With the qt4agg backend, I also get no cursor with "useblit=False", but
when "useblit=True" it seems to work just fine -- I don't see any
shearing. By shearing I assume you mean the image is warped like a
parallelogram? Or do mean tearing, in that it isn't updating fast
enough? (FWIW, I don't see either).
What versions of Qt do you have? I've got:
Qt: Qt: 3.3.3, PyQt: 3.17.2
Qt4: Qt: 4.3.0, PyQt4: 4.2
Cheers,
Mike
Darren Dale wrote:
> I am having some trouble with the Cursor widget with the qt4agg backend. Here
> is a short script which works with the gtkagg backend with useblit either
> true or false:
>
> ----------
> from matplotlib import rcParams
> rcParams['backend']='gtkagg'
> from pylab import *
> from matplotlib.widgets import Cursor
>
> t = arange(0.0, 1.0, 0.01)
> s = sin(2*2*pi*t)
> ax = subplot(111)
>
> cursor = Cursor(ax, useblit=True)
>
> ax.plot(t, s, 'o')
> axis([0,1,-1,1])
> show()
> ------------
>
> If I use the qt4agg backend, with useblit False, the cursor lines do not
> render. If useblit is True, the lines render but the pixmap inside the axes
> is sheared. I've been looking at the backend_qt4agg code, the widgets.Cursor
> code, and the working animation_blit_qt4 example, but I'm stuck. Does anyone
> have any ideas?
>
> Thanks,
> Darren
>
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--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
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