Create an Animation with Shape TweeningExcerpted from Chapter 10 of Flash 4: Visual QuickStart Guide, by Katherine Ulrich
IN SHAPE TWEENING, as in motion tweening, you define the beginning and ending objects in keyframes. Flash creates the in-between frames, redrawing the object with incremental changes that transform it. The important difference between motion tweening and shape tweening is that motion tweening works on groups and symbols, where shape tweening requires editable objects.
Shape tweening doesn't restrict you to changing the object's shape. You can change any of the object's properties—size, color, location—as you would in motion tweening. While it's possible to shape-tween objects that move in straight lines, the other automated-motion features are not available. You cannot instruct Flash to rotate a shape-tweened object, for example, nor can you set shape-tweened objects to follow a motion guide.