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Select Loop of Edges Example (VBA)

This example shows how to use various geometry- and topology-related methods to select a set of edges that form a closed loop around a face.



' Problem: In the SOLIDWORKS user-interface for parts and assemblies,

' you can select an option to select a set of edges that form

' a closed loop. If there is a choice of loops, an icon is

' displayed to allow choosing between the alternatives.

' In general, there is a choice if the edge is

' shared between two faces, as in an edge on a solid

' body.


' Preconditions:

' 1. Part or assembly is open.

' 2. Edge is the first selected item.

' 3. Optionally a face, adjacent to the edge

'    is the second selected item.


' Postconditions: Loop of edges on face is selected.


Option Explicit


Sub SelectLoop _

( _

    swApp As SldWorks.SldWorks, _

    swModel As SldWorks.ModelDoc2, _

    swLoop As SldWorks.Loop2, _

    swSelData As SldWorks.SelectData _


    Dim vEdgeArr                As Variant

    Dim vEdge                   As Variant

    Dim swEdge                  As SldWorks.Edge

    Dim swEnt                   As SldWorks.entity

    Dim bRet                    As Boolean


    vEdgeArr = swLoop.GetEdges

    Debug.Assert Not IsEmpty(vEdgeArr)

    For Each vEdge In vEdgeArr

        Set swEdge = vEdge

        Set swEnt = swEdge


        bRet = swEnt.Select4(True, swSelData): Debug.Assert bRet


End Sub

Sub main()

    Dim swApp                   As SldWorks.SldWorks

    Dim swModel                 As SldWorks.ModelDoc2

    Dim swSelMgr                As SldWorks.SelectionMgr

    Dim swEdge                  As SldWorks.Edge

    Dim swFace                  As SldWorks.face2

    Dim swSelData               As SldWorks.SelectData

    Dim vCoEdgeArr              As Variant

    Dim vCoEdge                 As Variant

    Dim swCoEdge                As SldWorks.CoEdge

    Dim swLoop                  As SldWorks.Loop2


    Set swApp = Application.SldWorks

    Set swModel = swApp.ActiveDoc

    Set swSelMgr = swModel.SelectionManager

    Set swEdge = swSelMgr.GetSelectedObject5(1)

    Set swSelData = swSelMgr.CreateSelectData

    Set swFace = swSelMgr.GetSelectedObject5(2)



    swModel.ClearSelection2 True


    vCoEdgeArr = swEdge.GetCoEdges

    Debug.Assert Not IsEmpty(vCoEdgeArr)


    ' 1 or 2    coedges for an edge on a surface body

    ' 2         coedges for an edge on a solid body

    Debug.Assert UBound(vCoEdgeArr) >= 0


    If 0 = UBound(vCoEdgeArr) Then

        Set swCoEdge = vCoEdgeArr(0)


        ' no ambiguity, so select

        Set swLoop = swCoEdge.GetLoop


        SelectLoop swApp, swModel, swLoop, swSelData

        Exit Sub

    End If


    ' 2 coedges, so must have face to resolve ambiguity

    Debug.Assert Not swFace Is Nothing


    For Each vCoEdge In vCoEdgeArr

        Set swCoEdge = vCoEdge


        If swEdge Is swCoEdge.GetEdge Then

            Set swLoop = swCoEdge.GetLoop


            If swFace Is swLoop.GetFace Then

                SelectLoop swApp, swModel, swLoop, swSelData

            End If

        End If


End Sub


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