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In scatter, fix single rgb edgecolors handling #19539

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Merged
merged 1 commit into from
Feb 19, 2021
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In scatter, fix single rgb edgecolors handling #19539

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5 changes: 5 additions & 0 deletions lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4507,6 +4507,11 @@ def scatter(self, x, y, s=None, c=None, marker=None, cmap=None, norm=None,
x, y, s, c, colors, edgecolors, linewidths = \
cbook._combine_masks(
x, y, s, c, colors, edgecolors, linewidths)
# Unmask edgecolors if it was actually a single RGB or RGBA.
if (x.size in (3, 4)
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Do we need a similar block for colors as well?

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I believe that is already an (N,4) array out of _parse_scatter_color_args and should have broadcast correctly with the masks.

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No, because the case that was problematic for colors was the case where edgecolors was being
set from colors, above all this. So handling edgecolors here takes care of it.

and np.ma.is_masked(edgecolors)
and not np.ma.is_masked(orig_edgecolor)):
edgecolors = edgecolors.data

scales = s # Renamed for readability below.

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9 changes: 9 additions & 0 deletions lib/matplotlib/tests/test_axes.py
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Expand Up @@ -2172,6 +2172,15 @@ def test_scatter_size_arg_size(self):
with pytest.raises(ValueError, match='float array-like'):
plt.scatter(x, x, 'foo')

def test_scatter_edgecolor_RGB(self):
# Github issue 19066
coll = plt.scatter([1, 2, 3], [1, np.nan, np.nan],
edgecolor=(1, 0, 0))
assert mcolors.same_color(coll.get_edgecolor(), (1, 0, 0))
coll = plt.scatter([1, 2, 3, 4], [1, np.nan, np.nan, 1],
edgecolor=(1, 0, 0, 1))
assert mcolors.same_color(coll.get_edgecolor(), (1, 0, 0, 1))

@check_figures_equal(extensions=["png"])
def test_scatter_invalid_color(self, fig_test, fig_ref):
ax = fig_test.subplots()
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