Thread: [Matplotlib-users] backend_agg attribute error

Hi list members
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I have been trying to upgrade my Python version to 2.4 from 2.3. With
that I removed numarray and Numeric and installed numpy. My Matplotlib,
Scipy and wxPython was also upgraded to comply with Python 2.4. In the
process I encountered a few problems and all but one I managed to
overcome by using CVS versions of Matplotlib.
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With the last problem I am bit clueless. I use Boa Cocstructor to write
the application that I am busy with and for embedded plotting I am using
wxmpl (although Ken McIver said that it has not been tested for Python
2.4). After I run the application and try to plot, nothing shows except
the crosshair when I move accross the area where the axes is suppose to
be and Boa returns the following error message:
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Traceback (most recent call last):
File "C:\Program Files\Python24\Lib\site-packages\wxmpl.py", line 1067,
in _onPaint
FigureCanvasWxAgg._onPaint(self, evt)
File "C:\Program
Files\Python24\lib\site-packages\matplotlib\backends\backend_wx.py",
line 1048, in _onPaint
self.draw(repaint=3DFalse)
File "C:\Program Files\Python24\Lib\site-packages\wxmpl.py", line 1124,
in draw
FigureCanvasWxAgg.draw(self, repaint)
File "C:\Program
Files\Python24\lib\site-packages\matplotlib\backends\backend_wxagg.py",
line 60, in draw
FigureCanvasAgg.draw(self)
File "C:\Program
Files\Python24\lib\site-packages\matplotlib\backends\backend_agg.py",
line 385, in draw
renderer =3D self.get_renderer()
File "C:\Program
Files\Python24\lib\site-packages\matplotlib\backends\backend_agg.py",
line 396, in get_renderer
self.renderer =3D RendererAgg(w, h, self.figure.dpi)
File "C:\Program
Files\Python24\lib\site-packages\matplotlib\backends\backend_agg.py",
line 124, in __init__
self.draw_quad_mesh =3D self._renderer.draw_quad_mesh
AttributeError: draw_quad_mesh
Any suggestions? I did get some similar problems when I tried to run
the embedded examples embedding_in_wx2.py, embedding_in_wx3.py and
embedding_in_wx4.py that I downloaded with my previous Matplotlib
version.
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Regards
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Johann Strauss

> File "C:\Program
> Files\Python24\lib\site-packages\matplotlib\backends\backend_agg.py",
> line 124, in __init__
>
> self.draw_quad_mesh =3D self._renderer.draw_quad_mesh
>
> AttributeError: draw_quad_mesh
This was added to the agg (which affects wxagg) backend between 0.86.1
and 0.86.2. This error is probably not coming from wxmpl/boa. See if
you can run the examples/quadmesh_demo.py which uses this new
functionality, after reinstalling the latest mpl.