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turn off the grid after creating colorbar axes #22216

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Merged
merged 1 commit into from
Jan 14, 2022
Merged

turn off the grid after creating colorbar axes #22216

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1 change: 1 addition & 0 deletions lib/matplotlib/figure.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1143,6 +1143,7 @@ def colorbar(
cax, kwargs = cbar.make_axes_gridspec(ax, **kwargs)
else:
cax, kwargs = cbar.make_axes(ax, **kwargs)
cax.grid(visible=False, which='both', axis='both')
else:
userax = True

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12 changes: 12 additions & 0 deletions lib/matplotlib/tests/test_colorbar.py
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Expand Up @@ -938,3 +938,15 @@ def test_boundaries():
fig, ax = plt.subplots(figsize=(2, 2))
pc = ax.pcolormesh(np.random.randn(10, 10), cmap='RdBu_r')
cb = fig.colorbar(pc, ax=ax, boundaries=np.linspace(-3, 3, 7))


def test_colorbar_no_warning_rcparams_grid_true():
# github issue #21723 - If mpl style has 'axes.grid' = True,
# fig.colorbar raises a warning about Auto-removal of grids
# by pcolor() and pcolormesh(). This is fixed by PR #22216.
plt.rcParams['axes.grid'] = True
fig, ax = plt.subplots()
ax.grid(False)
im = ax.pcolormesh([0, 1], [0, 1], [[1]])
# make sure that no warning is raised by fig.colorbar
fig.colorbar(im)