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FIX: fully invalidate TransformWrapper parents before swapping #25126

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Merged
merged 1 commit into from
Feb 2, 2023
Merged

FIX: fully invalidate TransformWrapper parents before swapping #25126

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16 changes: 15 additions & 1 deletion lib/matplotlib/tests/test_transforms.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@
import matplotlib.patches as mpatches
import matplotlib.transforms as mtransforms
from matplotlib.path import Path
from matplotlib.testing.decorators import image_comparison
from matplotlib.testing.decorators import image_comparison, check_figures_equal


def test_non_affine_caching():
Expand Down Expand Up @@ -730,3 +730,17 @@ def test_transformwrapper():
r"The input and output dims of the new child \(1, 1\) "
r"do not match those of current child \(2, 2\)")):
t.set(scale.LogTransform(10))


@check_figures_equal(extensions=["png"])
def test_scale_swapping(fig_test, fig_ref):
np.random.seed(19680801)
samples = np.random.normal(size=10)
x = np.linspace(-5, 5, 10)

for fig, log_state in zip([fig_test, fig_ref], [True, False]):
ax = fig.subplots()
ax.hist(samples, log=log_state, density=True)
ax.plot(x, np.exp(-(x**2) / 2) / np.sqrt(2 * np.pi))
fig.canvas.draw()
ax.set_yscale('linear')
1 change: 1 addition & 0 deletions lib/matplotlib/transforms.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1732,6 +1732,7 @@ def set(self, child):
dimensions as the current child.
"""
if hasattr(self, "_child"): # Absent during init.
self.invalidate()
new_dims = (child.input_dims, child.output_dims)
old_dims = (self._child.input_dims, self._child.output_dims)
if new_dims != old_dims:
Expand Down