第二个算法不断删去多边形的凹点及新产生的凹点，最后得到凸壳顶点序列。
The second algorithm is that polygonal concave points and newly created concave points are continuously removed, and a vertex sequence of the convex hull is finally obtained.
第二个算法不断删去多边形的凹点及新产生的凹点，最后得到凸壳顶点序列。
The control points of the rational spline to be constructed were computed simply by the vertices of the given polygon.
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