matplotlib-users Mailing List for matplotlib

This may be known, but the following modified example from
http://matplotlib.org/mpl_toolkits/mplot3d/tutorial.html fails with a
TypeError at matplotlib/backends/backend_pdf.pyc in draw_path_collection.
 Is it possible to save pdf files with surface plots?
from mpl_toolkits.mplot3d import Axes3D
from matplotlib import cm
from matplotlib.ticker import LinearLocator, FormatStrFormatter
import matplotlib.pyplot as plt
import numpy as np
fig = plt.figure()
ax = fig.gca(projection='3d')
X = np.arange(-5, 5, 0.25)
Y = np.arange(-5, 5, 0.25)
X, Y = np.meshgrid(X, Y)
R = np.sqrt(X**2 + Y**2)
Z = np.sin(R)
surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1, cmap=cm.coolwarm,
 linewidth=0, antialiased=False)
ax.set_zlim(-1.01, 1.01)
ax.zaxis.set_major_locator(LinearLocator(10))
ax.zaxis.set_major_formatter(FormatStrFormatter('%.02f'))
fig.colorbar(surf, shrink=0.5, aspect=5)
fig.savefig('test.pdf')
plt.show()

On 04/19/2013 03:26 AM, Mark Lawrence wrote:
> On 19/04/2013 04:03, John Ladasky wrote:
>
>> Reading more, I realize that the way I was getting GUI output previously
>> (with Python 2.7 and Matplotlib 1.1) was through wxPython.
>> Unfortunately, it appears that wxPython's star is fading, and a Python
>> 3-compatible version will not be written. In fact, wxPython hasn't
>> released a new version in nine months.
>>
> I'm surprised that you say this as months of work have gone into
> updating wxPython to make in Python 3 compatible. Please see
> http://wxpython.org/Phoenix/snapshot-builds/ for the latest and greatest.
>
Well, that is good news. Just before my last message to this list, I 
visited wxpython.org, as I have done many times over the years. I saw no 
announcement that there would be a Python 3.x-compatible version. You 
would think that the developers would want everyone to know!

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())