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Making sure to keep over/under/bad in cmap resample/reverse. #16937

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Merged
merged 1 commit into from
Mar 28, 2020
Merged

Making sure to keep over/under/bad in cmap resample/reverse. #16937

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28 changes: 24 additions & 4 deletions lib/matplotlib/colors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -790,7 +790,12 @@ def from_list(name, colors, N=256, gamma=1.0):

def _resample(self, lutsize):
"""Return a new color map with *lutsize* entries."""
return LinearSegmentedColormap(self.name, self._segmentdata, lutsize)
new_cmap = LinearSegmentedColormap(self.name, self._segmentdata,
lutsize)
new_cmap._rgba_over = self._rgba_over
new_cmap._rgba_under = self._rgba_under
new_cmap._rgba_bad = self._rgba_bad
return new_cmap

# Helper ensuring picklability of the reversed cmap.
@staticmethod
Expand Down Expand Up @@ -821,7 +826,12 @@ def reversed(self, name=None):
[(1.0 - x, y1, y0) for x, y0, y1 in reversed(data)])
for key, data in self._segmentdata.items()}

return LinearSegmentedColormap(name, data_r, self.N, self._gamma)
new_cmap = LinearSegmentedColormap(name, data_r, self.N, self._gamma)
# Reverse the over/under values too
new_cmap._rgba_over = self._rgba_under
new_cmap._rgba_under = self._rgba_over
new_cmap._rgba_bad = self._rgba_bad
return new_cmap


class ListedColormap(Colormap):
Expand Down Expand Up @@ -885,7 +895,12 @@ def _init(self):
def _resample(self, lutsize):
"""Return a new color map with *lutsize* entries."""
colors = self(np.linspace(0, 1, lutsize))
return ListedColormap(colors, name=self.name)
new_cmap = ListedColormap(colors, name=self.name)
# Keep the over/under values too
new_cmap._rgba_over = self._rgba_over
new_cmap._rgba_under = self._rgba_under
new_cmap._rgba_bad = self._rgba_bad
return new_cmap

def reversed(self, name=None):
"""
Expand All @@ -906,7 +921,12 @@ def reversed(self, name=None):
name = self.name + "_r"

colors_r = list(reversed(self.colors))
return ListedColormap(colors_r, name=name, N=self.N)
new_cmap = ListedColormap(colors_r, name=name, N=self.N)
# Reverse the over/under values too
new_cmap._rgba_over = self._rgba_under
new_cmap._rgba_under = self._rgba_over
new_cmap._rgba_bad = self._rgba_bad
return new_cmap


class Normalize:
Expand Down
16 changes: 16 additions & 0 deletions lib/matplotlib/tests/test_colors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -39,13 +39,25 @@ def test_resample():
colorlist[:, 3] = 0.7
lsc = mcolors.LinearSegmentedColormap.from_list('lsc', colorlist)
lc = mcolors.ListedColormap(colorlist)
# Set some bad values for testing too
for cmap in [lsc, lc]:
cmap.set_under('r')
cmap.set_over('g')
cmap.set_bad('b')
lsc3 = lsc._resample(3)
lc3 = lc._resample(3)
expected = np.array([[0.0, 0.2, 1.0, 0.7],
[0.5, 0.2, 0.5, 0.7],
[1.0, 0.2, 0.0, 0.7]], float)
assert_array_almost_equal(lsc3([0, 0.5, 1]), expected)
assert_array_almost_equal(lc3([0, 0.5, 1]), expected)
# Test over/under was copied properly
assert_array_almost_equal(lsc(np.inf), lsc3(np.inf))
assert_array_almost_equal(lsc(-np.inf), lsc3(-np.inf))
assert_array_almost_equal(lsc(np.nan), lsc3(np.nan))
assert_array_almost_equal(lc(np.inf), lc3(np.inf))
assert_array_almost_equal(lc(-np.inf), lc3(-np.inf))
assert_array_almost_equal(lc(np.nan), lc3(np.nan))


def test_register_cmap():
Expand Down Expand Up @@ -818,6 +830,10 @@ def test_colormap_reversing(name):
cmap._init()
cmap_r._init()
assert_array_almost_equal(cmap._lut[:-3], cmap_r._lut[-4::-1])
# Test the bad, over, under values too
assert_array_almost_equal(cmap(-np.inf), cmap_r(np.inf))
assert_array_almost_equal(cmap(np.inf), cmap_r(-np.inf))
assert_array_almost_equal(cmap(np.nan), cmap_r(np.nan))


def test_cn():
Expand Down