Re: clearing (not erasing) when drawing from a thread
Re: clearing (not erasing) when drawing from a thread
- Subject: Re: clearing (not erasing) when drawing from a thread
- From: Matt Neuburg <email@hidden>
- Date: Mon, 26 Nov 2007 07:58:21 -0800
- Thread-topic: clearing (not erasing) when drawing from a thread
On Sun, 25 Nov 2007 15:57:10 -0800, m <email@hidden> said:
> [tiffImage drawAtPoint:NSMakePoint(0, 0)
>fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1.0];
>
>The problem is that successive frames of my image get composited on
>top of each other
Possibly this has something to do with what NSCompositeSourceOver means. It
might help to experiment with other options...
> (my drawing will be placed over an arbitrary and possibly changing background)
But you are still the one drawing that background, right? So if necessary
you *could* draw it again in the area where the image is to go, right?
Just some things to think about - These are the sorts of considerations that
have led me to solutions of similar problems in the past... m.
--
matt neuburg, phd = email@hidden, <http://www.tidbits.com/matt/>
A fool + a tool + an autorelease pool = cool!
One of the 2007 MacTech Top 25: <http://tinyurl.com/2rh4pf>
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