RevitAPI: Create dimension on detail component

中文链接

By Aaron Lu

Below are 2 detail components, each is actually a detail line in the family.

What dimension we want to create is like this:

We know the Document.Create.NewDimension method is:

Dimension NewDimension(View view, 
    Line line, ReferenceArray references)

First 2 arguments are easy: one is the view to create on, the other is the position of the dimension,

So the last one ReferenceArray is the references of the geometry object on these 2 components, but how to get them?

Obviously, using (FamilyInstance.Location as LocationCurve).Curve.Reference, we can only get null reference

So, only Element.get_Geometry way is left, then here is the code:

private static Line GetReferenceOfDetailComponent(Element element,
    View view)
{
    Options options = new Options();
    options.ComputeReferences = true;
    options.IncludeNonVisibleObjects = true;
    if (view != null)
        options.View = view;
    else
        options.DetailLevel = ViewDetailLevel.Fine;
    var geoElem = element.get_Geometry(options);
    foreach (var item in geoElem)
    {
        Line line = item as Line;
        if (line != null)
        {
            //in this case, code will never be executed to here
        }
        else
        {
            GeometryInstance geoInst = item as GeometryInstance;
            if (geoInst != null)
            {
                GeometryElement geoElemTmp = 
                    geoInst.GetSymbolGeometry();
                foreach (GeometryObject geomObjTmp in geoElemTmp)
                {
                    Line line2 = geomObjTmp as Line;
                    if (line2 != null)
                    {
                        //check if it is what you want
                        if (line2.GraphicsStyleId.IntegerValue == 355)
                        {
                            return line2;
                        }
                    }
                }
            }
        }
    }
    return null;
}

Note:

• Options.ComputeReferences must be set to true, otherwise the Reference of any geometry object is null
• When iterating GeometryElement, if we fount a GeometryInstance, then call GetSymbolGeometry rather than GetInstanceGeometry to get more geometry objects, otherwise, they are still not suitable to create dimension.