Use mouse to create N points as the contorl polygon of your curve. Using the following parameters to generate your desired curve.

α: L:
Curve order of smoothness: 2 3 4 α-b-spline curve: Show Hide
Close or open curve: Open Close Standard b-spline curve: Show Hide
Contorl polygon: Show Hide
Standard b-spline interpolation curve: Show Hide

Your browser does not support the canvas element.