Start off with a new Flash file, and set your scene by drawing something or importing an image to use as the background (I’m lazy, so I import old artwork from previous experiments with comic pages). On a layer above the layer that will be concealed/revealed by the mask, draw the shape that will delineate the revealed area.
Motion Tweening a Mask
From Adrien-Luc Sanders, former About.com Guide
In this lesson, we’re going to learn how to animate a mask using a motion tween to change the position of the mask, thus changing the area revealed. If you’re not familiar with masking and what it accomplishes, click the link on the word “mask” to follow the initial lesson on masking.
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