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Commit27adcbd

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Merge pull requestmatplotlib#30636 from timhoffm/fix-violin-artist-alpha
FIX: Keep legacy alpha behavior for violinplot without facecolor
2 parentsf783a69 +f70a4a2 commit27adcbd

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2 files changed

+45
-4
lines changed

2 files changed

+45
-4
lines changed

‎lib/matplotlib/axes/_axes.py‎

Lines changed: 14 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -8967,6 +8967,14 @@ def violin(self, vpstats, positions=None, vert=None,
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.. versionadded:: 3.11
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For backward compatibility, if *facecolor* is not given, the body
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will get an Artist-level transparency `alpha <.Artist.set_alpha>`
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of 0.3, which will persist if you afterwards change the facecolor,
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e.g. via ``result['bodies'][0].set_facecolor('red')``.
8974+
If *facecolor* is given, there is no Artist-level transparency.
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To set transparency for *facecolor* or *edgecolor* use
8976+
``(color, alpha)`` tuples.
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linecolor : :mpltype:`color` or list of :mpltype:`color`, optional
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If provided, will set the line color(s) of the violins (the
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horizontal and vertical spines and body edges).
@@ -9074,13 +9082,14 @@ def cycle_color(color, alpha=None):
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iffacecolorisnotNone:
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facecolor=cycle_color(facecolor)
9085+
body_artist_alpha=None
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else:
9078-
default_facealpha=0.3
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body_artist_alpha=0.3
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# Use default colors if user doesn't provide them
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ifmpl.rcParams['_internal.classic_mode']:
9081-
facecolor=cycle_color('y',alpha=default_facealpha)
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facecolor=cycle_color('y')
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else:
9083-
facecolor=cycle_color(next_color,alpha=default_facealpha)
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facecolor=cycle_color(next_color)
90849093

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ifmpl.rcParams['_internal.classic_mode']:
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# Classic mode uses patch.force_edgecolor=True, so we need to
@@ -9129,7 +9138,8 @@ def cycle_color(color, alpha=None):
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bodies+= [fill(stats['coords'],
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-vals+posifsidein ['both','low']elsepos,
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vals+posifsidein ['both','high']elsepos,
9132-
facecolor=facecolor,edgecolor=body_edgecolor)]
9141+
facecolor=facecolor,edgecolor=body_edgecolor,
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alpha=body_artist_alpha)]
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means.append(stats['mean'])
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mins.append(stats['min'])
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maxes.append(stats['max'])

‎lib/matplotlib/tests/test_axes.py‎

Lines changed: 31 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -4181,6 +4181,10 @@ def color_violins(parts, facecolor=None, linecolor=None):
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iffacecolorisnotNone:
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forpcinparts['bodies']:
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pc.set_facecolor(facecolor)
4184+
# disable alpha Artist property to counter the legacy behavior
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# that applies an alpha of 0.3 to the bodies if no facecolor
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# was set
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pc.set_alpha(None)
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iflinecolorisnotNone:
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forpartnamein ('cbars','cmins','cmaxes','cmeans','cmedians'):
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ifpartnameinparts:
@@ -4238,6 +4242,33 @@ def assert_colors_equal(colors1, colors2):
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assert_colors_equal(colors_test,mcolors.to_rgba_array(linecolors))
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4245+
deftest_violinplot_alpha():
4246+
matplotlib.style.use('default')
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data= [(np.random.normal(0,1,100))]
4248+
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fig,ax=plt.subplots()
4250+
parts=ax.violinplot(data,positions=[1])
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# Case 1: If facecolor is unspecified, it's the first color from the color cycle
4253+
# with Artist-level alpha=0.3
4254+
facecolor= ('y'ifmpl.rcParams['_internal.classic_mode']
4255+
elseplt.rcParams['axes.prop_cycle'].by_key()['color'][0])
4256+
assertmcolors.same_color(parts['bodies'][0].get_facecolor(), (facecolor,0.3))
4257+
assertparts['bodies'][0].get_alpha()==0.3
4258+
# setting a new facecolor maintains the alpha
4259+
parts['bodies'][0].set_facecolor('red')
4260+
assertmcolors.same_color(parts['bodies'][0].get_facecolor(), ('red',0.3))
4261+
4262+
# Case 2: If facecolor is explicitly given, it's alpha does not become an
4263+
# Artist property
4264+
parts=ax.violinplot(data,positions=[1],facecolor=('blue',0.3))
4265+
assertmcolors.same_color(parts['bodies'][0].get_facecolor(), ('blue',0.3))
4266+
assertparts['bodies'][0].get_alpha()isNone
4267+
# so setting a new color does not maintain the alpha
4268+
parts['bodies'][0].set_facecolor('red')
4269+
assertmcolors.same_color(parts['bodies'][0].get_facecolor(),'red')
4270+
4271+
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@check_figures_equal()
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deftest_violinplot_single_list_quantiles(fig_test,fig_ref):
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# Ensures quantile list for 1D can be passed in as single list

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