--- On Sun, 10/24/10, Ryan May <[email protected]> wrote:
> > One solution is to add an .animation attribute to the
> > Figure class, which is None by default (for non-animated
> > drawing).
> I'm not completely wild about it, because it just feels
> wrong to put something specific to animation inside figure.
OK I see your point.
> The problem we're trying to solve here is biltting, so is
> there some way we can improve how blitting is handled?
For a general API for blitting (something that is not restricted to
animations), we need two functions: one that tells matplotlib that we want to
blit something, and one that does the actual blitting. Right now we only have
the latter. Let me point out also that there is nothing peculiar about blitting
in Quartz. It's just that in Quartz all drawing operations should be performed
from inside the event loop.
For comparison, this is roughly what happens if you draw a line:
plot(x,y)
# tells matplotlib that we want to draw a line
# this triggers a call to
draw_if_interactive()
# this marks the canvas as invalid
# the event loop then calls a callback function to redraw the canvas
# the callback function calls
figure.draw(renderer)
# which calls
renderer.draw_path
# which does the actual drawing
For a general blitting API, we need the equivalent of the plot function;
something that informs matplotlib that we want to blit but doesn't do the
actual blitting. The actual blitting should then be done from inside
figure.draw.
If you just want to implement blitting for animations, one option is to add a
draw() method to TimedAnimation, and to set fig.draw = self.draw in the
__init__.py of TimedAnimation. Then when a figure needs to be redrawn,
TimedAnimation.draw will be called from inside the event loop. Such a
TimedAnimation.draw function should then be roughly the same as the current
_draw_next_frame function.
Best,
--Michiel.
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