How can I capture the area of the iPhone/iPad screen being touched?

Posted by BeachRunnerJoe on Stack Overflow See other posts from Stack Overflow or by BeachRunnerJoe
Published on 2010-06-12T21:13:12Z Indexed on 2010/06/12 21:23 UTC
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iphone

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ipad

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opengl-es

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core-graphics

Is there a way to capture the exact collection of pixels/points on the screen that are currently making contact with the users? I assume there is since this finger painting app shows the ipad responding to only the pixels that the user makes contact with.

Thanks so much in advance for your help!

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