System.Drawing.Graphics.FillPie C# (CSharp) Method

        public void FillPie(Brush brush, Rectangle rect, float startAngle, float sweepAngle)
        {
            if (brush == null)
                throw new ArgumentNullException ("brush");
            DrawEllipticalArc(rect, startAngle, sweepAngle, true);
            FillBrush(brush);
        }

 public void Draw(Graphics g)
 {
     if (isOpen)
     {
         g.FillEllipse(brush, X * 2 * RADIUS, Y * 2 * RADIUS, RADIUS * 2, RADIUS * 2);
     }
     else
     {
         if (Direction == DIRECTION.RIGHT)
         {
             g.FillPie(brush, X * 2 * RADIUS, Y * 2 * RADIUS, RADIUS * 2, RADIUS * 2, 45, 270);
         }
         else if (Direction == DIRECTION.LEFT)
         {
             g.FillPie(brush, X * 2 * RADIUS, Y * 2 * RADIUS, RADIUS * 2, RADIUS * 2, 225, 270);
         }
         else if (Direction == DIRECTION.UP)
         {
             g.FillPie(brush, X * 2 * RADIUS, Y * 2 * RADIUS, RADIUS * 2, RADIUS * 2, 315, 270);
         }
         else
         {
             g.FillPie(brush, X * 2 * RADIUS, Y * 2 * RADIUS, RADIUS * 2, RADIUS * 2, 135, 270);
         }
     }
 }