用于多个离散点拟合光滑曲线的，优化了追赶法，这个例子适用于闭合和不闭合两种情况。当时由于工程情况，写的急，代码不好看，但是很好用。为了方便传递参数，我做了一个链表，用时候根据自己情况可以修改，核心算法不动即可。-point for a number of discrete smooth curve fitting, and optimized to catch up with the law applicable to this case is not closed and the closur