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[Bug]: Crash when adding clabels to subfigures #23173

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brckts opened this issue Jun 1, 2022 · 1 comment · Fixed by #23174
Closed

[Bug]: Crash when adding clabels to subfigures #23173

brckts opened this issue Jun 1, 2022 · 1 comment · Fixed by #23174
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status: confirmed bug topic: contour topic: figures and subfigures
Milestone
v3.5.3

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@brckts
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brckts commented Jun 1, 2022

Bug summary

Adding a clabel to a contour plot of a subfigure results in a traceback.

Code for reproduction

# Taken from the Contour Demo example
delta = 0.025
x = np.arange(-3.0, 3.0, delta)
y = np.arange(-2.0, 2.0, delta)
X, Y = np.meshgrid(x, y)
Z1 = np.exp(-(X**2) - Y**2)
Z2 = np.exp(-((X - 1) ** 2) - (Y - 1) ** 2)
Z = (Z1 - Z2) * 2

fig = plt.figure()
figs = fig.subfigures(nrows=1, ncols=2)

for f in figs:
    ax = f.subplots()
    CS = ax.contour(X, Y, Z)
    ax.clabel(CS, inline=True, fontsize=10)
    ax.set_title("Simplest default with labels")

plt.show()

Actual outcome

    ax.clabel(CS, inline=True, fontsize=10)
  File "/usr/lib/python3.9/site-packages/matplotlib/axes/_axes.py", line 6335, in clabel
    return CS.clabel(levels, **kwargs)
  File "/usr/lib/python3.9/site-packages/matplotlib/contour.py", line 235, in clabel
    self.labels(inline, inline_spacing)
  File "/usr/lib/python3.9/site-packages/matplotlib/contour.py", line 582, in labels
    lw = self._get_nth_label_width(idx)
  File "/usr/lib/python3.9/site-packages/matplotlib/contour.py", line 285, in _get_nth_label_width
    .get_window_extent(mpl.tight_layout.get_renderer(fig)).width)
  File "/usr/lib/python3.9/site-packages/matplotlib/tight_layout.py", line 206, in get_renderer
    if fig._cachedRenderer:
AttributeError: 'SubFigure' object has no attribute '_cachedRenderer'

Expected outcome

The two subfigures appearing side by side, each showing the Contour Demo example

Additional information

No response

Operating system

Gentoo

Matplotlib Version

3.5.2

Matplotlib Backend

QtAgg

Python version

3.9.13

Jupyter version

No response

Installation

Linux package manager
@oscargus oscargus added this to the v3.5.3 milestone Jun 1, 2022
@oscargus
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oscargus commented Jun 1, 2022 •
edited
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Not sure if one should add self._cachedRenderer = None to FigureBase (and remove in Figure) or to SubFigure init-functions, but that should fix it.

I thought it was a recent regression, but it doesn't look like it, so maybe should be labelled 3.6.0 instead?

@oscargus oscargus mentioned this issue Jun 1, 2022
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Labels
status: confirmed bug topic: contour topic: figures and subfigures
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Milestone
v3.5.3
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Make sure SubFigure has _cachedRenderer oscargus/matplotlib
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@oscargus @brckts