有什么方便的工具可以算出几本形状的包络点？

[tang3w]

例如：圆形的

MakePoint(1.0,0.0,1),
MakePoint(0.62,0.08,1),
MakePoint(0.29,0.29,1),
MakePoint(0.08,0.62,1),
MakePoint(0.0,1.0,1),
MakePoint(0.08,1.38,1),
MakePoint(0.29,1.71,1),
MakePoint(0.62,1.92,1),
MakePoint(1.0,2.0,1),
MakePoint(1.38,1.92,1),
MakePoint(1.71,1.71,1),
MakePoint(1.92,1.38,1),
MakePoint(2.0,1.0,1),
MakePoint(1.92,0.62,1),
MakePoint(1.71,0.29,1),
MakePoint(1.38,0.08,1)

PS: 以上是我通过公式算的，但是稍微复杂的图形就力不从心了。

所以得求助工具