Re: [matplotlib-devel] Bugs in Qt4 backend with the latest PyQt release

[william r. <wil...@gm...>]

Hi!  I just installed matplotlib version .99 (windows vista, python25,
32bit) and found that
this line was missing:
QtGui.qApp.processEvents()

Adding it sped the QT4Agg backend back to reasonable speeds--but it still
seems a bit slow.  Otherwise, I am using the excellent Python(x,y) 2.1.14
release for my python distribution on this machine.  Could this line be
added back?

Cheers,
William


On Tue, Aug 19, 2008 at 4:58 AM, Pierre Raybaut <co...@py...>wrote:

> Hi Darren,
>
> 2008/8/18 Darren Dale <dsd...@gm...>:
> > 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.
>
> Good work Darren, thanks, it works perfectly!
> That is great news because I found (and reported) this bug three
> months ago, so I was beginning to worry about the future of Qt4
> backend.
> Now I can consider updating PyQt in Python(x,y).
>
> > I forgot to mention, the svg icons display fine for me with windows xp,
> > matplotlib-0.98.
>
> Forget about it, I've just found out that this is related to one of my
> own-made packages.
>
> Thanks
> Pierre
>
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