C.a.R. > Applications > Curves > Bezier Curve
Bezier curve with four control points. The curve is computed with the de Casteljeau algorithm. This algorithm parts the control segments in the same ratio and connects those points. Then it continues with the new segments. Move the point on top to see how it works. You can also move the control points.
For the partitions, we use a macro, of course. The curve is a track.