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add z_rotate option, which rotates grid around axis of rotation #2

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add z_rotate option, which rotates grid around axis of rotation #2

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19 changes: 19 additions & 0 deletions src/SQuadGen.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -445,6 +445,9 @@ int main(int argc, char** argv) {
// Grid rotation about the Y axis
double dGridYRotate;

// Grid rotation about the Z axis
double dGridZRotate;

// Number of tesselations
int nTessellations;

Expand Down Expand Up @@ -475,6 +478,7 @@ int main(int argc, char** argv) {
CommandLineDouble(dImageLatBase, "lat_base", 0.0);
CommandLineDouble(dGridXRotate, "x_rotate", 0.0);
CommandLineDouble(dGridYRotate, "y_rotate", 0.0);
CommandLineDouble(dGridZRotate, "z_rotate", 0.0);
CommandLineInt(nTessellations, "tessellate", 0);
CommandLineInt(nSubCellResolution, "subcellres", 0);
CommandLineBool(fInvertImage, "invert");
Expand Down Expand Up @@ -650,6 +654,21 @@ int main(int argc, char** argv) {
}
}

// Rotate around the Z axis
if (dGridZRotate != 0.0) {
printf("Rotating grid around Z axis.\n");
double dCosTheta = cos(dGridZRotate * M_PI / 180.0);
double dSinTheta = sin(dGridZRotate * M_PI / 180.0);

for (int i = 0; i < vecNodes.size(); i++) {
double dTempX = vecNodes[i].x;
double dTempY = vecNodes[i].y;

vecNodes[i].x = dCosTheta * dTempX - dSinTheta * dTempY;
vecNodes[i].y = dSinTheta * dTempX + dCosTheta * dTempY;
}
}

// Output number of nodes and faces
printf("----------------------------------------\n");
printf("Node Count: %lu\n", vecNodes.size());
Expand Down