RevitSdkSamples/SDK/Samples/NewHostedSweep/CS/Creators/SlabEdgeCreator.cs

//
// (C) Copyright 2003-2019 by Autodesk, Inc.
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using System;
using System.Collections.Generic;
using System.Text;
using Autodesk.Revit.DB;
using Autodesk.Revit;
using System.Windows.Forms;
using System.Collections;

namespace Revit.SDK.Samples.NewHostedSweep.CS
{
    /// <summary>
    /// Provides functions to create SlabEdge.
    /// </summary>
    public class SlabEdgeCreator : HostedSweepCreator
    {
        /// <summary>
        /// Constructor takes Revit.Document as parameter.
        /// </summary>
        /// <param name="rvtDoc">Revit document</param>
        public SlabEdgeCreator(Autodesk.Revit.UI.UIDocument rvtDoc)
            : base(rvtDoc)
        {
        }

        /// <summary>
        /// Edges which SlabEdge can be created on.
        /// </summary>
        private Dictionary<Autodesk.Revit.DB.Element, List<Edge>> m_floorSlabEdges;

        /// <summary>
        /// Filter all the edges from the element which SlabEdge can be created on.
        /// </summary>
        /// <param name="elem"></param>
        private void FilterEdgesForSlabEdge(Autodesk.Revit.DB.Element elem)
        {
            Transaction transaction = new Transaction(this.RvtDocument, "FilterEdgesForSlabEdge");
            transaction.Start();

            // Note: This method will create a SlabEdge with no reference.
            // In the future, API may not allow to create such SlabEdge with 
            // no references, invoke this methods like this may throw exception.
            // 
            SlabEdge slabEdge = m_rvtDoc.Create.NewSlabEdge(null, new ReferenceArray());

            List<Edge> floorEdges = m_floorSlabEdges[elem];
            foreach (Edge edge in m_elemGeom[elem].EdgeBindingDic.Keys)
            {
                if (edge.Reference == null) continue;
                try
                {
                    slabEdge.AddSegment(edge.Reference);
                    // AddSegment successfully, so this edge can be used to crate SlabEdge.
                    floorEdges.Add(edge);
                }
                catch (Autodesk.Revit.Exceptions.ArgumentOutOfRangeException)
                {
                    // Exception, this edge will be discard.
                }
            }
            // Delete this element, because we just use it to filter the edges.
            m_rvtDoc.Delete(slabEdge.Id);

            transaction.RollBack();
        }

        /// <summary>
        /// A string indicates this creator just for Floor SlabEdge creation.
        /// </summary>
        public override string Name
        {
            get
            {
                return "Floor Slab Edge";
            }
        }

        /// <summary>
        /// All SlabEdge types in Revit active document.
        /// </summary>
        public override IEnumerable AllTypes
        {
            get
            {
                FilteredElementCollector filteredElementCollector = new FilteredElementCollector(m_rvtDoc);
                filteredElementCollector.OfClass(typeof(SlabEdgeType));
                return filteredElementCollector;
            }
        }

        /// <summary>
        /// Create a SlabEdge.
        /// </summary>
        /// <param name="symbol">SlabEdge type</param>
        /// <param name="refArr">SlabEdge reference array</param>
        /// <returns>Created SlabEdge</returns>
        protected override HostedSweep CreateHostedSweep(ElementType symbol, ReferenceArray refArr)
        {
            SlabEdge slabEdge = m_rvtDoc.Create.NewSlabEdge(symbol as SlabEdgeType, refArr);
            if (slabEdge != null)
                // Avoid the Revit warning, flip the direction in horizontal direction.
                slabEdge.HorizontalFlip();
            return slabEdge;
        }

        /// <summary>
        /// Dictionary to store all the Floor=>Edges which SlabEdge can be created on.
        /// </summary>
        public override Dictionary<Autodesk.Revit.DB.Element, List<Edge>> SupportEdges
        {
            get
            {
                if (m_floorSlabEdges == null)
                {
                    m_floorSlabEdges = new Dictionary<Autodesk.Revit.DB.Element, List<Edge>>();

                    FilteredElementCollector collector = new FilteredElementCollector(m_rvtDoc);
                    collector.OfClass(typeof(Floor));
                    foreach (Element elem in collector.ToElements())
                    {
                        if (elem is Floor)
                        {
                            ElementGeometry solid = ExtractGeom(elem);
                            if (solid != null)
                            {
                                m_floorSlabEdges.Add(elem, new List<Edge>());
                                m_elemGeom.Add(elem, solid);
                                FilterEdgesForSlabEdge(elem);
                            }
                        }
                    }
                }
                return m_floorSlabEdges;
            }
        }
    }
}