一条二维的贝塞尔曲线由四个点定义－两个端点和两个控制点。曲线的端点在两个端点上，控制点就好像「磁石」一样把曲线从两个端点间的直线处拉走。这一点可以由底下的bezier互动交谈程序做出最好的展示-A two-dimensional Bezier curve defined by four points- two endpoints and two control points. Curve at both endpoints on the endpoint, if the control poin