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axvspan broken in PDF backend #2087

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jacobmerson opened this issue May 29, 2013 · 4 comments
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axvspan broken in PDF backend #2087

jacobmerson opened this issue May 29, 2013 · 4 comments
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status: needs clarification Issues that need more information to resolve.

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@jacobmerson
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When using the pdf backend adding an axvspan causes an error. The full traceback is below:

File "run.py", line 27, in
experiment.savePlots('/home/mersoj/Documents/', 'multiPlots')
File "/home/mersoj/Documents/Research/forceanalysis_update/experiment.py", line 175, in savePlots
bbox_inches='tight')
File "/usr/lib/python3.3/site-packages/matplotlib/figure.py", line 1371, in savefig
self.canvas.print_figure(_args, *_kwargs)
File "/usr/lib/python3.3/site-packages/matplotlib/backend_bases.py", line 2055, in print_figure
*_kwargs)
File "/usr/lib/python3.3/site-packages/matplotlib/backend_bases.py", line 1848, in print_pdf
return pdf.print_pdf(_args, *_kwargs)
File "/usr/lib/python3.3/site-packages/matplotlib/backends/backend_pdf.py", line 2301, in print_pdf
self.figure.draw(renderer)
File "/usr/lib/python3.3/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
draw(artist, renderer, *args, *_kwargs)
File "/usr/lib/python3.3/site-packages/matplotlib/figure.py", line 1007, in draw
func(_args)
File "/usr/lib/python3.3/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
draw(artist, renderer, *args, *_kwargs)
File "/usr/lib/python3.3/site-packages/matplotlib/axes.py", line 2088, in draw
a.draw(renderer)
File "/usr/lib/python3.3/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
draw(artist, renderer, _args, *_kwargs)
File "/usr/lib/python3.3/site-packages/matplotlib/patches.py", line 442, in draw
renderer.draw_path(gc, tpath, affine, rgbFace)
File "/usr/lib/python3.3/site-packages/matplotlib/backends/backend_pdf.py", line 1520, in draw_path
self.file.output(self.gc.paint())
File "/usr/lib/python3.3/site-packages/matplotlib/backends/backend_pdf.py", line 2032, in paint
return Op.paint_path(False, self.fillp(), self.strokep())
File "/usr/lib/python3.3/site-packages/matplotlib/backends/backend_pdf.py", line 2002, in strokep
return (self._linewidth > 0 and self._alpha > 0 and
TypeError: unorderable types: str() > int()
@mdboom
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mdboom commented May 29, 2013

Can you provide a simple, self-contained example that reproduces the error? For example, the following works for me:

import matplotlib.pyplot as plt

plt.axvspan(0.1, 0.2)
plt.savefig("test.pdf")

@jacobmerson
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It seems that the error relates to parsing the arguments. For the other backends no errors were thrown when I used alpha as a string (I copied this from a tutorial somewhere). The pdf backend however does not accept the alpha as a string.

This works with other backends.

    import matplotlib.pyplot as plt
    plt.axvspan(0.1, 0.2, alpha='.5')

@efiring
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efiring commented May 30, 2013

Alpha should be a number between 0 and 1; the tutorial where you found it given as a string is wrong. I have not been able to reproduce with master your reported behavior in which it is accepted as a string for some backends.

@mdboom
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mdboom commented May 31, 2013

Ditto to what @efiring said, but like #2096 which is also about not validating inputs very well, I hope MEP13 can address these sorts of things in the long run.

@mdboom mdboom closed this as completed Jun 3, 2013
@certik certik mentioned this issue Dec 4, 2014
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@mdboom @efiring @jacobmerson