/// <summary>
/// Create random sample points in the extent of the spatial reference
/// </summary>
/// <param name="pointFeatureLayer">Point geometry feature layer used to the generate the points.</param>
/// <returns>Task{bool}</returns>
private Task<bool> constructSamplePoints(FeatureLayer pointFeatureLayer)
{
// 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 QueuedTask.Run(() =>
{
// start an edit operation to create new (random) point features
var createOperation = new EditOperation();
createOperation.Name = "Generate points";
createOperation.SelectNewFeatures = false;
// get the feature class associated with the layer
var featureClass = pointFeatureLayer.GetTable() as FeatureClass;
// define an area of interest. Random points are generated in the allowed
// confines of the allow extent range
var areaOfInterest = MapView.Active.Extent;
MapPoint newMapPoint = null;
// retrieve the class definition of the point feature class
var classDefinition = featureClass.GetDefinition() as FeatureClassDefinition;
// store the spatial reference as its own variable
var spatialReference = classDefinition.GetSpatialReference();
// create 20 new point geometries and queue them for creation
for (int i = 0; i < 20; i++)
{
// generate either 2D or 3D geometries
if (classDefinition.HasZ())
newMapPoint = MapPointBuilder.CreateMapPoint(randomGenerator.NextCoordinate(areaOfInterest, true), spatialReference);
else
newMapPoint = MapPointBuilder.CreateMapPoint(randomGenerator.NextCoordinate(areaOfInterest, false), spatialReference);
// queue feature creation
createOperation.Create(pointFeatureLayer, newMapPoint);
}
// execute the edit (feature creation) operation
return createOperation.ExecuteAsync();
});
}
/// <summary>
/// Create a single multi-point feature that is comprised of 20 points.
/// </summary>
/// <param name="multiPointLayer">Multi-point geometry feature layer used to add the multi-point feature.</param>
/// <returns></returns>
private Task constructSampleMultiPoints(FeatureLayer multiPointLayer)
{
// create a random number generator
var randomGenerator = new Random();
// the database and geometry interactions are considered fine-grained and need to be executed on
// a separate thread
return QueuedTask.Run(() =>
{
// get the feature class associated with the layer
var featureClass = multiPointLayer.GetTable() as FeatureClass;
var featureClassDefinition = featureClass.GetDefinition() as FeatureClassDefinition;
// store the spatial reference as its own variable
var spatialReference = featureClassDefinition.GetSpatialReference();
// define an area of interest. Random points are generated in the allowed
// confines of the allow extent range
var areaOfInterest = MapView.Active.Extent;
// start an edit operation to create new (random) multi-point feature
var createOperation = new EditOperation();
createOperation.Name = "Generate multipoints";
// retrieve the class definition of the point feature class
var classDefinition = featureClass.GetDefinition() as FeatureClassDefinition;
// create a list to hold the 20 coordinates of the multi-point feature
IList<Coordinate> coordinateList = new List<Coordinate>(20);
for (int i = 0; i < 20; i++)
{
// generate either 2D or 3D geometries
if (classDefinition.HasZ())
coordinateList.Add(randomGenerator.NextCoordinate(areaOfInterest, true));
else
coordinateList.Add(randomGenerator.NextCoordinate(areaOfInterest, false));
}
var newPoints = MultipointBuilder.CreateMultipoint(coordinateList, classDefinition.GetSpatialReference());
// create and execute the feature creation operation
createOperation.Create(multiPointLayer, newPoints);
return createOperation.ExecuteAsync();
});
}