private boolean isAtEdge(){
		boolean isEdge=false;
		int worldX=getWorld().getWidth();
		int worldY=getWorld().getHeight();
		int thisX=getX();
		int thisY=getY();
		int thisWidth=image.getWidth()/2;
		int thisHeight=image.getHeight()/2;

		if(thisX<=0||thisY<=0||thisX+thisWidth>=worldX||thisY+thisHeight>=worldY){
			isEdge=true;
		}

		return isEdge;
	}