CREATE LEADER

rodrigohbm — Tue, 15 Jan 2019 18:56:09 GMT

Hello friends
I write to ask
it is possible to create an arrow with API
with three points
view image
I appreciate the information
regards

Re: CREATE LEADER

so-chong — Fri, 18 Jan 2019 22:08:57 GMT

Hi,

Besides the TextNote class, the Leader class has the Elbow and End properties is what you are looking for to create something like your image.

Things to remind are; what is your current active view scale and text style (text height) you are to execute the command/macro.

The Leader is influenced by changing it's active view scale and text style properties, keep that in mind if you want to place the leader in all kinds of different view scale.

Let's say the active view scale is 1:100 and the current text style (height) is 2.5 mm, something like this will do (converted macro C# to VB.NET);

    Public Sub CreateTwoSegmentsLeader()
         ' this macro is tested with a metric(mm) project unit setting

         Dim uidoc As UIDocument = Me.ActiveUIDocument
         Dim doc As Document = uidoc.Document
 
         Dim width As Double = 0.15
 
         ' check current textstyle (2.5mm) and viewscale (1:100)
         ' check current leader arrowhead is the one you want to use            
         Dim options As New TextNoteOptions()
         options.TypeId = doc.GetDefaultElementTypeId(ElementTypeGroup.TextNoteType)
         options.HorizontalAlignment = HorizontalTextAlignment.Left
         Dim point As XYZ = uidoc.Selection.PickPoint()
 
         Using t As New Transaction(doc, "Create Empty Text Note")
             t.Start()
             Dim note As TextNote = TextNote.Create(doc, uidoc.ActiveView.Id, point, width, " ", options)
 
             Dim l As Leader = note.AddLeader(TextNoteLeaderTypes.TNLT_STRAIGHT_L)
 
             ' change Y-coordinate when use different textstyle or viewscale
             l.Elbow = New XYZ(-5.0, -0.6315616797901, 0.0) + point
             l.[End] = New XYZ(-5.0, -5.0, 0.0) + point
 
             t.Commit()
         End Using
     End Sub

You should also refer to the Revit Lookup tool (go to->Methods -> GetLeaders - List'1) to determine the 'Y-coordinate' of the 'Anchor' and 'Elbow' property of the Leader and how accurate you want to set.

The less accurate the more 'wiggle' the line appears, that's what i had observed.

Hope this is useful for you and good luck.

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CREATE LEADER

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