code: public static void fillCircle(Graphics g, Point center, int diameter, Color color){
  		fillCircle(g, (int) center.x, (int) center.y, diameter, color);
  	}
docs: Draws a circle with the specified diameter using the given point as center
  and fills it with the given color.
  @param g Graphics context
  @param center Circle center
  @param diameter Circle diameter