BitmapData.hitTest:
http://livedocs.adobe.com/flash/9.0/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00001410.html


  Leandro Ferreira


On Mon, Jun 22, 2009 at 19:21, Andrew Sinning <and...@learningware.com>wrote:

> If I draw a circle using the Graphics and Shape classes, and then add the
> shape to a sprite, I can use the sprite for the hitArea of another sprite
> and it works just fine.  Everything within the circle is a hit, everything
> outside of it is a miss.
>
> However, if I create a sprite containing a Bitmap drawn from this same
> circle and try to use this sprite for the hitArea, the entire rectangle
> becomes the hit area.  I've played around with different alpha-levels, using
> white and black, and using the opaqueBackground setting.  Nothing seems to
> work.  Am i missing  something or is this a known limitation?
>
> I'm using AS3 under Flash CS3.
>
> Thanks!
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