Hi-Motor Barrier End Playground is for designers and developers exploring
the potential of B-Spline in motor barrier design.
Each segment is defined by its two endpoints and two control points.
A control point determines the tangent at the corresponding endpoint.
You can drag the endpoints and the control points (fixed on the axis by default).
If "Lock Control Point Pairs" is specified, then the two control points
associated with the endpoint where two segments join are constrained to
move together, resulting in a smooth curve.
If "Lock Control Point Pairs" is specified,then you can drag the control
freely.