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fix bug where make_compound_path kept all STOPs #16822

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Merged
merged 2 commits into from
Mar 19, 2020
Merged

fix bug where make_compound_path kept all STOPs #16822

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eb4b15b
fix bug where make_compound_path kept all STOPs
brunobeltran Mar 18, 2020
95b33b1
do not retain any STOPs in make_compound_path
brunobeltran Mar 18, 2020
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10 changes: 8 additions & 2 deletions lib/matplotlib/path.py
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Original file line number Diff line number Diff line change
Expand Up @@ -325,11 +325,13 @@ def make_compound_path_from_polys(cls, XY):

@classmethod
def make_compound_path(cls, *args):
"""Make a compound path from a list of Path objects."""
"""
Make a compound path from a list of Path objects. Blindly removes all
Path.STOP control points.
"""
# Handle an empty list in args (i.e. no args).
if not args:
return Path(np.empty([0, 2], dtype=np.float32))

vertices = np.concatenate([x.vertices for x in args])
codes = np.empty(len(vertices), dtype=cls.code_type)
i = 0
Expand All @@ -340,6 +342,10 @@ def make_compound_path(cls, *args):
else:
codes[i:i + len(path.codes)] = path.codes
i += len(path.vertices)
# remove STOP's, since internal STOPs are a bug
not_stop_mask = codes != cls.STOP
vertices = vertices[not_stop_mask, :]
codes = codes[not_stop_mask]

return cls(vertices, codes)

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9 changes: 9 additions & 0 deletions lib/matplotlib/tests/test_path.py
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Expand Up @@ -147,6 +147,15 @@ def test_make_compound_path_empty():
assert r.vertices.shape == (0, 2)


def test_make_compound_path_stops():
zero = [0, 0]
paths = 3*[Path([zero, zero], [Path.MOVETO, Path.STOP])]
compound_path = Path.make_compound_path(*paths)
# the choice to not preserve the terminal STOP is arbitrary, but
# documented, so we test that it is in fact respected here
assert np.sum(compound_path.codes == Path.STOP) == 0


@image_comparison(['xkcd.png'], remove_text=True)
def test_xkcd():
np.random.seed(0)
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