怎样在已知 多段线的 起点 端点 及 凸度条件下 求 圆心坐标？
如题，怎样在已知 多段线的 起点 端点 及 凸度条件下求 圆心坐标？请各位多帮助！谢谢！！ 这还不简单吗，就三角函数加平面几何 我是初学，起点到终点画一条直线，再画该直线的中垂线，最后求出中垂线和多线段的交点，两个交点的中点就是圆心坐标。
Public Const PI As Double = 3.1415926
Public Sub demoACR()
Dim ptBase As Variant
Dim objEntity As AcadLWPolyline
Dim PT1(2) As Double '起点
Dim PT2(2) As Double '终点
Dim PT12(2) As Double '中心点
Dim LINE12 As AcadLine 'pt1,pt2画直线
Dim LineZ As AcadLine 'line12的中垂线
ThisDrawing.Utility.GetEntity objEntity, ptBase, "请选择图元:"
PT1(0) = objEntity.Coordinates(0): PT1(1) = objEntity.Coordinates(1): PT1(2) = 0
PT2(0) = objEntity.Coordinates(2): PT2(1) = objEntity.Coordinates(3): PT2(2) = 0
PT12(0) = (PT1(0) + PT2(0)) / 2: PT12(1) = (PT1(1) + PT2(1)) / 2: PT12(2) = 0
Set LINE12 = ThisDrawing.ModelSpace.AddLine(PT1, PT2)
Dim angleZ As Double
angleZ = LINE12.angle + PI / 2
Set LineZ = AddLineReAL(PT12, angleZ, 100)
Dim pt3 As Variant
pt3 = LineZ.IntersectWith(objEntity, acExtendBoth)
Dim PtCen(2) As Double
PtCen(0) = (pt3(0) + pt3(3)) / 2: PtCen(1) = (pt3(1) + pt3(4)) / 2: PtCen(2) = (pt3(2) + pt3(5)) / 2
Stop
End Sub
'根据起点和相对极坐标创建直线
Public Function AddLineReAL(ByVal ptSt As Variant, ByVal angle As Double, ByVal dist As Double) As AcadLine
Dim ptEn(2) As Double
ptEn(0) = ptSt(0) + dist * Cos(angle)
ptEn(1) = ptSt(1) + dist * Sin(angle)
ptEn(2) = ptSt(2)
Set AddLineReAL = ThisDrawing.ModelSpace.AddLine(ptSt, ptEn)
End Function
http://bbs.mjtd.com/forum.php?mod=redirect&goto=findpost&ptid=111783&pid=656515&fromuid=332660 感谢各位大侠的恢复，给的思路 解决了！！谢谢！
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