[求助]哪位高手帮我逐行解析一下啊！谢了！

laoliu09

Dim ent As AcadEntity
Dim pnt As Variant
Dim NewCoord() As Double
Dim i As Integer
On Error Resume Next
Do
ThisDrawing.Utility.GetEntity ent, pnt, "选择多线段："
If Err Then Exit Sub
If TypeName(ent) Like "IAcad*Polyline" Then Exit Do
Loop
Dim Coord As Variant
Dim CoordCount As Integer
If TypeName(ent) = "IAcadLWPolyline" Then
Coord = ent.Coordinates
CoordCount = (UBound(Coord) + 1) / 2
ReDim NewCoord(UBound(Coord)) As Double
For i = 0 To UBound(Coord) - 1 Step 2
NewCoord(i/2) = Coord(i)
NewCoord(i/2) = Coord(i + 1)
Next i
end if 上面Newcoord()就是各顶点坐标 以上是求一个矩形四个顶点坐标的程序！哪位高手帮我逐行解析一下啊！谢了！