48 lines
1.8 KiB
Python
48 lines
1.8 KiB
Python
import numpy as np
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import pytest
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from matplotlib.testing.decorators import check_figures_equal
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from matplotlib import (
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collections as mcollections, patches as mpatches, path as mpath)
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@pytest.mark.backend('cairo')
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@check_figures_equal(extensions=["png"])
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def test_patch_alpha_coloring(fig_test, fig_ref):
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"""
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Test checks that the patch and collection are rendered with the specified
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alpha values in their facecolor and edgecolor.
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"""
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star = mpath.Path.unit_regular_star(6)
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circle = mpath.Path.unit_circle()
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# concatenate the star with an internal cutout of the circle
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verts = np.concatenate([circle.vertices, star.vertices[::-1]])
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codes = np.concatenate([circle.codes, star.codes])
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cut_star1 = mpath.Path(verts, codes)
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cut_star2 = mpath.Path(verts + 1, codes)
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# Reference: two separate patches
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ax = fig_ref.subplots()
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ax.set_xlim([-1, 2])
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ax.set_ylim([-1, 2])
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patch = mpatches.PathPatch(cut_star1,
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linewidth=5, linestyle='dashdot',
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facecolor=(1, 0, 0, 0.5),
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edgecolor=(0, 0, 1, 0.75))
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ax.add_patch(patch)
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patch = mpatches.PathPatch(cut_star2,
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linewidth=5, linestyle='dashdot',
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facecolor=(1, 0, 0, 0.5),
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edgecolor=(0, 0, 1, 0.75))
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ax.add_patch(patch)
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# Test: path collection
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ax = fig_test.subplots()
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ax.set_xlim([-1, 2])
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ax.set_ylim([-1, 2])
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col = mcollections.PathCollection([cut_star1, cut_star2],
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linewidth=5, linestyles='dashdot',
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facecolor=(1, 0, 0, 0.5),
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edgecolor=(0, 0, 1, 0.75))
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ax.add_collection(col)
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