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FIX: colorbar minorticks when rcParams['x/ytick.minor.visible'] = True #16469

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Merged
merged 1 commit into from
Feb 11, 2020
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FIX: colorbar minorticks when rcParams['x/ytick.minor.visible'] = True #16469

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4 changes: 4 additions & 0 deletions lib/matplotlib/colorbar.py
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Original file line number Diff line number Diff line change
Expand Up @@ -517,8 +517,12 @@ def _config_axis(self):

if self.orientation == 'vertical':
long_axis, short_axis = ax.yaxis, ax.xaxis
if mpl.rcParams['ytick.minor.visible']:
self.minorticks_on()
else:
long_axis, short_axis = ax.xaxis, ax.yaxis
if mpl.rcParams['xtick.minor.visible']:
self.minorticks_on()

long_axis.set_label_position(self.ticklocation)
long_axis.set_ticks_position(self.ticklocation)
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28 changes: 28 additions & 0 deletions lib/matplotlib/tests/test_colorbar.py
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Expand Up @@ -327,6 +327,34 @@ def test_colorbar_minorticks_on_off():
np.testing.assert_equal(cbar.ax.yaxis.get_minorticklocs(), [])


def test_cbar_minorticks_for_rc_xyminortickvisible():
"""
issue gh-16468.

Making sure that minor ticks on the colorbar are turned on
(internally) using the cbar.minorticks_on() method when
rcParams['xtick.minor.visible'] = True (for horizontal cbar)
rcParams['ytick.minor.visible'] = True (for vertical cbar).
Using cbar.minorticks_on() ensures that the minor ticks
don't overflow into the extend regions of the colorbar.
"""

plt.rcParams['ytick.minor.visible'] = True
plt.rcParams['xtick.minor.visible'] = True

vmin, vmax = 0.4, 2.6
fig, ax = plt.subplots()
im = ax.pcolormesh([[1, 2]], vmin=vmin, vmax=vmax)

cbar = fig.colorbar(im, extend='both', orientation='vertical')
assert cbar.ax.yaxis.get_minorticklocs()[0] >= vmin
assert cbar.ax.yaxis.get_minorticklocs()[-1] <= vmax

cbar = fig.colorbar(im, extend='both', orientation='horizontal')
assert cbar.ax.xaxis.get_minorticklocs()[0] >= vmin
assert cbar.ax.xaxis.get_minorticklocs()[-1] <= vmax


def test_colorbar_autoticks():
# Test new autotick modes. Needs to be classic because
# non-classic doesn't go this route.
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