Watermark effect

import	com.hangunsworld.as3.util.BMPFunctions;
 
var wm:BitmapData = new WatermarkSource(0, 0);
 
var bd:BitmapData = new BitmapData(mc.width, mc.height, true, 0×00);
bd.draw(mc);
 
var bmp:Bitmap = new Bitmap(bd);
bmp.x = mc.width + 5;
addChild(bmp);
 
add_btn.addEventListener(MouseEvent.CLICK, btnClick);
function btnClick(evt:MouseEvent):void{
	var mar:uint = uint(margin_txt.text);
	var off:uint = uint(offset_txt.text);
	var sca:Number = uint(scale_txt.text);
	var rot:uint = uint(rotation_txt.text);
	rot = rot%360;
	rotation_txt.text = rot.toString();
	var alp:Number = uint(alpha_txt.text);
	alp = Math.min(alp, 100);
	alpha_txt.text = alp.toString();
 
	sca /= 100;
	alp /= 100;
 
	bd.draw(mc);
	bd = BMPFunctions.addWatermark(bd, wm, mar, off, sca, rot, alp);
}