Revit二次开发 ----＞管线连接

1.交互选择两条管道(先选主管，再选支管)

2.获取主管在支管上的投影点

3.在主管上获得支管的投影点

4.将两个投影点连接起来，的管道(即垂直管道)

5.生成弯头，生成三通

在生成管件之前，需要获得最近的两个或三个连接器。

最终效果

实现代码如下（带坡度的新支管需要优化生成）

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Autodesk.Revit.ApplicationServices; using Autodesk.Revit.Attributes; using Autodesk.Revit.DB.Architecture; using Autodesk.Revit.DB; using Autodesk.Revit.UI; using Autodesk.Revit.UI.Selection; using Autodesk.Revit.DB.Plumbing;   namespace Test {     [Transaction(TransactionMode.Manual)]     public class TestCommand : IExternalCommand      {         public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)         {             UIDocument Uidoc = commandData.Application.ActiveUIDocument;             Document Doc = Uidoc.Document;              Reference pipe1refer = Uidoc.Selection.PickObject(ObjectType.Element, new PipeFilter());             Reference pipe2refer = Uidoc.Selection.PickObject(ObjectType.Element, new PipeFilter());              Pipe pipe1 = Doc.GetElement(pipe1refer) as Pipe;             Pipe pipe2 = Doc.GetElement(pipe2refer) as Pipe;              ///获取管道定位直线             Line Pipe1Line = (pipe1.Location as LocationCurve).Curve as Line;             Line Pipe2Line = (pipe2.Location as LocationCurve).Curve as Line;              ////主管上支管的投影点             XYZ line2endpointproject = Pipe1Line.Project(Pipe2Line.GetEndPoint(0)).XYZPoint;              XYZ point1 = Pipe2Line.GetEndPoint(1);              ///让支管成为无限延伸的直线             Pipe2Line.MakeUnbound();              ////主管在支管投影点             XYZ projectpoint = Pipe2Line.Project(line2endpointproject).XYZPoint;               Transaction transaction = new Transaction(Doc, "shiwu");             transaction.Start("shiwu");              ///创建垂直新管道             Pipe NewPipe = Doc.GetElement(ElementTransformUtils.CopyElement(Doc, pipe1.Id, new XYZ(0, 0, 0)).FirstOrDefault()) as Pipe;             (NewPipe.Location as LocationCurve).Curve = Line.CreateBound(line2endpointproject, projectpoint);              //支管与新管生成弯头             ConnectTwopipesWithElbow(Doc, NewPipe as MEPCurve,pipe2 as MEPCurve);              ///主管和新管生成三通             MEPCurve mEPCurve3 =Doc.GetElement(PlumbingUtils.BreakCurve(Doc, pipe1.Id, line2endpointproject)) as MEPCurve;             ConnectTwopipesWithElbow(Doc,mEPCurve3,pipe1 as MEPCurve, NewPipe as MEPCurve);              transaction.Commit();              return Result.Succeeded;          }           //限制选择         public class PipeFilter : ISelectionFilter         {             public bool AllowElement(Element elem)             {                 if (elem is Pipe)                 {                     return true;                 }                 return false;             }              public bool AllowReference(Reference reference, XYZ position)             {                 return true;             }         }           //生成弯头         public static void ConnectTwopipesWithElbow(Document doc, MEPCurve pipe1, MEPCurve pipe2)         {             double minDistance = double.MaxValue;             Connector connector1, connector2;             connector1 = connector2 = null;              foreach (Connector con1 in pipe1.ConnectorManager.Connectors)             {                 foreach (Connector con2 in pipe2.ConnectorManager.Connectors)                 {                     var dis = con1.Origin.DistanceTo(con2.Origin);                     if (dis < minDistance)                     {                         minDistance = dis;                         connector1 = con1;                         connector2 = con2;                     }                  }             }              if (connector1 != null && connector2 != null)             {                     var elbow = doc.Create.NewElbowFitting(connector1, connector2);             }          }           ///生成三通         public static void ConnectTwopipesWithElbow(Document doc, MEPCurve pipe1, MEPCurve pipe2, MEPCurve pipe3)         {             double minDistance = double.MaxValue;             Connector connector1, connector2, connector3;             connector1 = connector2 = connector3 = null;              foreach (Connector con1 in pipe1.ConnectorManager.Connectors)             {                 foreach (Connector con2 in pipe2.ConnectorManager.Connectors)                 {                     var dis = con1.Origin.DistanceTo(con2.Origin);                     if (dis < minDistance)                     {                        minDistance = dis;
                        connector1 = con1;
                        connector2 = con2;
                    }

                }
            }

            minDistance = double.MaxValue;
            foreach (Connector con3 in pipe3.ConnectorManager.Connectors)
            {
                var dis = con3.Origin.DistanceTo(connector1.Origin);
                if (dis < minDistance)
                {
                    minDistance = dis;
                    connector3 = con3;
                }
            }


            if (connector1 != null && connector2 != null && connector3 != null)
            {


                    var elbow = doc.Create.NewTeeFitting(connector1, connector2, connector3);

            }
        }
    }
}