/// <summary>
/// Services the area.
/// </summary>
/// <param name="networkDataset">The network dataset.</param>
public void ServiceArea(INetworkDataset networkDataset)
{
log.WriteLog("开始创建ServiceArea...");
IWorkspaceFactory workspaceFactory = new ShapefileWorkspaceFactoryClass();
IWorkspace workspace = workspaceFactory.OpenFromFile(Functions.g_WorkSpacePath, 0);
IFeatureWorkspace featureWorkspace = workspace as IFeatureWorkspace;
CreateSolverContext(networkDataset);
if (!LoadLocations(featureWorkspace, Functions.g_Hospital))
{
log.WriteLog("LoadLocations失败！");
}
log.WriteLog("ServiceArea创建完成！");
}
/// <summary>
/// Geodatabase function: get network dataset
/// </summary>
/// <param name="networkDataset">Input network dataset</param>
/// <returns>DE network dataset</returns>
public IDENetworkDataset GetDENetworkDataset(INetworkDataset networkDataset)
{
// Cast from the network dataset to the DatasetComponent
IDatasetComponent dsComponent = networkDataset as IDatasetComponent;
// Get the data element
return dsComponent.DataElement as IDENetworkDataset;
}
/// <summary>
/// Create NASolver and NAContext
/// </summary>
/// <param name="networkDataset">Input network dataset</param>
private void CreateSolverContext(INetworkDataset networkDataset)
{
if (networkDataset == null) return;
//Get the Data Element
IDENetworkDataset deNDS = GetDENetworkDataset(networkDataset);
INASolver naSolver = new NAServiceAreaSolverClass();
m_NAContext = naSolver.CreateContext(deNDS, naSolver.Name);
((INAContextEdit)m_NAContext).Bind(networkDataset, new GPMessagesClass());
}
/// <summary>
/// Loads the locations.
/// </summary>
/// <param name="featureWorkspace">The feature workspace.</param>
/// <param name="inputFacilities">The input facilities.</param>
/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
private bool LoadLocations(IFeatureWorkspace featureWorkspace, string inputFacilities)
{
IFeatureClass inputFeatureClass = null;
try
{
inputFeatureClass = featureWorkspace.OpenFeatureClass(inputFacilities);
}
catch (Exception)
{
log.WriteLog("Specified input feature class does not exist");
return false;
}
INamedSet classes = m_NAContext.NAClasses;
INAClass naClass = classes.get_ItemByName("Facilities") as INAClass;
// delete existing locations, except barriers
naClass.DeleteAllRows();
// Create a NAClassLoader and set the snap tolerance (meters unit)
INAClassLoader naClassLoader = new NAClassLoaderClass();
naClassLoader.Locator = m_NAContext.Locator;
((INALocator3)naClassLoader.Locator).MaxSnapTolerance = 500;
naClassLoader.NAClass = naClass;
// Create field map to automatically map fields from input class to NAClass
INAClassFieldMap naClassFieldMap = new NAClassFieldMapClass();
naClassFieldMap.CreateMapping(naClass.ClassDefinition, inputFeatureClass.Fields);
naClassLoader.FieldMap = naClassFieldMap;
// Avoid loading network locations onto non-traversable portions of elements
INALocator3 locator = m_NAContext.Locator as INALocator3;
locator.ExcludeRestrictedElements = true;
locator.CacheRestrictedElements(m_NAContext);
// load network locations
int rowsIn = 0;
int rowsLocated = 0;
IQueryFilter qf = new QueryFilterClass();
qf.WhereClause = "aaaaaaaaaaa";
naClassLoader.Load(inputFeatureClass.Search(qf, true) as ICursor, null, ref rowsIn, ref rowsLocated);
if (rowsLocated <= 0)
{
log.WriteLog("Facilities were not loaded from input feature class");
return false;
}
// Message all of the network analysis agents that the analysis context has changed
INAContextEdit naContextEdit = m_NAContext as INAContextEdit;
naContextEdit.ContextChanged();
return true;
}
