RME二次开发之“修改矩形风管为圆形风管”即实现“天圆地方”连接。

当两个矩形风管用弯头连接的时候，如果把其中一个修改成圆形风管。

就会自动创建天圆地方。所以这里的问题就转移到，怎样修改矩形风管为圆形风管。

[Transaction(TransactionMode.Automatic)]
[Regeneration(RegenerationOption.Automatic)]
public class ChangeDuctKind : IExternalCommand
{
    public Result Execute(ExternalCommandData commandData, ref string messages, ElementSet elements)
    {
        try
        {
            UIDocument uidoc = commandData.Application.ActiveUIDocument;
            //得到选择的对象
            Selection selection = uidoc.Selection;
            ElementSet collection = selection.Elements;

            //遍历得到所有风管类型
            FilteredElementCollector collector = new FilteredElementCollector(uidoc.Document);
            collector.OfClass(typeof(DuctType));
            //if (collector != null)
            //    collector.OfCategory(BuiltInCategory.OST_Walls);
            IList<Element> list = collector.ToElements();

            DuctType dType = null;
            for (int i = 0; i < list.Count; i++)
            {
                if (list.ElementAt(i).Name == "T 形三通")//属于圆形风管
                    dType = list.ElementAt(i) as DuctType;
            }

            if (0 == collection.Size)
            {
                TaskDialog.Show("Revit", "You haven't selected any elements");
            }
            else
            {
                foreach (Element elem in collection)
                {
                    Duct duct = elem as Duct;
                    if (duct != null)
                    {
                        duct.DuctType = dType;//通过修改DuctType可以修改DuctKind
                    }
                }
            }
        }
        catch (Exception e)
        {
            messages = e.Message;
            return Result.Failed;
        }
        return Result.Succeeded;
    }
}

此法已过时，Revit2012可以直接使用NewEblowFitting()创建天圆地方连接。

from:http://revit.5d6d.com/thread-865-1-4.html