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desowin opened this issue Mar 24, 2018 · 10 comments · Fixed by #12012
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RuntimeError: Cannot get window extent w/o renderer #10874

desowin opened this issue Mar 24, 2018 · 10 comments · Fixed by #12012
Milestone
v2.2.4

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@desowin
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desowin commented Mar 24, 2018

Bug report

Bug summary

Matplotlib 2.2.0 seems to introduce regression regarding the use of Agg renderer. In specific cases, get_window_extent() does raise RuntimeError: Cannot get window extent w/o renderer.

Code for reproduction

#!/usr/bin/env python3
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(111, frameon=True)
ax.plot()

# If the call to draw() below is removed, everything works
# However, this line cases xtick and ytick get_window_extent()
# to raise 'RuntimeError: Cannot get window extent w/o renderer'
# on matplotlib 2.2.0 (tested also on 2.2.2)
#
# Moreover, this works just fine with and without the call to
# draw() below, with matplotlib 2.1.2
plt.get_current_fig_manager().canvas.draw()

ax.set_xlabel(ax.get_xlabel()).get_window_extent()
ax.set_ylabel(ax.get_ylabel()).get_window_extent()
for xtick in ax.get_xticklabels():
    xtick.get_window_extent()
for ytick in ax.get_yticklabels():
    ytick.get_window_extent()

Actual outcome

Traceback (most recent call last):
  File "matplotlib-bug.py", line 22, in <module>
    xtick.get_window_extent()
  File "/usr/lib/python3.6/site-packages/matplotlib/text.py", line 920, in get_window_extent
    raise RuntimeError('Cannot get window extent w/o renderer')
RuntimeError: Cannot get window extent w/o renderer

Expected outcome

No exception should be raised. No exception is raised when the code is used with matplotlib 2.1.2.

Matplotlib version

  • Operating system: Arch Linux
  • Matplotlib version: 2.2.2
  • Matplotlib backend (print(matplotlib.get_backend())): agg
  • Python version: 3.6.4

Installed with pacman -S python python-matplotlib. Tested against older version of matplotlib by installing them in virtualenv using pip.
@desowin
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desowin commented Mar 24, 2018 •
edited
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The actual problem was noticed in https://bitbucket.org/zunzuncode/zunzunsite3. It manifests itself by the fact that no graphs are not rendered when running with matplotlib 2.2.2. The minimal code to reproduce the reported bug is the result of analyzing the zunzunsite3 code flow, removing all the unnecessary calls.

@anntzer
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anntzer commented Mar 24, 2018

bisects to #9452 (so I guess my fault, although what happened is unclear to me :/)

@jklymak
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jklymak commented Mar 25, 2018

I’m always confused about these fcns but I thought they all required a renderer.

@WeatherGod
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WeatherGod commented Mar 25, 2018 via email

@jklymak jklymak mentioned this issue Mar 26, 2018
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@jklymak
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jklymak commented Mar 26, 2018

See #10881 and the description of the issue....

@jklymak jklymak added this to the v3.0 milestone Mar 27, 2018
@jklymak
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jklymak commented Apr 8, 2018

Cross ref #5665

@jklymak jklymak mentioned this issue Apr 8, 2018
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@tacaswell tacaswell modified the milestones: v3.0, v3.1 Aug 11, 2018
@Abhijit-2592
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Abhijit-2592 commented Sep 3, 2018 •
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Is it solved yet?
I am getting the same error. issue persists in version 2.2.3 also. Works as intended with version 2.1.2

@jklymak
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jklymak commented Sep 3, 2018

No. See #10881 and #11004... But #11004 isn't merged yet.

It seems to me that xtick.get_window_extent() should just take a renderer kwarg as well.

@tacaswell tacaswell modified the milestones: v3.1, v2.2.4 Sep 4, 2018
@jklymak
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jklymak commented Sep 4, 2018

... as a work around until #11004 gets through (ping @efiring), or we ressurect #10881, you can explicitly supply the renderer and all works fine.

The problem here is that the outermost ticks are never drawn, so their renderer is never set, so the fallback for renderer=None in get_window_extent fails to find the correct renderer.

for xtick in ax.get_xticklabels():
    bb = xtick.get_window_extent(renderer=fig.canvas.get_renderer())
for ytick in ax.get_yticklabels():
    ytick.get_window_extent(renderer=fig.canvas.get_renderer())

@jklymak jklymak mentioned this issue Sep 4, 2018
Merged
6 tasks
@webermarcolivier webermarcolivier mentioned this issue Nov 30, 2018
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@DocBO
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DocBO commented Jan 6, 2019

Sorry for reopening but in my case in offsetbox.py get_window_extend(self, renderer=None) the line
renderer = self.figure._cachedRenderer was not the correct solution, therefore I run into the exact same issue.

Instead, as a workaround I tried
renderer = self.figure.canvas.get_renderer()
with success.

I have at the moment no time to go into deeper details or to create a new case. Sorry for that.

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FIX: fallback text renderer to fig._cachedRenderer, if none found jklymak/matplotlib
7 participants
@tacaswell @WeatherGod @desowin @anntzer @jklymak @DocBO @Abhijit-2592