private bool TryGetTile(TileCoordinates key, out BaseMapTileProxy proxy)
{
// queue new load
if (!_tiles.TryGetValue(key, out proxy))
{
var tile = new BaseMapTileProxy(key)
{
State = BaseMapTileProxy.TileState.Loading, ZoomLevel = zoomLevel
};
_tiles.Add(key, tile);
_loadQueue.Enqueue(tile);
return(false);
}
// requeue failed
if (proxy.State == BaseMapTileProxy.TileState.Failed || proxy.State == BaseMapTileProxy.TileState.Empty)
{
_loadQueue.Enqueue(proxy);
}
return(true);
}
/// <summary>
/// Handle the completion of our map tile download
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void TileDownloadDataCompleted(object sender, DownloadDataCompletedEventArgs e)
{
concurrentDownloads--;
WebClientDownloadState state = null;
try
{
state = (WebClientDownloadState)e.UserState;
BaseMapTileProxy tile = (BaseMapTileProxy)state.Data;
if (e.Cancelled || e.Error != null)
{
var webException = e.Error as WebException;
if (webException != null && webException.Response is System.Net.HttpWebResponse)
{
if ((((System.Net.HttpWebResponse)webException.Response).StatusCode == HttpStatusCode.NotFound))
{
tile.State = BaseMapTileProxy.TileState.NotFound;
}
}
else
{
tile.State = BaseMapTileProxy.TileState.Failed;
}
}
else
{
byte[] InBytes = e.Result;
if (!string.IsNullOrEmpty(MM_Repository.OverallDisplay.MapTileCache))
{
string filename = tile.GetFileName();
if (!Directory.Exists(Path.GetDirectoryName(filename)))
{
Directory.CreateDirectory(Path.GetDirectoryName(filename));
}
File.WriteAllBytes(filename, InBytes);
tile.Bitmap = Surface.RenderTarget2D.LoadBitmapFromFile(filename);
tile.State = BaseMapTileProxy.TileState.Loaded;
}
else
{
using (MemoryStream mS = new MemoryStream(InBytes))
{
var bmp = ((System.Drawing.Bitmap)System.Drawing.Bitmap.FromStream(mS));
tile.Bitmap = bmp.ToDxBitmap(this.Surface.RenderTarget2D);
bmp.Dispose();
tile.State = BaseMapTileProxy.TileState.Loaded;
}
}
}
}
catch (Exception ex)
{
Console.WriteLine("Error retrieving map tile: " + ex.Message);
}
finally
{
if (state != null && state.Client != null)
{
state.Client.Dispose();
}
}
}
