implemented MEP utility methods, connect rolling offset to neighbours

BuildingCoder/BuildingCoder/CmdMepElementShape.cs

@@ -474,13 +474,14 @@ static public MEPSystem ExtractMechanicalOrPipingSystem(
         return system;
       }
 
-      // copied from sdk - TraverseSystem example
+      //
+      // Copied from Revit SDK TraverseSystem example
       //
       // (C) Copyright 2003-2010 by Autodesk, Inc.
       //
       /// <summary>
       /// Get the mechanical or piping system
-      /// from the connectors of selected element
+      /// from the connectors of selected element.
       /// </summary>
       /// <param name="connectors">Connectors of selected element</param>
       /// <returns>The found mechanical or piping system</returns>

BuildingCoder/BuildingCoder/CmdRollingOffset.cs

@@ -273,6 +273,8 @@ double remainingPipeLength
 
       using( Transaction tx = new Transaction( doc ) )
       {
+        Pipe pipe = null;
+
         tx.Start( "Rolling Offset" );
 
         if( _place_model_line )
@@ -295,7 +297,7 @@ double remainingPipeLength
         }
         else
         {
-          Pipe pipe = pipes[0];
+          pipe = pipes[0];
 
           if( _use_static_pipe_create )
           {
@@ -348,6 +350,15 @@ PipeType pipe_type_standard
           }
         }
 
+        if( null != pipe )
+        {
+          // Connect rolling offset pipe segment
+          // with its neighbours
+
+          Util.Connect( q0, pipes[0], pipe );
+          Util.Connect( q1, pipe, pipes[1] );
+        }
+
         tx.Commit();
       }
       return Result.Succeeded;

BuildingCoder/BuildingCoder/Properties/AssemblyInfo.cs

@@ -31,5 +31,5 @@
 //
 // You can specify all the values or you can default the Revision and Build Numbers
 // by using the '*' as shown below:
-[assembly: AssemblyVersion( "2014.0.106.2" )]
-[assembly: AssemblyFileVersion( "2014.0.106.2" )]
+[assembly: AssemblyVersion( "2014.0.106.3" )]
+[assembly: AssemblyFileVersion( "2014.0.106.3" )]

BuildingCoder/BuildingCoder/Util.cs

@@ -913,6 +913,148 @@ FilteredElementCollector collector
       return null;
     }
     #endregion // Element filtering
+
+    #region MEP utilities
+    /// <summary>
+    /// Return the given element's connector manager, 
+    /// using either the family instance MEPModel or 
+    /// directly from the MEPCurve connector manager
+    /// for ducts and pipes.
+    /// </summary>
+    static ConnectorManager GetConnectorManager(
+      Element e )
+    {
+      MEPCurve mc = e as MEPCurve;
+      FamilyInstance fi = e as FamilyInstance;
+
+      if( null == mc && null == fi )
+      {
+        throw new ArgumentException(
+          "Element is neither an MEP curve nor a fitting." );
+      }
+
+      return null == mc
+        ? fi.MEPModel.ConnectorManager
+        : mc.ConnectorManager;
+    }
+
+    /// <summary>
+    /// Return the element's connector at the given
+    /// location, and its other connector as well, 
+    /// in case there are exactly two of them.
+    /// </summary>
+    /// <param name="e">An element, e.g. duct, pipe or family instance</param>
+    /// <param name="location">The location of one of its connectors</param>
+    /// <param name="otherConnector">The other connector, in case there are just two of them</param>
+    /// <returns>The connector at the given location</returns>
+    static Connector GetConnectorAt(
+      Element e,
+      XYZ location,
+      out Connector otherConnector )
+    {
+      otherConnector = null;
+
+      Connector targetConnector = null;
+
+      ConnectorManager cm = GetConnectorManager( e );
+
+      bool hasTwoConnectors = 2 == cm.Connectors.Size;
+
+      foreach( Connector c in cm.Connectors )
+      {
+        if( c.Origin.IsAlmostEqualTo( location ) )
+        {
+          targetConnector = c;
+
+          if( !hasTwoConnectors )
+          {
+            break;
+          }
+        }
+        else if( hasTwoConnectors )
+        {
+          otherConnector = c;
+        }
+      }
+      return targetConnector;
+    }
+
+    /// <summary>
+    /// Return the connector in the set
+    /// closest to the given point.
+    /// </summary>
+    static Connector GetConnectorClosestTo(
+      ConnectorSet connectors,
+      XYZ p )
+    {
+      Connector targetConnector = null;
+      double minDist = double.MaxValue;
+
+      foreach( Connector c in connectors )
+      {
+        double d = c.Origin.DistanceTo( p );
+
+        if( d < minDist )
+        {
+          targetConnector = c;
+          minDist = d;
+        }
+      }
+      return targetConnector;
+    }
+
+    /// <summary>
+    /// Return the connector on the element 
+    /// closest to the given point.
+    /// </summary>
+    static Connector GetConnectorClosestTo(
+      Element e,
+      XYZ p )
+    {
+      ConnectorManager cm = GetConnectorManager( e );
+
+      return null == cm
+        ? null
+        : GetConnectorClosestTo( cm.Connectors, p );
+    }
+
+    /// <summary>
+    /// Connect two MEP elements at a given point p.
+    /// </summary>
+    /// <exception cref="ArgumentException">Thrown if
+    /// one of the given elements lacks connectors.
+    /// </exception>
+    public static void Connect(
+      XYZ p,
+      Element a,
+      Element b )
+    {
+      ConnectorManager cm = GetConnectorManager( a );
+
+      if( null == cm )
+      {
+        throw new ArgumentException(
+          "Element a has no connectors." );
+      }
+
+      Connector ca = GetConnectorClosestTo(
+        cm.Connectors, p );
+
+      cm = GetConnectorManager( b );
+
+      if( null == cm )
+      {
+        throw new ArgumentException(
+          "Element b has no connectors." );
+      }
+
+      Connector cb = GetConnectorClosestTo(
+        cm.Connectors, p );
+
+      ca.ConnectTo( cb );
+      //cb.ConnectTo( ca );
+    }
+    #endregion // MEP utilities
   }
 
   #region Extension Method Classes