;
				dx = this.position.x - oldx;
				dy = this.position.y - oldy;
				dx = dx > 5 ? 5 : (dx < -5 ? -5 : dx);
				dy = dy > 10 ?10 :(dy < -10 ? -10 : dy) - 3;
				this.velocity={
					x : dx,
					y : dy
				};
				
				for(n = 0; n < this.numpoints; n++){
					this.points[n].x *= shrinkRate;
					this.points[n].y *= shrinkRate;
				}
			}
			for(n = 0; n < this.numpoints; n++){
				var newx = this.cosine * this.points[n].x - this.sine * this.points[n].y;
				this.points[n].y = this.sine * this.points[n].x