ScrambledPhysics is a simple physics engine written in 100% native Processing. The aim of the project is to create a portable (within Processing) library which is good enough for basic physics simulations.

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The example above should give you an idea of what it can do. This is simulating 100 charged particles (some positive, some negative), with an initial velocity of zero and a random placement within the universe, which is 640 x 480 pixels in size. When a particle reaches the edge, it wraps around.