Problem plotting interactively from PyCrust

Community matplotlib-users
1

Hello,

I'm running the latest matplotlib (and wxPython) with Python 2.5.2 on Win
XP. Everything works fine, the plotting quality is excellent, and
interactive plotting works nicely with IPython.

However, I much prefer the PyCrust interactive terminal and use it a lot. I
tried following the directions
(http://matplotlib.sourceforge.net/interactive.html) for interactive
plotting from PyCrust:

  >>> import matplotlib
  >>> matplotlib.interactive(True)
  >>> matplotlib.use('WX')
  >>> from matplotlib.pylab import *
  >>> plot([1,2,3])
  >>> xlabel('time (s)')

Unfortunately, this does not work. After I call "plot", an empty plot window
appears and the following is printed:

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 1947, in
plot
    b = ishold()
  File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 396, in
ishold
    return gca().ishold()
  File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 496, in
gca
    ax = gcf().gca(**kwargs)
  File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 218, in
gcf
    return figure()
  File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 208, in
figure
    draw_if_interactive()
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_wx.py",
line 1179, in draw_if_interactive
    figManager.canvas.draw()
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_wx.py",
line 901, in draw
    self.figure.draw(self.renderer)
  File "C:\Python25\Lib\site-packages\matplotlib\figure.py", line 797, in
draw
    if self.frameon: self.figurePatch.draw(renderer)
  File "C:\Python25\Lib\site-packages\matplotlib\patches.py", line 239, in
draw
    gc = renderer.new_gc()
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_wx.py",
line 361, in new_gc
    self.gc.select()
  File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_wx.py",
line 475, in select
    self.SelectObject(self.bitmap)
AttributeError: GraphicsContextWx instance has no attribute 'SelectObject'

Any ideas on how to make this work ?
Thanks in advance
Eli

···

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2

Does it work if you "use" 'WxAgg' instead? wxagg is the
recommended/supported wx plotting backend.

JDH

···

On Sat, Jul 26, 2008 at 3:33 AM, eliben <eliben@...287...> wrote:

Hello,

I'm running the latest matplotlib (and wxPython) with Python 2.5.2 on Win
XP. Everything works fine, the plotting quality is excellent, and
interactive plotting works nicely with IPython.

However, I much prefer the PyCrust interactive terminal and use it a lot. I
tried following the directions
(http://matplotlib.sourceforge.net/interactive.html) for interactive
plotting from PyCrust:

>>> import matplotlib
>>> matplotlib.interactive(True)
>>> matplotlib.use('WX')
>>> from matplotlib.pylab import *
>>> plot([1,2,3])

3

John Hunter-4 wrote:

Hello,

I'm running the latest matplotlib (and wxPython) with Python 2.5.2 on Win
XP. Everything works fine, the plotting quality is excellent, and
interactive plotting works nicely with IPython.

However, I much prefer the PyCrust interactive terminal and use it a lot.
I
tried following the directions
(http://matplotlib.sourceforge.net/interactive.html) for interactive
plotting from PyCrust:

>>> import matplotlib
>>> matplotlib.interactive(True)
>>> matplotlib.use('WX')
>>> from matplotlib.pylab import *
>>> plot([1,2,3])

Does it work if you "use" 'WxAgg' instead? wxagg is the
recommended/supported wx plotting backend.

JDH

Hello,

Yes, WXAgg works.
What is the difference between WXAgg and WX backends ? I couldn't find any
real documentation on the subject and I would really like to know. Can WX do
something WXAgg can't ?

Thanks
Eli

···

On Sat, Jul 26, 2008 at 3:33 AM, eliben <eliben@...287...> wrote:

--
View this message in context: http://www.nabble.com/Problem-plotting-interactively-from-PyCrust-tp18664574p18669376.html
Sent from the matplotlib - users mailing list archive at Nabble.com.

4

WXAgg is the full featured wx backend, wx has limited support for all
of matplotlib's features. Agg is the antigrain C++ rendering library
(http://antigrain.com) that is the standard matplotlib raster backend.
See http://matplotlib.sourceforge.net/doc/html/faq/installing_faq.html#id1
for details.

JDH

···

On Sat, Jul 26, 2008 at 12:55 PM, eliben <eliben@...287...> wrote:

Yes, WXAgg works.
What is the difference between WXAgg and WX backends ? I couldn't find any
real documentation on the subject and I would really like to know. Can WX do
something WXAgg can't ?