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BUG: fix ListedColormap._resample, hence plt.get_cmap; closes #6025 #6036

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Merged
merged 1 commit into from
Feb 21, 2016
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BUG: fix ListedColormap._resample, hence plt.get_cmap; closes #6025 #6036

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3 changes: 2 additions & 1 deletion lib/matplotlib/colors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -852,7 +852,8 @@ def _resample(self, lutsize):
"""
Return a new color map with *lutsize* entries.
"""
return ListedColormap(self.name, self.colors, lutsize)
colors = self(np.linspace(0, 1, lutsize))
return ListedColormap(colors, name=self.name)


class Normalize(object):
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22 changes: 22 additions & 0 deletions lib/matplotlib/tests/test_colors.py
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Expand Up @@ -18,6 +18,28 @@
cleanup, knownfailureif)


def test_resample():
"""
Github issue #6025 pointed to incorrect ListedColormap._resample;
here we test the method for LinearSegmentedColormap as well.
"""
n = 101
colorlist = np.empty((n, 4), float)
colorlist[:, 0] = np.linspace(0, 1, n)
colorlist[:, 1] = 0.2
colorlist[:, 2] = np.linspace(1, 0, n)
colorlist[:, 3] = 0.7
lsc = mcolors.LinearSegmentedColormap.from_list('lsc', colorlist)
lc = mcolors.ListedColormap(colorlist)
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)


def test_colormap_endian():
"""
Github issue #1005: a bug in putmask caused erroneous
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