Using Programming Languages other than VBA

Sub Example_LensLength()
	' This example creates a new paper space viewport.
	' It then displays the lens length of the viewport.

	Dim pviewportObj As AcadPViewport
	Dim center(0 To 2) As Double
	Dim width As Double
	Dim height As Double

	' Define the paper space viewport
	center(0) = 3: center(1) = 3: center(2) = 0
	width = 40
	height = 40

	' Change from model space to paper space
	ThisDrawing.ActiveSpace = acPaperSpace

	' Create the paper space viewport
	Set pviewportObj = ThisDrawing.PaperSpace.AddPViewport(center, width, height)
	pviewportObj.DISPLAY True
	ThisDrawing.mspace = True
	ThisDrawing.ActivePViewport = pviewportObj
	ThisDrawing.Regen acAllViewports

	' Find the Lens Length for the viewport
	Dim lenslgnth As Double
	lenslgnth = pviewportObj.LensLength
	MsgBox "The lens length of the paperspace viewport is " & pviewportObj.LensLength, , "LensLength Example"

End Sub