|
| 1 | +import numpy as np |
| 2 | +from io import BytesIO |
| 3 | +import os |
| 4 | +import tempfile |
| 5 | +import warnings |
| 6 | +import xml.parsers.expat |
| 7 | + |
| 8 | +import pytest |
| 9 | + |
| 10 | +import matplotlib.pyplot as plt |
| 11 | +from matplotlib.testing.decorators import check_figures_equal |
| 12 | +import matplotlib |
| 13 | +from matplotlib import ( |
| 14 | + collections as mcollections, patches as mpatches, path as mpath) |
| 15 | + |
| 16 | +@pytest.mark.backend('cairo') |
| 17 | +@check_figures_equal(extensions=["png"]) |
| 18 | +def test_patch_alpha_coloring(fig_test, fig_ref): |
| 19 | + """ |
| 20 | + Test checks that the patch and collection are rendered with the specified |
| 21 | + alpha values in their facecolor and edgecolor. |
| 22 | + """ |
| 23 | + star = mpath.Path.unit_regular_star(6) |
| 24 | + circle = mpath.Path.unit_circle() |
| 25 | + # concatenate the star with an internal cutout of the circle |
| 26 | + verts = np.concatenate([circle.vertices, star.vertices[::-1]]) |
| 27 | + codes = np.concatenate([circle.codes, star.codes]) |
| 28 | + cut_star1 = mpath.Path(verts, codes) |
| 29 | + cut_star2 = mpath.Path(verts + 1, codes) |
| 30 | + |
| 31 | + # Reference: two separate patches |
| 32 | + ax = fig_ref.subplots() |
| 33 | + ax.set_xlim([-1, 2]) |
| 34 | + ax.set_ylim([-1, 2]) |
| 35 | + patch = mpatches.PathPatch(cut_star1, |
| 36 | + linewidth=5, linestyle=&#
B547
39;dashdot', |
| 37 | + facecolor=(1, 0, 0, 0.5), |
| 38 | + edgecolor=(0, 0, 1, 0.75)) |
| 39 | + ax.add_patch(patch) |
| 40 | + patch = mpatches.PathPatch(cut_star2, |
| 41 | + linewidth=5, linestyle='dashdot', |
| 42 | + facecolor=(1, 0, 0, 0.5), |
| 43 | + edgecolor=(0, 0, 1, 0.75)) |
| 44 | + ax.add_patch(patch) |
| 45 | + plt.savefig('patch_alpha_coloring.png') |
| 46 | + |
| 47 | + # Test: path collection |
| 48 | + ax = fig_test.subplots() |
| 49 | + ax.set_xlim([-1, 2]) |
| 50 | + ax.set_ylim([-1, 2]) |
| 51 | + col = mcollections.PathCollection([cut_star1, cut_star2], |
| 52 | + linewidth=5, linestyles='dashdot', |
| 53 | + facecolor=(1, 0, 0, 0.5), |
| 54 | + edgecolor=(0, 0, 1, 0.75)) |
| 55 | + ax.add_collection(col) |
| 56 | + |
| 57 | + plt.savefig('patch_alpha_coloring_test.png') |
| 58 | + |
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