请教提取块的中心的方法
请问各位大师:本人写了下面一个程式就是想通过框选一个块来取得块的圆心，然后在这圆心处画一个螺丝孔（其中选择的块是圆组成的），但结果不行，如果将块换成是一个圆，则可以用
selobj.center属性来取得圆心，请老手指点怎么可以取得由圆组成的块的圆心,多谢!
Public Sub c(layerr As String)
Dim ssetobj1 As AcadSelectionSet
Dim icount1 As Integer
icount1 = ThisDrawing.SelectionSets.Count
While (icount1 > 0)
If ThisDrawing.SelectionSets.Item(icount1 - 1).Name = "yuan" Then
ThisDrawing.SelectionSets.Item(icount1 - 1).Delete
End If
icount1 = icount1 - 1
Wend
Set ssetobj1 = ThisDrawing.SelectionSets.Add("yuan")
ThisDrawing.Utility.Prompt "please select object"
ssetobj1.SelectOnScreen
Dim i1 As Integer
Dim selobj1 As Acadblock
For i1 = 0 To ssetobj1.Count - 1
Set selobj1 = ssetobj1.Item(i1)
dim pt as double
dim circ as acadcircle
pt=selobj1.center
set circ = thisdrawing.modelspace.addcircle(pt,10)
Next
块里有几个圆?每个圆都要取圆心?发个块的图样上来最好
有两个不同心的圆
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