How to cut a "hole" inside a rectangular Sprite to see the Sprite underneath? (ActionScript 3)

Posted by Zando on Stack Overflow See other posts from Stack Overflow or by Zando
Published on 2010-02-03T22:27:56Z Indexed on 2010/03/31 15:03 UTC
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actionscript-3

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mask

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masking

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drawing

Everytime I google this question I see confusing information about masks and blends, none of which seems to directly apply to what I think should be an easy thing...

There are three Sprites involved here...the lowest layer sprite is pretty much a background. I want to overlay a translucent Sprite on top of the background and then I want the third, top-most Sprite to act as a hole, so that the area inside the third Sprite is completely transparent, so that the background sprite is completely visible.

How would I go about doing this dynamically (i.e. dynamically drawing the masking sprite and hole using the Actionscript graphics calls)?

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