This kind of error typically occurs when the graphics context is being accessed
outside of the event loop. This may work for other backends, but on Mac OS X in
such a case the graphics context is not defined. The solution may involve
reorganizing tight_layout such that the graphics context is not being accessed
outside of the event loop.
-Michiel.
--- On Tue, 5/1/12, Elliot Saba <staticfl...@gmail.com> wrote:
From: Elliot Saba <staticfl...@gmail.com>
Subject: [Matplotlib-users] tight_layout() causes RuntimeError on OSX
To: "Matplotlib Users" <matplotlib-users@lists.sourceforge.net>
Date: Tuesday, May 1, 2012, 3:04 PM
Hey guys, I'm trying to use tight_layout() to fix up some subplot grossness,
but whenever I call it, I get:
Traceback (most recent call last):
File "test.py", line 16, in <module> plt.tight_layout() File
"/Users/<username>/.homebrew/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/pyplot.py",
line 1056, in tight_layout
fig.tight_layout(pad=pad, h_pad=h_pad, w_pad=w_pad) File
"/Users/<username>/.homebrew/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/figure.py",
line 1415, in tight_layout
pad=pad, h_pad=h_pad, w_pad=w_pad) File
"/Users/<username>/.homebrew/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/tight_layout.py",
line 117, in auto_adjust_subplotpars
tight_bbox_raw = union([ax.get_tightbbox(renderer) for ax in subplots])
File
"/Users/<username>/.homebrew/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/axes.py",
line 8396, in get_tightbbox
bb.append(self.title.get_window_extent(renderer)) File
"/Users/<username>/.homebrew/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/text.py",
line 743, in get_window_extent
bbox, info = self._get_layout(self._renderer) File
"/Users/<username>/.homebrew/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/text.py",
line 296, in _get_layout
ismath=False) File
"/Users/<username>/.homebrew/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/backend_macosx.py",
line 164, in get_text_width_height_descent
width, height, descent = self.gc.get_text_width_height_descent(unicode(s),
family, size, weight, style)RuntimeError: CGContextRef is NULL
I've googled around, but no answers have been found. Is this a known issue,
and if it's not, how can I go about fixing it?
Thanks,-E
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