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incorrect cbar minor ticks for extend regions when x/ytick.minor.visible is True #16468

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pharshalp opened this issue Feb 11, 2020 · 0 comments · Fixed by #16469
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incorrect cbar minor ticks for extend regions when x/ytick.minor.visible is True #16468

pharshalp opened this issue Feb 11, 2020 · 0 comments · Fixed by #16469
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topic: color/colorbar
Milestone
v3.3.0

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@pharshalp
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pharshalp commented Feb 11, 2020 •
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Bug report

Bug summary
Colorbars have their own minorticks_on/off methods to address the issue of minorticks extending into the "extend" regions (see #11584).

Since colorbar axes are instances of normal axes, setting rcParams['y/xtick.minor.visible'] = True
results in minorticks being drawn on the colorbar axes using the axes methods (which don't take into account the "extend" regions).

Code for reproduction

import matplotlib.pyplot as plt
import numpy as np

# Making yticks longer in length to highlight the issue
plt.rcParams['ytick.major.size'] = 10
plt.rcParams['ytick.minor.size'] = 4
plt.rcParams['ytick.minor.visible'] = True
# Similar issue with plt.rcParams['xtick.minor.visible'] = True and horizontal colorbar

np.random.seed(seed=12345)
x = np.random.randn(20, 20)
fig, ax = plt.subplots(figsize=(4, 3), constrained_layout=True)
im = ax.pcolormesh(x)

cbar = fig.colorbar(im, extend='both', orientation='vertical')
# Similar issue with plt.rcParams['xtick.minor.visible'] = True and horizontal colorbar
fig.savefig('cbar_minorticks_issue.png')

Actual outcome
cbar_minorticks_issue

Expected outcome
cbar_minorticks_fixed

Matplotlib version

  • Operating system:
  • Matplotlib version:
  • Matplotlib backend (print(matplotlib.get_backend())):
  • Python version:
  • Jupyter version (if applicable):
  • Other libraries:
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topic: color/colorbar
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Milestone
v3.3.0
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FIX: colorbar minorticks when rcParams['x/ytick.minor.visible'] = True
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@anntzer @pharshalp