On Tue, Dec 1, 2009 at 4:51 PM, A.T.Hofkamp <[email protected]> wrote:
> nipun batra wrote: > >> Thanks >> This is my expose event function >> >> def expose(self, widget, event): >> >> cr = widget.window.cairo_create() >> cr.set_source_surface(self.surface, self.border, self.border) >> cr.paint() >> cr.set_source_rgb(0.5, 0, 0) >> >> #cr.paint() >> cr.rectangle(int(var1)*10,int(var2)*10,5,5) >> cr.fill() >> >> Here i am initially drawing the background image and over it i am drawing >> points.These come from two variables(global) which are updated every clock >> cycle.Now maintaining a list and plotting it would be tedious and not at all >> processor friendly.Could you elaborate a bit on the other technique.Using >> "dirty" regions. >> Thanks in advance >> >> > I think compared to drawing an image, drawing a few points seems not > relevant. > > I never used regions, but the idea is to mark an area as 'dirty' (eg the > area containing the new point). Then you will automatically get an expose > event, with the area that must be redrawn (probably somewhere in the 'event' > parameter). > You can skip drawing all points that are outside that area. > Ok..My code will be redrawing the background image apparently which is unneccesary.Still not clear with the dirty area concept.Can someone provide an example.Also how to integrate this widget as a part of a larger application using sizers
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