Flash upload image resize client side

Question

Does anyone got an ideia on how to get client side image resize using flash.

Example: Client chooses an image with 1200x800 and before it uploads it flash will turn

Answer 1

You need create a transformation matrix, then draw the original bitmap into a new one using it. Here's the idea in something i am just typing in and have not tested:

function resize(obm:BitmapData, scale:Number): BitmapData {
   var resizeMatrix:Matrix = new Matrix();
   resizeMatrix.scale(scale, scale);

   var rbm:BitmapData = new BitmapData(obm.width * scale, obm.height * scale);
   rbm.draw(obm, resizeMatrix);

   return rbm;
}

I make no claims about the quality of the result, however. I think I remember trying this in the past, not liking the result, and punting...