matplotlib-devel Mailing List for matplotlib

Steve Chaplin wrote:
> Using the latest cairo (git), pycairo (cvs) and matplotlib (svn) and
> running examples/simple_plot.py I get a 22K PDF file. But when I try to
> view it with evince and xpdf I get "unable to open document" type
> errors.
This is just a shot in the dark, but I've been playing with pycairo a 
bit, and found that you need to make sure to call:
cairo.Context.show_page()
When you're done with the rendering. I had similar symptoms before I did 
that.
John,
What are your plans regarding Cairo and the future of rendering for MPL? 
I'm in the need of alpha blended rendering for wxPython stuff, so I've 
been looking at Cairo and Agg. Agg is a great solution for really nice 
rendering, but Cairo has the promise of supporting everything else I 
need, like PDF for instance.
Now that Mozilla seems to be adopting Cairo, it might even live up to 
the promise of a fully cross-platform solution. If so, it would be great 
to develop a really general purpose, robust, numpy-aware, pythonic 
interface for it.
-Chris
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On Sunday 26 February 2006 13:54, Ted Drain wrote:
> Hmm - I just ran your test and everything seems to work fine. I'm using
> MPL 0.85 and Qt 3.3.5. I did a diff of backend_qt.py and backend_qtagg.py
> from 0.85 to the current CVS repository and they're identical. So I'm not
> sure what could be going on...
Maybe this is not an issue with qt-3.3.5. 
Another datapoint: when I run the embedding_in_qt.py example, the size of the 
window is correct.
> At 10:30 AM 2/26/2006, Darren Dale wrote:
> >On Sunday 26 February 2006 1:06 pm, Ted Drain wrote:
> > > Darren,
> > > I'll have someone take a look at it soon. We're right in the middle of
> > > a big delivery so we don't really have a lot of time to spend on this
> > > right now...
> >
> >Thanks, Ted. I'm not in a rush.
> >
> >I'm about to start my first python-based gui project, and want to use Qt.
> >I'll
> >also continue to poke around at these problems myself as I find time.
> >
> >Darren
> >
> > > At 08:20 AM 2/26/2006, Darren Dale wrote:
> > > >Respectfully: Is the QtAgg backend supported?
> > > >
> > > >On Saturday 18 February 2006 6:01 pm, Darren Dale wrote:
> > > > > I'm having two problems with the QtAgg backend. If I do:
> > > > > >>> from pylab import *
> > > > > >>> plot([1,2])
> > > > >
> > > > > [<matplotlib.lines.Line2D instance at 0x2aaab1ead830>]
> > > > >
> > > > > >>> show()
> > > > >
> > > > > My figure window should be 8in x 6in, but instead it is 6in tall
> > > > > and as wide as my screen will allow. So thats the first issue. The
> > > > > second is this: if I close that window, and then do
> > > > >
> > > > > >>> plot([1,2])
> > > > >
> > > > > [<matplotlib.lines.Line2D instance at 0x2aaab1ebbcf8>]
> > > > >
> > > > > >>> show()
> > > > >
> > > > > I get the following traceback:
> > > > >
> > > > > Traceback (most recent call last):
> > > > > File "<stdin>", line 1, in ?
> > > > > File
> > > > > "/usr/lib64/python2.4/site-packages/matplotlib/backends/backend_qt.
> > > > >py", line 47, in show
> > > > > manager.window.show()
> > > > > RuntimeError: underlying C/C++ object has been deleted
> > > > >
> > > > > I'm using qt version 3.3.4, with cvs mpl 0.86.2, on a gentoo linux
> > > > > system. The only nondefault rc setting is the choice of backend.
> > > > >
> > > > > Darren
> > > > >
> > > > >
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