public Dot(String color,int theX,int theY, int theRadius) {
		if(!(Arrays.asList(LEGAL_COLOR_NAMES).contains(color))){
			String err = "Not a valid color";
			IllegalArgumentException x = new IllegalArgumentException(err);
			throw x;
		}
		this.color_name = color;
		this.x = theX;
		this.y = theY;
		this.radius = theRadius;

	}