Using Programming Languages other than VBA

Sub Example_ActiveUCS()
	' This example returns the current saved UCS (or saves a new one dynamically)
	' and then sets a new UCS.
	' Finally, it returns the UCS to the previous setting.

	Dim newUCS As AcadUCS
	Dim currUCS As AcadUCS
	Dim origin(0 To 2) As Double
	Dim xAxis(0 To 2) As Double
	Dim yAxis(0 To 2) As Double

	' Get the current saved UCS of the active document. If the current UCS is
	' not saved, then add a new UCS to the UserCoordinateSystems collection
	If ThisDrawing.GetVariable("UCSNAME") = "" Then
		' Current UCS is not saved so get the data and save it
		With ThisDrawing
			Set currUCS = .UserCoordinateSystems.Add( _
							.GetVariable("UCSORG"), _
							.Utility.TranslateCoordinates(.GetVariable("UCSXDIR"), acUCS, acWorld, 0), _
							.Utility.TranslateCoordinates(.GetVariable("UCSYDIR"), acUCS, acWorld, 0), _
							"OriginalUCS")
		End With
	Else
		Set currUCS = ThisDrawing.ActiveUCS  'current UCS is saved
	End If

	MsgBox "The current UCS is " & currUCS.name, vbInformation, "ActiveUCS Example"

	' Create a UCS and make it current
	origin(0) = 0: origin(1) = 0: origin(2) = 0
	xAxis(0) = 1: xAxis(1) = 1: xAxis(2) = 0
	yAxis(0) = -1: yAxis(1) = 1: yAxis(2) = 0
	Set newUCS = ThisDrawing.UserCoordinateSystems.Add(origin, xAxis, yAxis, "TestUCS")
	ThisDrawing.ActiveUCS = newUCS
	MsgBox "The new UCS is " & newUCS.name, vbInformation, "ActiveUCS Example"

	' Reset the UCS to its previous setting
	ThisDrawing.ActiveUCS = currUCS
	MsgBox "The UCS is reset to " & currUCS.name, vbInformation, "ActiveUCS Example"
End Sub