实现多次样条曲线的C++源代码，还包括对曲线控制的功能-achieve multiple spline curve of C source code, but also to control the function curve

在三角剖分种去掉内环，需要判断点、线段、三角形与多变形的关系。这个模块提供这样的功能。-Species in the triangulation to remove the inner ring, you need to determine the point, line, triangle and polygon of relationships. This module provides this functionality.