A cubic Bézier curve is built from four control points. Repeated linear interpolation with the same parameter produces a point on the curve; the endpoint tangents follow the first and last edges of the control polygon.三次贝塞尔曲线由四个控制点确定。使用同一参数反复做线性插值，就得到曲线上的点；两端切线分别沿控制多边形的首边和末边。
Gold segments join first-stage interpolation points; the cyan segment joins the next pair. Its moving green point traces the final curve as runs from zero to one.金色线段连接第一轮插值点，青色线段连接下一轮的两个点。其上的绿色光点在 从零走到一时描出曲线。