On 04/26/2013 02:57 AM, Werner F. Bruhin wrote: > Hi, > > Anyone can provide some info on what "agg.buffer_rgba" returns and maybe > even some suggestion on how to resolve this issue in the wxagg backend.
It returns a Python buffer object on Python 2, though on Python 3 it is a memoryview, since buffer was deprecated. Perhaps wx is also doing something different depending on the version of Python. > > Thanks > Werner > > P.S. > The archive on Sourceforge for this list stops in June 2012, noticed > this as I wanted to check if there are answers I didn't get for some reason. > http://sourceforge.net/mailarchive/forum.php?forum_name=matplotlib-users Yeah -- I've reported that to sourceforge many times. Not sure what the issue is. Personally, I use gmane when I need to search the archive and it works rather well. Mike > > On 20/04/2013 08:58, Werner F. Bruhin wrote: >> 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()) >> >> ------------------------------------------------------------------------------ >> Precog is a next-generation analytics platform capable of advanced >> analytics on semi-structured data. 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