[flexcoders] How do I rotate a transparent png & maintain transparency?

[ivo]

Hello all,

I have an image and I want to flip it horizontally. The source image is a png 
with a transparent background and I find that the flipped image losses the 
transparency. How do I preserve it?

I am using the code below:

//flip horizontally
var transform:Matrix = new Matrix();
transform.scale(-1, 1);
transform.translate(sourceImage.width, 0);

//create a new bitmap based on source with transformation
var _newBitmap:BitmapData = new BitmapData(sourceImage.width, 
sourceImage.height, true);
_newBitmap.draw(sourceImage, transform);
            
var displaySprite:Sprite = new Sprite();
displaySprite.graphics.beginBitmapFill(_newBitmap, null, false);
displaySprite.graphics.drawRect(0, 0, sourceImage.width, sourceImage.height);

Thanks,

- Ivo