Dim i As Integer = 0
While i < ncount
Dim p1 As Point3d = PL.GetPoint3dAt(i)
Dim p2 As Point3d = PL.GetPoint3dAt((i + 1) Mod ncount)
MsgBox(i & " " & (i + 1) Mod ncount)
i += 1
End While
Mod ncount 用的好
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