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Title: VectorMappable with data type objects by trygvrad · Pull Request #28428 · matplotlib/matplotlib · GitHub

Open Graph Title: VectorMappable with data type objects by trygvrad · Pull Request #28428 · matplotlib/matplotlib

X Title: VectorMappable with data type objects by trygvrad · Pull Request #28428 · matplotlib/matplotlib

Description: Creation of the VectorMappable class **NOTE: This PR builds upon the BivarColormap and MultivarColormap classes introduced in ** #28454 PR summary This PR has been in development during 2024 GSOC as a responese to #14168 Feature request: Bivariate colormapping. This requires the introduction of multiple new classes, and changes to different parts of the codebase. It has therefore been suggested to introduce this functionality over multiple PRs, so that the changes are easier to review this is the 1st of 3(?) PRs that will resolve #14168. The end goal of this is to allow for the following funcitonality: fig, axes = plt.subplots(1, 2, figsize = (12,4)) pm = axes[0].pcolormesh((A,B,C), cmap = '3VarSubA', vmax = (0.4, 0.6, 0.5)) cb0, cb1, cb2 = fig.colorbars(pm, shape = (-1,2)) axes[0].set_title('Subtractive multivariate colormap') pm = axes[1].pcolormesh((A,B,C), cmap = '3VarAddA', vmax = (0.4, 0.6, 0.5)) cb0, cb1, cb2 = fig.colorbars(pm, shape = (-1,2)) axes[1].set_title('Additive multivariate colormap') fig, axes = plt.subplots(1, 2, figsize = (12,4)) pm = axes[0].pcolormesh((im0,im1), cmap = 'BiOrangeBlue', vmin = -1, vmax = 1) cax = fig.colorbar_2D(pm, shape = (-1,2)) axes[0].set_title('Square 2d colormap') pm = axes[1].pcolormesh((im0,im1), cmap = 'BiCone', vmin = -1, vmax = 1) cax = fig.colorbar_2D(pm, shape = (-1,2)) axes[1].set_title('Circular 2d colormap') The current class hierarchy can be visualized as follows: This PR proposes to replace ScalarMappable with a new class VectorMappable, so that multivariate functionality can be inherited by all the relevant plotting methods, as shows below. This includes support for multiple norms (the private variable ._norm always stores a list), support for multiple arguments to .set_vmin(), .set_vmax(), changes to .to_rgba() to support bivariate and multivariate colormaps, as well as support functions to parse multivariate data (top level functions in cm.py). This PR does not contain the changes needed in the plotting functions and docs. These will follow a separate PR, as outlined in the figure above. (a (slightly outdated) full implementation is available in the branch here) PR checklist [¹] "closes #14168" is in the body of the PR description to link the related issue [¹] new and changed code is tested [¹] Plotting related features are demonstrated in an example New Features and API Changes are noted with a directive and release note Documentation complies with general and docstring guidelines ¹This is the 2nd out of a series of PRs, and cannot by itself close #14168. Most features are tested, but some private functions do not have complete tests, as they are better tested in a later PR where the private API is tested via the publicly available API (colors._ensure_multivariate_params() etc.)

Open Graph Description: Creation of the VectorMappable class **NOTE: This PR builds upon the BivarColormap and MultivarColormap classes introduced in ** #28454 PR summary This PR has been in development during 2024 GSOC a...

X Description: Creation of the VectorMappable class **NOTE: This PR builds upon the BivarColormap and MultivarColormap classes introduced in ** #28454 PR summary This PR has been in development during 2024 GSOC a...

Opengraph URL: https://github.com/matplotlib/matplotlib/pull/28428

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