/// <summary>
/// Create sample polyline feature using the geometries from the point feature layer.
/// </summary>
/// <param name="polylineLayer">Polyline geometry feature layer used to add the new features.</param>
/// <param name="pointLayer">The geometries from the point layer are used as vertices for the new line features.</param>
/// <returns></returns>
private Task <bool> constructSamplePolylines(FeatureLayer polylineLayer, FeatureLayer pointLayer)
{
// execute the fine grained API calls on the CIM main thread
return(QueuingTaskFactory.StartNew(() =>
{
// get the underlying feature class for each layer
var polylineFeatureClass = polylineLayer.GetTableAsync().Result as FeatureClass;
var pointFeatureClass = pointLayer.GetTableAsync().Result as FeatureClass;
// construct a cursor for all point features, since we want all feature there is no
// QueryFilter required
var pointCursor = pointFeatureClass.Search(null, false);
// retrieve the feature class schema information for the feature classes
var polylineDefinition = polylineFeatureClass.Definition as FeatureClassDefinition;
var pointDefinition = pointFeatureClass.Definition as FeatureClassDefinition;
// initialize a counter variable
int pointCounter = 0;
// initialize a list to hold 5 coordinates that are used as vertices for the polyline
var lineCoordinates = new List <Coordinate>(5);
// set up the edit operation for the feature creation
var createOperation = EditingModule.CreateEditOperation();
createOperation.Name = "Create polylines";
// loop through the point features
while (pointCursor.MoveNext())
{
pointCounter++;
var pointFeature = pointCursor.Current as Feature;
// add the feature point geometry as a coordinate into the vertex list of the line
// - ensure that the projection of the point geometry is converted to match the spatial reference of the line
lineCoordinates.Add(((MapPoint)GeometryEngine.Project(pointFeature.Shape, polylineDefinition.SpatialReference)).Coordinate);
// for every 5 geometries, construct a new polyline and queue a feature create
if (pointCounter % 5 == 0)
{
var newPolyline = new Polyline(lineCoordinates, polylineDefinition.SpatialReference);
createOperation.Create(polylineLayer, newPolyline);
lineCoordinates = new List <Coordinate>(5);
}
}
// execute the edit (create) operation
var t = createOperation.ExecuteAsync().Result;
// save the edits
return EditingModule.SaveEditsAsync();
}));
}
/// <summary>
/// Create random sample points in the extent of the spatial reference
/// </summary>
/// <param name="pointLayer">Point geometry feature layer used to the generate the points.</param>
/// <returns>Task of bool</returns>
private Task <bool> constructSamplePoints(FeatureLayer pointLayer)
{
// create a random number generator
var randomGenerator = new Random();
// the database and geometry interactions are considered fine-grained and must be executed on
// the main CIM thread
return(QueuingTaskFactory.StartNew(() =>
{
// get the feature class associated with the layer
var featureClass = pointLayer.GetTableAsync().Result as FeatureClass;
// retrieve the class definition of the point feature class
var classDefinition = featureClass.Definition as FeatureClassDefinition;
// store the spatial reference as its own variable
SpatialReference spatialReference = featureClass.SpatialReference;
// define an area of interest. Random points are generated in the allowed
// confines of the allow extent range
var areaOfInterest = MappingModule.ActiveMapView.GetExtentAsync().Result;
// start an edit operation to create new (random) point features
var createOperation = EditingModule.CreateEditOperation();
createOperation.Name = "Generate points";
// create 20 new point geometries and queue them for creation
for (int i = 0; i < 20; i++)
{
MapPoint newMapPoint = null;
// generate either 2D or 3D geometries
if (classDefinition.HasZ)
{
newMapPoint = new MapPoint(randomGenerator.NextCoordinate(areaOfInterest, true), spatialReference);
}
else
{
newMapPoint = new MapPoint(randomGenerator.NextCoordinate(areaOfInterest, false), spatialReference);
}
// queue feature creation
createOperation.Create(pointLayer, newMapPoint);
}
// execute the edit (feature creation) operation
var t = createOperation.ExecuteAsync().Result;
return EditingModule.SaveEditsAsync().Result;
}));
}
/// <summary>
/// Create sample polygon feature using the point geometries from the multi-point feature using the
/// ConvexHull method provided by the GeometryEngine.
/// </summary>
/// <param name="polygonLayer">Polygon geometry feature layer used to add the new feature.</param>
/// <param name="lineLayer">The polyline feature layer containing the features used to construct the polygon.</param>
/// <returns></returns>
private Task <bool> constructSamplePolygon(FeatureLayer polygonLayer, FeatureLayer lineLayer)
{
// execute the fine grained API calls on the CIM main thread
return(QueuingTaskFactory.StartNew(() =>
{
// get the underlying feature class for each layer
var polygonFeatureClass = polygonLayer.GetTableAsync().Result as FeatureClass;
var lineFeatureClass = lineLayer.GetTableAsync().Result as FeatureClass;
// construct a cursor to retrieve the line features
var lineCursor = lineFeatureClass.Search(null, false);
// retrieve the feature class schema information for the feature class
var polygonDefinition = polygonFeatureClass.Definition as FeatureClassDefinition;
var polylineDefinition = lineFeatureClass.Definition as FeatureClassDefinition;
// set up the edit operation for the feature creation
var createOperation = EditingModule.CreateEditOperation();
createOperation.Name = "Create polygons";
List <CoordinateCollection> combinedCoordinates = new List <CoordinateCollection>();
while (lineCursor.MoveNext())
{
// retrieve the first feature
var lineFeature = lineCursor.Current as Feature;
// add the coordinate collection of the current geometry into our overall list of collections
var polylineGeometry = lineFeature.Shape as Polyline;
combinedCoordinates.AddRange(polylineGeometry.Paths);
}
// use the ConvexHull method from the GeometryEngine to construct the polygon geometry
var newPolygon = Polygon.Clone(GeometryEngine.ConvexHull(new Polyline(combinedCoordinates,
lineFeatureClass.SpatialReference))) as Polygon;
// queue the polygon creation
createOperation.Create(polygonLayer, newPolygon);
// execute the edit (polygon create) operation
var t = createOperation.ExecuteAsync().Result;
// save the edits
return EditingModule.SaveEditsAsync();
}));
}
