[Flash8] shape based collision detection

[tomsamson]

I had to do shape based collision detection like Grant Skinner describes here:
http://www.gskinner.com/blog/archive...8_shape_b.html

Try swf here:
http://img109.imageshack.us/my.php?image=test36cs.swf

My code here, mc with linkage name backmc is the background, mc back2 is the moving one and there is mc mouse inside back2 which will be dragged:

import flash.display.BitmapData;
import flash.geom.ColorTransform;
import flash.geom.Matrix;
import flash.geom.Rectangle;
this.attachMovie ("backmc", "backmc", 1);
this.attachMovie ("back2", "backmc2", 2);
backmc2.mouse.startDrag (true);
this.onEnterFrame = function () {
	var myMatrix:Matrix = new Matrix ();
	var myCT:ColorTransform = new ColorTransform (0, 0, 0, 1, 0, 255, 255, 0);
	var myBmp:BitmapData = new BitmapData (400, 250, false);
	myBmp.draw (backmc, myMatrix, myCT, "normal");
	myCT = new ColorTransform (0, 0, 0, 1, 255, 255, 255, 0);
	myBmp.draw (backmc2, myMatrix, myCT, "difference");
	var cB:Rectangle = myBmp.getColorBoundsRect (0x00FFFFFF, 0x00FF0000, true);
	var collision:Boolean = true;
	if (cB.width == 0 and cB.height == 0) {
		collision = false;
	}
	_root.collision=collision;
};

/*originally posted by tonypa,moved to its own thread by tomsamson*/