I have a several classes, all derived from a single base class Artist,
which render into a gtk.gdk.Drawable with a call to 'draw'. Artist
instances can contain instances of Artist children. When an instance
receives a draw request (may come from interactive use or a timeout)
it draws into the drawable and then passes the request on to the
children it contains.
The problem is that this introduces flicker as A draws it's
background, and then A's children draw over it.
There is, however, one Artist instance that all the drawing requests
filter through, and what I would like to do is suppress the screen
redraw until all the children are through drawing. Sometime like
screen_refresh_off()
self.draw(drawable)
for child in self.get_artists():
child.draw(drawable)
screen_refresh_on()
Where drawable is a gtk.gdk.Window. What I am currently doing is
drawing to a pixmap
self.draw(pixmap)
for child in self.get_artists():
child.draw(pixmap)
drawable.draw_drawable(gc, pixmap, 0, 0, 0, 0, self.width, self.height)
This works, and produces flicker free drawings, but I suffer a
performance hit. Since I believe pygtk2 already does double buffering
with drawing areas, I wonder if I am duplicating some effort that
might be saved with some magic tidbit of knowledge.
Thanks
John Hunter
pygtk 1.99.16
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