pathfinder.cs

开发的地信系统

using System;
using System.Collections.Generic;
using System.Text;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.NetworkAnalysis;
using ESRI.ArcGIS.DataSourcesGDB;
using System.Diagnostics;
using System.Windows.Forms;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.esriSystem;


namespace Tom.GIS.ArcEngine.NetworkAnalysis
{
    /// <summary>
    /// 最佳路径分析类(提供分析的方法,结果及一些静态方法)
    /// </summary>
    public class PathFinder
    {
        #region 构造函数和变量

        private IGeometricNetwork _geometricNetwork;
        private IMap _map;
        private IPointToEID _pointToEID;
        private IEnumNetEID _enumNetEID_Junctions;
        private IEnumNetEID _enumNetID_Edges;
        private INetElements _netElements;

        //保存用户设定的经过和不经过和路口(Junction)及道路(Edge)
        public List<IJunctionFlag> junctionFlagList = new List<IJunctionFlag>();
        public List<IEdgeFlag> edgeFlagList = new List<IEdgeFlag>();
        public List<IJunctionFlag> junctionFlagUnList = new List<IJunctionFlag>();
        public List<IEdgeFlag> edgeFlagUnList = new List<IEdgeFlag>();

        /// <summary>
        /// 生成的最佳路径的长度
        /// </summary>
        public double PathLength
        {
            get
            {
                if (_polyLine != null)
                {
                    return ((int)_polyLine.Length * 100) / 100;
                }
                else
                {
                    return 0.0;
                }
            }
        }

        

        /// <summary>
        /// 用于进行道路引导的描述文字
        /// </summary>
        public string GuideText
        {
            get
            {
                if (_eidHelper == null || _enumNetID_Edges == null)
                    return "";

                IGeoFeatureLayer featureLayer = FunctionFactory.GetLayerByName("道路中心线",esriLayerType.GeoFeatureLayer, SystemFactory.MapControl.Map) as IGeoFeatureLayer;
                if (featureLayer == null)
                    return "";
                //解析结果道路序列
                IEnumEIDInfo enumEIDInfo = _eidHelper.CreateEnumEIDInfo(_enumNetID_Edges);
                enumEIDInfo.Reset();
                IEIDInfo eidInfo = enumEIDInfo.Next();
                List<NameLength> nameLengthList = new List<NameLength>();
                List<string> dirList = new List<string>();
                while (eidInfo != null)
                {
                    IFeature feature = eidInfo.Feature;
                    IGeometry geometry = eidInfo.Geometry;
                    IPolyline pline = geometry as IPolyline;


                    if (pline != null)
                    {
                        string name = featureLayer.FeatureClass.GetFeature((int)feature.get_Value(0)).get_Value(3).ToString();
                        double length = pline.Length;
                        NameLength nameLength = new NameLength();
                        nameLength.Name = name == "" ? "无名路" : name;
                        nameLength.Length = length;
                        bool addFlag = true;

                        for (int i = 0; i < nameLengthList.Count; i++)
                        {
                            if (nameLengthList[i].Name == name)
                            {
                                nameLengthList[i].Length += length;
                                addFlag = false;
                                break;
                            }
                        }
                        if (addFlag)
                        {
                            nameLengthList.Add(nameLength);

                            IPoint fromPoint = pline.FromPoint;
                            IPoint toPoint = pline.ToPoint;

                            string direction = "";
                            double ratioXY = Math.Abs(fromPoint.X - toPoint.X) / Math.Abs(fromPoint.Y - toPoint.Y);
                            if (ratioXY >= Math.Tan(22.5 * Math.PI / 180) && ratioXY <= Math.Tan(67.5 * Math.PI / 180))
                            {
                                direction = fromPoint.X > toPoint.X ? "西" : "东";
                                direction += fromPoint.Y > toPoint.Y ? "北" : "南";
                            }
                            else if (ratioXY < Math.Tan(22.5 * Math.PI / 180))
                            {
                                direction = fromPoint.Y > toPoint.Y ? "南" : "北";
                            }
                            else if (ratioXY > Math.Tan(67.5 * Math.PI / 180))
                            {
                                direction = fromPoint.X > toPoint.X ? "东" : "西";
                            }
                            dirList.Add(direction);


                        }

                    }

                    eidInfo = enumEIDInfo.Next();
                }

                //对结果字符串进行处理,生成可理解的道路引导字符串
                string resultString = "从起点出发,";
                for (int i = 0; i < nameLengthList.Count; i++)
                {
                    resultString += "沿" + nameLengthList[i].Name + "往" + dirList[i] + "走"
                        + Convert.ToInt32(nameLengthList[i].Length).ToString() +
                        "米,再";
                }


                resultString = resultString.Substring(0, resultString.Length - 2);

                resultString += "即可到达目的地。";
                return resultString;

            }
        }

        /// <summary>
        /// 用于存入数据库的最佳路径描述文字
        /// </summary>
        public string DescriptionText
        {
            get
            {
                if (_eidHelper == null)
                    return "";

                IGeoFeatureLayer featureLayer = FunctionFactory.GetLayerByName("道路中心线", esriLayerType.GeoFeatureLayer, SystemFactory.MapControl.Map) as IGeoFeatureLayer;
                if (featureLayer == null)
                    return "";
                //解析结果道路序列
                IEnumEIDInfo enumEIDInfo = _eidHelper.CreateEnumEIDInfo(_enumNetID_Edges);
                enumEIDInfo.Reset();
                IEIDInfo eidInfo = enumEIDInfo.Next();
                List<NameLength> nameLengthList = new List<NameLength>();
                List<string> dirList = new List<string>();
                while (eidInfo != null)
                {
                    IFeature feature = eidInfo.Feature;
                    IGeometry geometry = eidInfo.Geometry;
                    IPolyline pline = geometry as IPolyline;


                    if (pline != null)
                    {
                        string name = featureLayer.FeatureClass.GetFeature((int)feature.get_Value(0)).get_Value(3).ToString();
                        double length = pline.Length;
                        NameLength nameLength = new NameLength();
                        nameLength.Name = name == "" ? "无名路" : name;
                        nameLength.Length = length;
                        bool addFlag = true;

                        for (int i = 0; i < nameLengthList.Count; i++)
                        {
                            if (nameLengthList[i].Name == name)
                            {
                                nameLengthList[i].Length += length;
                                addFlag = false;
                                break;
                            }
                        }
                        if (addFlag)
                        {
                            nameLengthList.Add(nameLength);
                        }

                    }

                    eidInfo = enumEIDInfo.Next();
                }

                //对结果字符串进行处理,生成可理解的道路引导字符串
                string resultString = "";
                nameLengthList.ForEach(delegate(NameLength nl)
                {
                    resultString += nl.Name + "," + Convert.ToInt32(nl.Length).ToString() + "|";
                });

                resultString = resultString.Substring(0, resultString.Length - 1);

                return resultString;

            }
        }
        private ISelectionSetBarriers _selSetBarriers = new SelectionSetBarriersClass();

        private IEIDHelper _eidHelper;
        private IPolyline _polyLine;
        /// <summary>
        /// 根据点获取附近的点或线对象
        /// </summary>
        public IPointToEID PointToEID
        {
            get
            {
                return _pointToEID;
            }
        }

        /// <summary>
        /// EIDHelper
        /// </summary>
        public IEIDHelper EIDHelper
        {
            get
            {
                return _eidHelper;
            }
        }


        /// <summary>
        /// NetWork中的元素
        /// </summary>
        public INetElements NetElements
        {
            get
            {
                return _netElements;
            }
        }

        /// <summary>
        /// 适合于构造基于SDE数据的对象
        /// </summary>
        public PathFinder(IPropertySet iPropertySet,string featureDatasetName)
        {
            _map = SystemFactory.MapControl.Map;
            OpenSdeNetwork(iPropertySet,featureDatasetName);
        }

        /// <summary>
        /// 适合于构造基于Personal Geodatabase数据的对象
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="featureDatasetName"></param>
        public PathFinder(string fileName, string featureDatasetName)
        {
            _map = SystemFactory.MapControl.Map;
            OpenAccessNetwork(fileName, featureDatasetName);
            
        }

        public IGeometricNetwork GeometryNetwork
        {
            get
            {
                return _geometricNetwork;
            }
        }

        /// <summary>
        /// 最佳路径Polyline对象
        /// </summary>
        public IPolyline ResultPolyline
        {
            get
            {
                if (_enumNetID_Edges == null)
                    return null;
                if (_polyLine != null)
                    return _polyLine;
                _polyLine = new PolylineClass();
                IGeometryCollection geoCollection = _polyLine as IGeometryCollection;

                //解析结果道路序列
                IEnumEIDInfo enumEIDInfo = _eidHelper.CreateEnumEIDInfo(_enumNetID_Edges);
                enumEIDInfo.Reset();
                IEIDInfo eidInfo = enumEIDInfo.Next();
                while (eidInfo != null)
                {
                    IGeometry geometry = eidInfo.Geometry;