Dimension a Legend Component

[Anonymous]

I want to create a dimension for a legend by Revit 2018 API. When I run the Add-in, It Worked,but the dimension is invisible and the dimension value is a negative number. If i create a new detailline, and use the reference of the detailline, the dimension is correct. But i don't want to create detailline. what can i do?

this is my code:

Transaction trans = new Transaction(m_Doc);
trans.SetName("create dimension");
trans.Start();
Reference reference = uIDocument.Selection.PickObject(Autodesk.Revit.UI.Selection.ObjectType.Element, "pick a legend");
ReferenceArray references = new ReferenceArray();
Element element = m_Doc.GetElement(reference);
List<Edge> edges = GetEdges(element);   //get two Parallel edges

references.Append(edges.ElementAt(0).Reference);
references.Append(edges.ElementAt(1).Reference);

Line left_edge = edges.ElementAt(0).AsCurve() as Line;
Line right_edge = edges.ElementAt(1).AsCurve() as Line;

Line line = Line.CreateBound(left_edge.GetEndPoint(0), right_edge.GetEndPoint(1));

Dimension dim = m_Doc.Create.NewDimension(view, line, references);

trans.Commit();

private List<Edge> GetEdges(Element element)
{
    List<Edge> edges = new List<Edge>();
    Options options = new Options
    {
        ComputeReferences = true,
        IncludeNonVisibleObjects = false
    };
    var geoEle = element.get_Geometry(options);
    foreach (var item in geoEle)
    {
        GeometryInstance geometryInstance = item as GeometryInstance;
        if (geometryInstance != null)
       {
            GeometryElement geometryElement = geometryInstance.GetInstanceGeometry();
            foreach (GeometryObject geoObject in geometryElement)
            {
                if (geoObject is Solid)
                {
                    Solid solid = geoObject as Solid;
                    if (!solid.Faces.IsEmpty)
                    {
                        foreach(Face face in solid.Faces)
                        {
                            PlanarFace p_face = face as PlanarFace;
                            if (p_face.FaceNormal.IsAlmostEqualTo(XYZ.BasisZ))
                            {
                                EdgeArray edgeArray = p_face.EdgeLoops.get_Item(0);
                                foreach (Edge edge in edgeArray)
                                {
                                      Line line = edge.AsCurve() as Line;
                                      if (line.Direction.IsAlmostEqualTo(XYZ.BasisY) || line.Direction.IsAlmostEqualTo(XYZ.BasisY.Negate()))
                                      {
                                           edges.Add(edge);
                                      }
                                  }
                               }
                          }
                    }
                }
               if (edges.Count > 0)
               {
                    break;
               }
          }
     }
}
return edges;
}

[FAIR59 · Accepted solution]

If you want to dimension system families (walls, floors etc.), you are out of luck, it can't be done.

For user-families you have to use the symbol geometry

GeometryElement geometryElement = geometryInstance.GetSymbolGeometry();
         	  	    

Symbolgeometry is in local (family) coordinate space, so  you have to transform it into model-space using the geometryInstance.Transform.

[Anonymous]

I found a way to create the dimension,but I don't know if it work correctly for all legend.

I create a dimension for a  legend by UI, and use API to get the representation of the dimension's reference.

The string of representation is like this: element.UniqueId + ":0:INSTANCE:" + PlanarFace.Reference..ConvertToStableRepresentation(m_Doc).

So, in my add-in, when i get the planarfaces, I build the string, and use "Reference.ParseFromStableRepresentation()" to create reference. I create the dimension by the references. It work correctly.

[Anonymous]

When I create a dimension for a window in viewplan, I can get a center line of the window frame. But in a legend view, I can't get this line. If  I want to dimension this. I must create a detailline ? 

[634914927]

I have the same problem as you: can't get a center line of the window frame