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FIX: Prevent set_alpha from changing color of legend patch #22009

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Merged
merged 1 commit into from
Dec 21, 2021
Merged

FIX: Prevent set_alpha from changing color of legend patch #22009

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2 changes: 2 additions & 0 deletions lib/matplotlib/legend_handler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -788,6 +788,8 @@ def get_first(prop_array):
# Directly set Patch color attributes (must be RGBA tuples).
legend_handle._facecolor = first_color(orig_handle.get_facecolor())
legend_handle._edgecolor = first_color(orig_handle.get_edgecolor())
legend_handle._original_facecolor = orig_handle._original_facecolor
legend_handle._original_edgecolor = orig_handle._original_edgecolor
legend_handle._fill = orig_handle.get_fill()
legend_handle._hatch = orig_handle.get_hatch()
# Hatch color is anomalous in having no getters and setters.
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8 changes: 8 additions & 0 deletions lib/matplotlib/tests/test_legend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -879,3 +879,11 @@ def test_subfigure_legend():
ax.plot([0, 1], [0, 1], label="line")
leg = subfig.legend()
assert leg.figure is subfig


def test_setting_alpha_keeps_polycollection_color():
pc = plt.fill_between([0, 1], [2, 3], color='#123456', label='label')
patch = plt.legend().get_patches()[0]
patch.set_alpha(0.5)
assert patch.get_facecolor()[:3] == tuple(pc.get_facecolor()[0][:3])
assert patch.get_edgecolor()[:3] == tuple(pc.get_edgecolor()[0][:3])