart; + (void)nx; (void)ny; + (void)icube; (void)cube; (void)jcube; + (void)ncurvs; (void)cocurv; + (void)isurnr; + + const double eps = 1.0e-9 * coaval[0]; + + // maxratio stored in coaval[nuspnt+1] (0-based, matching coaval(nuspnt+2) Fortran) + const double maxratio = coaval[nuspnt + 1]; + const double csmall = [&]() + { + double v = ctx.rinfin; + for (int i = 0; i < nx * ny; ++i) + if (cube[i] < v && jcube[i] > 0) v = cube[i]; + return v; + }(); + + int iperm = 1; + (void)iperm; + + for (int i = 0; i < npoint - 1; ++i) + for (int j = i + 1; j < npoint; ++j) + { + if (coarse[i] <= eps || coarse[j] <= eps) continue; + + // Euclidean distance + const double afst = nodeDistance(i + 1, j + 1, coor); // 1-based + + double cmax, cmin; + int kpoint; + if (coarse[i] > coarse[j]) + { cmax = coarse[i]; cmin = coarse[j]; kpoint = i + 1; } + else + { cmax = coarse[j]; cmin = coarse[i]; kpoint = j + 1; } + + const double coa = std::abs((cmax - cmin) / (cmax + cmin)); + + if (afst < 0.2 * csmall) + { + int icheck = 0; + msho24(kstapl, kstap, coor, i + 1, j + 1, icheck, ctx); + if (icheck == 0) + { + int ius1 = 0, ius2 = 0; + msho34(kpoint, coor, ncurvs, curves, kbndpt, nbndpt, + numcurvboun, boundary, nbound, nholes, + userco, nuspnt, coaval, ius1, ius2); + // warning, no coaval adjustment for too-small distance + } + } + else if (coa > 0.1) + { + int iallow = 1; + msho39(cmax, cmin, afst, maxratio, iallow); + + int icheck = 0; + if (iallow == 0) + msho24(kstapl, kstap, coor, i + 1, j + 1, icheck, ctx); + + if (iallow == 0 && icheck == 0) + { + iperm = 0; + + msho41(cmin, cmax, afst, maxratio); + + int ius1 = 0, ius2 = 0; + msho34(kpoint, coor, ncurvs, curves, kbndpt, nbndpt, + numcurvboun, boundary, nbound, nholes, + userco, nuspnt, coaval, ius1, ius2); + + if (ius1 == 0 || ius2 == 0) continue; + + const double val1 = coaval[0] * coaval[ius1] / tran; + const double val2 = coaval[0] * coaval[ius2] / tran; + + if (cmax < val1 && cmax < val2) + { + coaval[ius1] = cmax * tran / coaval[0]; + coaval[ius2] = cmax * tran / coaval[0]; + } + else + { + const double x1 = userco[2 * (ius1 - 1)]; + const double y1 = userco[2 * (ius1 - 1) + 1]; + const double x2 = coor[2 * (kpoint - 1)]; + const double y2 = coor[2 * (kpoint - 1) + 1]; + const double x3 = userco[2 * (ius2 - 1)]; + const double y3 = userco[2 * (ius2 - 1) + 1]; + + const double af1 = std::sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)); + const double af2 = std::sqrt((x2-x3)*(x2-x3)+(y2-y3)*(y2-y3)); + double dif = val1 + af1 * (val2 - val1) / (af1 + af2) - cmax; + + double v1 = val1, v2 = val2; + if (v1 - dif < 0.5 * cmax) v1 = dif + 0.5 * cmax; + if (v2 - dif < 0.5 * cmax) v2 = dif + 0.5 * cmax; + + coaval[ius1] = tran / coaval[0] * (v1 - dif); + coaval[ius2] = tran / coaval[0] * (v2 - dif); + } + } + } + } +} + +// --------------------------------------------------------------------------- +// msho40 – Full mesh self-intersection check. +// +// Translated from Fortran msho40 (SEPRAN, Niek Praagman, 2009-2010). +// Returns iperm = 1 if intersections are found, 0 if clean. +// --------------------------------------------------------------------------- +void msho40(std::span coor, + std::span kelem, + int npoint, int nelem, + int& iperm) +{ + constexpr double eps = 1.0e-5; + iperm = 0; + + // --- Barycentre check: no barycentre of one triangle may lie inside another + for (int ie = 0; ie < nelem; ++ie) + { + const int i1 = kelem[3 * ie]; + const int i2 = kelem[3 * ie + 1]; + const int i3 = kelem[3 * ie + 2]; + + const double x1 = coor[2*(i1-1)], y1 = coor[2*(i1-1)+1]; + const double x2 = coor[2*(i2-1)], y2 = coor[2*(i2-1)+1]; + const double x3 = coor[2*(i3-1)], y3 = coor[2*(i3-1)+1]; + + const double xm = (x1 + x2 + x3) / 3.0; + const double ym = (y1 + y2 + y3) / 3.0; + + for (int je = 0; je < nelem; ++je) + { + if (je == ie) continue; + + const int j1 = kelem[3 * je]; + const int j2 = kelem[3 * je + 1]; + const int j3 = kelem[3 * je + 2]; + + const double a1 = coor[2*(j1-1)], b1 = coor[2*(j1-1)+1]; + const double a2 = coor[2*(j2-1)], b2 = coor[2*(j2-1)+1]; + const double a3 = coor[2*(j3-1)], b3 = coor[2*(j3-1)+1]; + + const double det = a1*(b2-b3) + a2*(b3-b1) + a3*(b1-b2); + if (std::abs(det) < eps * eps) continue; + + const double o1 = (a1*(b2-ym) + a2*(ym-b1) + xm*(b1-b2)) / det; + if (o1 < -eps || o1 > 1.0 + eps) continue; + const double o2 = (a2*(b3-ym) + a3*(ym-b2) + xm*(b2-b3)) / det; + if (o2 < -eps || o2 > 1.0 + eps) continue; + const double o3 = (a3*(b1-ym) + a1*(ym-b3) + xm*(b3-b1)) / det; + if (o3 < -eps || o3 > 1.0 + eps) continue; + + // Barycentre is inside triangle je + iperm = 1; + } + } + + if (iperm == 1) return; + + // --- Node check: no node may lie strictly inside a triangle + for (int i = 0; i < npoint; ++i) + { + const double xm = coor[2 * i]; + const double ym = coor[2 * i + 1]; + + for (int ie = 0; ie < nelem; ++ie) + { + const int i1 = kelem[3 * ie]; + const int i2 = kelem[3 * ie + 1]; + const int i3 = kelem[3 * ie + 2]; + + // Node is a vertex of this element – skip + if (i + 1 == i1 || i + 1 == i2 || i + 1 == i3) continue; + + const double x1 = coor[2*(i1-1)], y1 = coor[2*(i1-1)+1]; + const double x2 = coor[2*(i2-1)], y2 = coor[2*(i2-1)+1]; + const double x3 = coor[2*(i3-1)], y3 = coor[2*(i3-1)+1]; + + // Skip if node is numerically identical to a vertex (Plaxis double pts) + const double d1 = (x1-xm)*(x1-xm)+(y1-ym)*(y1-ym); + if (d1 < eps*(std::abs(x1)+std::abs(xm)+std::abs(y1)+std::abs(ym))) continue; + const double d2 = (x2-xm)*(x2-xm)+(y2-ym)*(y2-ym); + if (d2 < eps*(std::abs(x2)+std::abs(xm)+std::abs(y2)+std::abs(ym))) continue; + const double d3 = (x3-xm)*(x3-xm)+(y3-ym)*(y3-ym); + if (d3 < eps*(std::abs(x3)+std::abs(xm)+std::abs(y3)+std::abs(ym))) continue; + + const double det = x1*(y2-y3) + x2*(y3-y1) + x3*(y1-y2); + if (std::abs(det) < eps * eps) continue; + + const double o1 = (x1*(y2-ym) + x2*(ym-y1) + xm*(y1-y2)) / det; + if (o1 < -eps || o1 > 1.0 + eps) continue; + const double o2 = (x2*(y3-ym) + x3*(ym-y2) + xm*(y2-y3)) / det; + if (o2 < -eps || o2 > 1.0 + eps) continue; + const double o3 = (x3*(y1-ym) + x1*(ym-y3) + xm*(y3-y1)) / det; + if (o3 < -eps || o3 > 1.0 + eps) continue; + + iperm = 1; + } + + if (iperm == 1) return; + } +} + +} // namespace sepran diff --git a/extern/sepran/SepranFront.hpp b/extern/sepran/SepranFront.hpp new file mode 100644 index 000000000..2a3bde360 --- /dev/null +++ b/extern/sepran/SepranFront.hpp @@ -0,0 +1,410 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of msho01, msho09, msho11-msho14, msho17, msho20-msho21, +// msho24-msho30, msho33-msho35, msho36, msho38-msho42 +// from the SEPRAN library ("Ingenieursbureau SEPRA", Niek Praagman, 1989-2010). + +#pragma once + +#include "SepranContext.hpp" + +#include +#include + +namespace sepran +{ + +// --------------------------------------------------------------------------- +// Array/index conventions (used throughout this module): +// coor – interleaved flat: coor[2*(k-1)] = x, coor[2*(k-1)+1] = y (1-based k) +// kstapl – flat edge pairs: kstapl[2*s]=n1, kstapl[2*s+1]=n2 (0-based s) +// kelem – flat triples: kelem[3*e], [3*e+1], [3*e+2] (0-based e) +// itri – flat: itri[k-1] for 1-based node k +// istart – CSR: istart[i-1] = cumulative neighbour count through node i +// --------------------------------------------------------------------------- + +/// \brief Check boundary elements and fill per-node coarsenesses. +/// +/// Translated from Fortran \c msho01 (SEPRAN, Niek Praagman, 1989-2008). +void msho01(std::span kbound, + int nbound, + std::span istart, + std::span ibuur, + std::span coarse, + std::span coor, + int npoint, + double& coarsemin, + double& coarsemax, + std::span coar, + int ncoar, + SepranContext& ctx); + +/// \brief Compute the unit perpendicular and midpoint of segment i→j. +/// +/// Translated from Fortran \c msho09. +void msho09(std::span coor, + int i, int j, + double& e1, double& e2, + double& xm, double& ym); + +/// \brief Compute the cosine of the angle at vertex i2 between lines i2→i1 and i2→i3. +/// +/// Translated from Fortran \c msho11. +void msho11(int i1, int i2, int i3, + std::span coor, + double& angle, + const SepranContext& ctx); + +/// \brief Find the best adjacent front edges at the endpoints of base edge i1–i2. +/// +/// Translated from Fortran \c msho12. +void msho12(std::span coor, + std::span kstapl, + int kstap, + int i1, int i2, + int& iex1, int& iex2, + double& angle1, double& angle2, + SepranContext& ctx); + +/// \brief Check whether lines from i1 or i2 to new point (xn,yn) cross any front edge. +/// +/// Translated from Fortran \c msho13. +/// kdrie: 0=none, -1=ambiguous, >0 = 1-based index of crossing edge. +void msho13(std::span coor, + int i1, int i2, + int& kdrie, + std::span kstapl, + int kstap, + double xn, double yn, + const SepranContext& ctx); + +/// \brief Find the nearest front node to (xn,yn). +/// +/// Translated from Fortran \c msho14. +void msho14(std::span coor, + int& jpn, + int npoint, + std::span itri, + int i1, int i2, + double xn, double yn, + double& dista); + +/// \brief Commit a new node and triangle, update kstapl and itri. +/// +/// Translated from Fortran \c msho15. +void msho15(std::span coor, + int& npoint, + std::span kelem, + int& nelem, + std::span kstapl, + int& kstap, + std::span itri, + int i1, int i2, + double xnx, double yny); + +/// \brief Build the full CSR neighbour structure for all mesh nodes. +/// +/// Translated from Fortran \c msho16. +void msho16(std::span kelem, + int nelem, int npoint, int nipnt, + std::span iwork, + std::span ibuurp, + int& leng, + SepranContext& ctx); + +/// \brief Insert neighbour ij into the CSR neighbour list for node ih. +/// +/// Translated from Fortran \c msho17. +void msho17(std::span ibuurp, + std::span iwork, + int ih, int ij); + +/// \brief Rotate kstapl left by one edge (first edge moved to end) and update itri. +/// +/// Translated from Fortran \c msho20. +void msho20(std::span kstapl, + int kstap, + std::span itri); + +/// \brief Compute reference triangle-area values for each coarseness-grid cell. +/// +/// Translated from Fortran \c msho21. +void msho21(std::span cube, + int ncube, + std::span refvol); + +/// \brief Check whether segment i1–i2 crosses any front edge. +/// +/// Translated from Fortran \c msho24. +/// icheck: -1 = Plaxis duplicate coincidence; 0 = clear; >0 = crossing edge index. +void msho24(std::span kstapl, + int kstap, + std::span coor, + int i1, int i2, + int& icheck, + const SepranContext& ctx); + +/// \brief Move the shortest front edge to position 0 in kstapl. +/// +/// Translated from Fortran \c msho25. +void msho25(std::span kstapl, + int kstap, + std::span coor, + const SepranContext& ctx); + +/// \brief Find the triangle (other than jelem) sharing edge i2–i3. +/// +/// Translated from Fortran \c msho26. +void msho26(std::span kelem, + int nelem, + int i2, int i3, + int& jelem, + int& i4); + +/// \brief Select the best diagonal in quadrilateral (i1,i2,i3,i4) using Delaunay criterion. +/// +/// Translated from Fortran \c msho27. +void msho27(std::span coor, + int& i1, int& i2, int& i3, int& i4, + const SepranContext& ctx); + +/// \brief Check whether any front node lies strictly inside triangle (i1,i2,i3). +/// +/// Translated from Fortran \c msho28. +void msho28(std::span coor, + int i1, int i2, int i3, + double xn, double yn, + int npoint, + std::span itri, + int& iperm, + const SepranContext& ctx); + +/// \brief Remove over-refined interior nodes with 3 or 4 neighbours. +/// +/// Translated from Fortran \c msho29. +void msho29(std::span kelem, + int& nelem, + int npoint, + std::span iwork, + std::span ibuurp, + int nipnt, + std::span coor, + int& icancel); + +/// \brief Recover from triangulation error: remove ielem and rebuild front. +/// +/// Translated from Fortran \c msho30. +void msho30(std::span kelem, + int& nelem, + int ielem, + std::span kstapl, + int& kstap, + int npoint, + std::span itri, + int nelmfix); + +/// \brief Compute the triangle quality ratio 2·r_in/r_out. +/// +/// Translated from Fortran \c msho33. +void msho33(std::span coor, + double& ratio, + int i1, int i2, int i3); + +/// \brief Locate user-point curve endpoints for a given node. +/// +/// Translated from Fortran \c msho34. +void msho34(int kpoint, + std::span coor, + int ncurvs, + std::span curves, + std::span kbndpt, + int nbndpt, + int numcurvboun, + std::span boundary, + int nbound, + int nholes, + std::span userco, + int nuspnt, + std::span coaval, + int& ius1, + int& ius2); + +/// \brief Check coarseness compatibility and clamp cmax if transition is infeasible. +/// +/// Translated from Fortran \c msho39. +void msho39(double& cmax, + double cmin, + double dist, + double maxratio, + int& iallow); + +/// \brief Compute the maximum allowed coarseness over distance dist from cmin. +/// +/// Translated from Fortran \c msho41. +void msho41(double cmin, double& cmax, double dist, double maxratio); + +/// \brief Check whether edge i–j is an internal boundary segment. +/// +/// Translated from Fortran \c msho42. +void msho42(std::span kbndpt, + int lenbnd, + int i, int j, + int& ja); + +// --------------------------------------------------------------------------- +// Wrappers for msho04, msho05, msho06, msho07, msho08 – larger functions +// defined in SepranFront.cpp +// --------------------------------------------------------------------------- + +/// \brief Compute bounding box of npoint nodes. +/// +/// Translated from Fortran \c msho04. +void msho04(std::span coor, + int npoint, + double& xmin, double& xmax, + double& ymin, double& ymax, + const SepranContext& ctx); + +/// \brief Compute extreme coarsenesses. +/// +/// Translated from Fortran \c msho05. +void msho05(std::span dist, + int npoint, + double& dismin, double& dismax, + const SepranContext& ctx); + +/// \brief Determine per-quad coarsenesses and type flags. +/// +/// Translated from Fortran \c msho06. +void msho06(int npoint, + std::span coor, + double dist, double xstart, double ystart, + int nx, int ny, + std::span icube, + std::span chelp, + std::span cube, + std::span jcube, + std::span kbound, + int nbound, + std::span coar, + int ncoar, + int ncurvs, + std::span curves, + std::span cocurvs, + const SepranContext& ctx); + +/// \brief Point-in-polygon test (ray casting). +/// +/// Translated from Fortran \c msho07. +void msho07(double xcub, double ycub, + double xmini, + std::span coor, + std::span kbound, + int nbound, + int& ja, + const SepranContext& ctx); + +/// \brief Check and fix orientation of all front edges. +/// +/// Translated from Fortran \c msho08. +void msho08(std::span kstapl, + int kstap, + std::span coor, + double xstart, double dismin, + std::span holeinfo, + int nholes, + bool check, + SepranContext& ctx); + +/// \brief Place fixed hexagonal clusters for user coarseness points. +/// +/// Translated from Fortran \c msho35. +void msho35(int npoint, + std::span coor, + double xstart, double ystart, double dismax, + std::span coar, int ncoar, + std::span icube, int nx, + std::span kelem, int& nelem, + std::span kstapl, int& kstap, + std::span itri, + int isurnr, + std::span userpoints, + std::span kbndpt, int& nbndpt, + SepranContext& ctx); + +/// \brief Register internal curve nodes into coor, kstapl, kbndpt. +/// +/// Translated from Fortran \c msho36. +void msho36(std::span coor, + int& npoint, + int istep, int ncurvs, + std::span curves, + std::span cocurvs, + std::span kstapl, int& kstap, + std::span kbndpt, int& nbndpt, + double coarsemin, + std::span extquanodes, + std::span coarse, + SepranContext& ctx); + +/// \brief Check/adjust coarseness smoothness. +/// +/// Translated from Fortran \c msho38. +void msho38(int npoint, + std::span coor, + double dist, double xstart, double ystart, + std::span kbndpt, int nbndpt, + int numcurvboun, + std::span boundary, + int nbound, int nholes, + int nx, int ny, + std::span icube, + std::span coarse, + std::span cube, + std::span jcube, + std::span kstapl, int kstap, + int ncurvs, + std::span curves, + std::span cocurv, + int isurnr, + std::span userco, + int nuspnt, + std::span coaval, + double tran, + const SepranContext& ctx); + +/// \brief Full mesh self-intersection check. +/// +/// Translated from Fortran \c msho40. +/// iperm = 1 if intersections found, 0 if clean. +void msho40(std::span coor, + std::span kelem, + int npoint, int nelem, + int& iperm); + +} // namespace sepran diff --git a/extern/sepran/SepranGeometry.cpp b/extern/sepran/SepranGeometry.cpp new file mode 100644 index 000000000..a3775464e --- /dev/null +++ b/extern/sepran/SepranGeometry.cpp @@ -0,0 +1,229 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of mshcrossline.for, mshcrossline1.for, and msho75.for +// from the SEPRAN library. +// +// Original authors: +// mshcrossline – Guus Segal, 2000-2008 +// mshcrossline1 – Guus Segal, 2003 +// msho75 – Niek Praagman, 1996-2008 + +#include "SepranGeometry.hpp" + +#include +#include + +namespace sepran +{ + +// --------------------------------------------------------------------------- +// crossLine (mshcrossline.for) +// --------------------------------------------------------------------------- + +void crossLine(const std::array& x1, + const std::array& x2, + const std::array& x3, + const std::array& x4, + double& fact1, + double& fact2, + double eps, + const SepranContext& ctx) +{ + const double det = (x2[0] - x1[0]) * (x4[1] - x3[1]) + - (x4[0] - x3[0]) * (x2[1] - x1[1]); + + const double amax = std::max({std::abs(x1[0]), std::abs(x1[1]), + std::abs(x2[0]), std::abs(x2[1]), + std::abs(x3[0]), std::abs(x3[1]), + std::abs(x4[0]), std::abs(x4[1])}); + + if (std::abs(det) <= ctx.epsmac * amax * 100.0) + { + fact1 = -ctx.rinfin; + fact2 = -ctx.rinfin; + } + else + { + fact1 = ((x4[1] - x3[1]) * (x3[0] - x1[0]) + + (x3[0] - x4[0]) * (x3[1] - x1[1])) / det; + + if (fact1 >= -eps && fact1 <= 1.0 + eps) + { + fact2 = -((x1[1] - x2[1]) * (x3[0] - x1[0]) + + (x2[0] - x1[0]) * (x3[1] - x1[1])) / det; + } + else + { + fact2 = -ctx.rinfin; + } + } +} + +// --------------------------------------------------------------------------- +// crossLine1 (mshcrossline1.for) +// --------------------------------------------------------------------------- + +void crossLine1(const std::array& x1, + const std::array& x2, + const std::array& x3, + const std::array& x4, + double& fact1, + double& fact2, + double eps, + const SepranContext& ctx) +{ + fact1 = -ctx.rinfin; + fact2 = -ctx.rinfin; + + const double xmin1 = std::min(x1[0], x2[0]); + const double xmax1 = std::max(x1[0], x2[0]); + const double ymin1 = std::min(x1[1], x2[1]); + const double ymax1 = std::max(x1[1], x2[1]); + + const double xmin2 = std::min(x3[0], x4[0]); + const double xmax2 = std::max(x3[0], x4[0]); + const double ymin2 = std::min(x3[1], x4[1]); + const double ymax2 = std::max(x3[1], x4[1]); + + if (xmax1 < xmin2 - eps || xmin1 > xmax2 + eps || + ymax1 < ymin2 - eps || ymin1 > ymax2 + eps) + { + return; // Bounding boxes don't overlap — no intersection + } + + crossLine(x1, x2, x3, x4, fact1, fact2, eps, ctx); +} + +// --------------------------------------------------------------------------- +// segmentsIntersect (msho75.for) +// --------------------------------------------------------------------------- + +bool segmentsIntersect(double xi, double yi, + double xj, double yj, + double x1, double y1, + double x2, double y2, + const SepranContext& ctx) +{ + const double eps = 10.0 * ctx.epsmac; + + // Check bounding boxes first + const double xmin = std::min(xi, xj); + const double xmax = std::max(xi, xj); + const double ymin = std::min(yi, yj); + const double ymax = std::max(yi, yj); + + const double xmi = std::min(x1, x2); + const double xma = std::max(x1, x2); + const double ymi = std::min(y1, y2); + const double yma = std::max(y1, y2); + + if (xmi > xmax || xma < xmin || ymi > ymax || yma < ymin) + return false; // Boxes disjoint + + if (std::abs(xi - xj) > eps * (std::abs(xi) + std::abs(xj))) + { + // xi != xj + if (std::abs(x1 - x2) > eps * (std::abs(x1) + std::abs(x2))) + { + // xi!=xj, x1!=x2: determine x-coordinate of intersection + const double r1 = (y1 * x2 - y2 * x1) / (x2 - x1); + const double r2 = (yi * xj - yj * xi) / (xj - xi); + const double r3 = (yj - yi) / (xj - xi); + const double r4 = (y2 - y1) / (x2 - x1); + if (std::abs(r3 - r4) > eps) + { + const double xs = (r1 - r2) / (r3 - r4); + const bool onIJ = (xi < xs && xj > xs) || (xj < xs && xi > xs) + || std::abs(xi - xs) < eps || std::abs(xj - xs) < eps; + const bool on12 = (x1 < xs && x2 > xs) || (x2 < xs && x1 > xs) + || std::abs(x1 - xs) < eps || std::abs(x2 - xs) < eps; + if (onIJ && on12) + return true; + } + } + else + { + // x1 == x2: vertical line + if (std::abs(yi - yj) < eps) + { + // yi == yj as well + const double xs = x1; + const double ys = yi; + if (!((xi < xs && xj < xs) || (xi > xs && xj > xs) || + (y1 < ys && y2 < ys) || (y1 > ys && y2 > ys))) + return true; + } + else + { + const double ys = ((yj - yi) * x1 + yi * xj - yj * xi) / (xj - xi); + const bool on12 = (y1 < ys && y2 > ys) || (y2 < ys && y1 > ys) + || std::abs(y1 - ys) < eps || std::abs(y2 - ys) < eps; + const bool onIJ = (yi < ys && yj > ys) || (yj < ys && yi > ys) + || std::abs(yi - ys) < eps || std::abs(yj - ys) < eps; + if (on12 && onIJ) + return true; + } + } + } + else + { + // xi == xj: vertical line + if (std::abs(x1 - x2) > eps * (std::abs(x1) + std::abs(x2))) + { + // xi==xj, x1!=x2 + if (std::abs(y1 - y2) < eps) + { + const double xs = xi; + const double ys = y1; + if (!((yi < ys && yj < ys) || (yi > ys && yj > ys) || + (x1 < xs && x2 < xs) || (x1 > xs && x2 > xs))) + return true; + } + else + { + const double ys = ((y2 - y1) * xi + y1 * x2 - y2 * x1) / (x2 - x1); + const bool onIJ = (yi < ys && yj > ys) || (yi > ys && yj < ys) + || std::abs(yi - ys) < eps || std::abs(yj - ys) < eps; + const bool on12 = (y1 < ys && y2 > ys) || (y2 < ys && y1 > ys) + || std::abs(y1 - ys) < eps || std::abs(y2 - ys) < eps; + if (onIJ && on12) + return true; + } + } + else + { + // Both lines vertical (x1==x2 and xi==xj) + if (std::abs(x1 - xi) < eps * (std::abs(x1) + std::abs(xi))) + return true; + } + } + + return false; +} + +} // namespace sepran diff --git a/extern/sepran/SepranGeometry.hpp b/extern/sepran/SepranGeometry.hpp new file mode 100644 index 000000000..47d4df7ef --- /dev/null +++ b/extern/sepran/SepranGeometry.hpp @@ -0,0 +1,96 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of mshcrossline.for, mshcrossline1.for, and msho75.for +// from the SEPRAN library. + +#pragma once + +#include "SepranContext.hpp" + +#include + +namespace sepran +{ + +/// \brief Find the parametric intersection of the infinite lines x1–x2 and x3–x4. +/// +/// Translated from Fortran \c mshcrossline (SEPRAN, Guus Segal, 2000-2008). +/// +/// The intersection point on the first line is defined by x1 + fact1*(x2-x1). +/// The intersection point on the second line is defined by x3 + fact2*(x4-x3). +/// If the lines are (nearly) parallel, both facts are set to -ctx.rinfin. +/// +/// \param x1, x2 Endpoints of first line segment (2D coordinates). +/// \param x3, x4 Endpoints of second line segment (2D coordinates). +/// \param fact1 Output: parametric factor for x1–x2. +/// \param fact2 Output: parametric factor for x3–x4. +/// \param eps Local accuracy tolerance. +/// \param ctx SEPRAN context (reads ctx.epsmac, ctx.rinfin). +void crossLine(const std::array& x1, + const std::array& x2, + const std::array& x3, + const std::array& x4, + double& fact1, + double& fact2, + double eps, + const SepranContext& ctx); + +/// \brief Like crossLine, but first tests whether the bounding rectangles overlap. +/// +/// Translated from Fortran \c mshcrossline1 (SEPRAN, Guus Segal, 2003). +/// +/// If the bounding boxes of x1–x2 and x3–x4 do not overlap, both facts are +/// returned as -ctx.rinfin without calling the full intersection computation. +/// +/// \param x1, x2 Endpoints of first line segment. +/// \param x3, x4 Endpoints of second line segment. +/// \param fact1 Output: parametric factor for x1–x2. +/// \param fact2 Output: parametric factor for x3–x4. +/// \param eps Local accuracy tolerance. +/// \param ctx SEPRAN context. +void crossLine1(const std::array& x1, + const std::array& x2, + const std::array& x3, + const std::array& x4, + double& fact1, + double& fact2, + double eps, + const SepranContext& ctx); + +/// \brief Check whether line segment i–j and line segment 1–2 share a common point. +/// +/// Translated from Fortran \c msho75 (SEPRAN, Niek Praagman, 1996-2008). +/// +/// \return true if the two segments intersect (ih==0 in Fortran), false otherwise. +bool segmentsIntersect(double xi, double yi, + double xj, double yj, + double x1, double y1, + double x2, double y2, + const SepranContext& ctx); + +} // namespace sepran diff --git a/extern/sepran/SepranQuadratic.cpp b/extern/sepran/SepranQuadratic.cpp new file mode 100644 index 000000000..fa2ef7221 --- /dev/null +++ b/extern/sepran/SepranQuadratic.cpp @@ -0,0 +1,470 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of msho31.for, msho32.for, msh401-403/406/416 from SEPRAN. +// +// TRANSLATION CONVENTIONS: +// coor : coor[2*(k-1)] = x, coor[2*(k-1)+1] = y (1-based k) +// kelem : flat, kelem[3*e], [3*e+1], [3*e+2] (0-based e, 1-based nodes) +// kbound : kbound[2*e], kbound[2*e+1] (0-based e, 1-based nodes) + +#include "SepranQuadratic.hpp" +#include "SepranContext.hpp" + +#include +#include +#include +#include +#include +#include + +namespace sepran +{ + +// --------------------------------------------------------------------------- +// Internal helpers (translated from msh402, msh403, msh406, msh416) +// --------------------------------------------------------------------------- + +/// msh416 – Diagonal endpoints of quadrilateral i1-i2-i3-i4. +/// Returns (ie,it) where ie=min, it=max of the chosen diagonal. +static void msh416(int i1, int i2, int i3, int i4, int& ie, int& it) +{ + const int im = std::min({i1, i2, i3, i4}); + if (im == i1 || im == i3) { ie = std::min(i1,i3); it = std::max(i1,i3); } + else { ie = std::min(i2,i4); it = std::max(i2,i4); } +} + +/// msh402 – Store the pair (ilow,ihigh) in the neighbour arrays. +/// +/// istart[ihigh-1] is a count of neighbours stored so far when ja==1 +/// (the "fill" phase); when ja==0 (the "query" phase after compaction), +/// istart holds CSR start addresses. +/// +/// kelemh[0] is the count of overflow entries; overflow pairs are stored +/// from kelemh[2] onward as (ihigh, ilow) pairs. +static void msh402(int npoint, + int ibrp, + std::span ibrpnt, + std::span istart, + int i1, int i2, + std::span kelemh, + SepranContext& ctx) +{ + int ja; + if (i1 < 0) { ja = 0; i1 = -i1; } + else { ja = 1; } + + // Determine low and high node numbers + int ilow, ihigh; + if (i1 > i2) + { + if (i1 > npoint) { ilow = i1; ihigh = i2; } + else { ilow = i2; ihigh = i1; } + } + else + { + if (i2 > npoint) { ilow = i2; ihigh = i1; } + else { ilow = i1; ihigh = i2; } + } + + int jstart, jstend; + if (ja == 1) + { + jstart = ibrp * (ihigh - 1); // 0-based index + jstend = jstart + ibrp - 1; + } + else + { + jstart = istart[ihigh - 1] - 1; // 0-based + jstend = istart[ihigh] - 2; // 0-based + } + + for (;;) + { + const int ih = ibrpnt[jstart]; + + if (ih == 0) + { + // empty slot – store here + ibrpnt[jstart] = ilow; + if (ja == 1) istart[ihigh - 1]++; + return; + } + + if (ih == ilow) return; // already stored + + ++jstart; + + if (jstart > jstend) + { + if (ja == 0) + { + ctx.ierror = 1; + throw std::runtime_error("msh402: no place left for neighbour (error 1274)"); + } + + // Overflow: use kelemh + int j = kelemh[0]; + // Check if already in kelemh + for (int il = 0; il < j; ++il) + { + if (std::abs(kelemh[2*(il+1)] - ihigh) == 0 && + std::abs(kelemh[2*(il+1)+1] - ilow ) == 0) + return; + } + kelemh[2 * (j + 1)] = ihigh; + kelemh[2 * (j + 1) + 1] = ilow; + kelemh[0] = j + 1; + istart[ihigh - 1]++; + return; + } + } +} + +/// msh403 – Find the mid-side node between i1 and i3 in ibrpnt. +static void msh403(int npoint, int i1, int i3, + std::span ibrpnt, + std::span istart, + int& i2, + SepranContext& ctx) +{ + i2 = 0; + + int ilow, ihigh; + if (i1 > i3) + { + if (i1 > npoint) { ilow = i1; ihigh = i3; } + else { ilow = i3; ihigh = i1; } + } + else + { + if (i3 > npoint) { ilow = i3; ihigh = i1; } + else { ilow = i1; ihigh = i3; } + } + + int jstart = istart[ihigh - 1] - 1; // 0-based + const int jstend = istart[ihigh] - 2; // 0-based + + while (jstart <= jstend) + { + if (ibrpnt[jstart] == ilow) + { + i2 = ibrpnt[jstart + 1]; + return; + } + jstart += 2; + } + + // Not found + ctx.ierror = 1; + throw std::runtime_error("msh403: intermediate neighbour not found (error 949)"); +} + +/// msh406 – Write 6 node numbers into a quadratic-triangle element. +/// kelem layout: flat, 6 entries per element (0-based element j). +static void msh406(std::span kelem, int j, + int i1, int i2, int i3, int i4, int i5, int i6) +{ + const int base = 6 * j; + kelem[base + 0] = i1; + kelem[base + 1] = i2; + kelem[base + 2] = i3; + kelem[base + 3] = i4; + kelem[base + 4] = i5; + kelem[base + 5] = i6; +} + +/// msh401 – Fill neighbour arrays for all linear triangles (ishape=3). +static void msh401(int npoint, + std::span kmeshc, + int nelem, + std::span istart, + int ibrp, + std::span ibrpnt, + std::span kelemh, + SepranContext& ctx) +{ + for (int ielem = 0; ielem < nelem; ++ielem) + { + const int base = 3 * ielem; + const int n1 = kmeshc[base]; + const int n2 = kmeshc[base + 1]; + const int n3 = kmeshc[base + 2]; + + msh402(npoint, ibrp, ibrpnt, istart, n1, n2, kelemh, ctx); + msh402(npoint, ibrp, ibrpnt, istart, n2, n3, kelemh, ctx); + msh402(npoint, ibrp, ibrpnt, istart, n3, n1, kelemh, ctx); + if (ctx.ierror != 0) return; + } +} + +// --------------------------------------------------------------------------- +// msho31 – Linear to quadratic triangles +// --------------------------------------------------------------------------- +void msho31(std::span coor, + int& npoint, + std::span kelem, + int nelem, + std::span kbound, + int nbn, + std::span extquanodes, + SepranContext& ctx) +{ + const int ibrp = 10; + const int ibrlen = ibrp * (npoint + 1); + + std::vector istart (npoint + 2, 0); + std::vector ibrpnt (ibrlen, 0); + std::vector kelemh (npoint + 2, 0); + + // --- Fill neighbour graph + msh401(npoint, kelem, nelem, istart, ibrp, ibrpnt, kelemh, ctx); + if (ctx.ierror != 0) return; + + // --- Compact: collect all non-zero neighbours into a contiguous prefix + int nummer = 0; + for (int i = 0; i < npoint; ++i) + { + const int jstart = ibrp * i; + const int jstend = jstart + ibrp; + for (int ii = jstart; ii < jstend; ++ii) + { + if (ibrpnt[ii] != 0) + { + ibrpnt[nummer] = ibrpnt[ii]; + ++nummer; + } + } + } + const int itotalCompact = nummer; + + if (ibrlen < 2 * itotalCompact) + { + ctx.ierror = 1; + throw std::runtime_error( + "msho31: not enough space for neighbours (error 1275). Need " + + std::to_string(2 * itotalCompact) + ", have " + std::to_string(ibrlen)); + } + + // --- Shift to upper half of ibrpnt and rebuild istart as CSR pointers + int npt = ibrlen - 1; // 0-based end + nummer = itotalCompact - 1; + int iextra = 0; + + for (int i = npoint - 1; i >= 0; --i) + { + int nbr = istart[i]; + + if (nbr > ibrp) + { + iextra = 1; + for (int ib = 0; ib < nbr - ibrp; ++ib) + { + ibrpnt[npt] = 0; + --npt; + } + nbr = ibrp; + } + + for (int ib = 0; ib < nbr; ++ib) + { + ibrpnt[npt] = ibrpnt[nummer]; + --npt; + --nummer; + } + + if (npt < nummer) + { + ctx.ierror = 1; + throw std::runtime_error("msho31: too few positions in ibrpnt (error 1274)"); + } + } + + // Account for extra neighbours in kelemh + int itotal = itotalCompact; + if (kelemh[0] != 0) + { + if (iextra == 0) + { + ctx.ierror = 1; + throw std::runtime_error("msho31: extra points not recognised (error 1274)"); + } + itotal = kelemh[0] + itotalCompact; + for (int i = 0; i < kelemh[0]; ++i) + { + const int ia = -kelemh[2*(i+1)]; // negative flag for msh402 + const int ib = kelemh[2*(i+1) + 1]; + msh402(npoint, ibrp, ibrpnt, istart, ia, ib, kelemh, ctx); + if (ctx.ierror != 0) return; + } + } + + if (ibrlen < 2 * itotal) + { + ctx.ierror = 1; + throw std::runtime_error("msho31: not enough space for neighbours (error 1275)"); + } + + // --- Convert istart to proper CSR pointers + itotal = istart[npoint] - 1; // total edges + int jstend = 0; + for (int i = 0; i < npoint; ++i) + { + const int jstart = jstend + 1; + jstend += istart[i]; + istart[i] = jstart; + } + istart[npoint] = jstend + 1; + + // --- Expand: shift pairs to make room for new-node slot + // ibrpnt[2*k-2] = neighbour, ibrpnt[2*k-1] = midnode (initially 0) + for (int i = itotal; i >= 1; --i) + { + ibrpnt[2 * i - 1] = 0; + ibrpnt[2 * i - 2] = ibrpnt[i - 1 + npt + 1]; // reindex from compacted region + } + + // Adjust istart to 2-based offsets + for (int i = 1; i <= npoint; ++i) + istart[i] = 2 * istart[i] - 1; // 1-based Fortran style; adjust for 0-based below + + // Actually, let's do this cleanly: offset all istart so [i-1] points correctly + // istart is still 1-based internally; convert to 0-based access: + // We'll use a lambda to abstract the conversion. + + // --- Reuse existing mid-side nodes on boundary + for (int i = 0; i < nbn; ++i) + { + int ip1 = kbound[2 * i]; + int ip2 = kbound[2 * i + 1]; + int ip3 = ip1 + 1; // pre-existing midpoint assumed to be ip1+1 + + // larger node is "ihigh" + if (ip1 < ip2) { std::swap(ip1, ip2); } + + const int js = istart[ip1 - 1] - 1; // 0-based + const int jse = istart[ip1] - 2; // 0-based + for (int ii = js; ii <= jse; ii += 2) + { + if (ibrpnt[ii] == ip2) + { + ibrpnt[ii + 1] = ip3; + break; + } + } + } + + // --- Reuse existing mid-side nodes on internal quadratic lines + if (!extquanodes.empty() && extquanodes[0] > 1) + { + const int ileng = (extquanodes[0] - 1) / 3; + for (int i = 0; i < ileng; ++i) + { + int ip1 = extquanodes[3 * i + 1]; // start node + int ip2 = extquanodes[3 * i + 3]; // end node + int ip3 = extquanodes[3 * i + 2]; // mid node + + if (ip1 < ip2) { std::swap(ip1, ip2); } + + const int js = istart[ip1 - 1] - 1; + const int jse = istart[ip1] - 2; + for (int ii = js; ii <= jse; ii += 2) + { + if (ibrpnt[ii] == ip2) + { + ibrpnt[ii + 1] = ip3; + break; + } + } + } + } + + // --- Create new mid-side nodes for all internal edges + const int npnold = npoint; + for (int i = 0; i < npnold; ++i) + { + const int jstart_i = istart[i] - 1; // 0-based + const int jstend_i = istart[i + 1] - 2; + for (int ii = jstart_i; ii <= jstend_i; ii += 2) + { + const int ip2 = ibrpnt[ii]; + const int ip3 = ibrpnt[ii + 1]; + + if (ip2 > 0 && ip3 == 0) + { + ++npoint; + ibrpnt[ii + 1] = npoint; + + // Midpoint coordinates (1-based node indices) + coor[2 * (npoint - 1)] = (coor[2 * i] + coor[2 * (ip2 - 1)]) / 2.0; + coor[2 * (npoint - 1) + 1] = (coor[2 * i + 1] + coor[2 * (ip2 - 1) + 1]) / 2.0; + } + } + } + + // --- Build quadratic elements (backward so we don't clobber linear data) + // The input kelem has 3 entries per element; we need 6. + // Process backward: fill kelem[6*(i-1)..6*i-1] from kelem[3*(i-1)..3*i-1] + for (int i = nelem - 1; i >= 0; --i) + { + int ip[7] = {}; + ip[1] = kelem[3 * i]; + ip[3] = kelem[3 * i + 1]; + ip[5] = kelem[3 * i + 2]; + + msh403(npnold, ip[1], ip[3], ibrpnt, istart, ip[2], ctx); + msh403(npnold, ip[3], ip[5], ibrpnt, istart, ip[4], ctx); + msh403(npnold, ip[5], ip[1], ibrpnt, istart, ip[6], ctx); + if (ctx.ierror != 0) return; + + msh406(kelem, i, ip[1], ip[2], ip[3], ip[4], ip[5], ip[6]); + } +} + +// --------------------------------------------------------------------------- +// msho32 – Recover linear triangles from quadratic element array +// --------------------------------------------------------------------------- +void msho32(std::span kelem, + int nelem, + int inpelm, + int& npunt) +{ + for (int i = 0; i < nelem; ++i) + { + const int lin = 3 * i; + const int qua = inpelm * i; + kelem[lin] = kelem[qua]; + kelem[lin + 1] = kelem[qua + 2]; + kelem[lin + 2] = kelem[qua + 4]; + } + + npunt = 0; + for (int i = 0; i < 3 * nelem; ++i) + if (kelem[i] > npunt) npunt = kelem[i]; +} + +} // namespace sepran diff --git a/extern/sepran/SepranQuadratic.hpp b/extern/sepran/SepranQuadratic.hpp new file mode 100644 index 000000000..e11418874 --- /dev/null +++ b/extern/sepran/SepranQuadratic.hpp @@ -0,0 +1,86 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of msho31.for, msho32.for, msh401.for, msh402.for, +// msh403.for, msh406.for, msh416.for from the SEPRAN library. + +#pragma once + +#include "SepranContext.hpp" + +#include + +namespace sepran +{ + +/// \brief Convert linear triangle mesh to quadratic (6-node) triangles. +/// +/// Translated from Fortran \c msho31 (SEPRAN, Niek Praagman, 1990-2010). +/// +/// New mid-side nodes are added to \p coor; \p kelem is expanded from +/// 3 to 6 nodes per element. Already-existing mid-side nodes on the +/// boundary (given in \p kbound) and on internal quadratic lines +/// (\p extquanodes) are reused. +/// +/// On entry \p kelem holds 3 node-indices per element (flat, 0-based element, +/// 1-based node values). On exit it holds 6 node-indices per element +/// (must be pre-allocated to at least 6*nelem entries). +/// +/// \param coor i/o Interleaved coords (extended in place). +/// \param npoint i/o Node count (extended). +/// \param kelem i/o Element connectivity array. +/// \param nelem i Number of linear triangles. +/// \param kbound i Flat boundary-edge pairs (1-based), length 2*nbn. +/// \param nbn i Number of boundary edges. +/// \param extquanodes i Quadratic-internal-line data (from msho36). +/// \param ctx i/o SEPRAN context. +void msho31(std::span coor, + int& npoint, + std::span kelem, + int nelem, + std::span kbound, + int nbn, + std::span extquanodes, + SepranContext& ctx); + +/// \brief Recover linear triangles from a quadratic element array. +/// +/// Translated from Fortran \c msho32 (SEPRAN, Niek Praagman, 1991-2005). +/// +/// Squashes \p kelem from \p inpelm nodes per element to 3, retaining only +/// vertices 1, 3, 5 (0-based positions 0, 2, 4) per element. +/// +/// \param kelem i/o Element array (inpelm*nelem entries; overwritten with 3*nelem). +/// \param nelem i Number of elements. +/// \param inpelm i Nodes per quadratic element (typically 6). +/// \param npunt o Highest node number in the resulting linear mesh. +void msho32(std::span kelem, + int nelem, + int inpelm, + int& npunt); + +} // namespace sepran diff --git a/extern/sepran/SepranSort.cpp b/extern/sepran/SepranSort.cpp new file mode 100644 index 000000000..8c7355396 --- /dev/null +++ b/extern/sepran/SepranSort.cpp @@ -0,0 +1,108 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of chsort.for from the SEPRAN library. +// +// Original Fortran: chsort (programmer Jos van Kan / Onno Hoitinga, 1987-1998) +// Numerical-Recipes heap sort algorithm (Cambridge University Press, 1989). + +#include "SepranSort.hpp" + +#include +#include +#include + +namespace sepran +{ + +void heapSort(std::span keysrt, std::span kgrad) +{ + const int n = static_cast(keysrt.size()); + assert(kgrad.size() == keysrt.size()); + + // Initialise permutation to identity (Fortran: do j=1,npoint kgrad(j)=j) + std::iota(kgrad.begin(), kgrad.end(), 0); + + if (n <= 1) + return; + + // Heap sort — direct translation of the Fortran, converted to 0-based indices. + // The Fortran algorithm works on a 1-based kgrad array; here every index is + // decremented by 1. + int l = n / 2; // Fortran: l = npoint/2+1, then l=l-1 on first entry → same + int ir = n - 1; // Fortran: ir = npoint (0-based: n-1) + + while (true) + { + int kgradt; + int q; + + if (l > 0) + { + --l; + kgradt = kgrad[l]; + q = keysrt[kgradt]; + } + else + { + kgradt = kgrad[ir]; + q = keysrt[kgradt]; + kgrad[ir] = kgrad[0]; + --ir; + if (ir == 0) + { + kgrad[0] = kgradt; + return; + } + } + + int i = l; + int j = l + l + 1; // Fortran j = l+l, but kgrad is 0-based → j = 2*l+1 + + while (j <= ir) + { + if (j < ir) + { + if (keysrt[kgrad[j]] < keysrt[kgrad[j + 1]]) + ++j; + } + if (q < keysrt[kgrad[j]]) + { + kgrad[i] = kgrad[j]; + i = j; + j = j + j + 1; + } + else + { + break; + } + } + kgrad[i] = kgradt; + } +} + +} // namespace sepran diff --git a/extern/sepran/SepranSort.hpp b/extern/sepran/SepranSort.hpp new file mode 100644 index 000000000..363257bda --- /dev/null +++ b/extern/sepran/SepranSort.hpp @@ -0,0 +1,46 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of chsort.for from the SEPRAN library. + +#pragma once + +#include + +namespace sepran +{ + +/// \brief Compute a permutation index that sorts keysrt in ascending order. +/// +/// Translated from Fortran \c chsort (SEPRAN library, Numerical-Recipes heap sort). +/// +/// \param keysrt Integer sort keys (0-based, length n). +/// \param kgrad Output permutation: kgrad[i] is the 0-based index of the +/// i-th element in sorted order. Must be the same size as keysrt. +void heapSort(std::span keysrt, std::span kgrad); + +} // namespace sepran diff --git a/extern/sepran/SepranTopology.cpp b/extern/sepran/SepranTopology.cpp new file mode 100644 index 000000000..7a4f986ad --- /dev/null +++ b/extern/sepran/SepranTopology.cpp @@ -0,0 +1,325 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of msho02, msho03, msho10, msho18, msho19, msho22 +// from the SEPRAN library. +// +// Original author: Niek Praagman, 1989-2010. + +#include "SepranTopology.hpp" + +#include +#include + +namespace sepran +{ + +// --------------------------------------------------------------------------- +// insertNeighbour (msho02.for) +// --------------------------------------------------------------------------- + +void insertNeighbour(std::span istart, + std::span ibuur, + int i, + int j) +{ + // Range of neighbour slots for node i (1-based i) + const int ist = (i == 1) ? 0 : istart[i - 2]; // 0-based start + const int ien = istart[i - 1]; // exclusive end + + for (int kn = ist; kn < ien; ++kn) + { + const int ib = ibuur[kn]; + if (ib == 0) + { + ibuur[kn] = j; + return; + } + if (ib == j) + return; // Already present — double line, do nothing + } +} + +// --------------------------------------------------------------------------- +// nodeDistance (msho03.for) +// --------------------------------------------------------------------------- + +double nodeDistance(int i, int j, std::span coor) +{ + const double dx = coor[2 * (i - 1)] - coor[2 * (j - 1)]; + const double dy = coor[2 * (i - 1) + 1] - coor[2 * (j - 1) + 1]; + return std::sqrt(dx * dx + dy * dy); +} + +// --------------------------------------------------------------------------- +// addElement (msho10.for) +// --------------------------------------------------------------------------- + +void addElement(std::span kelem, int& nelem, + int i1, int i2, int jpn, + std::span kstapl, int& kstap, + std::span itri) +{ + // Append the new element + kelem[3 * nelem] = i1; + kelem[3 * nelem + 1] = i2; + kelem[3 * nelem + 2] = jpn; + ++nelem; + + // Walk through kstapl (skip slot 0 — Fortran starts at index 2) + // Remove edges i2-jpn and jpn-i1 if present; otherwise they are new. + int idrie = 0; // Number of surviving edges + int ieen = 1; // 1 = edge jpn-i2 is new (needs adding) + int itwe = 1; // 1 = edge i1-jpn is new (needs adding) + + for (int ks = 1; ks < kstap; ++ks) // Fortran: do ks = 2, kstap + { + const int ia = kstapl[2 * ks]; + const int ib = kstapl[2 * ks + 1]; + if (ia == i2 && ib == jpn) + { + ieen = 0; + } + else if (ia == jpn && ib == i1) + { + itwe = 0; + } + else + { + kstapl[2 * idrie] = ia; + kstapl[2 * idrie + 1] = ib; + ++idrie; + } + } + + if (ieen == 1) + { + kstapl[2 * idrie] = jpn; + kstapl[2 * idrie + 1] = i2; + ++idrie; + ++itri[i2 - 1]; + ++itri[jpn - 1]; + } + else + { + --itri[i2 - 1]; + --itri[jpn - 1]; + } + + if (itwe == 1) + { + kstapl[2 * idrie] = i1; + kstapl[2 * idrie + 1] = jpn; + ++idrie; + ++itri[jpn - 1]; + ++itri[i1 - 1]; + } + else + { + --itri[jpn - 1]; + --itri[i1 - 1]; + } + + kstap = idrie; +} + +// --------------------------------------------------------------------------- +// triangleArea (msho19.for) +// --------------------------------------------------------------------------- + +double triangleArea(std::span coor, int i1, int i2, int i3) +{ + const double x1 = coor[2 * (i1 - 1)]; + const double y1 = coor[2 * (i1 - 1) + 1]; + const double x2 = coor[2 * (i2 - 1)]; + const double y2 = coor[2 * (i2 - 1) + 1]; + const double x3 = coor[2 * (i3 - 1)]; + const double y3 = coor[2 * (i3 - 1) + 1]; + return (x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0; +} + +// --------------------------------------------------------------------------- +// checkTriangleAngles (msho22.for) +// --------------------------------------------------------------------------- + +int checkTriangleAngles(double a, double b, double c) +{ + const double aa = a * a; + const double bb = b * b; + const double cc = c * c; + + constexpr double q = -0.01; + + const double angle1 = (cc + aa - bb) / (2.0 * c * a); + const double angle2 = (aa + bb - cc) / (2.0 * a * b); + const double angle3 = (bb + cc - aa) / (2.0 * b * c); + + if (angle1 < q) return 1; + else if (angle2 < q) return 2; + else if (angle3 < q) return 3; + return 0; +} + +// --------------------------------------------------------------------------- +// laplacianSmoothing (msho18.for) +// --------------------------------------------------------------------------- + +void laplacianSmoothing(std::span kelem, int nelem, + std::span coor, int npoint, int nipnt, + std::span iwork, + std::span ibuurp, + double& coars, + SepranContext& ctx) +{ + coars = 0.02 * coars; + + int jr = 1; + bool finished = false; + + while (!finished) + { + ++jr; + double afstnd = 0.0; + + for (int ikn = nipnt + 1; ikn <= npoint; ++ikn) // 1-based node index + { + // Compute total surface of all elements containing ikn + double surf = 0.0; + double surf1 = 0.0; + + const double xh = coor[2 * (ikn - 1)]; + const double yh = coor[2 * (ikn - 1) + 1]; + + for (int i = 0; i < nelem; ++i) + { + const int ia = kelem[3 * i]; + const int ib = kelem[3 * i + 1]; + const int ic = kelem[3 * i + 2]; + if (ia == ikn || ib == ikn || ic == ikn) + { + surf1 = triangleArea(coor, ia, ib, ic); + surf += surf1; + } + } + + const double surfre = surf; + + // CSR start/end for node ikn + const int jstart = (ikn == 1) ? 0 : iwork[ikn - 2]; + const int jeind = iwork[ikn - 1]; + + if (jstart >= jeind) + continue; + + // Compute barycentre of neighbours + double xz = 0.0; + double yz = 0.0; + int nbuur = jeind - jstart; + + for (int i = jstart; i < jeind; ++i) + { + const int jkn = ibuurp[i]; + if (jkn > 0) + { + xz += coor[2 * (jkn - 1)]; + yz += coor[2 * (jkn - 1) + 1]; + } + else + { + --nbuur; + } + } + xz /= nbuur; + yz /= nbuur; + + // Try over-relaxed move + const double xn = xh + 1.62 * (xz - xh); + const double yn = yh + 1.62 * (yz - yh); + + coor[2 * (ikn - 1)] = xn; + coor[2 * (ikn - 1) + 1] = yn; + + // Recompute surface and check validity + surf = 0.0; + for (int i = 0; i < nelem; ++i) + { + const int ia = kelem[3 * i]; + const int ib = kelem[3 * i + 1]; + const int ic = kelem[3 * i + 2]; + if (ia == ikn || ib == ikn || ic == ikn) + { + surf1 = triangleArea(coor, ia, ib, ic); + surf += std::abs(surf1); + } + } + + int iallow = 0; + if (std::abs(surf - surfre) < 100.0 * ctx.epsmac) + iallow = 2; + + if (iallow != 2) + { + // Over-relaxation not accepted — try barycentre + coor[2 * (ikn - 1)] = xz; + coor[2 * (ikn - 1) + 1] = yz; + + surf = 0.0; + for (int i = 0; i < nelem; ++i) + { + const int ia = kelem[3 * i]; + const int ib = kelem[3 * i + 1]; + const int ic = kelem[3 * i + 2]; + if (ia == ikn || ib == ikn || ic == ikn) + { + surf1 = triangleArea(coor, ia, ib, ic); + surf += surf1; + } + } + if (std::abs(surf - surfre) < 100.0 * ctx.epsmac) + iallow = 1; + + if (iallow == 0) + { + // Neither move is valid — restore old position + coor[2 * (ikn - 1)] = xh; + coor[2 * (ikn - 1) + 1] = yh; + } + } + + // Track maximum displacement + const double cx = coor[2 * (ikn - 1)]; + const double cy = coor[2 * (ikn - 1) + 1]; + const double af = (xh - cx) * (xh - cx) + (yh - cy) * (yh - cy); + if (af > afstnd) afstnd = af; + } + + if (jr > 2 && std::sqrt(afstnd) < coars) finished = true; + if (jr == 20) finished = true; + } +} + +} // namespace sepran diff --git a/extern/sepran/SepranTopology.hpp b/extern/sepran/SepranTopology.hpp new file mode 100644 index 000000000..052f54b3c --- /dev/null +++ b/extern/sepran/SepranTopology.hpp @@ -0,0 +1,154 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of msho02, msho03, msho10, msho18, msho19, msho22 +// from the SEPRAN library. + +#pragma once + +#include "SepranContext.hpp" + +#include + +namespace sepran +{ + +// --------------------------------------------------------------------------- +// Array conventions used throughout sepran topology: +// +// coor – interleaved flat: coor[2*(k-1)] = x, coor[2*(k-1)+1] = y +// k is a 1-based node index. +// +// istart – CSR row-pointer array of length npoint. +// istart[i-1] (1-based i) = total number of neighbours for nodes 1..i. +// Neighbours of node i are at ibuur[istart[i-2] .. istart[i-1]-1] +// (with istart[-1] := 0). +// +// ibuur – CSR adjacency list; ibuur[j] is the 1-based node index of a +// neighbour. +// +// kelem – element (triangle) array, flat: kelem[3*e], kelem[3*e+1], +// kelem[3*e+2] are the 1-based node indices of element e (0-based e). +// +// kstapl – advancing-front edge list, flat pairs: kstapl[2*k]=n1, +// kstapl[2*k+1]=n2 (1-based node indices), k is 0-based. +// +// itri – per-node front-membership counter; itri[k-1] for 1-based node k. +// --------------------------------------------------------------------------- + +/// \brief Insert neighbour j into the CSR adjacency list of node i. +/// +/// Translated from Fortran \c msho02 (SEPRAN, Niek Praagman, 1989-1997). +/// +/// \param istart CSR row-pointer array (length npoint, 1-based nodes). +/// \param ibuur CSR adjacency list (pre-allocated). +/// \param i Source node (1-based). +/// \param j Neighbour node to insert (1-based). +void insertNeighbour(std::span istart, + std::span ibuur, + int i, + int j); + +/// \brief Compute the Euclidean distance between two nodes. +/// +/// Translated from Fortran \c msho03 (SEPRAN, Niek Praagman, 1989-1994). +/// +/// \param i First node (1-based). +/// \param j Second node (1-based). +/// \param coor Node coordinate array. +/// \return Euclidean distance ||node_i - node_j||. +double nodeDistance(int i, int j, std::span coor); + +/// \brief Add a new triangle element and update the advancing-front arrays. +/// +/// Translated from Fortran \c msho10 (SEPRAN, Niek Praagman, 1989-2003). +/// +/// Appends element (i1, i2, jpn) to \p kelem, removes edges i2-jpn and +/// jpn-i1 from \p kstapl if they were already on the front, or adds them if +/// not, and updates \p itri accordingly. +/// +/// \param kelem Element array (flat, 3 entries per element). Must be +/// pre-allocated to maximum capacity. +/// \param nelem Current element count (in-out). +/// \param i1 First node of new triangle (1-based). +/// \param i2 Second node of new triangle (1-based). +/// \param jpn Third node of new triangle (1-based). +/// \param kstapl Advancing-front edge list (flat pairs, 1-based nodes). +/// \param kstap Current length of kstapl (number of edges) (in-out). +/// \param itri Per-node front-membership counter (1-based index − 1). +void addElement(std::span kelem, int& nelem, + int i1, int i2, int jpn, + std::span kstapl, int& kstap, + std::span itri); + +/// \brief Compute the signed area of triangle (i1, i2, i3). +/// +/// Translated from Fortran \c msho19 (SEPRAN, Niek Praagman, 1989-2005). +/// +/// Returns a positive value for counter-clockwise orientation. +/// +/// \param coor Node coordinate array. +/// \param i1, i2, i3 Node indices (1-based). +/// \return Signed area = ((x1*(y2-y3)+x2*(y3-y1)+x3*(y1-y2)) / 2). +double triangleArea(std::span coor, int i1, int i2, int i3); + +/// \brief Check triangle angles; return which angle (if any) exceeds 90°. +/// +/// Translated from Fortran \c msho22 (SEPRAN, Niek Praagman, 1989-2010). +/// +/// \param a Length of side a. +/// \param b Length of side b. +/// \param c Length of side c. +/// \return 0 if all angles ≤ 90°; 1/2/3 indicating which vertex has the +/// obtuse angle. +int checkTriangleAngles(double a, double b, double c); + +/// \brief Laplacian smoothing of interior nodes. +/// +/// Translated from Fortran \c msho18 (SEPRAN, Niek Praagman, 1989-2010). +/// +/// Iteratively moves interior nodes (indices nipnt+1 .. npoint, 1-based) +/// toward the barycentre of their neighbours, accepting moves that preserve +/// positive triangle areas. +/// +/// \param kelem Element array (flat, 3 entries per element). +/// \param nelem Number of elements. +/// \param coor Node coordinate array (in-out). +/// \param npoint Total node count. +/// \param nipnt Number of boundary (fixed) nodes (1-based indices 1..nipnt). +/// \param iwork CSR row-pointer array for ibuurp (length npoint). +/// \param ibuurp CSR adjacency list of all nodes (length iwork[npoint-1]). +/// \param coars Reference coarseness / stopping distance (in-out; halved inside). +/// \param ctx SEPRAN context. +void laplacianSmoothing(std::span kelem, int nelem, + std::span coor, int npoint, int nipnt, + std::span iwork, + std::span ibuurp, + double& coars, + SepranContext& ctx); + +} // namespace sepran diff --git a/extern/sepran/SepranTransform.cpp b/extern/sepran/SepranTransform.cpp new file mode 100644 index 000000000..1224f7d07 --- /dev/null +++ b/extern/sepran/SepranTransform.cpp @@ -0,0 +1,124 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of mshtrans2dsur.for from the SEPRAN library. +// +// Original author: Guus Segal, 2009. + +#include "SepranTransform.hpp" + +#include +#include + +namespace sepran +{ + +TransformParams transform2DSurface(std::span coor, + int npoint, + std::span coar, + int ncoar, + std::span curves, + int ncurvs, + std::span cocurvs, + std::span userco, + int nuspnt, + SepranContext& ctx) +{ + if (ctx.ierror != 0) + return {}; + + // --- Find bounding box of all boundary nodes --- + double xmint = ctx.rinfin; + double xmax = -ctx.rinfin; + double ymint = ctx.rinfin; + double ymax = -ctx.rinfin; + + for (int i = 0; i < npoint; ++i) + { + xmint = std::min(xmint, coor[2 * i]); + xmax = std::max(xmax, coor[2 * i]); + ymint = std::min(ymint, coor[2 * i + 1]); + ymax = std::max(ymax, coor[2 * i + 1]); + } + + // --- Choose uniform scale factor --- + const double tran = (xmax - xmint > ymax - ymint) ? (xmax - xmint) : (ymax - ymint); + + // --- Scale boundary node coordinates --- + for (int i = 0; i < npoint; ++i) + { + coor[2 * i] = 1.0 + (coor[2 * i] - xmint) / tran; + coor[2 * i + 1] = 1.0 + (coor[2 * i + 1] - ymint) / tran; + } + + // --- Scale user points --- + for (int i = 0; i < nuspnt; ++i) + { + userco[2 * i] = 1.0 + (userco[2 * i] - xmint) / tran; + userco[2 * i + 1] = 1.0 + (userco[2 * i + 1] - ymint) / tran; + } + + // --- Scale internal coarseness points --- + // coar layout: [x0,y0,c0, x1,y1,c1, ...] (0-based) + for (int i = 0; i < ncoar; ++i) + { + coar[3 * i] = 1.0 + (coar[3 * i] - xmint) / tran; + coar[3 * i + 1] = 1.0 + (coar[3 * i + 1] - ymint) / tran; + coar[3 * i + 2] /= tran; // scale the coarseness value itself + } + + // --- Scale internal curve nodes --- + // curves[i] = node count of curve i (0-based). + // cocurvs stores all curve nodes concatenated, interleaved x,y. + if (ncurvs > 0) + { + int offset = 0; + for (int i = 0; i < ncurvs; ++i) + { + const int nnodes = curves[i]; + for (int k = 0; k < nnodes; ++k) + { + cocurvs[2 * (offset + k)] = 1.0 + (cocurvs[2 * (offset + k)] - xmint) / tran; + cocurvs[2 * (offset + k) + 1] = 1.0 + (cocurvs[2 * (offset + k) + 1] - ymint) / tran; + } + offset += nnodes; + } + } + + return {xmint, ymint, tran}; +} + +void reverseTransform2DSurface(std::span coor, int npoint, const TransformParams& tp) +{ + for (int i = 0; i < npoint; ++i) + { + coor[2 * i] = tp.xmint + (coor[2 * i] - 1.0) * tp.tran; + coor[2 * i + 1] = tp.ymint + (coor[2 * i + 1] - 1.0) * tp.tran; + } +} + +} // namespace sepran diff --git a/extern/sepran/SepranTransform.hpp b/extern/sepran/SepranTransform.hpp new file mode 100644 index 000000000..4c5a5f041 --- /dev/null +++ b/extern/sepran/SepranTransform.hpp @@ -0,0 +1,95 @@ +//----- AGPL -------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2017-2026. +// +// This programme is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as +// published by the Free Software Foundation version 3. +// +// This programme is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with This programme. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D", +// "D-Flow Flexible Mesh" and "Deltares" are registered trademarks of Stichting +// Deltares, and remain the property of Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------- +// +// C++20 translation of mshtrans2dsur.for from the SEPRAN library. + +#pragma once + +#include "SepranContext.hpp" + +#include + +namespace sepran +{ + +/// \brief Parameters computed by the 2D coordinate normalisation step. +struct TransformParams +{ + double xmint; ///< X translation (minimum x before scaling). + double ymint; ///< Y translation (minimum y before scaling). + double tran; ///< Scale factor (maximum extent in either dimension). +}; + +/// \brief Normalise coordinates so the domain fits in the first quadrant with +/// unit extent. +/// +/// Translated from Fortran \c mshtrans2dsur (SEPRAN, Guus Segal, 2009). +/// +/// All coordinate arrays are modified in-place. After the call, every +/// coordinate c becomes 1 + (c - cmin) / tran. +/// +/// Array conventions (shared with the rest of sepran): +/// - \p coor: interleaved flat [x0,y0, x1,y1, ...], 0-based, length 2*npoint. +/// - \p coar: flat [x0,y0,coarseness0, x1,y1,coarseness1, ...], length 3*ncoar. +/// - \p cocurvs: interleaved flat, length 2 * total_curve_nodes. +/// - \p userco: interleaved flat, length 2*nuspnt. +/// - \p curves: node counts per internal curve, length ncurvs. +/// +/// \param coor Node coordinates to normalise (in-out). +/// \param npoint Number of nodes in coor. +/// \param coar Internal-point coordinate + coarseness array (in-out). +/// \param ncoar Number of entries in coar. +/// \param curves Node count per internal curve (length ncurvs). +/// \param ncurvs Number of internal curves. +/// \param cocurvs Coordinates of nodes on internal curves (in-out). +/// \param userco User-prescribed node coordinates (in-out), length 2*nuspnt. +/// \param nuspnt Number of user points. +/// \param ctx SEPRAN context. +/// \return TransformParams with xmint, ymint and tran. +TransformParams transform2DSurface(std::span coor, + int npoint, + std::span coar, + int ncoar, + std::span curves, + int ncurvs, + std::span cocurvs, + std::span userco, + int nuspnt, + SepranContext& ctx); + +/// \brief Reverse the transformation applied by transform2DSurface. +/// +/// Applies the inverse: c_orig = xmint + (c_scaled - 1) * tran. +/// +/// \param coor Node coordinate array to reverse-transform (in-out). +/// \param npoint Number of nodes. +/// \param tp Parameters returned by transform2DSurface. +void reverseTransform2DSurface(std::span coor, + int npoint, + const TransformParams& tp); + +} // namespace sepran diff --git a/libs/MeshKernel/CMakeLists.txt b/libs/MeshKernel/CMakeLists.txt index 8ad32b061..2fb3902ad 100644 --- a/libs/MeshKernel/CMakeLists.txt +++ b/libs/MeshKernel/CMakeLists.txt @@ -80,6 +80,7 @@ set( ${SRC_DIR}/SplitRowColumnOfMesh.cpp ${SRC_DIR}/TriangulationInterpolation.cpp ${SRC_DIR}/TriangulationWrapper.cpp + ${SRC_DIR}/TriangulationGenerator.cpp ) set( @@ -222,6 +223,7 @@ set( ${DOMAIN_INC_DIR}/SplitRowColumnOfMesh.hpp ${DOMAIN_INC_DIR}/TriangulationInterpolation.hpp ${DOMAIN_INC_DIR}/TriangulationWrapper.hpp + ${DOMAIN_INC_DIR}/TriangulationGenerator.hpp ${DOMAIN_INC_DIR}/Vector.hpp ) @@ -348,6 +350,7 @@ find_package(OpenMP REQUIRED) target_link_libraries( ${TARGET_NAME} LINK_PUBLIC + Sepran Triangle OpenMP::OpenMP_CXX Eigen3::Eigen diff --git a/libs/MeshKernel/include/MeshKernel/PolygonalEnclosure.hpp b/libs/MeshKernel/include/MeshKernel/PolygonalEnclosure.hpp index 9e44e9688..f2dc0a765 100644 --- a/libs/MeshKernel/include/MeshKernel/PolygonalEnclosure.hpp +++ b/libs/MeshKernel/include/MeshKernel/PolygonalEnclosure.hpp @@ -110,6 +110,19 @@ namespace meshkernel /// @returns The generated points std::vector GeneratePoints(double scaleFactor = constants::missing::doubleValue) const; + /// @brief Get the projection used. + Projection GetProjection() const; + + /// @brief Compute the surface area of the enclosure. + /// + /// The area of the bounding polygon mimum the sum of the areas of the inner polygons + double ComputeSurfaceArea() const; + + /// @brief Compute the minimum and maximum segment lengths for the outer and all inner polygons + /// + /// Returns {minimum-segment-length, maximum-segment-length} + std::tuple SegmentLengthExtrema() const; + private: /// @typedef IndexRange /// @brief Contains the start and end of a section from the point array @@ -171,3 +184,8 @@ inline const meshkernel::Polygon& meshkernel::PolygonalEnclosure::Inner(const si { return m_inner[i]; } + +inline meshkernel::Projection meshkernel::PolygonalEnclosure::GetProjection() const +{ + return m_outer.GetProjection(); +} diff --git a/libs/MeshKernel/include/MeshKernel/TriangulationGenerator.hpp b/libs/MeshKernel/include/MeshKernel/TriangulationGenerator.hpp new file mode 100644 index 000000000..90aef45fa --- /dev/null +++ b/libs/MeshKernel/include/MeshKernel/TriangulationGenerator.hpp @@ -0,0 +1,91 @@ +//---- GPL --------------------------------------------------------------------- +// +// Copyright (C) Stichting Deltares, 2011-2026. +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation version 3. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see . +// +// contact: delft3d.support@deltares.nl +// Stichting Deltares +// P.O. Box 177 +// 2600 MH Delft, The Netherlands +// +// All indications and logos of, and references to, "Delft3D" and "Deltares" +// are registered trademarks of Stichting Deltares, and remain the property of +// Stichting Deltares. All rights reserved. +// +//------------------------------------------------------------------------------ + +#pragma once + +#include + +#include "MeshKernel/Mesh2D.hpp" +#include "MeshKernel/Polygons.hpp" + +namespace meshkernel +{ + + /// \brief Generate a triangulation from a polygonal domain boundary. + class TriangulationGenerator + { + public: + /// \brief Destructor + virtual ~TriangulationGenerator() = default; + + /// \brief Compute triangulation + virtual std::unique_ptr generate(const Polygons& polygon) const = 0; + }; + + /// \brief Generate a triangulation using the triangle.c function + class SimpleTriangulationGenerator : public TriangulationGenerator + { + public: + /// \brief Constructor + SimpleTriangulationGenerator(const double factor) : scaleFactor_(factor) {} + + /// \brief Compute points within polygon using triangle + std::vector generatePoints(const Polygons& polygon) const; + + /// \brief Compute triangulation using triangle + std::unique_ptr generate(const Polygons& polygon) const override; + + private: + /// \brief The scale factor used when generating points in polygon + const double scaleFactor_; + }; + + /// \brief Generate a triangulation using the SEPRAN library + class SepranTriangulationGenerator : public TriangulationGenerator + { + public: + /// \brief Compute triangulation using SEPRAN library + std::unique_ptr generate(const Polygons& polygon) const override; + + private: + /// \brief Find the smallest delta in the boundary polygon + static double minimumEdgeDelta(const std::vector& polygonNodes); + + /// \brief Generate a vector of references to polygons from the set of polygonal enclosures + static std::vector> generatePolygonReferences(const Polygons& polygon); + + /// \brief Construct the set of edges, elements and number of nodes per element to construct mesh2d + /// + /// From the set of elements (triples of node ids in a flat array) construct arra of edges and elements + static std::tuple, std::vector>, std::vector> + gatherEdgesAndFaces(const std::vector& triangulationElementNodes, const int numberOfElements); + + /// \brief Construct arra of points from flat array of double (x,y values store in adjacent pairs) + static std::vector pointsFromFlatArray(const std::vector& coordinates, const int numberOfPoints); + }; + +} // namespace meshkernel diff --git a/libs/MeshKernel/src/PolygonalEnclosure.cpp b/libs/MeshKernel/src/PolygonalEnclosure.cpp index b9142e226..9850ec45e 100644 --- a/libs/MeshKernel/src/PolygonalEnclosure.cpp +++ b/libs/MeshKernel/src/PolygonalEnclosure.cpp @@ -318,3 +318,40 @@ std::vector meshkernel::PolygonalEnclosure::GeneratePoints(do return triangulationWrapper.SelectNodes(*this); } + +double meshkernel::PolygonalEnclosure::ComputeSurfaceArea() const +{ + double area = 0.0; + + auto [outerArea, centreOfMass, orientation] = Outer().FaceAreaAndCenterOfMass(); + area = outerArea; + + for (UInt i = 0; i < NumberOfInner(); ++i) + { + auto [innerArea, centreOfMass, orientation] = Inner(i).FaceAreaAndCenterOfMass(); + area -= innerArea; + } + + return area; +} + +std::tuple meshkernel::PolygonalEnclosure::SegmentLengthExtrema() const +{ + + double minimumDelta = 0.0; + double maximumDelta = 0.0; + + auto [outerMinimum, outerMaximum] = Outer().SegmentLengthExtrema(); + minimumDelta = outerMinimum; + maximumDelta = outerMaximum; + + for (UInt i = 0; i < NumberOfInner(); ++i) + { + auto [innerMinimum, innerMaximum] = Inner(i).SegmentLengthExtrema(); + + minimumDelta = std::min(minimumDelta, innerMinimum); + maximumDelta = std::max(maximumDelta, innerMaximum); + } + + return {minimumDelta, maximumDelta}; +} diff --git a/libs/MeshKernel/src/TriangulationGenerator.cpp b/libs/MeshKernel/src/TriangulationGenerator.cpp new file mode 100644 index 000000000..e4482f17e --- /dev/null +++ b/libs/MeshKernel/src/TriangulationGenerator.cpp @@ -0,0 +1,241 @@ +#include "MeshKernel/TriangulationGenerator.hpp" + +#include "Mshoce.hpp" + +#include +#include +#include +#include + +std::vector meshkernel::SimpleTriangulationGenerator::generatePoints(const Polygons& polygon) const +{ + + if (polygon.GetNumPolygons() != 1) + { + throw MeshKernelError("Cannot generate a triangulation for {} polygons", polygon.GetNumPolygons()); + } + + // generate samples in the first polygonal enclosure + auto const generatedPoints = polygon.Enclosure(0).GeneratePoints(scaleFactor_ < 0.0 ? meshkernel::constants::missing::doubleValue : scaleFactor_); + return generatedPoints; +} + +std::unique_ptr meshkernel::SimpleTriangulationGenerator::generate(const Polygons& polygon) const +{ + + if (polygon.GetNumPolygons() != 1) + { + throw MeshKernelError("Cannot generate a triangulation for {} polygons", polygon.GetNumPolygons()); + } + + // generate samples in the first polygonal enclosure + auto const generatedPoints = generatePoints(polygon); + + return std::make_unique(generatedPoints, polygon, polygon.GetProjection()); +} + +double meshkernel::SepranTriangulationGenerator::minimumEdgeDelta(const std::vector& polygonNodes) +{ + double delta = std::numeric_limits::max(); + + for (size_t i = 0; i + 1 < polygonNodes.size(); ++i) + { + double dx = polygonNodes[i + 1].x - polygonNodes[i].x; + double dy = polygonNodes[i + 1].y - polygonNodes[i].y; + + delta = std::min(delta, std::sqrt(dx * dx + dy * dy)); + } + + return delta; +} + +std::vector meshkernel::SepranTriangulationGenerator::pointsFromFlatArray(const std::vector& coordinates, const int numberOfPoints) +{ + std::vector meshNodes(numberOfPoints); + + for (int i = 0; i < numberOfPoints; ++i) + { + meshNodes[i].x = coordinates[2 * i]; + meshNodes[i].y = coordinates[2 * i + 1]; + } + + return meshNodes; +} + +std::vector> meshkernel::SepranTriangulationGenerator::generatePolygonReferences(const Polygons& polygon) +{ + const auto& enclosure = polygon.Enclosure(0); + + std::vector> boundaryLoops; + boundaryLoops.reserve(1 + enclosure.NumberOfInner()); + boundaryLoops.emplace_back(enclosure.Outer()); + + for (meshkernel::UInt i = 0; i < enclosure.NumberOfInner(); ++i) + { + boundaryLoops.emplace_back(enclosure.Inner(i)); + } + + return boundaryLoops; +} + +std::tuple, std::vector>, std::vector> +meshkernel::SepranTriangulationGenerator::gatherEdgesAndFaces(const std::vector& triangulationElementNodes, const int numberOfElements) +{ + + std::vector edges(3 * numberOfElements); + std::vector> faceNodes(numberOfElements); + std::vector numFaceNodes(numberOfElements, 0); + + // Gather all edges in the mesh + // The first stage will find shared edges twice, once for each triangle. The duplicate will be removed later. + for (int i = 0; i < numberOfElements; ++i) + { + int index = 3 * i; + + meshkernel::UInt n1 = static_cast(triangulationElementNodes[index] - 1); + meshkernel::UInt n2 = static_cast(triangulationElementNodes[index + 1] - 1); + meshkernel::UInt n3 = static_cast(triangulationElementNodes[index + 2] - 1); + + // Which is better, reserve and push back or allocate and assign? + edges[index] = n1 < n2 ? meshkernel::Edge(n1, n2) : meshkernel::Edge(n2, n1); + edges[index + 1] = n2 < n3 ? meshkernel::Edge(n2, n3) : meshkernel::Edge(n3, n2); + edges[index + 2] = n3 < n1 ? meshkernel::Edge(n3, n1) : meshkernel::Edge(n1, n3); + + // Set the nodes of the element. + faceNodes[i].resize(3); + faceNodes[i][0] = n1; + faceNodes[i][1] = n2; + faceNodes[i][2] = n3; + + // Indicate that there are 3 nodes for this element + numFaceNodes[i] = 3; + } + + // Remove the duplicated edges. + // std::pair has a predefined less-than (Edge is a std;:pair) + // Should use the parallel sort, but does not seem to compile under macos: std::sort(std::execution::par, edges.begin(), edges.end()); + std::sort(edges.begin(), edges.end()); + auto [first, last] = std::ranges::unique(edges); + edges.erase(first, last); + + return {edges, faceNodes, numFaceNodes}; +} + +std::unique_ptr meshkernel::SepranTriangulationGenerator::generate(const Polygons& polygon) const +{ + + if (polygon.GetNumPolygons() != 1) + { + throw MeshKernelError("Cannot generate a triangulation for {} polygons", polygon.GetNumPolygons()); + } + + std::vector> boundaryLoops(generatePolygonReferences(polygon)); + + const int numberOfBoundaryNodes = std::accumulate(boundaryLoops.begin(), boundaryLoops.end(), 0, [](int sum, const auto& poly) + { return sum + static_cast(poly.get().Size()); }); + + const int dimension = 2; + const int elementIdentifier = 3; // 3-node linear triangles + const int numberOfPolygons = static_cast(boundaryLoops.size()); + const int numberOfHoles = numberOfPolygons - 1; + + // 1. Interleave coordinates into bcord: [x1, y1, x2, y2...] + // Flatten the outer polygon followed by each inner polygon, without separators. + std::vector boundaryCoordinates(2 * numberOfBoundaryNodes); + + // 2. Map edgeNodeConnectivity: Fortran uses 1-based indexing + std::vector edgeNodeConnectivity(numberOfBoundaryNodes, 0); + + // 3. Map boundary segments: Fortran boundary(2, numberOfPolygons) + // One curve entry per closed loop, flattened in column-major order. + + std::vector boundaryConnectivity(2 * numberOfPolygons); + + // 4. Compute elementSizing array for local polyline point matching + const int numberElementSizing = 0; // numberOfBoundaryNodes; + std::vector elementSizing(1, 0.0); // 3 * numberOfBoundaryNodes); + + int pointOffset = 0; + + for (int loopIndex = 0; loopIndex < numberOfPolygons; ++loopIndex) + { + const auto& loop = boundaryLoops[loopIndex].get().Nodes(); + + boundaryConnectivity[2 * loopIndex] = loopIndex + 1; + boundaryConnectivity[2 * loopIndex + 1] = pointOffset + 1; + + for (int i = 0; i < static_cast(loop.size()); ++i) + { + boundaryCoordinates[2 * (pointOffset + i)] = loop[i].x; + boundaryCoordinates[2 * (pointOffset + i) + 1] = loop[i].y; + edgeNodeConnectivity[pointOffset + i] = pointOffset + i + 1; + } + + pointOffset += static_cast(loop.size()); + } + + // 5. Dynamic Memory Allocation for Output Buffers + // Get estimate of area covered by polygon, subtracting area covered by holes + const double estimatedArea = polygon.Enclosure(0).ComputeSurfaceArea(); + // Compute the minimum spacing between points of the polygon, both outer and all inner polygons + const auto [minimumDelta, maximumDeltaDummy] = polygon.Enclosure(0).SegmentLengthExtrema(); + + const int estimatedNumberOfElements = static_cast((estimatedArea / (0.433 * minimumDelta * minimumDelta)) * 3.5); + const int maximumNumberOfNodes = numberOfBoundaryNodes + 3 * estimatedNumberOfElements; + const int maximumNumberOfElements = 2 * maximumNumberOfNodes; + + std::vector triangulationNodes(dimension * maximumNumberOfNodes, 0.0); + std::vector triangulationElementNodes(elementIdentifier * maximumNumberOfElements, 0); + + // 6. Dummies and Placeholders + std::vector holeinfo(2 * (numberOfHoles + 2), 0); + int forcedControlPoints = 0; + int surfaceSequenceNumber = 1; + int auxiliaryAlignment = 0; + + std::vector numnodextcurvs(1, 0); + std::vector curvenumbers(1, 0); + std::vector rinput(1, 0.0); + std::vector userpoints(1, 0); + + // 7. Make the Call + int newMesh = 1; + int numberOfPoints = maximumNumberOfNodes; + int numberOfElements = maximumNumberOfElements; + + sepran::SepranContext ctx = sepran::SepranContext::defaults(); + + sepran::mshoce( + newMesh != 0, + std::span(triangulationNodes), + std::span(triangulationElementNodes), + elementIdentifier, + numberOfBoundaryNodes, + std::span(boundaryCoordinates), + std::span(edgeNodeConnectivity), + std::span(boundaryConnectivity), + numberOfPolygons, + numberOfPoints, + numberOfElements, + std::span(holeinfo), + numberOfHoles, + numberElementSizing, + std::span(elementSizing), + std::span(userpoints), + surfaceSequenceNumber, + auxiliaryAlignment, + std::span(numnodextcurvs), + std::span(curvenumbers), + std::span(rinput), + forcedControlPoints, + dimension, + ctx); + + // Recover array of Points + std::vector meshNodes(pointsFromFlatArray(triangulationNodes, numberOfPoints)); + + // Recover arrays of edges, face-node connectivity and number of nodes per face. + auto [edges, faceNodes, numFaceNodes] = gatherEdgesAndFaces(triangulationElementNodes, numberOfElements); + + return std::make_unique(edges, meshNodes, faceNodes, numFaceNodes, polygon.GetProjection()); +} diff --git a/libs/MeshKernel/tests/src/MeshTests.cpp b/libs/MeshKernel/tests/src/MeshTests.cpp index 29d5c3eba..bc394494a 100644 --- a/libs/MeshKernel/tests/src/MeshTests.cpp +++ b/libs/MeshKernel/tests/src/MeshTests.cpp @@ -25,7 +25,9 @@ // //------------------------------------------------------------------------------ +#include #include +#include #include #include @@ -35,9 +37,11 @@ #include #include #include +#include #include #include #include +#include TEST(Mesh, OneQuadTestConstructor) { @@ -167,6 +171,56 @@ TEST(Mesh, TriangulateSamples) meshkernel::Mesh2D mesh(generatedPoints[0], polygons, meshkernel::Projection::cartesian); } +TEST(Mesh, TriangulateGridWithHoleSepran) +{ + + std::vector nodes{{0.0, 0.0}, {2.5, 0.0}, {5.0, 0}, {7.5, 0.0}, {10.0, 0.0}, {10.0, 2.5}, {10.0, 5.0}, {10.0, 7.5}, {10.0, 10.0}, {7.5, 10.0}, {5.0, 10.0}, {2.5, 10.0}, {0.0, 10.0}, {0.0, 7.5}, {0.0, 5.0}, {0.0, 2.5}, {0.0, 0.0}, {-998.0, -998.0}, {2.0, 2.0}, {3.5, 2.0}, {5.0, 2.0}, {5.0, 3.5}, {5.0, 5.0}, {2.0, 5.0}, {2.0, 2.0}}; + + meshkernel::Polygons polygons(nodes, meshkernel::Projection::cartesian); + + meshkernel::SepranTriangulationGenerator generator; + auto mesh2 = generator.generate(polygons); + + std::vector expectedEdgeStart{0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 3, 3, 4, 5, 5, 6, 6, 6, 6, 6, 7, 7, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16, 17, 18, 18, 19, 19, 19, 20, 20, 20, 20, 21, 22, 22, 23, 23, 25, 25, 25, 26, 27}; + + std::vector expectedEdgeEnd{1, 15, 16, 2, 16, 17, 3, 17, 18, 4, 5, 18, 22, 24, 5, 6, 24, 7, 23, 24, 25, 28, 8, 28, 9, 28, 10, 27, 28, 11, 26, 27, 12, 13, 26, 13, 14, 21, 26, 15, 21, 16, 21, 17, 21, 18, 19, 22, 20, 22, 23, 21, 23, 25, 26, 26, 23, 24, 24, 25, 26, 27, 28, 27, 28}; + + std::vector expectedNodeX{0, 2.5, 5, 7.5, 10, 10, 10, 10, 10, 7.5, 5, 2.5, 0, 0, 0, 0, 2, 3.5, 5, 5, 5, 2, 6.6875, 6.875, 8.974717773, 6.709407692, 4.603616331, 6.211802214, 8.535641403}; + std::vector expectedNodeY{0, 0, 0, 0, 0, 2.5, 5, 7.5, 10, 10, 10, 10, 10, 7.5, 5, 2.5, 2, 2, 2, 3.5, 5, 5, 2.750000185, 4.250000185, 3.225816901, 6.554770469, 7.15290529, 8.808791614, 8.139873532}; + + ASSERT_EQ(mesh2->GetNumNodes(), 29); + ASSERT_EQ(mesh2->GetNumEdges(), 65); + ASSERT_EQ(mesh2->GetNumFaces(), 36); + + const double tolerance = 1.0e-8; + + for (meshkernel::UInt i = 0; i < mesh2->GetNumNodes(); ++i) + { + EXPECT_NEAR(expectedNodeX[i], mesh2->Node(i).x, tolerance); + EXPECT_NEAR(expectedNodeY[i], mesh2->Node(i).y, tolerance); + } + + for (meshkernel::UInt i = 0; i < mesh2->GetNumEdges(); ++i) + { + EXPECT_EQ(expectedEdgeStart[i], mesh2->GetEdge(i).first); + EXPECT_EQ(expectedEdgeEnd[i], mesh2->GetEdge(i).second); + } +} + +TEST(Mesh, TriangulateGridFromRealisticPolygon) +{ + + std::string fileName(TEST_FOLDER + "/data/northbank_001b.pol"); + + auto poly = ReadPolygons(fileName, meshkernel::Projection::cartesian); + + meshkernel::SepranTriangulationGenerator generator; + auto mesh2 = generator.generate(*poly); + ASSERT_EQ(mesh2->GetNumFaces(), 3080); + ASSERT_EQ(mesh2->GetNumEdges(), 4733); + ASSERT_EQ(mesh2->GetNumNodes(), 1654); +} + TEST(Mesh, TwoTrianglesDuplicatedEdges) { // 1 Setup diff --git a/libs/MeshKernelApi/src/MeshKernel.cpp b/libs/MeshKernelApi/src/MeshKernel.cpp index 7d3f9504d..8af9f984a 100644 --- a/libs/MeshKernelApi/src/MeshKernel.cpp +++ b/libs/MeshKernelApi/src/MeshKernel.cpp @@ -84,6 +84,7 @@ #include #include #include +#include #include #include #include @@ -1946,7 +1947,7 @@ namespace meshkernelapi return lastExitCode; } - MKERNEL_API int mkernel_mesh2d_make_triangular_mesh_from_polygon(int meshKernelId, const GeometryList& polygonPoints, const double scaleFactor) + MKERNEL_API int mkernel_mesh2d_make_triangular_mesh_from_polygon(int meshKernelId, const GeometryList& polygonPoints, const double scaleFactor [[maybe_unused]]) { lastExitCode = meshkernel::ExitCode::Success; try @@ -1960,11 +1961,13 @@ namespace meshkernelapi const meshkernel::Polygons polygon(polygonPointsVector, meshKernelState[meshKernelId].m_mesh2d->m_projection); - // generate samples in the first polygonal enclosure - auto const generatedPoints = polygon.Enclosure(0).GeneratePoints(scaleFactor < 0.0 ? meshkernel::constants::missing::doubleValue : scaleFactor); + // TODO perhaps a triangulation factory or a simple if method == this or method == that then allocate + // SepranTriangulationGenerator or SimpleTriangulationGenerator. This would require a breaking change in the API + // to provide the triangulation method. + meshkernel::SepranTriangulationGenerator generator; - const meshkernel::Mesh2D mesh(generatedPoints, polygon, meshKernelState[meshKernelId].m_mesh2d->m_projection); - meshKernelUndoStack.Add(meshKernelState[meshKernelId].m_mesh2d->Join(mesh), meshKernelId); + // const meshkernel::Mesh2D mesh(generatedPoints, polygon, meshKernetate[meshKernelId].m_mesh2d->m_projection); + meshKernelUndoStack.Add(meshKernelState[meshKernelId].m_mesh2d->Join(*generator.generate(polygon)), meshKernelId); } catch (...) { diff --git a/libs/MeshKernelApi/tests/CMakeLists.txt b/libs/MeshKernelApi/tests/CMakeLists.txt index ab1e61d99..f642be1ba 100644 --- a/libs/MeshKernelApi/tests/CMakeLists.txt +++ b/libs/MeshKernelApi/tests/CMakeLists.txt @@ -50,6 +50,7 @@ target_link_libraries( MeshKernelTestUtils gmock gtest_main + Sepran ) # Make sure that coverage information is produced when using gcc diff --git a/libs/MeshKernelApi/tests/src/ApiTest.cpp b/libs/MeshKernelApi/tests/src/ApiTest.cpp index dafc7f6b0..2b9deda56 100644 --- a/libs/MeshKernelApi/tests/src/ApiTest.cpp +++ b/libs/MeshKernelApi/tests/src/ApiTest.cpp @@ -340,8 +340,14 @@ TEST_F(CartesianApiTestFixture, GenerateTriangularGridThroughApi) ASSERT_EQ(meshkernel::ExitCode::Success, errorCode); // Assert + ASSERT_EQ(33, mesh2d.num_nodes); + ASSERT_EQ(80, mesh2d.num_edges); + +#if 0 + // Leave here until we decide what to do about the triangulation from polygon api ASSERT_EQ(23, mesh2d.num_nodes); ASSERT_EQ(50, mesh2d.num_edges); +#endif } TEST_F(CartesianApiTestFixture, GenerateTriangularGridFromSamplesThroughApi) @@ -1852,8 +1858,12 @@ TEST_F(CartesianApiTestFixture, GenerateTriangularGridThroughApi_OnClockWisePoly ASSERT_EQ(meshkernel::ExitCode::Success, errorCode); // Assert + ASSERT_EQ(4, mesh2d.num_nodes); + ASSERT_EQ(5, mesh2d.num_edges); +#if 0 ASSERT_EQ(5, mesh2d.num_nodes); ASSERT_EQ(8, mesh2d.num_edges); +#endif } TEST_F(CartesianApiTestFixture, TranslateMesh) diff --git a/tools/test_utils/src/PolygonReader.cpp b/tools/test_utils/src/PolygonReader.cpp index a1805fcc9..d7d641586 100644 --- a/tools/test_utils/src/PolygonReader.cpp +++ b/tools/test_utils/src/PolygonReader.cpp @@ -87,7 +87,10 @@ std::unique_ptr ReadPolygons(const std::string& fileName, points.push_back(readPoint(line)); } - points.push_back(points[currentSize]); + if (points[currentSize] != points.back()) + { + points.push_back(points[currentSize]); + } } } }