Change the height of a movieclip from a registration point

Question

Is there a way to extend only the bottom part of a dynamic Movieclip? I tried to change the height or to scale my mc but it always makes the change relativity to the center of the Movieclip. I guess I should define a registration point and change the height according to it but i'm not sure of how to do it. Hope someone can guide me. Thanks.

annonymously annonymously · Accepted Answer · 2012-01-01T10:40:38

http://www.flashwonderland.com/transformation-matrix/transformation-matrix-2.html

You can use matrix transforms to achieve that effect.

for a scale from the top use something like this:

var scaleFromTopY:Number = 2;// change this to the correct number.
var scaleFromTopX:Number = 1;// change this as well

var topScaleMatrix:Matrix = new Matrix(
        scaleFromTopX, 0,
        0, scaleFromTopY,
        0, (mc.height*scaleFromTopY)/2 // Make this last part into -(mc.height*scaleFromTopY)/2 to scale from the bottom
);
mc.transform.matrix = topScaleMatrix;

You can also combine matrices with Matrix.concat(m:Matrix);

Change the height of a movieclip from a registration point

2 Answers