Using Tweens

One of the key difficulties when working with animations is in showing changes over time within a given scene. There are lots of examples:

  • You want to show a shape that starts out looking like one thing but morphs into another.
  • You want to show movement—a bicycle, car, airplane, and so on.
  • You want to illustrate a scene change: the sky changing from morning to evening, for example.
  • You want to show something spinning.

In the old days of animation, each of these changes had to be drawn frame by frame, showing subtle alterations in each to convey the sense of movement and change. What a daunting, monotonous process!

Fortunately for you, Flash uses a device called tweens to do this work for you. There are three different ...

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