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.