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legend.get_window_extent() fails #21285
Description
Bug summary
It seems a bug has crept in with points_to_pixels not available as a function called by get_window_extent
Code for reproduction
(Pdb) leg2 = plt.legend(loc='upper left', ncol=2, fontsize=8)
(Pdb) leg2.get_window_extent()
*** AttributeError: 'NoneType' object has no attribute 'points_to_pixels'
(Pdb) print(matplotlib.__version__)
3.4.2
(Pdb) print(matplotlib.get_backend())
MacOSX
(Pdb) import sys; print(sys.version_info)
sys.version_info(major=3, minor=9, micro=6, releaselevel='final', serial=0)
$ jupyter --version
jupyter core : 4.7.1
jupyter-notebook : 6.4.0
qtconsole : 5.1.1
ipython : 7.25.0
ipykernel : 6.0.1
jupyter client : 6.1.12
jupyter lab : not installed
nbconvert : 6.1.0
ipywidgets : 7.6.3
nbformat : 5.1.3
traitlets : 5.0.5Actual outcome
Error, as above
Expected outcome
I expected to get coords
Operating system
MacOS 11.6
Matplotlib Version
3.4.2
Matplotlib Backend
MacOSX
Python version
3.9.6
Jupyter version
core 4.7.1; notebook 6.4.0
Other libraries
No response
Installation
conda
Conda channel
conda-forge
Activity
jklymak commented on Oct 6, 2021
get_window_extent has a renderer argument. Its optional for some methods and required by others. If it is set to None it uses the cached renderer, but that requires a draw to have been executed first. In this case you have no draw, so the call fails.
I'm skeptical this ever worked. If so, can you tell us what version? Maybe the renderer cache has changed in some way.
In the meantime, it is safest to call leg2.get_window_extent(fig.canvas.get_renderer()).
QuLogic commented on Jan 25, 2023
I believe this was fixed by #22745.