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Create Equation-driven Curve (VBA)

This example shows how to create and modify an equation-driven curve.

' 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.

Option Explicit

Dim swApp As SldWorks.SldWorks
Dim swModel As SldWorks.ModelDoc2
Dim swExt As SldWorks.ModelDocExtension
Dim swSelMgr As SldWorks.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()

    Set swApp = Application.SldWorks
    Set swModel = swApp.ActiveDoc
    Set swExt = swModel.Extension
    Set 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
    Set skSegment = swModel.SketchManager.CreateEquationSpline2("", "sin(x)", "", "0", "6.28", False, 0, 0, 0, True, True)


    Dim skSpline As SketchSpline
    Set 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#

    swModel.SketchManager.InsertSketch True

End Sub

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