Using Programming Languages other than VBA

Sub Example_Thickness()
	' This example creates a circle in model space
	' and changes the thickness of the circle.
   
	Dim circleObj As AcadCircle
	Dim centerPoint(0 To 2) As Double
	Dim radius As Double

	' Define the circle
	centerPoint(0) = 0#: centerPoint(1) = 0#: centerPoint(2) = 0#
	radius = 5#

	' Create the Circle object in model space
	Set circleObj = ThisDrawing.ModelSpace.AddCircle(centerPoint, radius)
	ZoomAll

	' Find the current thickness of the circle
	Dim currThickness As Double
	currThickness = circleObj.Thickness
	MsgBox "The thickness of the circle is " & circleObj.Thickness, vbInformation, "Thickness Example"

	' Change the thickness of the circle
	circleObj.Thickness = currThickness + 3
	circleObj.Update

	' Change the direction of the viewport so that you can
	' view the change made to the thickness. Once you change
	' the direction, you must reset the active viewport.
	Dim NewDirection(0 To 2) As Double
	NewDirection(0) = -1: NewDirection(1) = -1: NewDirection(2) = 1
	ThisDrawing.ActiveViewport.direction = NewDirection
	ThisDrawing.ActiveViewport = ThisDrawing.ActiveViewport
	MsgBox "The thickness of the circle is now " & circleObj.Thickness, vbInformation, "Thickness Example"

End Sub