topic Re: How can I flip a section using the Revit 2017 API in Revit API Forum

How can I flip a section using the Revit 2017 API

Anonymous — Fri, 10 Feb 2017 21:43:37 GMT

I have a section that I want to flip using the Revit API just like doing it with the UI as seen below. I've tried using the ElementTransformUtils.MirrorElement but that only creates a copy with a duplicate view.

Here is a copy of my question on StackOverflow:

http://stackoverflow.com/questions/42164282/how-can-i-flip-a-live-section-with-the-revit-api

Re: How can I flip a section using the Revit 2017 API

FAIR59 — Mon, 13 Feb 2017 16:33:32 GMT

you can use another method from the ElementTransformUtils (Revit 2017).

ElementTransformUtils.MirrorElements(document, sel , _plane, false);

with the 2nd argument a list of ElementId's

with the 4th argument set to false, meaning no copies should be created and the elements should be mirrored directly.

Re: How can I flip a section using the Revit 2017 API

Anonymous — Tue, 14 Feb 2017 04:15:15 GMT

mirroring only works if you set the flag to true - it only creates new elements and does nothing if boolean is set to false. Ideas?

Re: How can I flip a section using the Revit 2017 API

FAIR59 — Tue, 14 Feb 2017 10:36:38 GMT

In my test, i selected the section in a plan view and mirrored that section. That works fine.

So you will have to find the section (Element of BuiltinCategory.OST_Viewers) of your view .

Re: How can I flip a section using the Revit 2017 API

FAIR59 — Tue, 14 Feb 2017 12:16:43 GMT

Here is my testcode

            Document document = revit.Application.ActiveUIDocument.Document;
            Autodesk.Revit.DB.View _view2mirror = document.ActiveView;
            List<Element> _sections = new FilteredElementCollector(document)
            .OfCategory(BuiltInCategory.OST_Viewers)
            .ToList();
            Element _section = null;
            foreach (Element _e in _sections)
            {
                if (_e.Name == _view2mirror.Name && _e.GetTypeId() == _view2mirror.GetTypeId()) _section = _e;
            }
            try
            {

                if( _section !=null)
            {
                using (Transaction t = new Transaction(document, "MirrorSection"))
                {
                    t.Start();
                    Plane _plane = Plane.CreateByNormalAndOrigin(_view2mirror.ViewDirection, _view2mirror.Origin);
                    ElementTransformUtils.MirrorElements(document, new List<ElementId> { _section.Id }, _plane, false);
                    t.Commit();
                }
            }
            return Result.Succeeded;
            }
            catch (Exception ex)
            {
                return Result.Failed;
            }

Re: How can I flip a section using the Revit 2017 API

Anonymous — Tue, 14 Feb 2017 14:38:35 GMT

Thanks FAIR59. This worked for me in Revit 2017. I didn't even think about trying the plural MirrorElements because I was just wanting to mirror one at a time and I assumed that it had the same function signature (other than single element vs. collection of elements) as the singular MirrorElement. It seems odd to me that they excluded the mirrorCopies parameter from the singular version of the function.

Re: How can I flip a section using the Revit 2017 API

Anonymous — Tue, 14 Feb 2017 14:55:38 GMT

ksobon, are you using Revit 2017 or an older version?