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Pixel Level Collision Detection

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Quark
The bigger fish follows the mouse position. In this sketch the two fish only collide when two non-transparent pixels (one from each image) appear at the same screen position. When a collision occurs the sketch draws a red box round each image. The algorithm is quite efficient because it first tests to see if the images overlap, and if they do it then compares only those pixels in the overlap area are tested.
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