public Poison(int courtWidth, int courtHeight) {
		super(INIT_VEL_X, INIT_VEL_Y, INIT_X, INIT_Y, SIZE, SIZE, courtWidth,
				courtHeight);
		try {
			if (img == null) {
				img = ImageIO.read(new File(img_file));
			}
		} catch (IOException e) {
			System.out.println("Internal Error:" + e.getMessage());
		}
	}