Beispiel #1
0
        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;
				
            }
Beispiel #2
0
        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;
                }

            }