Sketcher CreateArcOfParabola

Description
This tool creates an arc of parabola by focus, vertex and endpoints.



How to use

 * 1) Press the  button.
 * 2) Click in the 3D view to define the focus point (labelled 1 in the picture above).
 * 3) Click in the 3D view to define the tip of the arc of hyperbola (labelled 2 in the picture above).
 * 4) Click in the 3D view to define the first end point (labelled 3 in the picture above).
 * 5) Click a fourth time in the 3D view to define the other end point (labelled 4 in the picture above).