On Monday 18 August 2008 16:17:03 Pierre Raybaut wrote:
> Darren Dale a écrit :
> >> If you need something to prove that this has nothing to do with my
> >> machine or my software, I can tell you that there is exactly the same
> >> bug on a virtual machine, after a clean Windows XP install, and using
> >> only the official Python MSI installer and the official PyQt installer
> >> (and the latest matplotlib release of course). I also saw the same bug
> >> on three other machines, but the real proof is the VM.
> >
> > I'm not familiar with virtual machines, so I guess I dont understand what
> > that proves. I'm looking for something that indicates this is an issue
> > with matplotlib and not Qt. You found a problem once you upgraded from
> > 4.3.3, but I have not seen a similar problem. I'll try running your test
> > script on a
>
> I've just received another proof (I know that it does not solve the
> problem, but I'm feeling less lonely!): a canadian Python/Qt user
> experienced exactly the same bug (and he did the test on three different
> machines, two with XP and one with Vista).
>
> > windows machine tonight, but in the meantime, perhaps you could try to
> > determine if there is a step in
> > backend_qt4agg.FigureCanvasQTAgg.paintEvent (or somewhere else) that is
> > the source of the bottleneck.
>
> What do you mean exactly?
Nevermind. It turns out its not exactly poor performance, but for some reason
the gui events were not getting processed as frequently on windows. Maybe Qt
changed something in an attempt to optimize performance.
I applied a patch in svn 6043, but its a really simple fix. At the end of
backend_qt4agg.FigureCanvasQTAgg.draw, after self.update(), add this line:
QtGui.qApp.processEvents()
It seemed to improve things on my windows laptop, but let me know if it fixes
the problem for you.
Darren
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