public void Move(){
		this.velocityX += this.deltaVelocityX;
		this.velocityY += this.deltaVelocityY;
		this.posX += this.velocityX;
		this.posY += this.velocityY;
// we've moved, so clear down the accumulated acceleration for next time
		this.deltaVelocityX=0;
		this.deltaVelocityY=0;
	}