closed_cubic_bsplin​e(P, varargin)

This is a function to draw a closed cubic B-Spline.

This is a function to draw a closed cubic B-Spline, based on <Curves and Surfaces for Computer Graphics(2006)> by David Salomon (great book!), page 261 (closed cubic B-Spline curve).
usage:
closed_cubic_bspline(P,1) will compute and plot the closed B-Spline.
closed_cubic_bspline(P) will only compute the interpolated points.
notes:
In my program, I used a step of 1/100; if you need higher density, you could modify the value of nj (set to 100) on line 35.