topic converting 2dpolyline to regular polyline in .NET Forum

converting 2dpolyline to regular polyline

Anonymous — Wed, 13 Feb 2013 20:56:21 GMT

Although I have found code that should allow me to convert 2dpolylines to regular polylines, I am having troubles implementing it. At first I got the eInvalid Input but have since fixed that. However, the error now is that there is no error. Autocad just seems to lock up but I can still switch to visual studio and look at my code. It as though Autocad thinks it is doing something but my code is not doing anything. I can scroll around.

My code is this:

        Try
            Dim acDrawing As Document = Application.DocumentManager.MdiActiveDocument
            Using acDrawingLock As DocumentLock = acDrawing.LockDocument
                Using acTransaction As Transaction = acDrawing.Database.TransactionManager.StartTransaction
                    Dim acBlockTable As BlockTable = acTransaction.GetObject(acDrawing.Database.BlockTableId, OpenMode.ForWrite)
                    Dim acBlockTableRecord As BlockTableRecord = acTransaction.GetObject(acBlockTable("*MODEL_SPACE"), OpenMode.ForWrite)
                    For Each Id As ObjectId In acBlockTableRecord
                        If Id.ObjectClass.Name = "AcDb2dPolyline" Then
                            Dim acPolyline2d As Polyline2d = Id.GetObject(OpenMode.ForWrite, True)
                            Dim acPolyLine As New Polyline()
                            acPolyLine.ConvertFrom(acPolyline2d, True)
                        End If
                    Next
                    acTransaction.Commit()
                End Using
            End Using
        Catch ex As System.Exception
            MsgBox(ex.ToString)
        End Try

Anyone have any ideas? It appears to hang on the acpolyline.convertofrm(acpolyline2d, true) line.

Thanks a bunch,

Re: converting 2dpolyline to regular polyline

Alexander.Rivilis — Wed, 13 Feb 2013 21:51:14 GMT

As I know one of the problems - using transactions.

Try samples and explanation:

Converting a Polyline2d to Polyline

Converting a Polyline to Polyline2d

Also Polyline2d have to be simple (SimplePoly) or fit (FitCurvePoly) and has not any Xdata attached to vertexes.

Re : converting 2dpolyline to regular polyline

_gile — Wed, 13 Feb 2013 22:03:45 GMT

Hi,

You have to add the newly created polyline to the Database (and erase the polyline 2d).

Here's a quick and dirty C# snippet:

            Document doc = AcAp.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;
            using (doc.LockDocument())
            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                BlockTableRecord mSpace =
                    (BlockTableRecord)SymbolUtilityServices
                    .GetBlockModelSpaceId(db)
                    .GetObject(OpenMode.ForWrite);
                RXClass rxc = RXClass.GetClass(typeof(Polyline2d));
                foreach (ObjectId id in mSpace)
                {
                    if (id.ObjectClass == rxc)
                    {
                        Polyline2d pl2d = (Polyline2d)tr.GetObject(id, OpenMode.ForWrite);
                        if (pl2d.PolyType != Poly2dType.CubicSplinePoly &&
                            pl2d.PolyType != Poly2dType.QuadSplinePoly)
                            using (Polyline pline = new Polyline())
                            {
                                pline.ConvertFrom(pl2d, false);
                                mSpace.AppendEntity(pline);
                                tr.AddNewlyCreatedDBObject(pline, true);
                                pl2d.Erase();
                            }
                    }
                }
                tr.Commit();
            }

Re : converting 2dpolyline to regular polyline

Alexander.Rivilis — Wed, 13 Feb 2013 22:16:06 GMT

Hi, Gilles!

Are you sure that Transaction can be using in that context?

Re: converting 2dpolyline to regular polyline

Anonymous — Wed, 13 Feb 2013 22:24:49 GMT

I tried the code from that link, but I was having troubles getting it to work. It could have something to do with me translating to VB.net. Perhaps my translation was messed up. Do you have a quick translation?

Re : converting 2dpolyline to regular polyline

Anonymous — Wed, 13 Feb 2013 22:26:32 GMT

Thanks Gile,

I had come across that code at one point in my travels, but didnt think it did what I wanted it to do. I will try that next.

Thanks,

Re : converting 2dpolyline to regular polyline

Alexander.Rivilis — Wed, 13 Feb 2013 22:39:52 GMT

' Translated C#->VB.NET code:
' http://adndevblog.typepad.com/autocad/2012/05/converting-a-polyline2d-to-polyline.html
<CommandMethod("TestConvertPoly")> _
Public Sub testConvertPoly()
    Dim doc As Document = Application.DocumentManager.MdiActiveDocument
    Dim db As Database = doc.Database
    Dim ed As Editor = doc.Editor
    ' select the entity
    Dim res As PromptEntityResult = ed.GetEntity("Select PolyLine: ")
    ' if ok
    If res.Status = PromptStatus.OK Then

        ' use the using keyword so that the objects auto-dispose

        '(close)  at the end of the brace

        ' open for write otherwise ConvertFrom will fail


        Using ent As Entity = DirectCast(res.ObjectId.Open(OpenMode.ForRead), Entity)

            ' if it's a polyline2d

            If TypeOf ent Is Polyline2d Then


                Dim poly2d As Polyline2d = DirectCast(ent, Polyline2d)

                poly2d.UpgradeOpen()


                ' again use the using keyword to ensure auto-closing


                Using poly As New Autodesk.AutoCAD.DatabaseServices.Polyline()

                    poly.ConvertFrom(poly2d, True)

                End Using

            End If

        End Using
    End If

End Sub

Re : converting 2dpolyline to regular polyline

Anonymous — Thu, 14 Feb 2013 01:49:44 GMT

Thanks Alexander and everyone who has help so far.

The vb.net code actually worked. I think what happened to me preivously when attempting to use that code is that I saw a message about the Open function being obsolete to use GetObject instead. So I did, but that didnt work. When I actually used the Open the way you have it in your example code and ignored that little message, everything worked beautifully.

Thanks for your help. I greatly appreciate it!