Public Function getBoundingBox(ByVal dxfFile As String, ByVal rotAngle As _
  Double, _
                                   ByRef x1 As Double, ByRef y1 As Double, _
                                   ByRef x2 As Double, ByRef y2 As Double, _
                                   ByRef x3 As Double, ByRef y3 As Double, _
                                   ByRef x4 As Double, ByRef y4 As Double) As _
                                   Integer
End Function