This option allows the user to create a parabola. The parameters to this function are directrix center point of the parabola, focus point and corner point. The directrix point determines the axis of symmetry of the parabola. The focus of a parabola is a fixed point on the interior of a parabola used in the formal definition of the curve . The end point determines the length and curvature of the parabola.

Figure 1. Drawing a parabola.