Custom plots broken on hardy (LineCollection instance has no attribute 'get_lines')

[Daniel Bültmann]

Hi,

I tried to use the new export to Python function on hardy. The export itself works well, but after starting the script in a shell I get the following error in matplotlib. Version information is below

# python hansl.py
Accessing charts from database server with campaignId: 1586
Reading Campaign
Creating Facade: done
Found 2370 scenarios
Plotting: hansl
Traceback (most recent call last):
  File "hansl.py", line 55, in <module>
    if __name__ == '__main__': wrowser.FigurePlotter.loadCampaignAndPlotGraphs(PlotParameters)
  File "/home/dbn/src/openWNS/openwns-wrowser/wrowser/FigurePlotter.py", line 135, in loadCampaignAndPlotGraphs
    savefig(os.path.join(outputdir, PlotParameters.fileName+'.pdf'))
  File "/usr/lib/python2.5/site-packages/matplotlib/pyplot.py", line 269, in savefig
    return fig.savefig(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line 782, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/matplotlib/backend_bases.py", line 1195, in print_figure
    **kwargs)
  File "/usr/lib/python2.5/site-packages/matplotlib/backend_bases.py", line 1104, in print_pdf
    return pdf.print_pdf(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_pdf.py", line 1967, in print_pdf
    self.figure.draw(renderer)
  File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line 624, in draw
    for a in self.axes: a.draw(renderer)
  File "/usr/lib/python2.5/site-packages/matplotlib/axes.py", line 1345, in draw
    a.draw(renderer)
  File "/usr/lib/python2.5/site-packages/matplotlib/legend.py", line 236, in draw
    self._update_positions(renderer)
  File "/usr/lib/python2.5/site-packages/matplotlib/legend.py", line 579, in _update_positions
    ox, oy = self._find_best_position(w, h)
  File "/usr/lib/python2.5/site-packages/matplotlib/legend.py", line 463, in _find_best_position
    verts, bboxes, lines = self._auto_legend_data()
  File "/usr/lib/python2.5/site-packages/matplotlib/legend.py", line 378, in _auto_legend_data
    hlines = handle.get_lines()
AttributeError: LineCollection instance has no attribute 'get_lines'

# python
Python 2.5.2 (r252:60911, Jan 20 2010, 21:48:48)
[GCC 4.2.4 (Ubuntu 4.2.4-1ubuntu3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.

Matplotlib
>>> import matplotlib
>>> print matplotlib.__version__
0.91.2
>>>

Can you please try to make this work on hardy?

Regards,
  Daniel

[Ramin Rezai Rad (rrr-comnets)]

Hi Daniel,

can you please try to create a png file instead of the pdf file? To do so you can export with wrowser revision 63 (or you use an older revision and edit FigurePlotter.py) . In the generated script you can specify the output formats. I would like to know if this is only a problem with the pdf backend.

Another question: Did the script run on karmic without problems?

Best regards,
 Ramin

[Ramin Rezai Rad (rrr-comnets)]

Hi again,

this seems to be a bug in matplotlib that does not occur very often. A workaround seems to be to change the legendPosition parameter in the export file, from 'best' to another value like 'upper left'.

Best regards,
 Ramin