/// <summary>
/// A MapLayer that clusters a set of data based on the current map view and zoom level.
/// This offers increased performance and a better user experience when rendering thousands of pushpins on a map.
/// </summary>
#if WINDOWS_PHONE_APP
public ClusteringLayer(MapControl map)
{
_map = map;
_items = new ItemLocationCollection();
_items.CollectionChanged += () =>
{
_allLocations.Clear();
foreach (var i in _items)
{
_allLocations.Add(i.Location);
}
Cluster();
};
_allLocations = new List <Geopoint>();
this.Unloaded += (s, e) =>
{
if (_map != null)
{
_map.ZoomLevelChanged -= _map_ViewChangeEnded;
_map.CenterChanged -= _map_ViewChangeEnded;
_map.SizeChanged -= _map_SizeChanged;
}
};
Init();
}
public ClusteringLayer(Map map)
{
_map = map;
_items = new ItemLocationCollection();
_items.CollectionChanged += () =>
{
_allLocations.Clear();
foreach (var i in _items)
{
_allLocations.Add(i.Location);
}
Cluster();
};
_allLocations = new GeoCoordinateCollection();
this.Unloaded += (s, e) =>
{
if (_map != null)
{
_map.ViewChanged -= _map_ViewChangeEnded;
_map.SizeChanged -= _map_SizeChanged;
}
};
}
/// <summary>
/// Adds a range of ItemLocation's to the collection.
/// This is more effienciet that adding item's individually
/// as the CollectionChanged event will only be fired once.
/// </summary>
/// <param name="items"></param>
public void AddRange(ItemLocationCollection items)
{
base.AddRange(items);
if (CollectionChanged != null)
{
CollectionChanged();
}
}
/// <summary>
/// Inserts a collection of locations at a specified index.
/// </summary>
/// <param name="index">Index to insert items at.</param>
/// <param name="items">Collection of items to add.</param>
public void InsertRange(int index, ItemLocationCollection items)
{
base.InsertRange(index, items);
if (CollectionChanged != null)
{
CollectionChanged();
}
}
/// <summary>
/// Gets a collection of items for a list of indicies.
/// </summary>
/// <param name="index">List of indicies.</param>
/// <returns>Collection of items.</returns>
public ItemLocationCollection GetItemsByIndex(List <int> index)
{
var items = new ItemLocationCollection();
foreach (var i in index)
{
if (i < this.Count)
{
items.Add(this[i]);
}
}
return(items);
}
public ClusteringLayer()
{
_items = new ItemLocationCollection();
_items.CollectionChanged += () =>
{
_allLocations.Clear();
foreach (var i in _items)
{
_allLocations.Add(i.Location);
}
Cluster();
};
_allLocations = new LocationCollection();
this.Loaded += (s, e) =>
{
DependencyObject parent = this;
while (parent != null && !(parent is Map))
{
parent = VisualTreeHelper.GetParent(parent);
if (parent is MapLayer)
{
_parentLayer = parent as MapLayer;
}
}
if (parent != null && _parentLayer != null)
{
_map = parent as Map;
Init();
}
};
this.Unloaded += (s, e) =>
{
if (_map != null)
{
#if WINDOWS_APP
_map.ViewChangeEnded -= _map_ViewChangeEnded;
#elif WPF
_map.ViewChangeEnd -= _map_ViewChangeEnded;
#endif
_map.SizeChanged -= _map_SizeChanged;
}
};
}
