AE+C#+无向网络最短路径分析

AE+C#+无向网络最短路径分析(转载)

http://www.gisall.com/html/63/151663-5310.html

界面：
加载网络

执行最短路径分析：

/// <summary> /// _pFtClass参数为Stops的要素类，_pPointC是用鼠标点的点生成的点的集合，最后一个参数是捕捉距离 /// </summary> /// <param name="_pNaContext"></param> /// <param name="_pFtClass"></param> /// <param name="_pPointC"></param> /// <param name="_pDist"></param> void NASolve(INAContext _pNaContext,IFeatureClass _pFtClass, IPointCollection _pPointC, double _pDist) { INALocator pNAlocator = _pNaContext.Locator; for (int i = 0; i < _pPointC.PointCount; i++) { IFeature pFt = _pFtClass.CreateFeature();
IRowSubtypes pRowSubtypes = pFt as IRowSubtypes;
pRowSubtypes.InitDefaultValues();
pFt.Shape = _pPointC.get_Point(i) as IGeometry;
IPoint pPoint = null;
INALocation pNalocation = null;
pNAlocator.QueryLocationByPoint(_pPointC .get_Point(i),ref pNalocation,ref pPoint,ref _pDist);
INALocationObject pNAobject = pFt as INALocationObject;
pNAobject.NALocation = pNalocation;
int pNameFieldIndex = _pFtClass.FindField("Name");
pFt.set_Value(pNameFieldIndex, pPoint.X.ToString() + "," + pPoint.Y.ToString());
int pStatusFieldIndex = _pFtClass.FindField("Status");
pFt.set_Value(pStatusFieldIndex, esriNAObjectStatus.esriNAObjectStatusOK);
int pSequenceFieldIndex = _pFtClass.FindField("Sequence");
pFt.set_Value(_pFtClass.FindField("Sequence"), ((ITable)_pFtClass).RowCount(null));
pFt.Store();
} }
/// <summary> /// 获取网络数据集 /// </summary> /// <param name="_pFeatureWs"></param> /// <param name="_pDatasetName"></param> /// <param name="_pNetDatasetName"></param> /// <returns></returns> INetworkDataset GetNetDataset(IFeatureWorkspace _pFeatureWs, string _pDatasetName,string _pNetDatasetName) {
ESRI.ArcGIS.Geodatabase.IDatasetContainer3 pDatasetContainer = null;
ESRI.ArcGIS.Geodatabase.IFeatureDataset pFeatureDataset = _pFeatureWs.OpenFeatureDataset(_pDatasetName); ESRI.ArcGIS.Geodatabase.IFeatureDatasetExtensionContainer pFeatureDatasetExtensionContainer = pFeatureDataset as ESRI.ArcGIS.Geodatabase.IFeatureDatasetExtensionContainer; // Dynamic Cast ESRI.ArcGIS.Geodatabase.IFeatureDatasetExtension pFeatureDatasetExtension = pFeatureDatasetExtensionContainer.FindExtension(ESRI.ArcGIS.Geodatabase.esriDatasetType.esriDTNetworkDataset); pDatasetContainer = pFeatureDatasetExtension as ESRI.ArcGIS.Geodatabase.IDatasetContainer3; // Dynamic Cast
ESRI.ArcGIS.Geodatabase.IDataset pNetWorkDataset = pDatasetContainer.get_DatasetByName(ESRI.ArcGIS.Geodatabase.esriDatasetType.esriDTNetworkDataset, _pNetDatasetName);
return pNetWorkDataset as ESRI.ArcGIS.Geodatabase.INetworkDataset; // Dynamic Cast }
/// <summary> /// 加载NetworkDataset到Map中 /// </summary> /// <param name="_pMap"></param> /// <param name="_pNetworkDataset"></param> void loadNet(IMap _pMap,INetworkDataset _pNetworkDataset) { INetworkLayer pNetLayer = new NetworkLayerClass();
pNetLayer.NetworkDataset = _pNetworkDataset;
_pMap.AddLayer(pNetLayer as ILayer); } /// <summary> /// 获取网络分析上下文，这个接口是网络分析中很重要的一个 /// </summary> /// <param name="_pNaSolver"></param> /// <param name="_pNetworkDataset"></param> /// <returns></returns> public INAContext GetSolverContext(INASolver _pNaSolver, INetworkDataset _pNetworkDataset) { //Get the Data Element
IDatasetComponent pDataComponent = _pNetworkDataset as IDatasetComponent;
IDEDataset pDeDataset = pDataComponent.DataElement;
INAContextEdit pContextEdit = _pNaSolver.CreateContext(pDeDataset as IDENetworkDataset, _pNaSolver.Name) as INAContextEdit;
//Prepare the context for analysis based upon the current network dataset schema. pContextEdit.Bind(_pNetworkDataset, new GPMessagesClass()); return pContextEdit as INAContext; } /// <summary> /// 获取NALayer /// </summary> /// <param name="_pNaSover"></param> /// <param name="_pNaContext"></param> /// <returns></returns>
INALayer GetNaLayer(INASolver _pNaSover,INAContext _pNaContext) { return _pNaSover.CreateLayer(_pNaContext); }
执行最短路径分析 IFeatureClass pftclass =pNaContext.NAClasses.get_ItemByName("Stops") as IFeatureClass;
NASolve(pNaContext, pftclass, pPointC, 5000);
IGPMessages gpMessages = new GPMessagesClass();
bool pBool= pNASolveClass.Solve(pNaContext, gpMessages, null);
代码全部献上，又不明白的大家可以一起讨论，我在准备文档，将会对写上所有的注释，稍后会和大家分享。