/// <summary>
/// Performs an identify operation with the provided geometry.
/// When identifying layers, typically a small envelope is passed in rather than a point to account for differences in
/// the precision of the display and the feature geometry.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="geometry">The geometry.</param>
/// <param name="trackCancel">
/// The cancel tracker object to monitor the Esc key and to terminate processes at the request of
/// the user.
/// </param>
/// <returns>
/// Returns a <see cref="IEnumerable{IFeatureIdentifyObj}" /> representing the features that have been identified.
/// </returns>
/// <exception cref="System.ArgumentNullException">geometry</exception>
/// <remarks>
/// On a FeatureIdentifyObject, you can do a QI to the IIdentifyObj interface to get more information about the
/// identified feature. The IIdentifyObj interface returns the window handle, layer, and name of the feature; it has
/// methods to flash the
/// feature in the display and to display a context menu at the Identify location.
/// </remarks>
public static IEnumerable <IFeatureIdentifyObj> Identify(this IFeatureLayer source, IGeometry geometry, ITrackCancel trackCancel)
{
if (geometry == null)
{
throw new ArgumentNullException("geometry");
}
if (source != null)
{
IIdentify2 identify = (IIdentify2)source;
IArray array = identify.Identify(geometry, trackCancel);
if (array != null)
{
for (int i = 0; i < array.Count; i++)
{
if (trackCancel != null && !trackCancel.Continue())
{
break;
}
IFeatureIdentifyObj featureIdentify = array.Element[i] as IFeatureIdentifyObj;
yield return(featureIdentify);
}
}
}
}
/// <summary>
/// 判断鼠标点击处有无巷道要素
/// </summary>
/// <param name="m_hookHelper"></param>
/// <param name="pMousePoint">鼠标点</param>
/// <param name="pFeatureLayer">导线点图层</param>
/// <param name="theFeature">返回离鼠标最近的导线点</param>
public void TestExistPointFeature(IHookHelper m_hookHelper, IPoint pMousePoint, IFeatureLayer pFeatureLayer, ref IFeature theFeature)
{
ArrayList pSelected = new ArrayList();
IFeatureClass pFeatureClass;
ISelectionEnvironment pSelectionEnvironment;
IFeature pFeature = null;
IGeometry pGeometry;
ITopologicalOperator pTopolagicalOperator;
double dLength;
IEnvelope pSrchEnv;
pSelectionEnvironment = new SelectionEnvironmentClass();
dLength = pSelectionEnvironment.SearchTolerance;
pGeometry = pMousePoint;
dLength = DataEditCommon.ConvertPixelDistanceToMapDistance(m_hookHelper.ActiveView, dLength);
pSrchEnv = pMousePoint.Envelope;
pSrchEnv.Width = dLength;
pSrchEnv.Height = dLength;
pSrchEnv.CenterAt(pMousePoint);
pTopolagicalOperator = (ITopologicalOperator)pGeometry;
IGeometry pBuffer = pTopolagicalOperator.Buffer(dLength);
pGeometry = pBuffer;
IFeature pFeat = null;
IMap pMap = m_hookHelper.FocusMap;
pFeatureClass = pFeatureLayer.FeatureClass;
IIdentify2 pID = pFeatureLayer as IIdentify2;
//IArray pArray = pID.Identify(pSrchEnv, null);
IArray pArray = pID.Identify(pGeometry, null);
IFeatureIdentifyObj pFeatIdObj;
IRowIdentifyObject pRowObj;
if (pArray != null)
{
for (int j = 0; j < pArray.Count; j++)
{
if (pArray.Element[j] is IFeatureIdentifyObj)
{
pFeatIdObj = pArray.Element[j] as IFeatureIdentifyObj;
pRowObj = pFeatIdObj as IRowIdentifyObject;
pFeature = pRowObj.Row as IFeature;
pSelected.Add(pFeature);
}
}
pArray.RemoveAll();
}
theFeature = pFeature;
return;
//GetClosestFeatureInCollection(m_hookHelper, dLength, pSelected, pMousePoint, ref pFeat);
//if (pFeat != null)
// theFeature = pFeat;
//else
// theFeature = null;
}
private IArray Identify(ILayer identifyLayer, IGeometry identifyGeom)
{
//保存结果的变量
IArray identifyObjs = null;
//设置查询形状
if (identifyGeom == null)
{
//返回空值
return(identifyObjs);
}
//若是点的话做点的缓冲区
IGeometry hitGeometry = identifyGeom;
//判断图层类型,设置点击要素
if (hitGeometry.GeometryType == esriGeometryType.esriGeometryPoint)
{
ITopologicalOperator topoOp = identifyGeom as ITopologicalOperator;
hitGeometry = topoOp.Buffer(1);
}
///判断图层的类型并作相应处理
///图层是要素图层
if (identifyLayer is IFeatureLayer)
{
//获取要素图层
IFeatureLayer featureLayer = identifyLayer as IFeatureLayer;
//开始获取信息操作
IIdentify2 identify2 = featureLayer as IIdentify2;
//获取查询结果
identifyObjs = identify2.Identify(hitGeometry, null);
}
///图层是栅格数据层
else if (identifyLayer is IRasterLayer)
{
}
//返回获取要素的集合
return(identifyObjs);
}
public override void OnMouseDown(int Button, int Shift, int X, int Y)
{
if (m_pActiveView == null || Button != 1)
{
return;
}
ArrayList pSelected = new ArrayList();
IFeatureClass pFeatureClass;
IPoint pPoint;
ISelectionEnvironment pSelectionEnvironment;
IFeature pFeature;
IGeometry pGeometry;
ITopologicalOperator pTopolagicalOperator;
double dLength;
IEnvelope pSrchEnv;
pSelectionEnvironment = new SelectionEnvironmentClass();
dLength = pSelectionEnvironment.SearchTolerance;
pPoint = m_pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
pPoint = GIS.GraphicEdit.SnapSetting.getSnapPoint(pPoint);
pGeometry = pPoint;
dLength = Common.DataEditCommon.ConvertPixelDistanceToMapDistance(m_pActiveView, dLength);
pSrchEnv = pPoint.Envelope;
pSrchEnv.Width = dLength;
pSrchEnv.Height = dLength;
pSrchEnv.CenterAt(pPoint);
pTopolagicalOperator = (ITopologicalOperator)pGeometry;
IGeometry pBuffer = pTopolagicalOperator.Buffer(dLength);
pGeometry = pBuffer;
IFeatureLayer pFeatureLayer;
IFeature pFeat = null;
IMap pMap = m_hookHelper.FocusMap;
//for (int i = 0; i < pMap.LayerCount; i++)
//{
//if (pMap.get_Layer(i).Name !=Common.DataEditCommon.g_pLayer.Name) continue;//20140216 lyf 只对当前选择图层进行
//if (pMap.get_Layer(i).Visible == false || !(pMap.get_Layer(i) is IFeatureLayer))
//{
// continue;
//}
if (Common.DataEditCommon.g_pLayer == null)
{
return;
}
pFeatureLayer = Common.DataEditCommon.g_pLayer as IFeatureLayer;
pFeatureClass = pFeatureLayer.FeatureClass;
if (pFeatureClass == null)
{
return;
}
IIdentify2 pID = pFeatureLayer as IIdentify2;
IArray pArray = pID.Identify(pSrchEnv, null);
//20140216 lyf 没有选中图元情况处理
if (pArray == null)
{
MessageBox.Show(@"未选中当前图层的图元！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
//continue;
return;
}
IFeatureIdentifyObj pFeatIdObj;
IRowIdentifyObject pRowObj;
if (pArray != null)
{
for (int j = 0; j < pArray.Count; j++)
{
if (pArray.Element[j] is IFeatureIdentifyObj)
{
pFeatIdObj = pArray.Element[j] as IFeatureIdentifyObj;
pRowObj = pFeatIdObj as IRowIdentifyObject;
pFeature = pRowObj.Row as IFeature;
pSelected.Add(pFeature);
pSelected.Add(pFeatureLayer.Name);
pSelected.Add(0);
}
}
pArray.RemoveAll();
}
//}
GetClosestFeatureInCollection(dLength, pSelected, pPoint, ref pFeat);
if (pFeat != null)
{
if (m_pfrmFeatureAttribute == null)
{
m_pfrmFeatureAttribute = new FeatureAttribute(pFeat);
m_pfrmFeatureAttribute.StartPosition = FormStartPosition.CenterParent;
m_pfrmFeatureAttribute.Show();
}
else
{
m_pfrmFeatureAttribute.Close();
m_pfrmFeatureAttribute.Dispose();
m_pfrmFeatureAttribute = new FeatureAttribute(pFeat);
m_pfrmFeatureAttribute.StartPosition = FormStartPosition.CenterParent;
m_pfrmFeatureAttribute.Show();
}
}
}