VB编程改变AutoCAD圆对象的圆形坐标和半径

通过设置圆和圆弧实体的Center、Radius属性，可以改变其圆心坐标和半径值，通过返回其属性值，可以获取其圆心坐标和半径值。

下面的代码将模型空间的所有圆向上移动100的单位，并将半径减为原来的一半。

Private Sub Command1_Click()
    Dim i As Integer
    Dim currcenterpt As Variant
    Dim newcenterpt(0 To 2) As Double
    Dim rad As Double
    For i = 0 To acadapp.ActiveDocument.ModelSpace.Count - 1
        If acadapp.ActiveDocument.ModelSpace(i).EntityType = acCircle Then
            currcenterpt = acadapp.ActiveDocument.ModelSpace(i).center
            rad = acadapp.ActiveDocument.ModelSpace(i).radius
            newcenterpt(0) = currcenterpt(0)
            newcenterpt(1) = currcenterpt(1) + 100
            newcenterpt(2) = currcenterpt(2)
            rad = rad / 2
            acadapp.ActiveDocument.ModelSpace(i).center = newcenterpt
            acadapp.ActiveDocument.ModelSpace(i).radius = rad
            acadapp.ActiveDocument.ModelSpace(i).Update
        End If
    Next i
End Sub