Gregor Thalhammer wrote:
> for repainting a matplotlib figure, every time a repaint is done also
> the bitmap is rerendered:
>
> backend_wx.py/_onPaint():
> ...
> # Render to the bitmap
> self.draw(repaint=False)
> ...
You're quite right -- the paint handler should only blit to the
PaintDC, which, in this case, is:
self.gui_repaint(drawDC=wx.PaintDC(self))
However, if I comment out that call to self.draw, I get a blank screen
in a wxmpl app of mine. If I re-size the Window, then it gets draw
('cause the OnSize handler is re-drawing).
Also, in the same app, even when I call Figure.draw(), I'm notgetting it
updated.
So it looks like there is code counting on this extra draw call.
I'll poke into it a bit more, it may be somethign we can fix in wxmpl,
if there aren't issues elsewhere.
-Chris
> This also affects the behaviour of the wxagg backend.
yes, it looks like _onPaint is inherited from FigureCanvasWx, so it's
the same issue.
Rerendering and
> therefore also repainting gets quite slow if, e.g., images are included
> in the figure. I can see this by simply dragging another window across
> the matplotlibfigure. Commenting out the rerendering I get a much
> smoother behaviour. I could not observe problems except that sometimes
> some parts of the figure are not properly repainted if the matplotlib
> figure is in the background (I only tested the wxagg backend). Therefore
> it seems that this rerendering every time a repaint is performed is not
> really necessary and should be avoided.
>
> I tested this on matplotlib 0.91.2 on WinXP, Python 2.5, wx 2.8.7. I
> checked that in the current svn version the _onPaint() function is
> unchanged.
>
> Gregor
>
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