I'm working on a program that has a window with a background picture.
Most of the action takes place in a large canvas that I do a lot of
drawing into as a result of user actions, such as clicking and
dragging in that canvas. As it's getting more complex the
responsiveness is substantially reduced. If I clicked on something,
which will cause my program to draw it differently (so it appears
selected) it takes several seconds to happen. After some
investigation I realize that in response to that click I am getting a
big pile of calls to the canvas' paint method.
It's as if the OS doesn't believe I've "satisfied" the paint request.
If I put code in there that does nothing except let me know it's been
called, then the calls never stop.
Am I doing something that's obviously wrong? If I remove the
background picture the calls are *substantially* reduced, for what
it's worth. I tried drawing the background image myself, but that
only made things worse, as the window.paint method was called
continuously.
Thanks for any insights,
-Steve
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