topic Re: How do i retrieve the start and end points of an element? in Revit API Forum

How do i retrieve the start and end points of an element?

jmadeley37KVE — Mon, 30 Jan 2023 08:54:51 GMT

Hi all,

I've inserted an Adaptive Family Instance in my model using the Revit API and now need to add some annotations on a view. The adaptive family required a start and end point (P1 and P2) to insert, is there a way I can convert the element.Location prooperty to a LocationCurve in Revit 2023?

I have tried casting:

var locationCurve = element.Location as LocationCurve;

but this throws a Null Reference Exception. If anyone knows a way to do this in my version of Revit I would really appreciate the help 🙂

Thanks

Jack

Re: How do i retrieve the start and end points of an element?

jmadeley37KVE — Mon, 30 Jan 2023 09:33:30 GMT

Hi Marty,

Thanks for the above. I have previously tried casting to a LocationCurve property, but this seems to throw a NullReferenceException. I have checked that the element.Location property exists and is not null, so it looks like the issue is the actual casting.

Is there any other way i could do this?

Thanks

Jack

Re: How do i retrieve the start and end points of an element?

jmadeley37KVE — Mon, 30 Jan 2023 11:04:46 GMT

After doing some digging through the documentation, I think I have come up with a way to get the co-ordinates.

If you use the method GetFamilyPointPlacementReferences() on the element, you are returned an IList<FamilyPointPlacementReference> object. With this list you can use a Linq Select statement to get the Location object and inside the transform is the origin XYZ.

The code looks like this:

var references = element.GetFamilyPointPlacementReference().Select(x => x.Location.Origin)

The references object is a series of XYZ points that we can then use for any further logic. It looks like the FamilyPointPlacementReference's that are returned from the GetFamilyPointPlacementReference() method have a name which in my case were "END1" and "END2". In my case this worked perfectly for finding the start and end points.