` +Asymmetric subplot arrangements now support proper axis labeling, enabling complex multi-panel figures without manual positioning workarounds. + +**Multi-Span Colorbars** (\ `#394
` +Colorbars can span multiple subplots, eliminating redundant color scales in comparative visualizations. + +**RC-Configurable Color Cycles** (\ `#378
` +Cycle objects can be set via rc configuration, enabling consistent color schemes across figures and projects. + +**Improved Label Sharing** (\ `#372
` +Enhanced logic for axis label sharing in complex grid configurations with expanded test coverage. + +Infrastructure +~~~~~~~~~~~~~~ + + +* Automatic version checking (\ `#377
` +This is particularly useful for settings that require **derived logic or side-effects**\ , such as updating related Matplotlib parameters. + +.. code-block:: python + + register_handler(name: str, func: Callable[[Any], Dict[str, Any]]) -> None + ` + +**Example (enabled by default):** + +.. code-block:: python + + def _cycle_handler(value): + # Custom logic to create a cycler object from the value + return {'axes.prop_cycle': new_cycler} + + rc.register_handler('cycle', _cycle_handler) + +Each handler function receives the **new value** of the setting and must return a **dictionary** mapping valid Matplotlib rc keys to their corresponding values. These updates are applied automatically to the runtime configuration. + +---- + +🧩 Why It Matters +""""""""""""""""" + +This addition: + + +* Fixes an issue where ``cycle:`` entries in ``ultraplotrc`` were not properly applied. +* Decouples configuration logic from Matplotlib internals. +* Provides a clean mechanism for extending the configuration system with custom logic — without circular imports or hard-coded dependencies. + +---- + +🔧 Internal Improvements +"""""""""""""""""""""""" + + +* Refactored configuration update flow to support handler callbacks. +* Simplified ``rc`` management by delegating side-effectful updates to registered handlers. + +---- + +💡 Developer Note +""""""""""""""""" + +This API is designed to be extensible. Future handlers may include dynamic color normalization, font synchronization, or interactive theme updates — all powered through the same mechanism. + +v1.61.1: 🚀 Release: CFTime Support and Integration (2025-10-08) +--------------------------------------------------------------- + +.. role:: raw-html-m2r(raw) + :format: html + + +Highlights +"""""""""" + +**CFTime Axis Support:**\ :raw-html-m2r:`
` +We’ve added robust support for CFTime objects throughout ``ultraplot``. This enables accurate plotting and formatting of time axes using non-standard calendars (e.g., ``noleap``\ , ``gregorian``\ , ``standard``\ ), which are common in climate and geoscience datasets. + +**Automatic Formatter and Locator Selection:**\ :raw-html-m2r:`
` +``ultraplot`` now automatically detects CFTime axes and applies the appropriate formatters and locators, ensuring correct tick placement and labeling for all supported calendar types. + +**Seamless Integration with xarray:**\ :raw-html-m2r:`
` +These features are designed for direct use with ``xarray`` datasets and dataarrays. When plotting data with CFTime indexes, ``ultraplot`` will handle all time axis formatting and tick generation automatically—no manual configuration required. + +---- + +Intended Use +"""""""""""" + +This release is aimed at users working with climate, weather, and geoscience data, where time coordinates may use non-standard calendars. The new CFTime functionality ensures that plots generated from ``xarray`` and other scientific libraries display time axes correctly, regardless of calendar type. + +---- + +Example Usage +""""""""""""" + +.. code-block:: python + + import xarray as xr + import numpy as np + import cftime + import ultraplot as uplt + + # Create a sample xarray DataArray with CFTime index + times = [cftime.DatetimeNoLeap(2001, 1, i+1) for i in range(10)] + data = xr.DataArray(np.random.rand(10), coords=[times], dims=["time"]) + + fig, ax = uplt.subplots() + data.plot(ax=ax) + + # CFTime axes are automatically formatted and labeled + ax.set_title("CFTime-aware plotting with ultraplot") + uplt.show() + +---- + +Migration and Compatibility +""""""""""""""""""""""""""" + + +* No changes are required for existing code using standard datetime axes. +* For datasets with CFTime indexes (e.g., from ``xarray``\ ), simply plot as usual—\ ``ultraplot`` will handle the rest. + +---- + +**We welcome feedback and bug reports as you explore these new capabilities!** + +What's Changed +~~~~~~~~~~~~~~ + + +* Fix edgecolor not set on scatter plots with single-row DataFrame data (https://github.com/Ultraplot/UltraPlot/pull/325) +* Add suptitle_kw alignment support to UltraPlot (https://github.com/Ultraplot/UltraPlot/pull/327) +* Update Documentation for ``abc`` Parameter in Subplots and Format Command (https://github.com/Ultraplot/UltraPlot/pull/328) +* Fix subplots docs (https://github.com/Ultraplot/UltraPlot/pull/330) +* Add members to api (https://github.com/Ultraplot/UltraPlot/pull/332) +* rm show from tests (https://github.com/Ultraplot/UltraPlot/pull/335) +* Revert "Fix edge case where vcenter is not properly set for diverging norms" (https://github.com/Ultraplot/UltraPlot/pull/337) +* Bump the github-actions group with 2 updates by @dependabot[bot] in https://github.com/Ultraplot/UltraPlot/pull/339 +* Extra tests for geobackends (https://github.com/Ultraplot/UltraPlot/pull/334) +* Fix some links for docs (https://github.com/Ultraplot/UltraPlot/pull/341) +* Fix links docs (https://github.com/Ultraplot/UltraPlot/pull/342) +* Lazy loading colormaps (https://github.com/Ultraplot/UltraPlot/pull/343) +* Set warning level for mpl to error (https://github.com/Ultraplot/UltraPlot/pull/350) +* Sanitize pad and len formatters on Cartesian Axes (https://github.com/Ultraplot/UltraPlot/pull/346) +* Fix order of label transfer (https://github.com/Ultraplot/UltraPlot/pull/353) +* Bump the github-actions group with 2 updates by @dependabot[bot] in https://github.com/Ultraplot/UltraPlot/pull/354 +* Add cftime support for non-standard calendars (https://github.com/Ultraplot/UltraPlot/pull/344) + +New Contributors +~~~~~~~~~~~~~~~~ + + +* @Copilot made their first contribution in https://github.com/Ultraplot/UltraPlot/pull/325 + +**Full Changelog**\ : https://github.com/Ultraplot/UltraPlot/compare/v1.60.2...v1.61.0 + +Note: v1.61.0 is yanked from pypi as it contained a debug statement. This merely removes the debug. + +v1.60.2: Hotfix: double depth decorator that affected geoplots (2025-08-18) +--------------------------------------------------------------------------- + +What's Changed +~~~~~~~~~~~~~~ + + +* Handle non homogeneous arrays (https://github.com/Ultraplot/UltraPlot/pull/318) +* Update Cartopy references (https://github.com/Ultraplot/UltraPlot/pull/322) +* Fix inhomogeneous violin test (https://github.com/Ultraplot/UltraPlot/pull/323) +* Fix issue where double decorator does not parse function name (https://github.com/Ultraplot/UltraPlot/pull/320) + +New Contributors +~~~~~~~~~~~~~~~~ + + +* @rcomer made their first contribution in https://github.com/Ultraplot/UltraPlot/pull/322 + +**Full Changelog**\ : https://github.com/Ultraplot/UltraPlot/compare/v1.60.1...v1.60.2 + +v1.60.1: Hotfixes for colors and colormaps (2025-08-08) +------------------------------------------------------- + +Minor bug fixes + +What's Changed +~~~~~~~~~~~~~~ + + +* Fix edge case where vcenter is not properly set for diverging norms (https://github.com/Ultraplot/UltraPlot/pull/314) +* Fix color parsing when color is not string (https://github.com/Ultraplot/UltraPlot/pull/315) + +**Full Changelog**\ : https://github.com/Ultraplot/UltraPlot/compare/v1.60.0...v1.60.1 + +v1.60.0: It's better to share! (2025-08-05) +------------------------------------------- + +.. role:: raw-html-m2r(raw) + :format: html + + +UltraPlot extends its sharing capabilities by redefining how sharing works. As of this release, sharing will operate by looking at the subplotgrid and extending label sharing when plots are adjacent. Labels will be turned on for those subplots that + + +* Face and edge of the plot +* or face an empty plot space + +In the past, sharing top and right labels would erroneously be turned off and could only be managed by turning the sharing feature off. + +For example, consider a simple 2x2 layout. Turning on the top and right labels now looks like: +:raw-html-m2r:`
snippet
+ + + ```python + import ultraplot as uplt, numpy as np + + # Create mock data + n_points, n_features = 50, 4 + features = np.arange(n_features) + data = np.empty((n_points, n_features)) + feature_values = np.repeat( + features, + n_points, + ).reshape(data.shape) + + for feature in features: + data[:, feature] = np.random.normal(feature * 1.5, 0.6, n_points) + + cmap = uplt.Colormap(uplt.rc["cmap.diverging"]) + + # Create plot and style + fig, (left, right) = uplt.subplots(ncols=2, share=0) + left.beeswarm( + data, + orientation="vertical", + alpha=0.7, + cmap=cmap, + ) + left.format( + title="Traditional Beeswarm Plot", + xlabel="Category", + ylabel="Value", + xticks=features, + xticklabels=["Group A", "Group B", "Group C", "Group D"], + ) + right.beeswarm( + data, + feature_values=feature_values, + cmap=cmap, + colorbar="right", + ) + right.format( + title="Feature Value Beeswarm Plot", + xlabel="SHAP Value", + yticks=features, + yticklabels=["A", "B", "C", "D"], + ylabel="Feature", + ) + uplt.show(block=1) + ``` +UltraPlot v1.50
+ + + +.. raw:: html + ++ Version v1.50 is a major milestone for UltraPlot. As we become more familiar with the codebase, we’ve opened the door to new features—balancing innovation with continuous backend improvements and bug fixes. +
+ + + +.. raw:: html + ++ + + +:raw-html-m2r:`
🌍 GeoAxes Sharing
` + + +.. raw:: html + +|
+ + You can now share axes between subplots using GeoAxes, as long as they use the same rectilinear projection. This enables cleaner, more consistent layouts when working with geographical data. + + |
+
+ |
+
+ + + +:raw-html-m2r:`
🕸️ Network Graphs
` + + +.. raw:: html + +|
+ + UltraPlot now supports network visualizations out of the box. With smart defaults and simple customization options, creating beautiful network plots is easier than ever. + + |
+
+ |
+
+
+
+
+:raw-html-m2r:`Network plotting code
+ + ```python + import networkx as nx, ultraplot as uplt + n = 100 + g = nx.random_geometric_graph(n, radius=0.2) + c = uplt.colormaps.get_cmap("viko") + c = c(np.linspace(0, 1, n)) + node = dict( + node_size=np.random.rand(n) * 100, + node_color=c, + ) + fig, ax = uplt.subplots() + ax.graph(g, layout="kamada_kawai", node_kw=node) + fig.show() + ``` + +🍭 Lollipop Graphs
` + + +.. raw:: html + +|
+ + A sleek alternative to bar charts, lollipop graphs are now available directly through UltraPlot. + They shine when visualizing datasets with many bars, reducing visual clutter while retaining clarity. + + |
+
+ |
+
+
+
+
+What's Changed
+~~~~~~~~~~~~~~
+
+
+* separate logger for ultraplot and matplotlib (https://github.com/Ultraplot/ultraplot/pull/178)
+* Capture warning (https://github.com/Ultraplot/ultraplot/pull/180)
+* tmp turning of test (https://github.com/Ultraplot/ultraplot/pull/183)
+* Skip missing tests if added in PR (https://github.com/Ultraplot/ultraplot/pull/175)
+* Revert "Skip missing tests if added in PR" (https://github.com/Ultraplot/ultraplot/pull/184)
+* rm conftest from codecov (https://github.com/Ultraplot/ultraplot/pull/187)
+* skip tests properly (https://github.com/Ultraplot/ultraplot/pull/186)
+* Fix colorbar loc (https://github.com/Ultraplot/ultraplot/pull/182)
+* Fix bar alpha (https://github.com/Ultraplot/ultraplot/pull/192)
+* make import uplt to be consistent with rest of repo (https://github.com/Ultraplot/ultraplot/pull/195)
+* Ensure that shared labels are consistently updated. (https://github.com/Ultraplot/ultraplot/pull/177)
+* sensible defaults and unittest (https://github.com/Ultraplot/ultraplot/pull/189)
+* Deprecation fix mpl 3.10 and beyond (https://github.com/Ultraplot/ultraplot/pull/69)
+* Add network plotting to UltraPlot (https://github.com/Ultraplot/ultraplot/pull/169)
+* Hotfix test (https://github.com/Ultraplot/ultraplot/pull/196)
+* Discrete colors for quiver (https://github.com/Ultraplot/ultraplot/pull/198)
+* correct url for basemap objects (https://github.com/Ultraplot/ultraplot/pull/202)
+* override logx/y/log with updated docstring (https://github.com/Ultraplot/ultraplot/pull/203)
+* Add lollipop graph (https://github.com/Ultraplot/ultraplot/pull/194)
+* Fix network linking in docs and api refs (https://github.com/Ultraplot/ultraplot/pull/205)
+* Avoid getting edges and setting centers for some shaders (https://github.com/Ultraplot/ultraplot/pull/208)
+* Fix some references in inset docs (https://github.com/Ultraplot/ultraplot/pull/209)
+* rm dep warning (https://github.com/Ultraplot/ultraplot/pull/210)
+* [Feature add] Share Axes in GeoPlot + bug fixes (https://github.com/Ultraplot/ultraplot/pull/159)
+
+**Full Changelog**\ : https://github.com/Ultraplot/ultraplot/compare/v1.11...v1.5
+
+v1.11: Various bug fixes (2025-04-25)
+-------------------------------------
+
+What's Changed
+~~~~~~~~~~~~~~
+
+
+* Update intersphinx links (https://github.com/Ultraplot/ultraplot/pull/128)
+* Update geo doc (https://github.com/Ultraplot/ultraplot/pull/129)
+* Hotfix update geo doc (https://github.com/Ultraplot/ultraplot/pull/130)
+* New site, who dis? (https://github.com/Ultraplot/ultraplot/pull/132)
+* Add about page (https://github.com/Ultraplot/ultraplot/pull/133)
+* Make it mobile friendly (https://github.com/Ultraplot/ultraplot/pull/134)
+* Add gallery to github page (https://github.com/Ultraplot/ultraplot/pull/140)
+* Fix readme (https://github.com/Ultraplot/ultraplot/pull/142)
+* Fix readme fixed sizes (https://github.com/Ultraplot/ultraplot/pull/143)
+* added page for errors (https://github.com/Ultraplot/ultraplot/pull/141)
+* Bump dawidd6/action-download-artifact from 2 to 6 in /.github/workflows (https://github.com/Ultraplot/ultraplot/pull/144)
+* fix: checkout from correct fork (https://github.com/Ultraplot/ultraplot/pull/145)
+* Set seed prior to test to ensure fidelity (https://github.com/Ultraplot/ultraplot/pull/148)
+* Move warning inside pytest config (https://github.com/Ultraplot/ultraplot/pull/151)
+* Fix scaler parsing (https://github.com/Ultraplot/ultraplot/pull/153)
+* Update site logo (https://github.com/Ultraplot/ultraplot/pull/154)
+* Fix minor grid showing on cbar (https://github.com/Ultraplot/ultraplot/pull/150)
+* Add option to place abc indicator outside the axis bbox (https://github.com/Ultraplot/ultraplot/pull/139)
+* Add unitests for ultraplot.internals.fonts (https://github.com/Ultraplot/ultraplot/pull/156)
+* Minor refactor of unittests (https://github.com/Ultraplot/ultraplot/pull/157)
+* Make anchor_mode default (https://github.com/Ultraplot/ultraplot/pull/161)
+* Ipy rc kernel reset (https://github.com/Ultraplot/ultraplot/pull/164)
+* allow subfigure formatting (https://github.com/Ultraplot/ultraplot/pull/167)
+* make cbar labelloc possible for all direction (https://github.com/Ultraplot/ultraplot/pull/165)
+* Add pyarrow to rm pandas error (https://github.com/Ultraplot/ultraplot/pull/171)
+* Center figures in docs (https://github.com/Ultraplot/ultraplot/pull/170)
+* mv toc to left (https://github.com/Ultraplot/ultraplot/pull/172)
+* surpress warnings on action (https://github.com/Ultraplot/ultraplot/pull/174)
+
+**Full Changelog**\ : https://github.com/Ultraplot/ultraplot/compare/v1.10.0...v1.11
+
+v1.10.0: Ticks for Geoaxes (2025-03-20)
+---------------------------------------
+
+This release marks a newly added feature: ticks on GeoAxes
+
+.. image:: https://github.com/user-attachments/assets/92670ef4-5cb1-49fe-9b23-8d69a80e80cf
+ :target: https://github.com/user-attachments/assets/92670ef4-5cb1-49fe-9b23-8d69a80e80cf
+ :alt: image
+
+This allows for users to set ticks for the x and or y axis. These can be controlled by ``lonticklen``\ , ``latticklen`` or ``ticklen`` for controlling the ``x``\ , ``y`` or both axis at the same time. This works independently to the major and minor gridlines allow for optimal control over the look and feel of your plots.
+
+What's Changed
+~~~~~~~~~~~~~~
+
+
+* prod: add me to maintainers (https://github.com/Ultraplot/ultraplot/pull/117)
+* prod: only use readthedocs for PR tests (https://github.com/Ultraplot/ultraplot/pull/118)
+* feat: enable test coverage with codecov (https://github.com/Ultraplot/ultraplot/pull/121)
+* dynamically build what's new (https://github.com/Ultraplot/ultraplot/pull/122)
+* rm extra == line (https://github.com/Ultraplot/ultraplot/pull/123)
+* bugfix for Axes.legend when certain keywords are set to str (https://github.com/Ultraplot/ultraplot/pull/124)
+* reduce verbosity of extension (https://github.com/Ultraplot/ultraplot/pull/127)
+* allow ticks for geoaxes (https://github.com/Ultraplot/ultraplot/pull/126)
+
+New Contributors
+~~~~~~~~~~~~~~~~
+
+
+* @syrte made their first contribution in https://github.com/Ultraplot/ultraplot/pull/124
+
+**Full Changelog**\ : https://github.com/Ultraplot/ultraplot/compare/v1.0.9...v1.10.0
+
+v1.0.9: IPython 9.0.0 compatibility and numerous backend fixes. (2025-03-05)
+----------------------------------------------------------------------------
+
+What's Changed
+~~~~~~~~~~~~~~
+
+
+* filter out property if not set (https://github.com/Ultraplot/ultraplot/pull/99)
+* Add texgyre to docs (https://github.com/Ultraplot/ultraplot/pull/101)
+* Texgyre fix (https://github.com/Ultraplot/ultraplot/pull/102)
+* rm warnings when downloading data inside env (https://github.com/Ultraplot/ultraplot/pull/104)
+* prod: only build ultraplot when ultraplot src changes (https://github.com/Ultraplot/ultraplot/pull/106)
+* Gitignore baseline (https://github.com/Ultraplot/ultraplot/pull/109)
+* Fix colorbar ticks (https://github.com/Ultraplot/ultraplot/pull/108)
+* Attempt fix workflow docs build (https://github.com/Ultraplot/ultraplot/pull/114)
+* rm ref semver (https://github.com/Ultraplot/ultraplot/pull/112)
+* Only store failed tests mpl-pytest (https://github.com/Ultraplot/ultraplot/pull/113)
+* fix: matrix test for no changes is running when it should not be (https://github.com/Ultraplot/ultraplot/pull/115)
+
+**Full Changelog**\ : https://github.com/Ultraplot/ultraplot/compare/v1.0.8...v1.0.9
+
+v1.0.8-2: Hotfix cycling properties (2025-02-27)
+------------------------------------------------
+
+Hot fix for cycle not recognizing color argument
+
+What's Changed
+~~~~~~~~~~~~~~
+
+
+* filter out property if not set (https://github.com/Ultraplot/ultraplot/pull/99)
+
+**Full Changelog**\ : https://github.com/Ultraplot/ultraplot/compare/v1.0.8...v1.0.8-2
+
+v1.0.8: Minor bug fixes (2025-02-23)
+------------------------------------
+
+Fixes an issue where ticks were not properly set when giving levels and ticks in ``pcolormesh`` and related functions in the colorbar. See more of the changes below.
+
+What's Changed
+~~~~~~~~~~~~~~
+
+
+* fix: remove race condition for pushes of tags (https://github.com/Ultraplot/ultraplot/pull/78)
+* use seed for reproducibility (https://github.com/Ultraplot/ultraplot/pull/79)
+* Fix demo function not extracting colormaps (https://github.com/Ultraplot/ultraplot/pull/83)
+* allows cycle to be a tuple (https://github.com/Ultraplot/ultraplot/pull/87)
+* Fixes heatmap not showing labels. (https://github.com/Ultraplot/ultraplot/pull/91)
+* Doc link fix (https://github.com/Ultraplot/ultraplot/pull/92)
+* explicitly override minor locator if given (https://github.com/Ultraplot/ultraplot/pull/96)
+
+**Full Changelog**\ : https://github.com/Ultraplot/ultraplot/compare/v1.0.7...v1.0.8
+
+v1.0.7: Dev update. (2025-02-15)
+--------------------------------
+
+What's Changed
+~~~~~~~~~~~~~~
+
+
+* added path explicitly on publish (https://github.com/Ultraplot/ultraplot/pull/77)
+
+**Full Changelog**\ : https://github.com/Ultraplot/ultraplot/compare/v1.0.6...v1.0.7
+
+v1.0.6: Ensure norm fix (2025-02-15)
+------------------------------------
+
+What's Changed
+~~~~~~~~~~~~~~
+
+
+* add case where cycler is already a cycle (https://github.com/Ultraplot/ultraplot/pull/65)
+* fix: make sure PRs do not mess with releases (https://github.com/Ultraplot/ultraplot/pull/67)
+* fix: ensure pypi readme works ok (https://github.com/Ultraplot/ultraplot/pull/70)
+* feat: deduplicate pypi publish workflow (https://github.com/Ultraplot/ultraplot/pull/71)
+* [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in https://github.com/Ultraplot/ultraplot/pull/73
+* use norm explicitly (https://github.com/Ultraplot/ultraplot/pull/76)
+
+New Contributors
+~~~~~~~~~~~~~~~~
+
+
+* @pre-commit-ci made their first contribution in https://github.com/Ultraplot/ultraplot/pull/73
+
+**Full Changelog**\ : https://github.com/Ultraplot/ultraplot/compare/v1.0.5...v1.0.6
+
+v1.0.5 (2025-02-02)
+-------------------
+
+What's Changed
+~~~~~~~~~~~~~~
+
+
+* test: adjust test matrix to use one locale and add matrix dimension over MPL versions (https://github.com/Ultraplot/ultraplot/pull/51)
+* Dep build (https://github.com/Ultraplot/ultraplot/pull/57)
+* Second dep on build still being skipped (https://github.com/Ultraplot/ultraplot/pull/58)
+* another attempt to fix publish (https://github.com/Ultraplot/ultraplot/pull/59)
+* fix: remove custom classifier for MPL (https://github.com/Ultraplot/ultraplot/pull/62)
+* fix: correct chain of logic for publish workflow (https://github.com/Ultraplot/ultraplot/pull/63)
+* fix: get pypi publish working (https://github.com/Ultraplot/ultraplot/pull/64)
+
+**Full Changelog**\ : https://github.com/Ultraplot/ultraplot/compare/v1.0.4...v1.0.5
+
+v1.0.4: Fixing Margins (2025-01-31)
+-----------------------------------
+
+A major change for this release is that the margins were not properly being set with the latest mpl. This reverts the margins back to the behavior where they are tighter as is expected from UltraPlot!
+
+v1.0.3: Minor bug fixes (2025-01-27)
+------------------------------------
+
+We are still experiencing some growing pains with proplot -> ultraplot conversion, however it is looking good. Some bugs were fixed regarding compatibility with mpl3.10 and we are moving towards fidelity checks. Please update when you can to this latest release.
+
+This release is to ensure that the latest version is on pypi and conda.
+
+**Full Changelog**\ : https://github.com/Ultraplot/ultraplot/compare/v1.0.2...v1.0.3
+
+v1.0: Big Compatibility Release! Matplotlib >= 3.8. (2025-01-11)
+----------------------------------------------------------------
+
+* 78367da2 (HEAD -> main, tag: v1.0, uplt/main) Matplotlib 3.10 - Compatability
+* 4e15fde2 Merge pull request #16 from cvanelteren/linter-workflow
+* 54837966 (origin/linter-workflow, linter-workflow) make repo - black compatible
+* 7aa82a2c added linter workflow
+* 97f14082 point readme badge to correct workflow
+* fb762c5b (origin/main) Merge pull request #13 from - cvanelteren/triangulation-fix
+* afa14caf (origin/triangulation-fix) removed pandas reference
+* 2d66e46b added data dict to unittest test and made - preprocessing compatible
+* 465688e7 add decorator to other trifunctions
+* ad83bfb0 ensure backwards compatibility
+* 23f65bb9 added df to unittest
+* d239bfc3 added unittest for triangulaions
+* 5bb8ac14 use mpl triangulation parser
+* 5dc8b44b move logic to internals and update input parsing - functions for tri
+* f213d870 tripoint also added
+* 9eeda2db small typo
+* a1c8894b Merge branch 'main' into triangulation-fix
+* 83973941 allow triangulation object in tricountour(f)
+* 6b8223a8 Merge pull request #4 from cvanelteren/conda
+* fa1f2fcc (origin/conda) removed conda recipe
+* defb219e separate build and test
+* 4cf2c940 # This is a combination of 2 commits. # This is the - 1st commit message:
+* 9c75035c separate build and test
+* 0089fe04 license revert
+* adac1c9a Merge pull request #10 from Ultraplot/revert-6-main
+* e31afe64 (uplt/revert-6-main) Revert "license update"
+* 35204ef4 renamed yml to ensure consistency
+* b243afe7 Merge pull request #8 from cvanelteren/main
+* 0c4bc1f8 replaced pplt -> uplt
+* 656a7464 Merge pull request #5 from cvanelteren/logo_square
+* 89c59cf5 Merge pull request #7 from cvanelteren/main
+* 8d01cf33 typo in readme shield
+* 7e0ec000 Merge pull request #6 from cvanelteren/main
+* 70157b33 license update
+* e6d8eca9 (origin/logo_square, logo_square) capitalization to - UltraPlot in docs
+* e99be782 square logos
+* c2a96554 separated workflows
+* 5609372c conda and pypi publish workflow
+* d04ea9d9 small changes in workflow
+* 5432bdbe add workflow for conda-forge
+
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+++ b/result_images/test_tribin/ternary_lim-expected.pdf
@@ -0,0 +1 @@
+/Users/vanelter@qut.edu.au/Documents/UltraPlot/mpltern/tests/baseline_images/test_tribin/ternary_lim.pdf
\ No newline at end of file
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diff --git a/ultraplot/axes/plot.py b/ultraplot/axes/plot.py
index b24fd98c9..f661e3d5a 100644
--- a/ultraplot/axes/plot.py
+++ b/ultraplot/axes/plot.py
@@ -10,7 +10,7 @@
import sys
from collections.abc import Callable, Iterable
from numbers import Integral, Number
-from typing import Any, Iterable, Optional, Union
+from typing import Any, Iterable, Mapping, Optional, Sequence, Union
import matplotlib as mpl
import matplotlib.artist as martist
@@ -205,6 +205,83 @@
"""
docstring._snippet_manager["plot.curved_quiver"] = _curved_quiver_docstring
+
+_sankey_docstring = """
+Draw a Sankey diagram.
+
+Parameters
+----------
+flows : sequence of float or flow tuples
+ If a numeric sequence, use Matplotlib's Sankey implementation.
+ Otherwise, expect flow tuples or dicts describing (source, target, value).
+nodes : sequence or dict, optional
+ Node identifiers or dicts with ``id``/``label``/``color`` keys. If omitted,
+ nodes are inferred from flow sources/targets.
+labels : sequence of str, optional
+ Labels for each flow in Matplotlib's Sankey mode.
+orientations : sequence of int, optional
+ Flow orientations (-1: down, 0: right, 1: up) for Matplotlib's Sankey.
+pathlengths : float or sequence of float, optional
+ Path lengths for each flow in Matplotlib's Sankey.
+trunklength : float, optional
+ Length of the trunk between the input and output flows.
+patchlabel : str, optional
+ Label for the main patch in Matplotlib's Sankey mode.
+scale, unit, format, gap, radius, shoulder, offset, head_angle, margin, tolerance : optional
+ Passed to `matplotlib.sankey.Sankey`.
+prior : int, optional
+ Index of a prior diagram to connect to.
+connect : (int, int), optional
+ Flow indices for the prior and current diagram connection.
+rotation : float, optional
+ Rotation angle in degrees.
+node_kw, flow_kw, label_kw : dict-like, optional
+ Style dictionaries for the layered Sankey renderer.
+node_label_kw, flow_label_kw : dict-like, optional
+ Label style dictionaries for node and flow labels in layered mode.
+node_label_box : bool or dict-like, optional
+ If ``True``, draw a rounded box behind node labels. If dict-like, used as
+ the ``bbox`` argument for node label styling.
+style : {'budget', 'pastel', 'mono'}, optional
+ Built-in styling presets for layered mode.
+node_order : sequence, optional
+ Explicit node ordering for layered mode.
+layer_order : sequence, optional
+ Explicit layer ordering for layered mode.
+group_cycle : sequence, optional
+ Cycle for flow group colors (defaults to flow cycle).
+flow_other : float, optional
+ Aggregate flows below this threshold into a single ``other_label``.
+other_label : str, optional
+ Label for the aggregated flow target.
+value_format : str or callable, optional
+ Formatter for flow labels when not explicitly provided.
+node_label_outside : {'auto', True, False}, optional
+ Place node labels outside narrow nodes.
+node_label_offset : float, optional
+ Offset for outside node labels (axes-relative units).
+flow_sort : bool, optional
+ Whether to sort flows by target position to reduce crossings.
+flow_label_pos : float, optional
+ Horizontal placement for single flow labels (0 to 1 along the ribbon).
+ When flow labels overlap, positions are redistributed between 0.25 and 0.75.
+node_labels, flow_labels : bool, optional
+ Whether to draw node or flow labels in layered mode.
+align : {'center', 'top', 'bottom'}, optional
+ Vertical alignment for nodes within each layer in layered mode.
+layers : dict-like, optional
+ Manual layer assignments for nodes in layered mode.
+**kwargs
+ Patch properties passed to `matplotlib.sankey.Sankey.add` in Matplotlib mode.
+
+Returns
+-------
+matplotlib.sankey.Sankey or list or SankeyDiagram
+ The Sankey diagram instance, or a list for multi-diagram usage. For layered
+ mode, returns a `~ultraplot.axes.plot_types.sankey.SankeyDiagram`.
+"""
+
+docstring._snippet_manager["plot.sankey"] = _sankey_docstring
# Auto colorbar and legend docstring
_guide_docstring = """
colorbar : bool, int, or str, optional
@@ -1849,6 +1926,169 @@ def curved_quiver(
stream_container = CurvedQuiverSet(lc, ac)
return stream_container
+ @docstring._snippet_manager
+ def sankey(
+ self,
+ flows: Any,
+ labels: Sequence[str] | None = None,
+ orientations: Sequence[int] | None = None,
+ pathlengths: float | Sequence[float] = 0.25,
+ trunklength: float = 1.0,
+ patchlabel: str = "",
+ *,
+ nodes: Any = None,
+ links: Any = None,
+ node_kw: Mapping[str, Any] | None = None,
+ flow_kw: Mapping[str, Any] | None = None,
+ label_kw: Mapping[str, Any] | None = None,
+ node_label_kw: Mapping[str, Any] | None = None,
+ flow_label_kw: Mapping[str, Any] | None = None,
+ node_label_box: bool | Mapping[str, Any] | None = None,
+ style: str | None = None,
+ node_order: Sequence[Any] | None = None,
+ layer_order: Sequence[int] | None = None,
+ group_cycle: Sequence[Any] | None = None,
+ flow_other: float | None = None,
+ other_label: str = "Other",
+ value_format: str | Callable[[float], str] | None = None,
+ node_label_outside: bool | str = "auto",
+ node_label_offset: float = 0.01,
+ flow_sort: bool = True,
+ flow_label_pos: float = 0.5,
+ node_labels: bool = True,
+ flow_labels: bool = False,
+ align: str = "center",
+ layers: Mapping[Any, int] | None = None,
+ scale: float | None = None,
+ unit: str | None = None,
+ format: str | None = None,
+ gap: float | None = None,
+ radius: float | None = None,
+ shoulder: float | None = None,
+ offset: float | None = None,
+ head_angle: float | None = None,
+ margin: float | None = None,
+ tolerance: float | None = None,
+ prior: int | None = None,
+ connect: tuple[int, int] | None = (0, 0),
+ rotation: float = 0,
+ **kwargs: Any,
+ ) -> Any:
+ """
+ %(plot.sankey)s
+ """
+
+ def _looks_like_links(values):
+ if values is None:
+ return False
+ if isinstance(values, np.ndarray) and values.ndim == 1:
+ return False
+ if isinstance(values, dict):
+ return True
+ if isinstance(values, (list, tuple)) and values:
+ first = values[0]
+ if isinstance(first, dict):
+ return True
+ if isinstance(first, (list, tuple)) and len(first) >= 3:
+ return True
+ return False
+
+ use_layered = nodes is not None or links is not None or _looks_like_links(flows)
+ if use_layered:
+ from .plot_types.sankey import sankey_diagram
+
+ node_kw = node_kw or {}
+ flow_kw = flow_kw or {}
+ label_kw = label_kw or {}
+ if links is None:
+ links = flows
+
+ cycle = rc["axes.prop_cycle"].by_key().get("color", [])
+ if not cycle:
+ cycle = [self._get_lines.get_next_color()]
+
+ return sankey_diagram(
+ self,
+ nodes=nodes,
+ flows=links,
+ layers=layers,
+ flow_cycle=cycle,
+ group_cycle=group_cycle,
+ node_order=node_order,
+ layer_order=layer_order,
+ style=style,
+ flow_other=flow_other,
+ other_label=other_label,
+ value_format=value_format,
+ node_kw=node_kw,
+ flow_kw=flow_kw,
+ label_kw=label_kw,
+ node_label_kw=node_label_kw,
+ flow_label_kw=flow_label_kw,
+ node_label_box=node_label_box,
+ node_label_outside=node_label_outside,
+ node_label_offset=node_label_offset,
+ flow_sort=flow_sort,
+ flow_label_pos=flow_label_pos,
+ node_labels=node_labels,
+ flow_labels=flow_labels,
+ align=align,
+ node_pad=rc["sankey.nodepad"],
+ node_width=rc["sankey.nodewidth"],
+ margin=rc["sankey.margin"],
+ flow_alpha=rc["sankey.flow.alpha"],
+ flow_curvature=rc["sankey.flow.curvature"],
+ node_facecolor=rc["sankey.node.facecolor"],
+ )
+
+ from matplotlib.sankey import Sankey
+
+ sankey_kw = {}
+ if scale is not None:
+ sankey_kw["scale"] = scale
+ if unit is not None:
+ sankey_kw["unit"] = unit
+ if format is not None:
+ sankey_kw["format"] = format
+ if gap is not None:
+ sankey_kw["gap"] = gap
+ if radius is not None:
+ sankey_kw["radius"] = radius
+ if shoulder is not None:
+ sankey_kw["shoulder"] = shoulder
+ if offset is not None:
+ sankey_kw["offset"] = offset
+ if head_angle is not None:
+ sankey_kw["head_angle"] = head_angle
+ if margin is not None:
+ sankey_kw["margin"] = margin
+ if tolerance is not None:
+ sankey_kw["tolerance"] = tolerance
+
+ if "facecolor" not in kwargs and "color" not in kwargs:
+ kwargs["facecolor"] = self._get_lines.get_next_color()
+
+ sankey = Sankey(ax=self, **sankey_kw)
+ add_kw = {
+ "flows": flows,
+ "trunklength": trunklength,
+ "patchlabel": patchlabel,
+ "rotation": rotation,
+ "pathlengths": pathlengths,
+ }
+ if labels is not None:
+ add_kw["labels"] = labels
+ if orientations is not None:
+ add_kw["orientations"] = orientations
+ if prior is not None:
+ add_kw["prior"] = prior
+ if connect is not None:
+ add_kw["connect"] = connect
+
+ sankey.add(**add_kw, **kwargs)
+ diagrams = sankey.finish()
+ return diagrams[0] if len(diagrams) == 1 else diagrams
+
def _call_native(self, name, *args, **kwargs):
"""
Call the plotting method and redirect internal calls to native methods.
diff --git a/ultraplot/axes/plot.py.rej b/ultraplot/axes/plot.py.rej
new file mode 100644
index 000000000..67b7a6e87
--- /dev/null
+++ b/ultraplot/axes/plot.py.rej
@@ -0,0 +1,264 @@
+diff a/ultraplot/axes/plot.py b/ultraplot/axes/plot.py (rejected hunks)
+@@ -10,7 +10,7 @@ import re
+ import sys
+ from collections.abc import Callable, Iterable
+ from numbers import Integral, Number
+-from typing import Any, Iterable, Optional, Union
++from typing import Any, Iterable, Mapping, Optional, Sequence, Union
+
+ import matplotlib as mpl
+ import matplotlib.artist as martist
+@@ -205,6 +205,83 @@ CurvedQuiverSet
+ """
+
+ docstring._snippet_manager["plot.curved_quiver"] = _curved_quiver_docstring
++
++_sankey_docstring = """
++Draw a Sankey diagram.
++
++Parameters
++----------
++flows : sequence of float or flow tuples
++ If a numeric sequence, use Matplotlib's Sankey implementation.
++ Otherwise, expect flow tuples or dicts describing (source, target, value).
++nodes : sequence or dict, optional
++ Node identifiers or dicts with ``id``/``label``/``color`` keys. If omitted,
++ nodes are inferred from flow sources/targets.
++labels : sequence of str, optional
++ Labels for each flow in Matplotlib's Sankey mode.
++orientations : sequence of int, optional
++ Flow orientations (-1: down, 0: right, 1: up) for Matplotlib's Sankey.
++pathlengths : float or sequence of float, optional
++ Path lengths for each flow in Matplotlib's Sankey.
++trunklength : float, optional
++ Length of the trunk between the input and output flows.
++patchlabel : str, optional
++ Label for the main patch in Matplotlib's Sankey mode.
++scale, unit, format, gap, radius, shoulder, offset, head_angle, margin, tolerance : optional
++ Passed to `matplotlib.sankey.Sankey`.
++prior : int, optional
++ Index of a prior diagram to connect to.
++connect : (int, int), optional
++ Flow indices for the prior and current diagram connection.
++rotation : float, optional
++ Rotation angle in degrees.
++node_kw, flow_kw, label_kw : dict-like, optional
++ Style dictionaries for the layered Sankey renderer.
++node_label_kw, flow_label_kw : dict-like, optional
++ Label style dictionaries for node and flow labels in layered mode.
++node_label_box : bool or dict-like, optional
++ If ``True``, draw a rounded box behind node labels. If dict-like, used as
++ the ``bbox`` argument for node label styling.
++style : {'budget', 'pastel', 'mono'}, optional
++ Built-in styling presets for layered mode.
++node_order : sequence, optional
++ Explicit node ordering for layered mode.
++layer_order : sequence, optional
++ Explicit layer ordering for layered mode.
++group_cycle : sequence, optional
++ Cycle for flow group colors (defaults to flow cycle).
++flow_other : float, optional
++ Aggregate flows below this threshold into a single ``other_label``.
++other_label : str, optional
++ Label for the aggregated flow target.
++value_format : str or callable, optional
++ Formatter for flow labels when not explicitly provided.
++node_label_outside : {'auto', True, False}, optional
++ Place node labels outside narrow nodes.
++node_label_offset : float, optional
++ Offset for outside node labels (axes-relative units).
++flow_sort : bool, optional
++ Whether to sort flows by target position to reduce crossings.
++flow_label_pos : float, optional
++ Horizontal placement for single flow labels (0 to 1 along the ribbon).
++ When flow labels overlap, positions are redistributed between 0.25 and 0.75.
++node_labels, flow_labels : bool, optional
++ Whether to draw node or flow labels in layered mode.
++align : {'center', 'top', 'bottom'}, optional
++ Vertical alignment for nodes within each layer in layered mode.
++layers : dict-like, optional
++ Manual layer assignments for nodes in layered mode.
++**kwargs
++ Patch properties passed to `matplotlib.sankey.Sankey.add` in Matplotlib mode.
++
++Returns
++-------
++matplotlib.sankey.Sankey or list or SankeyDiagram
++ The Sankey diagram instance, or a list for multi-diagram usage. For layered
++ mode, returns a `~ultraplot.axes.plot_types.sankey.SankeyDiagram`.
++"""
++
++docstring._snippet_manager["plot.sankey"] = _sankey_docstring
+ # Auto colorbar and legend docstring
+ _guide_docstring = """
+ colorbar : bool, int, or str, optional
+@@ -1849,6 +1926,169 @@ class PlotAxes(base.Axes):
+ stream_container = CurvedQuiverSet(lc, ac)
+ return stream_container
+
++ @docstring._snippet_manager
++ def sankey(
++ self,
++ flows: Any,
++ labels: Sequence[str] | None = None,
++ orientations: Sequence[int] | None = None,
++ pathlengths: float | Sequence[float] = 0.25,
++ trunklength: float = 1.0,
++ patchlabel: str = "",
++ *,
++ nodes: Any = None,
++ links: Any = None,
++ node_kw: Mapping[str, Any] | None = None,
++ flow_kw: Mapping[str, Any] | None = None,
++ label_kw: Mapping[str, Any] | None = None,
++ node_label_kw: Mapping[str, Any] | None = None,
++ flow_label_kw: Mapping[str, Any] | None = None,
++ node_label_box: bool | Mapping[str, Any] | None = None,
++ style: str | None = None,
++ node_order: Sequence[Any] | None = None,
++ layer_order: Sequence[int] | None = None,
++ group_cycle: Sequence[Any] | None = None,
++ flow_other: float | None = None,
++ other_label: str = "Other",
++ value_format: str | Callable[[float], str] | None = None,
++ node_label_outside: bool | str = "auto",
++ node_label_offset: float = 0.01,
++ flow_sort: bool = True,
++ flow_label_pos: float = 0.5,
++ node_labels: bool = True,
++ flow_labels: bool = False,
++ align: str = "center",
++ layers: Mapping[Any, int] | None = None,
++ scale: float | None = None,
++ unit: str | None = None,
++ format: str | None = None,
++ gap: float | None = None,
++ radius: float | None = None,
++ shoulder: float | None = None,
++ offset: float | None = None,
++ head_angle: float | None = None,
++ margin: float | None = None,
++ tolerance: float | None = None,
++ prior: int | None = None,
++ connect: tuple[int, int] | None = (0, 0),
++ rotation: float = 0,
++ **kwargs: Any,
++ ) -> Any:
++ """
++ %(plot.sankey)s
++ """
++
++ def _looks_like_links(values):
++ if values is None:
++ return False
++ if isinstance(values, np.ndarray) and values.ndim == 1:
++ return False
++ if isinstance(values, dict):
++ return True
++ if isinstance(values, (list, tuple)) and values:
++ first = values[0]
++ if isinstance(first, dict):
++ return True
++ if isinstance(first, (list, tuple)) and len(first) >= 3:
++ return True
++ return False
++
++ use_layered = nodes is not None or links is not None or _looks_like_links(flows)
++ if use_layered:
++ from .plot_types.sankey import sankey_diagram
++
++ node_kw = node_kw or {}
++ flow_kw = flow_kw or {}
++ label_kw = label_kw or {}
++ if links is None:
++ links = flows
++
++ cycle = rc["axes.prop_cycle"].by_key().get("color", [])
++ if not cycle:
++ cycle = [self._get_lines.get_next_color()]
++
++ return sankey_diagram(
++ self,
++ nodes=nodes,
++ flows=links,
++ layers=layers,
++ flow_cycle=cycle,
++ group_cycle=group_cycle,
++ node_order=node_order,
++ layer_order=layer_order,
++ style=style,
++ flow_other=flow_other,
++ other_label=other_label,
++ value_format=value_format,
++ node_kw=node_kw,
++ flow_kw=flow_kw,
++ label_kw=label_kw,
++ node_label_kw=node_label_kw,
++ flow_label_kw=flow_label_kw,
++ node_label_box=node_label_box,
++ node_label_outside=node_label_outside,
++ node_label_offset=node_label_offset,
++ flow_sort=flow_sort,
++ flow_label_pos=flow_label_pos,
++ node_labels=node_labels,
++ flow_labels=flow_labels,
++ align=align,
++ node_pad=rc["sankey.nodepad"],
++ node_width=rc["sankey.nodewidth"],
++ margin=rc["sankey.margin"],
++ flow_alpha=rc["sankey.flow.alpha"],
++ flow_curvature=rc["sankey.flow.curvature"],
++ node_facecolor=rc["sankey.node.facecolor"],
++ )
++
++ from matplotlib.sankey import Sankey
++
++ sankey_kw = {}
++ if scale is not None:
++ sankey_kw["scale"] = scale
++ if unit is not None:
++ sankey_kw["unit"] = unit
++ if format is not None:
++ sankey_kw["format"] = format
++ if gap is not None:
++ sankey_kw["gap"] = gap
++ if radius is not None:
++ sankey_kw["radius"] = radius
++ if shoulder is not None:
++ sankey_kw["shoulder"] = shoulder
++ if offset is not None:
++ sankey_kw["offset"] = offset
++ if head_angle is not None:
++ sankey_kw["head_angle"] = head_angle
++ if margin is not None:
++ sankey_kw["margin"] = margin
++ if tolerance is not None:
++ sankey_kw["tolerance"] = tolerance
++
++ if "facecolor" not in kwargs and "color" not in kwargs:
++ kwargs["facecolor"] = self._get_lines.get_next_color()
++
++ sankey = Sankey(ax=self, **sankey_kw)
++ add_kw = {
++ "flows": flows,
++ "trunklength": trunklength,
++ "patchlabel": patchlabel,
++ "rotation": rotation,
++ "pathlengths": pathlengths,
++ }
++ if labels is not None:
++ add_kw["labels"] = labels
++ if orientations is not None:
++ add_kw["orientations"] = orientations
++ if prior is not None:
++ add_kw["prior"] = prior
++ if connect is not None:
++ add_kw["connect"] = connect
++
++ sankey.add(**add_kw, **kwargs)
++ diagrams = sankey.finish()
++ return diagrams[0] if len(diagrams) == 1 else diagrams
++
+ def _call_native(self, name, *args, **kwargs):
+ """
+ Call the plotting method and redirect internal calls to native methods.
diff --git a/ultraplot/axes/plot_types/sankey.py b/ultraplot/axes/plot_types/sankey.py
new file mode 100644
index 000000000..c56efacfc
--- /dev/null
+++ b/ultraplot/axes/plot_types/sankey.py
@@ -0,0 +1,912 @@
+# Helper tools for layered sankey diagrams.
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Any, Callable, Mapping, Sequence
+
+from matplotlib import colors as mcolors
+from matplotlib import patches as mpatches
+from matplotlib import path as mpath
+
+
+@dataclass
+class SankeyDiagram:
+ nodes: dict[Any, mpatches.Patch]
+ flows: list[mpatches.PathPatch]
+ labels: dict[Any, Any]
+ layout: dict[str, Any]
+
+
+def _tint(color: Any, amount: float) -> tuple[float, float, float]:
+ """Return a lightened version of a base color."""
+ r, g, b = mcolors.to_rgb(color)
+ return (
+ (1 - amount) * r + amount,
+ (1 - amount) * g + amount,
+ (1 - amount) * b + amount,
+ )
+
+
+def _normalize_nodes(
+ nodes: Any, flows: Sequence[Mapping[str, Any]]
+) -> tuple[dict[Any, dict[str, Any]], list[Any]]:
+ """Normalize node definitions into a map and stable order list."""
+ # Infer node order from the first occurrence in flows.
+ if nodes is None:
+ order = []
+ seen = set()
+ for flow in flows:
+ for key in (flow["source"], flow["target"]):
+ if key not in seen:
+ seen.add(key)
+ order.append(key)
+ nodes = order
+
+ # Normalize nodes to a dict keyed by node id.
+ node_map = {}
+ order = []
+ if isinstance(nodes, dict):
+ nodes = [{"id": key, **value} for key, value in nodes.items()]
+ for node in nodes:
+ if isinstance(node, dict):
+ node_id = node.get("id", node.get("name"))
+ if node_id is None:
+ raise ValueError("Node dicts must include an 'id' or 'name'.")
+ label = node.get("label", str(node_id))
+ color = node.get("color", None)
+ else:
+ node_id = node
+ label = str(node_id)
+ color = None
+ node_map[node_id] = {"id": node_id, "label": label, "color": color}
+ order.append(node_id)
+ return node_map, order
+
+
+def _normalize_flows(flows: Any) -> list[dict[str, Any]]:
+ """Normalize flow definitions into a list of dicts."""
+ if flows is None:
+ raise ValueError("Flows are required to draw a sankey diagram.")
+ normalized = []
+ for flow in flows:
+ # Support dict flows or tuple-like flows.
+ if isinstance(flow, dict):
+ source = flow["source"]
+ target = flow["target"]
+ value = flow["value"]
+ label = flow.get("label", None)
+ color = flow.get("color", None)
+ else:
+ if len(flow) < 3:
+ raise ValueError(
+ "Flow tuples must have at least (source, target, value)."
+ )
+ source, target, value = flow[:3]
+ label = flow[3] if len(flow) > 3 else None
+ color = flow[4] if len(flow) > 4 else None
+ if value is None or value < 0:
+ raise ValueError("Flow values must be non-negative.")
+ if value == 0:
+ continue
+ # Store a consistent flow record for downstream layout/drawing.
+ normalized.append(
+ {
+ "source": source,
+ "target": target,
+ "value": float(value),
+ "label": label,
+ "color": color,
+ "group": flow.get("group", None) if isinstance(flow, dict) else None,
+ }
+ )
+ if not normalized:
+ raise ValueError("Flows must include at least one non-zero value.")
+ return normalized
+
+
+def _assign_layers(
+ flows: Sequence[Mapping[str, Any]],
+ nodes: Sequence[Any],
+ layers: Mapping[Any, int] | None,
+) -> dict[Any, int]:
+ """Assign layer indices for nodes using a DAG topological pass."""
+ if layers is not None:
+ # Honor explicit layer assignments when provided.
+ layer_map = dict(layers)
+ missing = [node for node in nodes if node not in layer_map]
+ if missing:
+ raise ValueError(f"Missing layer assignments for nodes: {missing}")
+ return layer_map
+
+ # Build adjacency for a simple topological layer assignment.
+ successors = {node: set() for node in nodes}
+ predecessors = {node: set() for node in nodes}
+ for flow in flows:
+ source = flow["source"]
+ target = flow["target"]
+ successors[source].add(target)
+ predecessors[target].add(source)
+
+ layer_map = {node: 0 for node in nodes}
+ indegree = {node: len(preds) for node, preds in predecessors.items()}
+ queue = [node for node, deg in indegree.items() if deg == 0]
+ visited = 0
+ # Kahn's algorithm to assign layers from sources outward.
+ while queue:
+ node = queue.pop(0)
+ visited += 1
+ for succ in successors[node]:
+ layer_map[succ] = max(layer_map[succ], layer_map[node] + 1)
+ indegree[succ] -= 1
+ if indegree[succ] == 0:
+ queue.append(succ)
+ if visited != len(nodes):
+ raise ValueError("Sankey nodes must form a directed acyclic graph.")
+ return layer_map
+
+
+def _compute_layout(
+ nodes: Sequence[Any],
+ flows: Sequence[Mapping[str, Any]],
+ *,
+ node_pad: float,
+ node_width: float,
+ align: str,
+ layers: Mapping[Any, int] | None,
+ margin: float,
+ layer_order: Sequence[int] | None = None,
+) -> tuple[
+ dict[str, Any],
+ dict[Any, list[dict[str, Any]]],
+ dict[Any, list[dict[str, Any]]],
+ dict[Any, float],
+]:
+ """Compute node and flow layout geometry in axes-relative coordinates."""
+ # Split flows into incoming/outgoing for node sizing.
+ flow_in = {node: [] for node in nodes}
+ flow_out = {node: [] for node in nodes}
+ for flow in flows:
+ flow_out[flow["source"]].append(flow)
+ flow_in[flow["target"]].append(flow)
+
+ node_value = {}
+ for node in nodes:
+ incoming = sum(flow["value"] for flow in flow_in[node])
+ outgoing = sum(flow["value"] for flow in flow_out[node])
+ # Nodes size to the larger of in/out totals.
+ node_value[node] = max(incoming, outgoing)
+
+ layer_map = _assign_layers(flows, nodes, layers)
+ max_layer = max(layer_map.values()) if layer_map else 0
+ if layer_order is None:
+ layer_order = sorted(set(layer_map.values()))
+ # Group nodes by layer in the desired order.
+ grouped = {layer: [] for layer in layer_order}
+ for node in nodes:
+ grouped[layer_map[node]].append(node)
+
+ height_available = 1.0 - 2 * margin
+ layer_totals = []
+ for layer, layer_nodes in grouped.items():
+ total = sum(node_value[node] for node in layer_nodes)
+ total += node_pad * max(len(layer_nodes) - 1, 0)
+ layer_totals.append(total)
+ scale = height_available / max(layer_totals) if layer_totals else 1.0
+
+ # Lay out nodes within each layer using the same scale.
+ layout = {"nodes": {}, "scale": scale, "layers": layer_map}
+ for layer in layer_order:
+ layer_nodes = grouped[layer]
+ total = sum(node_value[node] for node in layer_nodes) * scale
+ total += node_pad * max(len(layer_nodes) - 1, 0)
+ if align == "top":
+ start = margin + (height_available - total)
+ elif align == "bottom":
+ start = margin
+ else:
+ start = margin + (height_available - total) / 2
+ y = start
+ for node in layer_nodes:
+ height = node_value[node] * scale
+ layout["nodes"][node] = {
+ "x": margin
+ + (1.0 - 2 * margin - node_width) * (layer / max(max_layer, 1)),
+ "y": y,
+ "width": node_width,
+ "height": height,
+ }
+ y += height + node_pad
+ return layout, flow_in, flow_out, node_value
+
+
+def _ribbon_path(
+ x0: float,
+ y0: float,
+ x1: float,
+ y1: float,
+ thickness: float,
+ curvature: float,
+) -> mpath.Path:
+ """Build a closed Bezier path for a ribbon segment."""
+ dx = x1 - x0
+ if dx <= 0:
+ dx = max(thickness, 0.02)
+ cx0 = x0 + dx * curvature
+ cx1 = x1 - dx * curvature
+ top0 = y0 + thickness / 2
+ bot0 = y0 - thickness / 2
+ top1 = y1 + thickness / 2
+ bot1 = y1 - thickness / 2
+ verts = [
+ (x0, top0),
+ (cx0, top0),
+ (cx1, top1),
+ (x1, top1),
+ (x1, bot1),
+ (cx1, bot1),
+ (cx0, bot0),
+ (x0, bot0),
+ (x0, top0),
+ ]
+ codes = [
+ mpath.Path.MOVETO,
+ mpath.Path.CURVE4,
+ mpath.Path.CURVE4,
+ mpath.Path.CURVE4,
+ mpath.Path.LINETO,
+ mpath.Path.CURVE4,
+ mpath.Path.CURVE4,
+ mpath.Path.CURVE4,
+ mpath.Path.CLOSEPOLY,
+ ]
+ return mpath.Path(verts, codes)
+
+
+def _bezier_point(p0: float, p1: float, p2: float, p3: float, t: float) -> float:
+ """Evaluate a cubic Bezier coordinate at t in [0, 1]."""
+ u = 1 - t
+ return (u**3) * p0 + 3 * (u**2) * t * p1 + 3 * u * (t**2) * p2 + (t**3) * p3
+
+
+def _flow_label_point(
+ x0: float,
+ y0: float,
+ x1: float,
+ y1: float,
+ thickness: float,
+ curvature: float,
+ frac: float,
+) -> tuple[float, float]:
+ """Return a point along the flow centerline for label placement."""
+ dx = x1 - x0
+ if dx <= 0:
+ dx = max(thickness, 0.02)
+ cx0 = x0 + dx * curvature
+ cx1 = x1 - dx * curvature
+ target_x = x0 + (x1 - x0) * frac
+ if x1 == x0:
+ t = frac
+ else:
+ lo, hi = 0.0, 1.0
+ for _ in range(24):
+ mid = (lo + hi) / 2
+ mid_x = _bezier_point(x0, cx0, cx1, x1, mid)
+ if mid_x < target_x:
+ lo = mid
+ else:
+ hi = mid
+ t = (lo + hi) / 2
+ x = _bezier_point(x0, cx0, cx1, x1, t)
+ y = _bezier_point(y0, y0, y1, y1, t)
+ return x, y
+
+
+def _apply_style(
+ style: str | None,
+ *,
+ flow_cycle: Sequence[Any] | None,
+ node_facecolor: Any,
+ flow_alpha: float,
+ flow_curvature: float,
+ node_label_box: bool | Mapping[str, Any] | None,
+ node_label_kw: Mapping[str, Any],
+) -> dict[str, Any]:
+ """Apply a named style preset and merge overrides."""
+ if style is None:
+ return {
+ "flow_cycle": flow_cycle,
+ "node_facecolor": node_facecolor,
+ "flow_alpha": flow_alpha,
+ "flow_curvature": flow_curvature,
+ "node_label_box": node_label_box,
+ "node_label_kw": node_label_kw,
+ }
+ presets = {
+ "budget": dict(
+ node_facecolor="0.8",
+ flow_alpha=0.85,
+ flow_curvature=0.55,
+ node_label_box=True,
+ node_label_kw=dict(fontsize=9, color="0.2"),
+ ),
+ "pastel": dict(
+ node_facecolor="0.88",
+ flow_alpha=0.7,
+ flow_curvature=0.6,
+ node_label_box=True,
+ ),
+ "mono": dict(
+ node_facecolor="0.7",
+ flow_alpha=0.5,
+ flow_curvature=0.45,
+ node_label_box=False,
+ flow_cycle=["0.55"],
+ ),
+ }
+ if style not in presets:
+ raise ValueError(f"Unknown sankey style {style!r}.")
+ preset = presets[style]
+ # Merge preset overrides with caller-provided defaults.
+ return {
+ "flow_cycle": preset.get("flow_cycle", flow_cycle),
+ "node_facecolor": preset.get("node_facecolor", node_facecolor),
+ "flow_alpha": preset.get("flow_alpha", flow_alpha),
+ "flow_curvature": preset.get("flow_curvature", flow_curvature),
+ "node_label_box": preset.get("node_label_box", node_label_box),
+ "node_label_kw": {**preset.get("node_label_kw", {}), **node_label_kw},
+ }
+
+
+def _apply_flow_other(
+ flows: list[dict[str, Any]], flow_other: float | None, other_label: str
+) -> list[dict[str, Any]]:
+ """Aggregate small flows into a single 'Other' target per source."""
+ if flow_other is None:
+ return flows
+ # Collapse small values per source into an "Other" flow.
+ other_sums = {}
+ filtered = []
+ for flow in flows:
+ if flow["value"] < flow_other:
+ other_sums[flow["source"]] = (
+ other_sums.get(flow["source"], 0.0) + flow["value"]
+ )
+ else:
+ filtered.append(flow)
+ flows = filtered
+ for source, other_sum in other_sums.items():
+ if other_sum <= 0:
+ continue
+ flows.append(
+ {
+ "source": source,
+ "target": other_label,
+ "value": other_sum,
+ "label": None,
+ "color": None,
+ "group": None,
+ }
+ )
+ return flows
+
+
+def _ensure_nodes(
+ nodes: Any,
+ flows: Sequence[Mapping[str, Any]],
+ node_order: Sequence[Any] | None,
+) -> tuple[dict[Any, dict[str, Any]], list[Any]]:
+ """Ensure all flow endpoints exist in nodes and validate ordering."""
+ node_map, node_order_default = _normalize_nodes(nodes, flows)
+ # Add any missing flow endpoints to the node list if ordering is implicit.
+ flow_nodes = {flow["source"] for flow in flows} | {flow["target"] for flow in flows}
+ missing_nodes = [node for node in flow_nodes if node not in node_map]
+ if missing_nodes and node_order is not None:
+ raise ValueError("node_order must include every node exactly once.")
+ if missing_nodes:
+ for node in missing_nodes:
+ node_map[node] = {"id": node, "label": str(node), "color": None}
+ node_order_default.append(node)
+ node_order = node_order or node_order_default
+ if set(node_order) != set(node_map.keys()):
+ raise ValueError("node_order must include every node exactly once.")
+ return node_map, node_order
+
+
+def _assign_flow_colors(
+ flows: Sequence[Mapping[str, Any]],
+ flow_cycle: Sequence[Any] | None,
+ group_cycle: Sequence[Any] | None,
+) -> dict[Any, Any]:
+ """Assign colors to flows by group or source."""
+ if flow_cycle is None:
+ flow_cycle = ["0.6"]
+ if group_cycle is None:
+ group_cycle = flow_cycle
+ group_iter = iter(group_cycle)
+ flow_color_map = {}
+ # Assign a stable color per group (or per source if no group).
+ for flow in flows:
+ if flow["color"] is not None:
+ continue
+ group = flow["group"] or flow["source"]
+ if group not in flow_color_map:
+ try:
+ flow_color_map[group] = next(group_iter)
+ except StopIteration:
+ group_iter = iter(group_cycle)
+ flow_color_map[group] = next(group_iter)
+ flow["color"] = flow_color_map[group]
+ return flow_color_map
+
+
+def _sort_flows(
+ flows: Sequence[Mapping[str, Any]],
+ node_order: Sequence[Any],
+ layout: Mapping[str, Any],
+) -> list[dict[str, Any]]:
+ """Sort flows by target position to reduce crossings."""
+ # Order outgoing links by target center to reduce line crossings.
+ node_centers = {
+ node: layout["nodes"][node]["y"] + layout["nodes"][node]["height"] / 2
+ for node in node_order
+ }
+ ordered = []
+ seen = set()
+ for source in node_order:
+ outgoing = [flow for flow in flows if flow["source"] == source]
+ outgoing = sorted(outgoing, key=lambda f: node_centers[f["target"]])
+ for flow in outgoing:
+ ordered.append(flow)
+ seen.add(id(flow))
+ for flow in flows:
+ if id(flow) not in seen:
+ ordered.append(flow)
+ return ordered
+
+
+def _flow_label_text(
+ flow: Mapping[str, Any], value_format: str | Callable[[float], str] | None
+) -> str:
+ """Resolve the text for a flow label."""
+ label_text = flow.get("label", None)
+ if label_text is not None:
+ return label_text
+ if value_format is None:
+ return f"{flow['value']:.3g}"
+ if callable(value_format):
+ return value_format(flow["value"])
+ return value_format.format(flow["value"])
+
+
+def _flow_label_frac(idx: int, count: int, base: float) -> float:
+ """Return alternating label positions around the midpoint."""
+ if count <= 1:
+ return base
+ step = 0.25 if count == 2 else 0.2
+ offset = (idx // 2 + 1) * step
+ frac = base - offset if idx % 2 == 0 else base + offset
+ return min(max(frac, 0.05), 0.95)
+
+
+def _prepare_inputs(
+ *,
+ nodes: Any,
+ flows: Any,
+ flow_other: float | None,
+ other_label: str,
+ node_order: Sequence[Any] | None,
+ style: str | None,
+ flow_cycle: Sequence[Any] | None,
+ node_facecolor: Any,
+ flow_alpha: float,
+ flow_curvature: float,
+ node_label_box: bool | Mapping[str, Any] | None,
+ node_label_kw: Mapping[str, Any],
+ group_cycle: Sequence[Any] | None,
+) -> tuple[
+ list[dict[str, Any]],
+ dict[Any, dict[str, Any]],
+ list[Any],
+ dict[str, Any],
+ dict[Any, Any],
+]:
+ """Normalize inputs, apply style, and assign colors."""
+ # Parse flows and optional "other" aggregation.
+ flows = _normalize_flows(flows)
+ flows = _apply_flow_other(flows, flow_other, other_label)
+ # Ensure nodes include all flow endpoints.
+ node_map, node_order = _ensure_nodes(nodes, flows, node_order)
+ # Apply style presets and merge overrides.
+ style_config = _apply_style(
+ style,
+ flow_cycle=flow_cycle,
+ node_facecolor=node_facecolor,
+ flow_alpha=flow_alpha,
+ flow_curvature=flow_curvature,
+ node_label_box=node_label_box,
+ node_label_kw=node_label_kw,
+ )
+ # Resolve flow colors after style is applied.
+ flow_color_map = _assign_flow_colors(flows, style_config["flow_cycle"], group_cycle)
+ return flows, node_map, node_order, style_config, flow_color_map
+
+
+def _validate_layer_order(
+ layer_order: Sequence[int] | None,
+ flows: Sequence[Mapping[str, Any]],
+ node_order: Sequence[Any],
+ layers: Mapping[Any, int] | None,
+) -> None:
+ """Validate that layer_order is consistent with computed layers."""
+ if layer_order is None:
+ return
+ # Compare explicit ordering with the computed layer set.
+ layer_map = _assign_layers(flows, node_order, layers)
+ if set(layer_order) != set(layer_map.values()):
+ raise ValueError("layer_order must include every layer.")
+
+
+def _layer_positions(
+ layout: Mapping[str, Any], layer_order: Sequence[int] | None
+) -> tuple[dict[Any, int], dict[int, int]]:
+ """Return layer maps and positions for label placement."""
+ # Map layer ids to positions for outside-label placement.
+ layer_map = layout["layers"]
+ if layer_order is not None:
+ layer_position = {layer: idx for idx, layer in enumerate(layer_order)}
+ else:
+ layer_position = {layer: layer for layer in set(layer_map.values())}
+ return layer_map, layer_position
+
+
+def _label_box(
+ node_label_box: bool | Mapping[str, Any] | None,
+) -> dict[str, Any] | None:
+ """Return a bbox dict for node labels, if requested."""
+ if not node_label_box:
+ return None
+ if node_label_box is True:
+ # Default rounded box styling.
+ return dict(
+ boxstyle="round,pad=0.2,rounding_size=0.1",
+ facecolor="white",
+ edgecolor="none",
+ alpha=0.9,
+ )
+ return dict(node_label_box)
+
+
+def _draw_flows(
+ ax,
+ *,
+ flows: Sequence[Mapping[str, Any]],
+ node_order: Sequence[Any],
+ layout: Mapping[str, Any],
+ flow_color_map: Mapping[Any, Any],
+ flow_kw: Mapping[str, Any],
+ label_kw: Mapping[str, Any],
+ flow_label_kw: Mapping[str, Any],
+ flow_labels: bool,
+ value_format: str | Callable[[float], str] | None,
+ flow_label_pos: float,
+ flow_alpha: float,
+ flow_curvature: float,
+) -> tuple[list[mpatches.PathPatch], dict[Any, Any]]:
+ """Draw flow ribbons and optional labels."""
+ flow_patches = []
+ labels_out = {}
+ label_items = []
+ # Track running offsets per node so flows stack without overlap.
+ out_offsets = {node: 0.0 for node in node_order}
+ in_offsets = {node: 0.0 for node in node_order}
+ link_counts = {}
+ link_seen = {}
+ if flow_labels:
+ # Count links so multiple labels on the same link can be spaced.
+ for flow in flows:
+ key = (flow["source"], flow["target"])
+ link_counts[key] = link_counts.get(key, 0) + 1
+ for flow in flows:
+ source = flow["source"]
+ target = flow["target"]
+ thickness = flow["value"] * layout["scale"]
+ src = layout["nodes"][source]
+ tgt = layout["nodes"][target]
+ x0 = src["x"] + src["width"]
+ x1 = tgt["x"]
+ y0 = src["y"] + out_offsets[source] + thickness / 2
+ y1 = tgt["y"] + in_offsets[target] + thickness / 2
+ out_offsets[source] += thickness
+ in_offsets[target] += thickness
+ # Resolve color and build the ribbon patch.
+ color = flow["color"] or flow_color_map.get(flow["group"] or source, "0.6")
+ facecolor = _tint(color, 0.35)
+ path = _ribbon_path(x0, y0, x1, y1, thickness, flow_curvature)
+ base_flow_kw = {"edgecolor": "none", "linewidth": 0.0}
+ base_flow_kw.update(flow_kw)
+ flow_facecolor = base_flow_kw.pop("facecolor", facecolor)
+ patch = mpatches.PathPatch(
+ path,
+ facecolor=flow_facecolor,
+ alpha=flow_alpha,
+ **base_flow_kw,
+ )
+ ax.add_patch(patch)
+ flow_patches.append(patch)
+
+ if flow_labels:
+ # Place label along the ribbon length.
+ label_text = _flow_label_text(flow, value_format)
+ if label_text:
+ key = (source, target)
+ count = link_counts.get(key, 1)
+ idx = link_seen.get(key, 0)
+ link_seen[key] = idx + 1
+ frac = _flow_label_frac(idx, count, flow_label_pos)
+ label_x, label_y = _flow_label_point(
+ x0, y0, x1, y1, thickness, flow_curvature, frac
+ )
+ text = ax.text(
+ label_x,
+ label_y,
+ str(label_text),
+ ha="center",
+ va="center",
+ **{**label_kw, **flow_label_kw},
+ )
+ labels_out[(source, target, idx)] = text
+ label_items.append(
+ {
+ "text": text,
+ "source": source,
+ "target": target,
+ "x0": x0,
+ "x1": x1,
+ "y0": y0,
+ "y1": y1,
+ "thickness": thickness,
+ "curvature": flow_curvature,
+ "frac": frac,
+ "adjusted": False,
+ }
+ )
+
+ if flow_labels and len(label_items) > 1:
+
+ def _set_label_position(item: dict[str, Any], frac: float) -> None:
+ label_x, label_y = _flow_label_point(
+ item["x0"],
+ item["y0"],
+ item["x1"],
+ item["y1"],
+ item["thickness"],
+ item["curvature"],
+ frac,
+ )
+ item["text"].set_position((label_x, label_y))
+ item["frac"] = frac
+
+ for i in range(len(label_items)):
+ for j in range(i + 1, len(label_items)):
+ a = label_items[i]
+ b = label_items[j]
+ if (a["y0"] - b["y0"]) * (a["y1"] - b["y1"]) < 0:
+ if not a["adjusted"] and not b["adjusted"]:
+ _set_label_position(a, 0.25)
+ _set_label_position(b, 0.75)
+ a["adjusted"] = True
+ b["adjusted"] = True
+ elif a["adjusted"] ^ b["adjusted"]:
+ primary = a if a["adjusted"] else b
+ secondary = b if a["adjusted"] else a
+ if abs(primary["frac"] - 0.25) < 1.0e-6:
+ target = 0.75
+ elif abs(primary["frac"] - 0.75) < 1.0e-6:
+ target = 0.25
+ else:
+ target = 0.25
+ _set_label_position(secondary, target)
+ secondary["adjusted"] = True
+ return flow_patches, labels_out
+
+
+def _draw_nodes(
+ ax,
+ *,
+ node_order: Sequence[Any],
+ node_map: Mapping[Any, Mapping[str, Any]],
+ layout: Mapping[str, Any],
+ layer_map: Mapping[Any, int],
+ layer_position: Mapping[int, int],
+ node_facecolor: Any,
+ node_kw: Mapping[str, Any],
+ label_kw: Mapping[str, Any],
+ node_label_kw: Mapping[str, Any],
+ node_label_box: bool | Mapping[str, Any] | None,
+ node_labels: bool,
+ node_label_outside: bool | str,
+ node_label_offset: float,
+) -> tuple[dict[Any, mpatches.Patch], dict[Any, Any]]:
+ """Draw node rectangles and optional labels."""
+ node_patches = {}
+ labels_out = {}
+ for node in node_order:
+ node_info = layout["nodes"][node]
+ facecolor = node_map[node]["color"] or node_facecolor
+ # Draw the node block.
+ base_node_kw = {"edgecolor": "none", "linewidth": 0.0}
+ base_node_kw.update(node_kw)
+ node_face = base_node_kw.pop("facecolor", facecolor)
+ patch = mpatches.FancyBboxPatch(
+ (node_info["x"], node_info["y"]),
+ node_info["width"],
+ node_info["height"],
+ boxstyle="round,pad=0.0,rounding_size=0.008",
+ facecolor=node_face,
+ **base_node_kw,
+ )
+ ax.add_patch(patch)
+ node_patches[node] = patch
+ if node_labels:
+ # Place labels inside or outside based on width and position.
+ box_kw = _label_box(node_label_box)
+ label_x = node_info["x"] + node_info["width"] / 2
+ label_y = node_info["y"] + node_info["height"] / 2
+ ha = "center"
+ if node_label_outside:
+ mode = node_label_outside
+ if mode == "auto":
+ mode = node_info["width"] < 0.04
+ if mode:
+ layer = layer_position[layer_map[node]]
+ if layer == 0:
+ label_x = node_info["x"] - node_label_offset
+ ha = "right"
+ elif layer == max(layer_position.values()):
+ label_x = (
+ node_info["x"] + node_info["width"] + node_label_offset
+ )
+ ha = "left"
+ labels_out[node] = ax.text(
+ label_x,
+ label_y,
+ node_map[node]["label"],
+ ha=ha,
+ va="center",
+ bbox=box_kw,
+ **{**label_kw, **node_label_kw},
+ )
+ return node_patches, labels_out
+
+
+def sankey_diagram(
+ ax,
+ *,
+ nodes=None,
+ flows=None,
+ layers=None,
+ flow_cycle=None,
+ group_cycle=None,
+ node_order=None,
+ layer_order=None,
+ style=None,
+ flow_other=None,
+ other_label="Other",
+ value_format=None,
+ node_pad=0.02,
+ node_width=0.03,
+ node_kw=None,
+ flow_kw=None,
+ label_kw=None,
+ node_label_kw=None,
+ flow_label_kw=None,
+ node_label_box=None,
+ node_labels=True,
+ flow_labels=False,
+ flow_sort=True,
+ flow_label_pos=0.5,
+ node_label_outside="auto",
+ node_label_offset=0.01,
+ align="center",
+ margin=0.05,
+ flow_alpha=0.75,
+ flow_curvature=0.5,
+ node_facecolor="0.75",
+) -> SankeyDiagram:
+ """Render a layered Sankey diagram with optional labels."""
+ node_kw = node_kw or {}
+ flow_kw = flow_kw or {}
+ label_kw = label_kw or {}
+ node_label_kw = node_label_kw or {}
+ flow_label_kw = flow_label_kw or {}
+
+ # Normalize inputs, apply presets, and assign colors.
+ flows, node_map, node_order, style_config, flow_color_map = _prepare_inputs(
+ nodes=nodes,
+ flow_cycle=flow_cycle,
+ flow_other=flow_other,
+ other_label=other_label,
+ node_order=node_order,
+ style=style,
+ node_label_box=node_label_box,
+ node_label_kw=node_label_kw,
+ node_facecolor=node_facecolor,
+ flow_alpha=flow_alpha,
+ flow_curvature=flow_curvature,
+ group_cycle=group_cycle,
+ flows=flows,
+ )
+ node_facecolor = style_config["node_facecolor"]
+ flow_alpha = style_config["flow_alpha"]
+ flow_curvature = style_config["flow_curvature"]
+ node_label_box = style_config["node_label_box"]
+ node_label_kw = style_config["node_label_kw"]
+
+ # Validate optional layer ordering before layout.
+ _validate_layer_order(layer_order, flows, node_order, layers)
+
+ layout, _, _, _ = _compute_layout(
+ node_order,
+ flows,
+ node_pad=node_pad,
+ node_width=node_width,
+ align=align,
+ layers=layers,
+ margin=margin,
+ layer_order=layer_order,
+ )
+
+ layout["groups"] = flow_color_map
+
+ # Cache layer indices for label placement.
+ layer_map, layer_position = _layer_positions(layout, layer_order)
+
+ if flow_sort:
+ # Reorder flows to reduce crossings.
+ flows = _sort_flows(flows, node_order, layout)
+
+ # Draw flows and nodes, then merge their label handles.
+ flow_patches, flow_labels_out = _draw_flows(
+ ax,
+ flows=flows,
+ node_order=node_order,
+ layout=layout,
+ flow_color_map=flow_color_map,
+ flow_kw=flow_kw,
+ label_kw=label_kw,
+ flow_label_kw=flow_label_kw,
+ flow_labels=flow_labels,
+ value_format=value_format,
+ flow_label_pos=flow_label_pos,
+ flow_alpha=flow_alpha,
+ flow_curvature=flow_curvature,
+ )
+ node_patches, node_labels_out = _draw_nodes(
+ ax,
+ node_order=node_order,
+ node_map=node_map,
+ layout=layout,
+ layer_map=layer_map,
+ layer_position=layer_position,
+ node_facecolor=node_facecolor,
+ node_kw=node_kw,
+ label_kw=label_kw,
+ node_label_kw=node_label_kw,
+ node_label_box=node_label_box,
+ node_labels=node_labels,
+ node_label_outside=node_label_outside,
+ node_label_offset=node_label_offset,
+ )
+ labels_out = {**flow_labels_out, **node_labels_out}
+
+ # Lock axes to the unit square.
+ ax.set_xlim(0, 1)
+ ax.set_ylim(0, 1)
+ ax.set_axis_off()
+
+ return SankeyDiagram(
+ nodes=node_patches,
+ flows=flow_patches,
+ labels=labels_out,
+ layout=layout,
+ )
diff --git a/ultraplot/internals/rcsetup.py b/ultraplot/internals/rcsetup.py
index dc8c68463..7177e32a9 100644
--- a/ultraplot/internals/rcsetup.py
+++ b/ultraplot/internals/rcsetup.py
@@ -932,6 +932,37 @@ def copy(self):
_validate_bool,
"Whether to draw arrows at the end of curved quiver lines by default.",
),
+ # Sankey settings
+ "sankey.nodepad": (
+ 0.02,
+ _validate_float,
+ "Vertical padding between nodes in layered sankey diagrams.",
+ ),
+ "sankey.nodewidth": (
+ 0.03,
+ _validate_float,
+ "Node width for layered sankey diagrams (axes-relative units).",
+ ),
+ "sankey.margin": (
+ 0.05,
+ _validate_float,
+ "Margin around layered sankey diagrams (axes-relative units).",
+ ),
+ "sankey.flow.alpha": (
+ 0.75,
+ _validate_float,
+ "Flow transparency for layered sankey diagrams.",
+ ),
+ "sankey.flow.curvature": (
+ 0.5,
+ _validate_float,
+ "Flow curvature for layered sankey diagrams.",
+ ),
+ "sankey.node.facecolor": (
+ "0.75",
+ _validate_color,
+ "Default node facecolor for layered sankey diagrams.",
+ ),
# Stylesheet
"style": (
None,
diff --git a/ultraplot/internals/rcsetup.py.rej b/ultraplot/internals/rcsetup.py.rej
new file mode 100644
index 000000000..5a70a7a1a
--- /dev/null
+++ b/ultraplot/internals/rcsetup.py.rej
@@ -0,0 +1,39 @@
+diff a/ultraplot/internals/rcsetup.py b/ultraplot/internals/rcsetup.py (rejected hunks)
+@@ -932,6 +932,37 @@ _rc_ultraplot_table = {
+ _validate_bool,
+ "Whether to draw arrows at the end of curved quiver lines by default.",
+ ),
++ # Sankey settings
++ "sankey.nodepad": (
++ 0.02,
++ _validate_float,
++ "Vertical padding between nodes in layered sankey diagrams.",
++ ),
++ "sankey.nodewidth": (
++ 0.03,
++ _validate_float,
++ "Node width for layered sankey diagrams (axes-relative units).",
++ ),
++ "sankey.margin": (
++ 0.05,
++ _validate_float,
++ "Margin around layered sankey diagrams (axes-relative units).",
++ ),
++ "sankey.flow.alpha": (
++ 0.75,
++ _validate_float,
++ "Flow transparency for layered sankey diagrams.",
++ ),
++ "sankey.flow.curvature": (
++ 0.5,
++ _validate_float,
++ "Flow curvature for layered sankey diagrams.",
++ ),
++ "sankey.node.facecolor": (
++ "0.75",
++ _validate_color,
++ "Default node facecolor for layered sankey diagrams.",
++ ),
+ # Stylesheet
+ "style": (
+ None,
diff --git a/ultraplot/tests/test_plot.py b/ultraplot/tests/test_plot.py
index 1bcb69684..8846af873 100644
--- a/ultraplot/tests/test_plot.py
+++ b/ultraplot/tests/test_plot.py
@@ -722,6 +722,130 @@ def test_curved_quiver_color_and_cmap(rng, cmap):
return fig
+@pytest.mark.mpl_image_compare
+def test_sankey_basic():
+ """
+ Basic sanity check for Sankey diagrams.
+ """
+ fig, ax = uplt.subplots()
+ diagram = ax.sankey(
+ flows=[1.0, -0.6, -0.4],
+ labels=["in", "out_a", "out_b"],
+ orientations=[0, 1, -1],
+ trunklength=1.1,
+ )
+ from matplotlib.sankey import Sankey
+
+ assert isinstance(diagram, Sankey)
+ assert getattr(diagram, "patch", None) is not None
+ return fig
+
+
+@pytest.mark.mpl_image_compare
+def test_sankey_layered_nodes_flows():
+ """
+ Check that layered sankey accepts nodes and flows.
+ """
+ fig, ax = uplt.subplots()
+ nodes = ["Budget", "Ops", "R&D", "Marketing"]
+ flows = [
+ ("Budget", "Ops", 5),
+ ("Budget", "R&D", 3),
+ ("Budget", "Marketing", 2),
+ ]
+ diagram = ax.sankey(nodes=nodes, flows=flows)
+ assert len(diagram.nodes) == len(nodes)
+ assert len(diagram.flows) == len(flows)
+ return fig
+
+
+@pytest.mark.mpl_image_compare
+def test_sankey_layered_labels_and_style():
+ """
+ Check that style presets and label boxes are accepted.
+ """
+ fig, ax = uplt.subplots()
+ nodes = ["Budget", "Ops", "R&D", "Marketing"]
+ flows = [
+ ("Budget", "Ops", 5),
+ ("Budget", "R&D", 3),
+ ("Budget", "Marketing", 2),
+ ]
+ diagram = ax.sankey(
+ nodes=nodes,
+ flows=flows,
+ style="budget",
+ flow_labels=True,
+ value_format="{:.1f}",
+ node_label_box=True,
+ )
+ flow_label_keys = [key for key in diagram.labels if isinstance(key, tuple)]
+ assert flow_label_keys
+ return fig
+
+
+@pytest.mark.mpl_image_compare
+def test_sankey_basic():
+ """
+ Basic sanity check for Sankey diagrams.
+ """
+ fig, ax = uplt.subplots()
+ diagram = ax.sankey(
+ flows=[1.0, -0.6, -0.4],
+ labels=["in", "out_a", "out_b"],
+ orientations=[0, 1, -1],
+ trunklength=1.1,
+ )
+ from matplotlib.sankey import Sankey
+
+ assert isinstance(diagram, Sankey)
+ assert getattr(diagram, "patch", None) is not None
+ return fig
+
+
+@pytest.mark.mpl_image_compare
+def test_sankey_layered_nodes_flows():
+ """
+ Check that layered sankey accepts nodes and flows.
+ """
+ fig, ax = uplt.subplots()
+ nodes = ["Budget", "Ops", "R&D", "Marketing"]
+ flows = [
+ ("Budget", "Ops", 5),
+ ("Budget", "R&D", 3),
+ ("Budget", "Marketing", 2),
+ ]
+ diagram = ax.sankey(nodes=nodes, flows=flows)
+ assert len(diagram.nodes) == len(nodes)
+ assert len(diagram.flows) == len(flows)
+ return fig
+
+
+@pytest.mark.mpl_image_compare
+def test_sankey_layered_labels_and_style():
+ """
+ Check that style presets and label boxes are accepted.
+ """
+ fig, ax = uplt.subplots()
+ nodes = ["Budget", "Ops", "R&D", "Marketing"]
+ flows = [
+ ("Budget", "Ops", 5),
+ ("Budget", "R&D", 3),
+ ("Budget", "Marketing", 2),
+ ]
+ diagram = ax.sankey(
+ nodes=nodes,
+ flows=flows,
+ style="budget",
+ flow_labels=True,
+ value_format="{:.1f}",
+ node_label_box=True,
+ )
+ flow_label_keys = [key for key in diagram.labels if isinstance(key, tuple)]
+ assert flow_label_keys
+ return fig
+
+
def test_histogram_norms():
"""
Check that all histograms-like plotting functions