.net - Sorting selected elements (autocad) -

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please me out here. i'm trying change order of selection (which exists out of elements: lines, polylines , arcs). elements of selection attached 1 another. code needs create new list in elements sorted ending entity other ending entity.

my code:

    public sub reorder()     dim document document = autodesk.autocad.applicationservices.application.documentmanager.mdiactivedocument     dim ed editor = document.editor     dim db database = document.database      dim fillist typedvalue() = new typedvalue(0) {new typedvalue(cint(dxfcode.start), "lwpolyline,arc,line")}     dim filter new selectionfilter(fillist)     dim opts new promptselectionoptions()      try         opts.messageforadding = ("select items: ")         dim res promptselectionresult = ed.getselection(opts, filter)         if res.status <> promptstatus.ok             exit sub         end if          dim selset selectionset = res.value         dim idarray objectid() = selset.getobjectids()          using document.lockdocument             using trans transaction = db.transactionmanager.starttransaction()                 dim btr blocktablerecord = trycast(trans.getobject(db.currentspaceid, openmode.forwrite), blocktablerecord)                  dim lstent new list(of entity)                 each id objectid in idarray                     dim ent1 entity = directcast(trans.getobject(id, openmode.forread), entity)                     lstent.add(ent1)                 next                  dim tolerance_xy double = 0.01                 dim lstelementensorted new list(of curve)                 dim blnreverse boolean = false                 lstelementensorted.add(lstent(0))                  p integer = 0 lstent.count - 1                     dim element1 curve = lstent(p)                      q integer = 0 lstent.count - 1                         dim element2 curve = lstent(q)                         if not element1 element2                             dim deltax double                             dim deltay double                              deltax = math.abs(element1.endpoint.x - element2.startpoint.x)                             deltay = math.abs(element1.endpoint.y - element2.startpoint.y)                             if deltax < tolerance_xy andalso deltay < tolerance_xy                                 if not lstelementensorted.contains(element2)                                     if blnreverse                                         lstelementensorted.insert(0, element2)                                     else                                         lstelementensorted.add(element2)                                     end if                                 end if                                 continue                             end if                              deltax = math.abs(element1.endpoint.x - element2.endpoint.x)                             deltay = math.abs(element1.endpoint.y - element2.endpoint.y)                             if deltax < tolerance_xy andalso deltay < tolerance_xy                                 if not lstelementensorted.contains(element2)                                     blnreverse = iif(blnreverse = true, false, true)                                     if blnreverse                                         lstelementensorted.insert(0, element2)                                     else                                         lstelementensorted.add(element2)                                     end if                                 end if                                 continue                             end if                              deltax = math.abs(element1.startpoint.x - element2.endpoint.x)                             deltay = math.abs(element1.startpoint.y - element2.endpoint.y)                             if deltax < tolerance_xy andalso deltay < tolerance_xy                                 if not lstelementensorted.contains(element2)                                     if blnreverse                                         lstelementensorted.add(element2)                                     else                                         lstelementensorted.insert(0, element2)                                     end if                                 end if                                 continue                             end if                              deltax = math.abs(element1.startpoint.x - element2.startpoint.x)                             deltay = math.abs(element1.startpoint.y - element2.startpoint.y)                             if deltax < tolerance_xy andalso deltay < tolerance_xy                                 if not lstelementensorted.contains(element2)                                     blnreverse = iif(blnreverse = true, false, true)                                     if blnreverse                                         lstelementensorted.add(element2)                                     else                                         lstelementensorted.insert(0, element2)                                     end if                                 end if                                 continue                             end if                         end if                     next                 next                  r integer = 0 lstelementensorted.count - 1                     ed.writemessage(lstelementensorted.item(r).gettype.name.tostring & " - ")                 next                 trans.commit()              end using         end using     catch ex system.exception         ed.writemessage(ex.message)     end try end sub

i can't figure out how should add elements list in correct order. in advance!


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