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jklymakjklymak
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Merge pull request #25027 from greglucas/pcolor-2dmesh
Make pcolor more mesh-like
2 parents 4b0cf04 + 8f3aa89 commit d59d7e5

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‎doc/api/next_api_changes/deprecations/25027-GL.rst

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The object returned by ``pcolor()`` has changed to a ``PolyQuadMesh`` class
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The old object was a `.PolyCollection` with flattened vertices and array data.
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The new `.PolyQuadMesh` class subclasses `.PolyCollection`, but adds in better
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2D coordinate and array handling in alignment with `.QuadMesh`. Previously, if
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a masked array was input, the list of polygons within the collection would shrink
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to the size of valid polygons and users were required to keep track of which
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polygons were drawn and call ``set_array()`` with the smaller "compressed" array size.
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Passing the "compressed" and flattened array values is now deprecated and the
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full 2D array of values (including the mask) should be passed
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to `.PolyQuadMesh.set_array`.

‎doc/missing-references.json

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"lib/matplotlib/colorbar.py:docstring of matplotlib.colorbar:1"
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],
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],
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"lib/mpl_toolkits/axes_grid1/anchored_artists.py:docstring of mpl_toolkits.axes_grid1.anchored_artists.AnchoredSizeBar:4"
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],
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],
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],
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],
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],
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"max": [
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"lib/matplotlib/transforms.py:docstring of matplotlib.transforms:1"
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"lib/matplotlib/pyplot.py:docstring of matplotlib.pyplot.specgram:1",
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"lib/matplotlib/pyplot.py:docstring of matplotlib.pyplot.violinplot:1",
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"ColorType": [
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],
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"matplotlib.backend_bases.FigureCanvas": [
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"matplotlib.backend_bases._Backend": [
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],
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"matplotlib.collections._MeshData": [
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],
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],
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],
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],
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],
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},
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"matplotlib.animation.ImageMagickWriter.saving": [
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"doc/api/_as_gen/matplotlib.animation.ImageMagickWriter.rst:27:<autosummary>:1"
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],

‎doc/users/next_whats_new/polyquadmesh.rst

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``PolyQuadMesh`` is a new class for drawing quadrilateral meshes
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----------------------------------------------------------------
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`~.Axes.pcolor` previously returned a flattened `.PolyCollection` with only
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the valid polygons (unmasked) contained within it. Now, we return a `.PolyQuadMesh`,
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which is a mixin incorporating the usefulness of 2D array and mesh coordinates
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handling, but still inheriting the draw methods of `.PolyCollection`, which enables
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more control over the rendering properties than a normal `.QuadMesh` that is
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returned from `~.Axes.pcolormesh`. The new class subclasses `.PolyCollection` and thus
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should still behave the same as before. This new class keeps track of the mask for
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the user and updates the Polygons that are sent to the renderer appropriately.
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.. plot::
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arr = np.arange(12).reshape((3, 4))
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fig, ax = plt.subplots()
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pc = ax.pcolor(arr)
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# Mask one element and show that the hatch is also not drawn
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# over that region
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pc.set_array(np.ma.masked_equal(arr, 5))
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pc.set_hatch('//')
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plt.show()

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