Adding Radial Dimension to a Circular Column in Edit Extrusion mode using Revit API

By Saikat Bhattacharya

This short blog-post shows the use of NewRadialDimension() to create a radial dimension for a circular column in Edit Extrusion mode. This is similar to selecting a circular column in a Revit family in the Edit Extrusion mode using the Revit User Interface (UI).

The code is pretty self-explanatory and simple. To test this, you can create a circular extrusion (say a circular column in the Column.rft template) using the UI and then execute following code:

using System;

using System.Collections.Generic;

using System.Text;

 

using Autodesk.Revit.Attributes;

using Autodesk.Revit.DB;

using Autodesk.Revit.UI;

 

namespace Revit.SDK.Samples.HelloRevit.CS

{

 

  [Transaction(TransactionMode.Manual)]

  public class Command : IExternalCommand

  {

    public Result Execute(ExternalCommandData commandData,

      ref string message,

      ElementSet elements)

    {

      UIApplication app = commandData.Application;

      Document doc = app.ActiveUIDocument.Document;

 

      Reference extrusionRef = app.ActiveUIDocument.Selection.PickObject(

        Autodesk.Revit.UI.Selection.ObjectType.Element, "Select a circular extrusion: ");

      Extrusion extr = doc.GetElement(extrusionRef.ElementId) as Extrusion;

 

      Sketch skt = extr.Sketch;

      Arc arc = null;

      foreach (CurveArray curArr in skt.Profile)

      {

        foreach (Curve curve in curArr)

        {

          arc = curve as Arc;

          break;

        }

      }

      using (Transaction trans = new Transaction(doc, "Radial Dimension"))

      {

        trans.Start();

 

        Dimension radDim =

          doc.FamilyCreate.NewRadialDimension(

          doc.ActiveView,

          arc.Reference,

          arc.Center);

 

        trans.Commit();

      }

      return Result.Succeeded;

    }

  }

}

The dimension created can be verified when we click on the Column in the UI and click on the Edit Extrusion button to enter the Edit Extrusion mode.