public override void Clusterize(MapVectorItemCollection sourceItems, MapViewport viewport, bool sourceChanged)
{
if (sourceChanged)
{
currentItems = ClusterizeImpl(sourceItems);
Adapter.OnClustered();
}
}
MapVectorItemCollection ClusterizeImpl(MapVectorItemCollection sourceItems)
{
// Separate localizable and non localizable items.
List <MapItem> nonLocalizableItems = new List <MapItem>();
List <Cluster> clusters = new List <Cluster>();
foreach (MapItem item in sourceItems)
{
ISupportCoordLocation localizableItem = item as ISupportCoordLocation;
if (localizableItem != null)
{
clusters.Add(Cluster.Initialize(localizableItem));
}
else
{
nonLocalizableItems.Add(item);
}
}
// Arrange initial clusters in increasing order of distance to a closest cluster.
clusters = Arrange(clusters);
// Aggregate localizable items.
while (clusters.Count > ClusterCount)
{
MergeCloserstClusters(ref clusters);
}
// Convert internal cluster helpers to Map items.
MapVectorItemCollection clusterRepresentatives = CreateItemsCollection();
for (int i = 0; i < clusters.Count; ++i)
{
Cluster cluster = clusters[i];
MapDot representative = new MapDot()
{
Location = new GeoPoint(cluster.CenterPoint.Y, cluster.CenterPoint.X), Size = 100
};
for (int j = 0; j < cluster.Items.Count; ++j)
{
representative.ClusteredItems.Add(cluster.Items[j] as MapItem);
}
clusterRepresentatives.Add(representative);
}
for (int i = 0; i < nonLocalizableItems.Count; ++i)
{
clusterRepresentatives.Add(nonLocalizableItems[i]);
}
return(clusterRepresentatives);
}