一个完整的bezier曲线程序。在单文档上用鼠标随便点一些点，将这些点作为控制顶点，根据bezier曲线原理生成一条光滑的曲线。-A complete program of the bezier curve. Casually point some of the points in a single document with the mouse, these points as control vertices to generate a smooth curve based on the p