private void MapView_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (nameof(MapView.SpatialReference).Equals(e.PropertyName) && null != MapView.SpatialReference)
{
Task.Run(() =>
{
// Load the data
var inputFile = new FileInfo(Settings.Default.GeonamesFilePath);
var delimiter = Settings.Default.Delimiter;
switch (delimiter)
{
case @"\t":
delimiter = "\t";
break;
}
var clusterFile = new ClusterPointTextFile(inputFile, delimiter, Settings.Default.XTokenIndex, Settings.Default.YTokenIndex, Settings.Default.StartRowIndex);
var distanceCalculator = new EuclideanDistanceCalculator();
var clusterer = new KMeansClusterer(distanceCalculator);
return clusterer.CreateClusters(clusterFile, Settings.Default.ClusterCount);
}).ContinueWith((clusterTask)=> {
// Create the graphics
var clusters = clusterTask.Result;
var random = new Random();
var wgs84 = SpatialReference.Create(4326);
foreach (var cluster in clusters)
{
// Create a graphic layer
var layer = new GraphicsLayer();
layer.RenderingMode = GraphicsRenderingMode.Static;
foreach (var element in cluster.Elements)
{
var clusterPoint = element as ClusterPoint;
if (null != clusterPoint)
{
var mapPoint = new MapPoint(clusterPoint.X, clusterPoint.Y, wgs84);
var projectedMapPoint = GeometryEngine.Project(mapPoint, MapView.SpatialReference);
var graphic = new Graphic(projectedMapPoint);
layer.Graphics.Add(graphic);
}
}
// Create a marker symbol
var markerSymbol = new SimpleMarkerSymbol();
markerSymbol.Style = SimpleMarkerStyle.Circle;
markerSymbol.Size = 6;
markerSymbol.Color = Color.FromRgb((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255));
// Create a renderer
var renderer = new SimpleRenderer();
renderer.Symbol = markerSymbol;
layer.Renderer = renderer;
MapView.Map.Layers.Add(layer);
}
}, TaskScheduler.FromCurrentSynchronizationContext());
}
}
public void TestKMeansClusterAlgorithmWithGeonamesCountryFile()
{
var clusterer = new KMeansClusterer(new EuclideanDistanceCalculator());
var elements = new ClusterPointTextFile(new FileInfo(@"data\aa.txt"), "\t", 4, 3, 1);
const uint expectedClusterCount = 10;
var clusters = clusterer.CreateClusters(elements, expectedClusterCount);
Assert.IsNotNull(clusters, @"The clusters must not be null!");
uint clusterCount = 0;
foreach (var cluster in clusters)
{
clusterCount++;
}
Assert.AreEqual(expectedClusterCount, clusterCount, @"The cluster count was not expected!");
}
