[osgeo4w-dev] [osgeo4w] #213: Qt4Agg backend broken in matplotlib

[OSGeo4W]

#213: Qt4Agg backend broken in matplotlib
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Reporter:  goyodiaz  |       Owner:  osgeo4w-dev@…              
    Type:  defect    |      Status:  new                        
Priority:  major     |   Component:  Package                    
 Version:            |    Keywords:                             
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 {{{
 D:\>python
 Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
 (Intel)] on
 win32
 Type "help", "copyright", "credits" or "license" for more information.
 >>> import matplotlib as mpl
 >>> mpl.use('Qt4Agg')
 >>> import matplotlib.pyplot as plt
 >>> plt.plot([1, 2])
 [<matplotlib.lines.Line2D object at 0x0180FB90>]
 >>> plt.show()
 Traceback (most recent call last):
   File "D:\OSGeo4w\apps\Python25\lib\site-
 packages\matplotlib\backends\backend_q
 t4.py", line 168, in resizeEvent
     self.draw()
   File "D:\OSGeo4w\apps\Python25\lib\site-
 packages\matplotlib\backends\backend_q
 t4agg.py", line 130, in draw
     FigureCanvasAgg.draw(self)
   File "D:\OSGeo4w\apps\Python25\lib\site-
 packages\matplotlib\backends\backend_a
 gg.py", line 313, in draw
     self.renderer = self.get_renderer()
   File "D:\OSGeo4w\apps\Python25\lib\site-
 packages\matplotlib\backends\backend_a
 gg.py", line 319, in get_renderer
     try: self._lastKey, self.renderer
 TypeError: 'sip.methoddescriptor' object is not callable
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "D:\OSGeo4w\apps\Python25\lib\site-
 packages\matplotlib\backends\backend_q
 t4.py", line 69, in show
     figManager.canvas.draw()
   File "D:\OSGeo4w\apps\Python25\lib\site-
 packages\matplotlib\backends\backend_q
 t4agg.py", line 130, in draw
     FigureCanvasAgg.draw(self)
   File "D:\OSGeo4w\apps\Python25\lib\site-
 packages\matplotlib\backends\backend_a
 gg.py", line 313, in draw
     self.renderer = self.get_renderer()
   File "D:\OSGeo4w\apps\Python25\lib\site-
 packages\matplotlib\backends\backend_a
 gg.py", line 319, in get_renderer
     try: self._lastKey, self.renderer
 TypeError: 'sip.methoddescriptor' object is not callable
 >>> Traceback (most recent call last):
   File "D:\OSGeo4w\apps\Python25\lib\site-
 packages\matplotlib\backends\backend_q
 t4agg.py", line 83, in paintEvent
     FigureCanvasAgg.draw(self)
   File "D:\OSGeo4w\apps\Python25\lib\site-
 packages\matplotlib\backends\backend_a
 gg.py", line 313, in draw
     self.renderer = self.get_renderer()
   File "D:\OSGeo4w\apps\Python25\lib\site-
 packages\matplotlib\backends\backend_a
 gg.py", line 319, in get_renderer
     try: self._lastKey, self.renderer
 TypeError: 'sip.methoddescriptor' object is not callable
 }}}

 The offending line is testing for attributes existence. The next line
 catches AttributeError but now a TypeError is raised. Catching TypeError
 in line 320 seems to solve this.

 Before:
 {{{
 try: self._lastKey, self.renderer
 except AttributeError: need_new_renderer = True
 else:  need_new_renderer = (self._lastKey != key)
 }}}

 After
 {{{
 try: self._lastKey, self.renderer
 except (AttributeError, TypeError): need_new_renderer = True
 else:  need_new_renderer = (self._lastKey != key)
 }}}

-- 
Ticket URL: <http://trac.osgeo.org/osgeo4w/ticket/213>
OSGeo4W <http://trac.osgeo.org/osgeo4w>
OSGeo4W is the Windows installer for the OSGeo stack.