I'm making a game where one takes a picture of their face to use on a character. I have them zoom in on the picture, but the bitmapdata extends out of its movieclip. How do I assign bounds to my bitmapdata?
I think you need to dynamically create a shape with the x, y, width, and height of what you want to be visible, make it a mask and then add it to the display list in front of the bitmap data's movie clip. See this article on the subject.