我需要vba代码来定位形状

Question

如标题中所述。我使用excel VBA在CAD中绘制了折线我需要找到折线的质心坐标我不知道正确的代码。

Sub Drawline()       
    Dim point(0 To 7) As Double 

    Dim myapp As Object 
    Dim AcadDwg As AcadDocument 
    Dim B As Double 

    On Error GoTo ERRORHANDLER 
    Set myapp = GetObject(, "autocad.application") 

ERRORHANDLER: 
    If Err.Description <> "" Then
        Err.Clear
        Set myapp = CreateObject("Autocad.Application") 
    End If

    myapp.Visible = True 
    Set AcadDwg = myapp.ActiveDocument 

    'Now Excel VBA = CAD VBA with same coding 
    Dim line As AcadLWPolyline 
    point(0) = 0: point(1) = 0 
    point(2) = 1: point(3) = 1 
    point(4) = 2: point(5) = 0 
    point(6) = 0: point(7) = 0 
    Set line = AcadDwg.ModelSpace.AddLightWeightPolyline(point)

    Dim t As AcadLayer 
    Set t = AcadDwg.Layers.Add("pline")
    line.ConstantWidth = 0.1 
    B = line.Area 
    MsgBox B      
End Sub