topic Re: Leader arrowhead is not created in .NET Forum

Leader arrowhead is not created

Anonymous — Tue, 07 May 2013 15:17:15 GMT

Hi All,

I have tried to create a leader with simple code like below. After invoking the command, Leader line is there but I can not see the arrowhead. Can any body help me in this regard that why arrowhead is not created?

Imports Autodesk.AutoCAD.ApplicationServices

Imports Autodesk.AutoCAD.Runtime

Imports Autodesk.AutoCAD.DatabaseServices

Imports Autodesk.AutoCAD.EditorInput

Imports Autodesk.AutoCAD.Geometry

<CommandMethod("CreateLeader")> _

PublicSubCreateleader()

Dim acDoc AsDocument = Application.DocumentManager.MdiActiveDocument

Dim acCurDb AsDatabase= acDoc.Database

Using acTrans AsTransaction= acCurDb.TransactionManager.StartTransaction()

Dim acBlkTbl AsBlockTable

acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead)

Dim acBlkTblRec AsBlockTableRecord

acBlkTblRec = acTrans.GetObject(acBlkTbl(

BlockTableRecord.ModelSpace), OpenMode.ForWrite)

Dim acLdr AsLeader = NewLeader()

acLdr.AppendVertex(NewPoint3d(2, 2, 0))

acLdr.AppendVertex(NewPoint3d(4, 4, 0))

acLdr.AppendVertex(NewPoint3d(4, 5, 0))

acLdr.HasArrowHead = True

acBlkTblRec.AppendEntity(acLdr)

acTrans.AddNewlyCreatedDBObject(acLdr, True)

acTrans.Commit()

End Using

End Sub

After creating the line, I have tried to see the properties of the leader. In Misc,'Type' is always 'Line with no arrow' and I cannot force it 'Line with arrow'. I am using VS 2010, ACAD 2011 and framework 3.5.

Please help me in this regard.

Zakir

Re: Leader arrowhead is not created

Anonymous — Tue, 07 May 2013 16:10:47 GMT

Hi,

this code works for me well:

        Dim doc As Document = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument
        Dim ed As Editor = doc.Editor
        Dim db As Database = doc.Database
        'start a transaction
        Using tr As Transaction = db.TransactionManager.StartTransaction()

            Dim btr As BlockTableRecord = DirectCast(tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite, False), BlockTableRecord)
            Try

                Dim pts As New Point3dCollection()

                Dim opts As New PromptPointOptions(vbLf & "Pick leader arrow point: ")
                opts.AllowArbitraryInput = True
                opts.AllowNone = True
                opts.UseBasePoint = False
                opts.UseDashedLine = True

                Dim dp As New Point3d(Double.NegativeInfinity, 0, 0)

                While True

                    If Not Double.IsNegativeInfinity(dp.X) Then
                        opts.UseBasePoint = True
                        opts.BasePoint = dp
                    End If

                    Dim res As PromptPointResult = ed.GetPoint(opts)
                    If res.Status = PromptStatus.OK Then
                        pts.Add(res.Value)
                        dp = res.Value
                    Else

                        Exit While
                    End If
                    opts.Message = vbLf & "Next leader point or (Enter to exit): "
                End While

                Dim leader As New Leader()

                leader.SetDatabaseDefaults()

                'take the current annotative scale
                leader.Annotative = AnnotativeStates.True

                ' Get the current UCS, for different ucs
                Dim ucs As Matrix3d = ed.CurrentUserCoordinateSystem

                For Each p As Point3d In pts
                    Dim transformedPt As Point3d = p.TransformBy(ucs)
                    leader.AppendVertex(transformedPt)
                Next

                Dim leaderId As ObjectId = btr.AppendEntity(leader)

                tr.AddNewlyCreatedDBObject(leader, True)
                tr.Commit()
            Catch ex As System.Exception
                ed.WriteMessage(Environment.NewLine & ex.ToString())

            End Try
        End Using

e.g.

Re: Leader arrowhead is not created

Hallex — Tue, 07 May 2013 18:13:13 GMT

I 've added some settings to your code,

see my poor comments:

        <CommandMethod("CreateLeader")> _
        Public Sub Createleader()
            Application.SetSystemVariable("dimldrblk", ".") '"." comma means closed filled it also may be _dot,_dotsmall etc
            Dim acDoc As Document = Application.DocumentManager.MdiActiveDocument
            Dim acCurDb As Database = acDoc.Database
            Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()
                Dim acBlkTbl As BlockTable
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead)
                Dim acBlkTblRec As BlockTableRecord
                acBlkTblRec = acTrans.GetObject(acBlkTbl(BlockTableRecord.ModelSpace), OpenMode.ForWrite)

                Dim mtextId As ObjectId
                Dim mtx As MText = New MText()
                mtx.SetDatabaseDefaults()
                mtx.Contents = "FIRST LINE\PSECOND LINE"
                mtx.Location = New Point3d(4, 4, 0)
                mtx.TextHeight = 0.25
                mtx.Attachment = AttachmentPoint.MiddleLeft
                mtx.SetAttachmentMovingLocation(mtx.Attachment)
                mtextId = acBlkTblRec.AppendEntity(mtx)
                acTrans.AddNewlyCreatedDBObject(mtx, True)

                Dim acLdr As Leader = New Leader()
                acLdr.SetDatabaseDefaults()
                acLdr.AppendVertex(New Point3d(2, 2, 0))
                acLdr.AppendVertex(New Point3d(4, 4, 0))
                '______________________________________'
                'problem with arrow size, fix it here:
                acLdr.Dimasz = 0.25
                '______________________________________'
                acBlkTblRec.AppendEntity(acLdr)
                acTrans.AddNewlyCreatedDBObject(acLdr, True)
                acLdr.Annotation = mtextId
                acLdr.Dimsah = False
                acLdr.Dimtad = 0
                acLdr.Dimgap = 0.25
                acLdr.EvaluateLeader() 'just in case if annotation is added then evaluate leader
                acTrans.Commit()
            End Using
        End Sub

Re: Leader arrowhead is not created

Anonymous — Wed, 08 May 2013 08:56:05 GMT

Thanks e.g. for your code

Re: Leader arrowhead is not created

Anonymous — Wed, 08 May 2013 08:58:52 GMT

Hi Hallex,

Thanks for your code. It is working great as I wanted. I want to ask you another question. Can I put leader and annotation in one block. If yes how? Can you help me in this regard?

Zakir

Re: Leader arrowhead is not created

Hallex — Wed, 08 May 2013 09:37:03 GMT

Shortly you have do following insert block and use it as annotation object
here is example with using same way but for mleader:
http://www.acadnetwork.com/topic-210.0.html

Re: Leader arrowhead is not created

Anonymous — Wed, 08 May 2013 11:49:33 GMT

Thanks for a perfect example!

Re: Leader arrowhead is not created

Hallex — Wed, 08 May 2013 12:20:07 GMT

You're welcome
Cheers 🙂