How do you ignore the palm while drawing multi-touch?

Question

Several multi-touch drawing applications have features that prevent interference when the user presses a palm on the screen while drawing.

How do they filter out touch events from the palm of their hand, but allow you to correctly enter your finger or stylus?

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iphone multi-touch

idrish Nov 29 '10 at 9:48

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2 answers

Greg · Answer 1 · 2010-11-29T09:51:14+0000

Ignore any inputs with a few touches that are close to each other, only accepting data from one point (finger).

Michael kernahan · Answer 2 · 2011-05-02T16:36:29+0000

Take the top y-component from the touch group.