程序绘制二维Bezier曲线，要求用户输入控制多边形的顶点数目及其坐标，此后程序用红色显示控制多边形，用黄色显示vBezier曲线。-Procedures for drawing two-dimensional Bezier curve, control polygon require users to input the number and the vertex coordinates, since the procedures are displayed in red with the c