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Chapter 1. Building Complexity > Shape Tweening Strategies

Shape Tweening Strategies

Shape tweening is a technique for interpolating amorphous changes that can't be accomplished using instance transformations such as rotation, scale, or skew. Fill, outline, gradient, and alpha are all shape attributes that can be shape tweened.

Flash applies a shape tween using what it considers the most efficient, direct route. This method sometimes has unpredictable results, creating overlapping shapes or seemingly random holes that appear and merge (Figure 1.31). These undesirable effects are usually the result of keyframes containing shapes that are too complex to tween all at once. As with motion tweening, simplifying a complicated shape tween into more basic component parts and separating those parts in layers will result in a more successful interpolation. Shape hints give you a way to tell Flash what point on the first shape corresponds to what point on the second shape. Sometimes, adding intermediate keyframes will help a complicated tween by providing a transition state and making the tween go through many but more manageable stages.


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