Change Pitch of Helix (VB.NET)

This example shows how to change the pitch of a helix.

'-------------------------------------------------------
' Preconditions:
' 1. Model containing a helix feature is open.
' 2. Helix feature is selected.
' 3. Open the Immediate window.
' 4. Run the macro.
'
' Postconditions:
' 1. Pitch of selected helix feature is modified.
' 2. Name of helix feature, original pitch, and
'    modified pitch values are printed to the Immediate window.
'--------------------------------------------------------
Imports SolidWorks.Interop.sldworks
Imports SolidWorks.Interop.swconst
Imports System
Imports System.Diagnostics

Partial Class SolidWorksMacro

    Public Sub Main()

        Dim swModel As ModelDoc2
        Dim swSelMgr As SelectionMgr
        Dim swFeat As Feature
        Dim swHelix As HelixFeatureData
        Dim bRet As Boolean

        swModel = swApp.ActiveDoc
        swSelMgr = swModel.SelectionManager
        swFeat = swSelMgr.GetSelectedObject6(1, -1)
        swHelix = swFeat.GetDefinition

        Debug.Print("Feature = " & swFeat.Name)
        Debug.Print("  Original pitch = " & swHelix.Pitch * 1000.0# & " mm")

        ' Change the pitch value
        swHelix.Pitch = 1.25 * swHelix.Pitch
        Debug.Print("  Modified pitch = " & swHelix.Pitch * 1000.0# & " mm")

        ' Apply the change
        bRet = swFeat.ModifyDefinition(swHelix, swModel, Nothing) : Debug.Assert(bRet)

    End Sub

    ''' <summary>
    ''' The SldWorks swApp variable is pre-assigned for you.
    ''' </summary>
    Public swApp As SldWorks


End Class