Closed
Description
Bug summary
Previously working plotting code has broken. It fails on 96ddc67 / #22569 but passes on the parent daaa1ed.
Code for reproduction
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax.plot([0, 1], [0, 1], ls=(0, ()))
plt.show()Actual outcome
No line shown, error while drawing
File "/home/larsoner/python/matplotlib/lib/matplotlib/backends/backend_qt.py", line 479, in _draw_idle
self.draw()
File "/home/larsoner/python/matplotlib/lib/matplotlib/backends/backend_agg.py", line 424, in draw
self.figure.draw(self.renderer)
File "/home/larsoner/python/matplotlib/lib/matplotlib/artist.py", line 73, in draw_wrapper
result = draw(artist, renderer, *args, **kwargs)
File "/home/larsoner/python/matplotlib/lib/matplotlib/artist.py", line 50, in draw_wrapper
return draw(artist, renderer)
File "/home/larsoner/python/matplotlib/lib/matplotlib/figure.py", line 2860, in draw
mimage._draw_list_compositing_images(
File "/home/larsoner/python/matplotlib/lib/matplotlib/image.py", line 131, in _draw_list_compositing_images
a.draw(renderer)
File "/home/larsoner/python/matplotlib/lib/matplotlib/artist.py", line 50, in draw_wrapper
return draw(artist, renderer)
File "/home/larsoner/python/matplotlib/lib/matplotlib/axes/_base.py", line 3101, in draw
mimage._draw_list_compositing_images(
File "/home/larsoner/python/matplotlib/lib/matplotlib/image.py", line 131, in _draw_list_compositing_images
a.draw(renderer)
File "/home/larsoner/python/matplotlib/lib/matplotlib/artist.py", line 50, in draw_wrapper
return draw(artist, renderer)
File "/home/larsoner/python/matplotlib/lib/matplotlib/lines.py", line 772, in draw
gc.set_dashes(*self._dash_pattern)
File "/home/larsoner/python/matplotlib/lib/matplotlib/backend_bases.py", line 930, in set_dashes
raise ValueError(
ValueError: At least one value in the dash list must be positive
Expected outcome
Line shown
Additional information
Maybe we use a weird/bad/incorrect convention in our code by creating ls=(0, ()) and we can certainly work around it/fix it, but it used to work at least! At a minimum it might be nice to raise a nicer error if possible...
Operating system
Ubuntu 22.04
Matplotlib Version
Matplotlib Backend
QtAgg (PyQt6)
Python version
3.10.4
Jupyter version
No response
Installation
git checkout
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