[PD] how to capture window-related mouse-events when toxy is discontinued?
matju at artengine.ca
Fri Nov 4 18:18:23 CET 2011
Le 2011-11-04 à 07:37:00, Jonathan Wilkes a écrit :
> Functionally there is no difference between altering a polygon's shape
> and the way I am moving it.
In Tk, to change the coordinates of a canvas-item, you don't have to
delete it and recreate it. There's always a canvas-method named « coords »
that takes the same number of position arguments that the item-constructor
did. So for a rectangle-item, you give two points (four numbers) and for a
N-gon (N-sided polygon), you give N points (2*N points).
It might not be much faster, though. I expect it to be only a tiny bit
faster. Just a bit less time parsing, about one less malloc and one less
free (perhaps several, because you have to remove a tag and add back the
exact same). It doesn't actually redraw anything between the delete and
Now that I think of it, the bbox computation (necessary for scheduling the
redraw) is done twice using create/delete, only once using coords, but
that should be a small amount of time compared to parsing the command.
BTW, extremely long strings of commands might be parsed repeatedly by the
client side in pd 43, because it's using [info complete] (just like
desiredata). But in practice, I didn't see it be a problem in profiling
desiredata's client's cpu usage, and I think pd 43 does it just the same.
I didn't profile in all situations, though, so, the technique might hit
problems with big arrays, big DS, big moves or abuse of [print] or of
| Mathieu BOUCHARD ----- téléphone : +1.514.383.3801 ----- Montréal, QC
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