private byte[] QueryPoint(ESRI.ArcGIS.Geometry.IPoint location, double distance)
{
if (distance <= 0.0)
throw new ArgumentOutOfRangeException("distance");
// Buffer the point.
ITopologicalOperator topologicalOperator = (ESRI.ArcGIS.Geometry.ITopologicalOperator)location;
IGeometry queryGeometry = topologicalOperator.Buffer(distance);
// Query the feature class.
ISpatialFilter spatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilter();
spatialFilter.Geometry = queryGeometry;
spatialFilter.SpatialRel = ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum.esriSpatialRelIntersects;
spatialFilter.GeometryField = m_fcToQuery.ShapeFieldName;
IFeatureCursor resultsFeatureCursor = m_fcToQuery.Search(spatialFilter, true);
// Loop through the features, clip each geometry to the buffer
// and total areas by attribute value.
topologicalOperator = (ESRI.ArcGIS.Geometry.ITopologicalOperator)queryGeometry;
int classFieldIndex = m_fcToQuery.FindField(m_mapFieldToQuery);
// System.Collections.Specialized.ListDictionary summaryStatsDictionary = new System.Collections.Specialized.ListDictionary();
Dictionary<string, double> summaryStatsDictionary = new Dictionary<string, double>();
// Initialize a list to hold JSON geometries.
List<JsonObject> jsonGeometries = new List<JsonObject>();
IFeature resultsFeature = null;
while ((resultsFeature = resultsFeatureCursor.NextFeature()) != null)
{
// Clip the geometry.
IPolygon clippedResultsGeometry = (IPolygon)topologicalOperator.Intersect(resultsFeature.Shape,
ESRI.ArcGIS.Geometry.esriGeometryDimension.esriGeometry2Dimension);
clippedResultsGeometry.Densify(0, 0); // Densify to maintain curved appearance when converted to JSON.
// Convert the geometry to JSON and add it to the list.
JsonObject jsonClippedResultsGeometry = Conversion.ToJsonObject(clippedResultsGeometry);
jsonGeometries.Add(jsonClippedResultsGeometry);
// Get statistics.
IArea area = (IArea)clippedResultsGeometry;
string resultsClass = resultsFeature.get_Value(classFieldIndex) as string;
// If the class is already in the dictionary, add the current feature's area to the existing entry.
if (summaryStatsDictionary.ContainsKey(resultsClass))
summaryStatsDictionary[resultsClass] = (double)summaryStatsDictionary[resultsClass] + area.Area;
else
summaryStatsDictionary[resultsClass] = area.Area;
}
// Use a helper method to get a JSON array of area records.
JsonObject[] areaResultJson = CreateJsonRecords(summaryStatsDictionary) as JsonObject[];
// Create a JSON object of the geometry results and the area records.
JsonObject resultJsonObject = new JsonObject();
resultJsonObject.AddArray("geometries", jsonGeometries.ToArray());
resultJsonObject.AddArray("records", areaResultJson);
// Get byte array of json and return results.
byte[] result = Encoding.UTF8.GetBytes(resultJsonObject.ToJson());
return result;
}
//鼠标点击事件
private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
{
if (pMouseOperate == "ZoomIn")
{
axMapControl1.Extent = axMapControl1.TrackRectangle();
}
if (pMouseOperate == "ZoomOut")
{
IEnvelope penv = axMapControl1.Extent;
penv.Expand(2, 2, true);
axMapControl1.Extent = penv;
}
if (pMouseOperate == "Pan")
{
axMapControl1.Pan();
}
if (pMouseOperate == "Identify")
{
IPoint point = new ESRI.ArcGIS.Geometry.Point();
point.PutCoords(e.mapX, e.mapY);
IFeatureLayer pFeatureLayer = axMapControl1.get_Layer(0) as IFeatureLayer;
IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
string shapefieldname = pFeatureClass.ShapeFieldName;
ESRI.ArcGIS.Geodatabase.ISpatialFilter pSpatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilter();
pSpatialFilter.Geometry = point;
pSpatialFilter.SpatialRel = ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum.esriSpatialRelIntersects;
pSpatialFilter.set_OutputSpatialReference(shapefieldname, axMapControl1.SpatialReference);
pSpatialFilter.GeometryField = shapefieldname;
ESRI.ArcGIS.Geodatabase.IFeatureCursor pFeatureCursor = pFeatureClass.Search(pSpatialFilter, false);
ESRI.ArcGIS.Geodatabase.IFeature pFeature = pFeatureCursor.NextFeature();
if (pFeature != null)
{
axMapControl1.FlashShape(pFeature.Shape);
}
IFields pField = pFeature.Fields;
listFields.Items.Clear();
for (int i = 0; i <= pField.FieldCount - 1; i++)
{
listFields.Items.Add(pField.get_Field(i).Name + "=" + pFeature.get_Value(i));
}
}
}
// get features that intersect the buffered mouse click and return them as a list of IFeature
public List <IFeature> checkForIntersectingSegments(IPoint mousePoint, double buffer, IFeatureClass featureClass)
{
var envelope = mousePoint.Envelope;
envelope.Expand(buffer, buffer, false);
var geodataset = (IGeoDataset)featureClass;
string shapeFieldName = featureClass.ShapeFieldName;
ESRI.ArcGIS.Geodatabase.ISpatialFilter spatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilter();
spatialFilter.Geometry = envelope;
spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelCrosses; // website for other options edndoc.esri.com/arcobjects/9.2/ComponentHelp/esrigeodatabase/esrispatialrelenum.htm
spatialFilter.set_OutputSpatialReference(shapeFieldName, geodataset.SpatialReference);
ESRI.ArcGIS.Geodatabase.IFeatureCursor featureCursor = featureClass.Search(spatialFilter, false);
var features = new List <IFeature>();
ESRI.ArcGIS.Geodatabase.IFeature feature;
while ((feature = featureCursor.NextFeature()) != null)
{
features.Add(feature);
}
return(features);
}
private byte[] QueryPoint(ESRI.ArcGIS.Geometry.IPoint location, double distance)
{
if (distance <= 0.0)
throw new ArgumentOutOfRangeException("distance");
// Buffer the point.
ITopologicalOperator topologicalOperator = (ESRI.ArcGIS.Geometry.ITopologicalOperator)location;
IGeometry queryGeometry = topologicalOperator.Buffer(distance);
// Query the feature class.
ISpatialFilter spatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilter();
spatialFilter.Geometry = queryGeometry;
spatialFilter.SpatialRel = ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum.esriSpatialRelIntersects;
spatialFilter.GeometryField = m_fcToQuery.ShapeFieldName;
IFeatureCursor resultsFeatureCursor = m_fcToQuery.Search(spatialFilter, true);
// Loop through the features, clip each geometry to the buffer
// and total areas by attribute value.
topologicalOperator = (ESRI.ArcGIS.Geometry.ITopologicalOperator)queryGeometry;
int classFieldIndex = m_fcToQuery.FindField(m_mapFieldToQuery);
// System.Collections.Specialized.ListDictionary summaryStatsDictionary = new System.Collections.Specialized.ListDictionary();
Dictionary<string, double> summaryStatsDictionary = new Dictionary<string, double>();
// Initialize a list to hold JSON geometries.
List<JsonObject> jsonGeometries = new List<JsonObject>();
IFeature resultsFeature = null;
while ((resultsFeature = resultsFeatureCursor.NextFeature()) != null)
{
// Clip the geometry.
IPolygon clippedResultsGeometry = (IPolygon)topologicalOperator.Intersect(resultsFeature.Shape,
ESRI.ArcGIS.Geometry.esriGeometryDimension.esriGeometry2Dimension);
clippedResultsGeometry.Densify(0, 0); // Densify to maintain curved appearance when converted to JSON.
// Convert the geometry to JSON and add it to the list.
JsonObject jsonClippedResultsGeometry = Conversion.ToJsonObject(clippedResultsGeometry);
jsonGeometries.Add(jsonClippedResultsGeometry);
// Get statistics.
IArea area = (IArea)clippedResultsGeometry;
string resultsClass = resultsFeature.get_Value(classFieldIndex) as string;
// If the class is already in the dictionary, add the current feature's area to the existing entry.
if (summaryStatsDictionary.ContainsKey(resultsClass))
summaryStatsDictionary[resultsClass] = (double)summaryStatsDictionary[resultsClass] + area.Area;
else
summaryStatsDictionary[resultsClass] = area.Area;
}
// Use a helper method to get a JSON array of area records.
JsonObject[] areaResultJson = CreateJsonRecords(summaryStatsDictionary) as JsonObject[];
// Create a JSON object of the geometry results and the area records.
JsonObject resultJsonObject = new JsonObject();
resultJsonObject.AddArray("geometries", jsonGeometries.ToArray());
resultJsonObject.AddArray("records", areaResultJson);
// Get byte array of json and return results.
byte[] result = Encoding.UTF8.GetBytes(resultJsonObject.ToJson());
return result;
}