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Commit32c7d65

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ENH: Add a PolyQuadMesh for 2d meshes as Polygons
This adds a new collection PolyQuadMesh that is a combination ofa PolyCollection and QuadMesh, storing all of the coordinate dataand arrays through QuadMesh, but drawing each quad individuallythrough the PolyCollection.draw() method.The common mesh attributes and methods are stored in a privatemixin class _MeshData that is used for both QuadMesh and PolyQuadMesh.Additionally, this supports RGB(A) arrays for pcolor() calls now.Previously to update a pcolor array you would need to set only thecompressed values. This required keeping track of the mask by the user.For consistency with QuadMesh, we should only accept full 2D arraysthat include the mask if a user desires. This also allows for themask to be updated when setting an array.
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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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"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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"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.boxplot:1",
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"lib/matplotlib/pyplot.py:docstring of matplotlib.pyplot.figimage: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.spy:1",
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"lib/matplotlib/pyplot.py:docstring of matplotlib.pyplot.thetagrids:1",
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"lib/matplotlib/pyplot.py:docstring of matplotlib.pyplot.violinplot:1",
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],
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"Axes": [
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"lib/matplotlib/pyplot.py:docstring of matplotlib.pyplot.delaxes:1",
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"MarkerType": [
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],
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"_AxesBase": [
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"matplotlib.backend_bases.FigureCanvas": [
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"matplotlib.backend_bases._Backend": [
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"matplotlib.collections._MeshData": [
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],
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"matplotlib.image._ImageBase": [
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"mpl_toolkits.axes_grid1.axes_size._Base": [
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"mpl_toolkits.axes_grid1.parasite_axes.AxesHostAxes": [
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],
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"numpy.uint8": [
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"py:data": {
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"matplotlib.animation.ImageMagickWriter.isAvailable": [
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"doc/api/_as_gen/matplotlib.animation.ImageMagickWriter.rst:27:<autosummary>:1"
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],
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"matplotlib.animation.ImageMagickWriter.output_args": [
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"lib/matplotlib/animation.py:docstring of matplotlib.animation.ImageMagickWriter.input_names:1:<autosummary>:1"
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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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],
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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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