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Drawing the canvas does not populate ticklabels on MacOSX backend #19268
Description
Bug report
Bug summary
This is basically the same issue as #6103, but I have found that the "correct" approach selectively fails on the macosx backend. I decided to open a separate issue because there's a lot going on in the original thread.
(BTW I do support the suggestion in the original thread that get_{x/y}ticklabels should implicitly draw so that it always returns a sensible result).
Code for reproduction
import matplotlib.pyplot as plt
ax = plt.figure().subplots()
ax.plot(["a", "b", "c"], [1, 2, 3])
ax.figure.canvas.draw()
print(ax.get_xticklabels())Actual outcome
Using the MacOSX backend:
[Text(0, 0, ''), Text(0, 0, ''), Text(0, 0, '')]
Expected outcome
Using an agg-based backend:
[Text(0, 0, 'a'), Text(1, 0, 'b'), Text(2, 0, 'c')]
Matplotlib version
- Operating system:
- Matplotlib version: (import matplotlib; print(matplotlib.__version__)) 3.3.3
- Matplotlib backend (print(matplotlib.get_backend())): macosx
- Python version: 3.8
- Jupyter version (if applicable): n/a
- Other libraries: n/a
Activity
mwaskom commented on Jan 9, 2021
It occurs to me that this is maybe the same issue as #19197.
Indeed, s/ax.figure.canvas.draw()/ax.figure.draw(ax.figure.canvas.get_renderer())/ does produce the expected output, BUT, s/ax.figure.canvas.draw()/plt.draw() does not.
greglucas commented on Jan 10, 2022
The original issue was resolved by #21758
However, the plt.draw() from #19268 (comment) doesn't work with any interactive backends because it is using a draw_idle call: ax.figure.canvas.draw_idle(), and the event loop doesn't run to trigger a draw. I think we can close this as the macosx backend is consistent with the other backends and changing plt.draw() would be a separate issue.
jklymak commented on Jan 10, 2022
I think in current matplotlib we are suggesting fig.draw_without_rendering() as an easy user-accessible way of calling a draw. Though I agree that if the users is calling for the ticks, we should do a draw to give them the ticks.
greglucas commented on Mar 5, 2022
Closing as the original example is now fixed on main.
produces: