[Matplotlib-users] wxPython Phoenix - backend_wxagg

[Werner F. B. <wer...@fr...>]

Hi,

I am trying to get matplotlib 1.2.0 to work with wxPython Phoenix - will 
provide a patch when it is working.

Made the changes to backend_wx* for things like EmptyImage/EmptyBitmap 
and Toolbar but I am stuck on the following.

     if bbox is None:
         # agg => rgba buffer -> bitmap
         if 'phoenix' in wx.PlatformInfo:
             return wx.Bitmap.FromBufferRGBA(int(agg.width), 
int(agg.height),
memoryview(agg.buffer_rgba()))
         else:
             return wx.BitmapFromBufferRGBA(int(agg.width), int(agg.height),
                                            agg.buffer_rgba())
     else:
         # agg => rgba buffer -> bitmap => clipped bitmap
         return _WX28_clipped_agg_as_bitmap(agg, bbox)

TypeError: cannot make memory view because object does not have the 
buffer interface
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 63, in 
<module>
   demo()
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 60, in demo
   app.MainLoop()
File "c:\Python27\Lib\site-packages\wx-2.9.6-msw-phoenix\wx\core.py", 
line 1841, in MainLoop
   rv = wx.PyApp.MainLoop(self)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wx.py", 
line 1209, in _onPaint
   self.draw(drawDC=drawDC)
File 
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py", 
line 61, in draw
   self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
File 
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py", 
line 173, in _convert_agg_to_wx_bitmap
   memoryview(agg.buffer_rgba()))

I tried using "memoryview" based on a suggestion by Robin Dunn, and 
based on the following info I see in the debugger that should work no?

agg.buffer_rgba()
<read-write buffer ptr 0x05400638, size 229200 at 0x055FC680>
type(agg.buffer_rgba())
<type 'buffer'>
agg
<matplotlib.backends.backend_agg.RendererAgg instance at 0x04BA0670>

If I don't use "memoryview" (which would probably be preferred) I get 
the following exception.

Can someone help us figure this one out.

Thanks
Werner


TypeError: Bitmap.FromBufferRGBA(): argument 3 has unexpected type 'buffer'
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 63, in 
<module>
   demo()
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 60, in demo
   app.MainLoop()
File "c:\Python27\Lib\site-packages\wx-2.9.6-msw-phoenix\wx\core.py", 
line 1841, in MainLoop
   rv = wx.PyApp.MainLoop(self)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wx.py", 
line 1209, in _onPaint
   self.draw(drawDC=drawDC)
File 
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py", 
line 61, in draw
   self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
File 
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py", 
line 173, in _convert_agg_to_wx_bitmap
   agg.buffer_rgba())