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Book Overview & Buying
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Mastering AndEngine Game Development
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The most basic form of frame-based animation is just like a celluloid film—a series of images shown sequentially at a fixed rate. If the animation speed is picked properly (roughly 10 frames per second), the effect is that of fluid motion, with one frame's content transitioning into the next frame's content. The technical name for this is the Phi phenomenon; due to persistence of vision, the gaps between frames are not consciously perceived, and thus they are filled in by the brain.
Key frame animation is different from this in that it doesn't define every part of the animation, but merely specifies the start and end frames, along with information on how to get from the A frame to the B frame. This could involve something as basic as a shape in key frame A moved by a certain distance in key frame B. The animation would then involve interpolating this movement using a certain number of frames over a specific time period. This is called inbetweening...
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