public BitmapImage GetTile(GeometryInfo GeoInfo, int x, int y, int zoom)
{
String key = zoom.ToString() + ',' + x.ToString() + ',' + y.ToString();
if (PreLoadedTiles.ContainsKey(key))
{
// We already have the tile in our cache...
Object TileContent = PreLoadedTiles [key];
if ((TileContent == null)
|| (TileContent.GetType () != typeof (BitmapImage)))
{
BitmapImage Tile = new BitmapImage();
MemoryStream TileStream = new MemoryStream((Byte[])TileContent);
Tile.BeginInit ();
Tile.StreamSource = (MemoryStream)TileStream;
Tile.EndInit ();
lock (PreLoadedTiles)
{
PreLoadedTiles [key] = Tile;
}
}
return (BitmapImage) (PreLoadedTiles[key]);
}
TileDownLoadDescription DownLoadDescription = new TileDownLoadDescription ()
{GeoInfo = GeoInfo, Key = key};
if (GeoInfo.RunTileLoadingSynchron)
{
Download(DownLoadDescription);
if (PreLoadedTiles.ContainsKey(key))
{
// We already have the tile in our cache...
Object TileContent = PreLoadedTiles[key];
if (TileContent.GetType() != typeof(BitmapImage))
{
BitmapImage Tile = new BitmapImage();
MemoryStream TileStream = new MemoryStream((Byte[])TileContent);
Tile.BeginInit();
Tile.StreamSource = (MemoryStream)TileStream;
Tile.EndInit();
lock (PreLoadedTiles)
{
PreLoadedTiles[key] = Tile;
}
}
return (BitmapImage)(PreLoadedTiles[key]);
}
return null;
}
BackgroundWorker DownloadThread = new BackgroundWorker ();
DownloadThread.RunWorkerCompleted += DownloadThread_RunWorkerCompleted;
DownloadThread.DoWork += DownloadThread_DoWork;
DownloadThread.RunWorkerAsync(DownLoadDescription);
return null;
}
private void Download (TileDownLoadDescription DownLoadDescription)
{
try
{
if (DownLoadDescription == null)
return;
//string[] vals = DownLoadDescription.Key.Split(',');
//string url = "http://tile.openstreetmap.org/" + vals[0] + "/" + vals[1] + "/" + vals[2] + ".png";
WebClient Client = new WebClient();
System.IO.Stream TileIOStream = Client.OpenRead(DownLoadDescription.Url);
MemoryStream TileStream = new MemoryStream();
TileIOStream.CopyTo(TileStream);
//BitmapImage tile = new BitmapImage(new Uri(url));
//stream.Flush();
//stream.Close();
if (DownLoadDescription.GeoInfo.RunTileLoadingSynchron)
{
PreLoadedTiles[DownLoadDescription.Key] = TileStream.ToArray();
TileStream.Close();
}
else
{
lock (PreLoadedTiles)
{
PreLoadedTiles[DownLoadDescription.Key] = TileStream.ToArray();
TileStream.Close();
}
}
// TODO: If we've reached the (as yet undefined) limit of how
// many tiles we should be caching, we should remove the least
// recently used one.
if (NewDataAvailable != null)
NewDataAvailable(DownLoadDescription.GeoInfo);
}
catch (Exception)
{
lock (PreLoadedTiles)
{
PreLoadedTiles[DownLoadDescription.Key] = null;
}
if (NewDataAvailable != null)
NewDataAvailable(DownLoadDescription.GeoInfo);
}
finally
{
mDownloadTile = null;
}
}