Using Programming Languages other than VBA

Sub Example_AngleFromXAxis()
	' This example finds the angle, in radians, between the X axis
	' and a line defined by two points.

	Dim pt1(0 To 2) As Double
	Dim pt2(0 To 2) As Double
	Dim retAngle As Double

	pt1(0) = 2: pt1(1) = 5: pt1(2) = 0
	pt2(0) = 5: pt2(1) = 2: pt2(2) = 0

	' Return the angle
	retAngle = ThisDrawing.Utility.AngleFromXAxis(pt1, pt2)

	' Create the line for a visual reference
	Dim lineObj As AcadLine
	Set lineObj = ThisDrawing.ModelSpace.AddLine(pt1, pt2)
	ZoomAll

	' Display the angle found
	MsgBox "The angle in radians between the X axis and the line is " & retAngle, , "AngleFromXAxis Example"

End Sub