Код AS3:

var greenBallCoords:Point = new Point(greenBall.x, greenBall.y);
var r:Point = new Point();
 
var v:Point = new Point();
var speed:Number = 5;
 
function update(e:Event = null)
{
	r.x = blueBall.x;
	r.y = blueBall.y;
	r = r.subtract(greenBallCoords);	
	v.x = r.y;
	v.y = -r.x;
	v.normalize(speed);
 
	blueBall.x += v.x;
	blueBall.y += v.y;