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Setting imshow(animated=True) still show does not show an image #30052

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Setting imshow(animated=True) still show does not show an image #30052

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c998fd8
remove if image from composting
alphanoobie May 14, 2025
6882aa5
test if draw is called
alphanoobie May 14, 2025
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2 changes: 1 addition & 1 deletion lib/matplotlib/axes/_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3174,7 +3174,7 @@ def draw(self, renderer):
if not self.get_figure(root=True).canvas.is_saving():
artists = [
a for a in artists
if not a.get_animated() or isinstance(a, mimage.AxesImage)]
if not a.get_animated()]
artists = sorted(artists, key=attrgetter('zorder'))

# rasterize artists with negative zorder
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22 changes: 21 additions & 1 deletion lib/matplotlib/tests/test_axes.py
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Expand Up @@ -37,13 +37,14 @@
import matplotlib.text as mtext
import matplotlib.ticker as mticker
import matplotlib.transforms as mtransforms
from matplotlib.backends.backend_agg import FigureCanvasAgg
import mpl_toolkits.axisartist as AA # type: ignore[import]
from numpy.testing import (
assert_allclose, assert_array_equal, assert_array_almost_equal)
from matplotlib.testing.decorators import (
image_comparison, check_figures_equal, remove_ticks_and_titles)
from matplotlib.testing._markers import needs_usetex

from unittest.mock import MagicMock
# Note: Some test cases are run twice: once normally and once with labeled data
# These two must be defined in the same test function or need to have
# different baseline images to prevent race conditions when pytest runs
Expand Down Expand Up @@ -9753,3 +9754,22 @@ def test_pie_all_zeros():
fig, ax = plt.subplots()
with pytest.raises(ValueError, match="All wedge sizes are zero"):
ax.pie([0, 0], labels=["A", "B"])


def test_animated_artists_not_drawn_by_default():
fig, (ax1, ax2) = plt.subplots(ncols=2)
canvas = FigureCanvasAgg(fig)

imdata = np.random.random((20, 20))
lndata = imdata[0]

im = ax1.imshow(imdata, animated=True)
(ln,) = ax2.plot(lndata, animated=True)

im.draw = MagicMock(name="im.draw")
ln.draw = MagicMock(name="ln.draw")

canvas.draw()

im.draw.assert_not_called()
ln.draw.assert_not_called()
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