三次样条插值，需要三次样条插值的可以下载这个包，也许对你有帮助-cubic spline curve

Bspline曲线生成程序Catmull-Rom Spline, Lagrange, Natural Cubic Spline, and NURBS方法获得B样条曲线-Implementation of various mathematical curves that define themselves over a set of control points. The API is written in Java. The curves supported are: Bezier, B-Spl

BSpline 及各种曲线Implementation of various mathematical curves that define themselves over a set of control points. The API is written in Java. The curves supported are: Bezier, B-Spline, Cardinal Spline, Catmull-Rom Spline, Lagrange, Natural Cubic Splin