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Masks

Learn Masks in ActionScript 3 with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.

12 min read • Intermediate

Masks is an atomic ActionScript 3 topic inside Display List. The example below uses the actual construct named by the lesson rather than a generic placeholder.

Focus on what Masks changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.

Topic-specific example

actionscript-06-10-masks.as
actionscript Try It Live
var maskShape:Shape=new Shape(); maskShape.graphics.beginFill(0); maskShape.graphics.drawCircle(50,50,40); addChild(maskShape); sprite.mask=maskShape;
Edge case / engineering note

Change the key input in this ActionScript 3 example and predict the result first; the named construct should be the reason the behavior changes.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

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