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Re: drawRect troubles

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Re: drawRect troubles

Subject: Re: drawRect troubles
From: Scott Stevenson <email@hidden>
Date: Sat, 28 Oct 2006 20:11:31 -0700


On Oct 28, 2006, at 8:05 PM, Ivan Kourtev wrote:

For performance reasons I am trying to do incremental drawing -- draw/erase only small amounts of stuff that has changed -- but it seems that the view contents is "erased" between successive calls to drawRect. After each drawRect, I only see the incremental drawing -- the small stuff added/removed -- but not what was there before.


Have you tried playing with Quartz Debug's "flash updates" checkbox?

Should show you which areas are considered invalid at which points. Might help.

    - Scott
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