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 control polygon, use the yellow curve shows vBezier.