On Mon, May 19, 2008 at 2:36 AM, G Jones <[EMAIL PROTECTED]> wrote:
> Hello,
> I am experiencing a bug when trying to blit a canvas that contains two
> axes, one with a line plot and the other with an imshow plot. The
> attached example, QtBlitBugDemo.py demonstrates the problem. As is, on
> my machine, the
> imshow plot updates correctly, but the line plot acts like the
> background is not being restored correctly, the lines keep piling up
> on top of each other, even though I am explicitly restoring a clean
> background before drawing the artist. If I simply comment out the
> line:
> self.specPlotB.draw_artist(self.specArtistB)
> which draws the imshow artist, the line plot behaves correctly.
> I haven't been able to figure out what is causing this behavior.
> I am using r5186 from the SVN. The output from running with debug mode
> on is below.
I don't have qt installed so I can't test this here, but poking
through the code one thing looks badly wrong (though it may be
unrelated to your problem)
if self.autoSpec:
self.specPlotT.relim()
self.specPlotT.autoscale_view(scalex = False, scaley = True)
you cannot change the viewlim when updating your animated artists (nor
should you change the grid). The idea is
- draw (everything but animated by default)
-- copy the background
start animation loop:
* restore background
* update *only* your animated artists and change nothing else
about the figure (viewlim, grid, labels, etc)
* draw your animated artists
* blit
If you need to change anything else, you need to invoke a draw, then a
copy a new background, and then proceed through the animation loop.
Also, be aware that zorder is not respected for animated artists, so I
think you will want to update and draw your image before the lines.
JDH
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