Create Equation-driven Curve (VB.NET)

'---------------------------------------------------------------
' Preconditions:  Open a part document.
'
' Postconditions:
' 1. A 2D sketch is created, and an equation spline of a
'    sine curve is created.
' 2. After the break point, the curve is edited,
'    a cosine curve is created, and the number of points in the
'    spline is reduced.
'----------------------------------------------------------------
Imports SolidWorks.Interop.sldworks
Imports SolidWorks.Interop.swconst
Imports System.Runtime.InteropServices
Imports System
Imports System.Diagnostics

Partial Class SolidWorksMacro

    Dim swModel As ModelDoc2
    Dim swExt As ModelDocExtension
    Dim swSelMgr As SelectionMgr
    Dim boolstatus As Boolean
    Dim y As String
    Dim r1 As Double
    Dim r2 As Double
    Dim rad As Boolean
    Dim ang As Double
    Dim xOff As Double, yOff As Double
    Dim LockStart As Boolean, LockEnd As Boolean

    Sub main()

        swModel = swApp.ActiveDoc
        swExt = swModel.Extension
        swSelMgr = swModel.SelectionManager

        boolstatus = swExt.SelectByID2("Front Plane", "PLANE", 0, 0, 0, False, 0, Nothing, 0)
        swModel.SketchManager.InsertSketch(True)
        swModel.ClearSelection2(True)

        Dim skSegment As SketchSegment
        skSegment = swModel.SketchManager.CreateEquationSpline2("", "sin(x)", "", "0", "6.28", False, 0, 0, 0, True, True)
        swModel.ViewZoomtofit2()

        Stop

        Dim skSpline As SketchSpline
        skSpline = skSegment
        Call skSpline.GetEquationParameters(y, r1, r2, rad, ang, xOff, yOff, LockStart, LockEnd)

        Debug.Print("y: " & y)
        Debug.Print("range start: " & r1)
        Debug.Print("range end: " & r2)
        Debug.Print("radian?: " & rad)
        Debug.Print("ang offset: " & ang)
        Debug.Print("x offset: " & xOff)
        Debug.Print("y offset: " & yOff)
        Debug.Print("lock start: " & LockStart)
        Debug.Print("lock end: " & LockEnd)

        ' Change spline to a cosine curve
        y = "cos(x)"
        Call skSpline.SetEquationParameters(y, r1, r2, rad, ang, xOff, yOff, LockStart, LockEnd)

        ' Reduce the number of points in the spline
        skSpline.Simplify(0.0#)

        swModel.SketchManager.InsertSketch(True)

    End Sub

  
    Public swApp As SldWorks


End Class