Hide Table of Contents

Create Equation-driven Curve (VBA)

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


' Preconditions:  Part document is open in SolidWorks.


' 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

'    and a cosine curve is created.


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, 0.002, 0.002, false, false)





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

Debug.Print "-----------------------------"


'Change spline to a cosine curve

y = "cos(x)"

Call skSpline.SetEquationParameters(y, r1, r2, rad, ang, xOff, yOff, LockStart, LockEnd)


End Sub

Provide feedback on this topic

SOLIDWORKS welcomes your feedback concerning the presentation, accuracy, and thoroughness of the documentation. Use the form below to send your comments and suggestions about this topic directly to our documentation team. The documentation team cannot answer technical support questions. Click here for information about technical support.

* Required

Subject:   Feedback on Help Topics
Page:   Create Equation-driven Curve (VBA)
*   I acknowledge I have read and I hereby accept the privacy policy under which my Personal Data will be used by Dassault Systèmes

Print Topic

Select the scope of content to print:


We have detected you are using a browser version older than Internet Explorer 7. For optimized display, we suggest upgrading your browser to Internet Explorer 7 or newer.

 Never show this message again

Web Help Content Version: API Help (English only) 2012 SP05

To disable Web help from within SOLIDWORKS and use local help instead, click Help > Use SOLIDWORKS Web Help.

To report problems encountered with the Web help interface and search, contact your local support representative. To provide feedback on individual help topics, use the “Feedback on this topic” link on the individual topic page.