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Using Animated Masks

In Chapter 5, you learned about Flash’s capability to create mask layers that hide and reveal objects on lower layers. Sometimes, the best way to create the illusion of movement is to animate a mask so that it gradually hides or reveals objects.

Imagine a line that starts at the left edge of the Stage and goes all the way to the right edge. If you create a mask that reveals the line bit by bit, you create the illusion of a line that draws itself. Reverse the process, and you have a line that gradually erases itself.


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