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Fixed colorbar bug when yscaled length is 1 by Andes0113 · Pull Request #23984 · matplotlib/matplotlib · GitHub

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Fixed colorbar bug when yscaled length is 1 #23984

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Fixed colorbar bug when yscaled length is 1 #23984

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0858774
Fixed colorbar bug when yscaled length is 1
Andes0113 Sep 22, 2022
1f2418a
Added test
Andes0113 Sep 22, 2022
3338d20
Fixed flake issue with test
Andes0113 Sep 22, 2022
b99e758
Added smoke test for gh#23817
Andes0113 Sep 29, 2022
b2e5dfa
Added smoke test for gh#23817
Andes0113 Sep 29, 2022
501c00a
Fixed uniformfield test
Andes0113 Oct 1, 2022
5e581f9
Added check for contoured uniform fields
Andes0113 Oct 2, 2022
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13 changes: 9 additions & 4 deletions lib/matplotlib/colorbar.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1221,8 +1221,10 @@ def _proportional_y(self):
if (isinstance(self.norm, colors.BoundaryNorm) or
self.boundaries is not None):
y = (self._boundaries - self._boundaries[self._inside][0])
y = y / (self._boundaries[self._inside][-1] -
self._boundaries[self._inside][0])
if (self._boundaries[self._inside][-1]
!= self._boundaries[self._inside][0]):
y = y / (self._boundaries[self._inside][-1] -
self._boundaries[self._inside][0])
# need yscaled the same as the axes scale to get
# the extend lengths.
if self.spacing == 'uniform':
Expand All @@ -1243,10 +1245,13 @@ def _proportional_y(self):
yscaled = np.ma.filled(norm(yscaled), np.nan)
# make the lower and upper extend lengths proportional to the lengths
# of the first and last boundary spacing (if extendfrac='auto'):
automin = yscaled[1] - yscaled[0]
automax = yscaled[-1] - yscaled[-2]
extendlength = [0, 0]
if self._extend_lower() or self._extend_upper():
automin = yscaled[0]
automax = yscaled[0]
if len(yscaled) > 1:
automin = yscaled[1] - yscaled[0]
automax = yscaled[-1] - yscaled[-2]
extendlength = self._get_extension_lengths(
self.extendfrac, automin, automax, default=0.05)
return y, extendlength
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9 changes: 9 additions & 0 deletions lib/matplotlib/tests/test_colorbar.py
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Expand Up @@ -242,6 +242,15 @@ def test_contour_colorbar():
fig.colorbar(CS, orientation='vertical')


def test_contour_uniformfield_colorbar():
# Smoke test for gh#23817
fig, ax = plt.subplots()
with pytest.warns(Warning) as record:
cs = ax.contour([[1, 1], [1, 1]])
assert len(record) == 1
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fig.colorbar(cs, ax=ax)


@image_comparison(['cbar_with_subplots_adjust.png'], remove_text=True,
savefig_kwarg={'dpi': 40})
def test_gridspec_make_colorbar():
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