internal void SetMinTileNumber(int tilesCount)
{
int minNumber = 0;
int counter = tilesCount;
for (int i = this.LevelCount; i > 0; i--)
{
minNumber += counter;
counter /= 2;
if (counter < 4)
{
minNumber += 4 * i;
break;
}
}
this.minTileNumber = minNumber + 1;
TilesDownloadManager downloader = this.downloadManager;
if (downloader != null)
{
downloader.MinTileNumber = this.minTileNumber;
}
}
private void Process()
{
MultiscaleImageViewport viewport = this.parameters;
if (viewport.ActualWidth > 0 && viewport.ViewportWidth > 0)
{
this.zoomLevelShift = (int)Math.Round(Math.Log(viewport.TileWidth, 2));
double zoom = viewport.ActualWidth / viewport.TileWidth / viewport.ViewportWidth;
double zoomLevel = Math.Log(zoom, 2d);
double currentZoom = Math.Round(zoomLevel);
double scaleFactor = Math.Pow(2, zoomLevel - currentZoom);
double tileWidth = viewport.TileWidth * scaleFactor;
double tileHeight = viewport.TileHeight * scaleFactor;
Rect imageRect = TilesDownloadManager.GetImageBounds(zoom, viewport);
if (!imageRect.IsEmpty)
{
this.endLevel = (int)Math.Ceiling(Math.Log(zoom, 2d));
this.startTileX = (int)(imageRect.X / tileWidth);
this.startTileY = (int)(imageRect.Y / tileHeight);
this.endTileX = (int)Math.Ceiling(imageRect.Right / tileWidth) - 1;
this.endTileY = (int)Math.Ceiling(imageRect.Bottom / tileHeight) - 1;
int endLevel3 = this.endLevel - 2;
endLevel3 = endLevel3 >= 0 ? endLevel3 : 0;
this.RequestTop3Levels(endLevel3);
this.RequestOtherLevels(endLevel3);
this.UpdateTileChache();
}
}
}
internal void ProcessTilesDownload(MultiscaleImageViewport state)
{
if (!(this is EmptyTileMapSource))
{
TilesDownloadManager manager = null;
if (this.downloadManager == null)
{
TilesDownloadManager downloader = new TilesDownloadManager(this);
downloader.MaxTileCacheSize = this.maxTileCacheSize;
downloader.MinTileNumber = this.minTileNumber;
this.downloadManager = downloader;
downloader.StartDownload();
}
manager = this.downloadManager;
state.TileWidth = this.tileWidth;
state.TileHeight = this.tileHeight;
if (manager != null)
{
manager.DoProcess(state);
}
}
}
internal void StopDownload()
{
TilesDownloadManager manager = this.downloadManager;
if (manager != null)
{
this.downloadManager = null;
manager.StopDownload();
}
}
/// <summary>
/// Sets maximal size of tile cache.
/// </summary>
/// <param name="bytes">The size in bytes.</param>
public void SetTileCacheSize(int bytes)
{
this.maxTileCacheSize = bytes;
TilesDownloadManager downloader = this.downloadManager;
if (downloader != null)
{
downloader.MaxTileCacheSize = this.maxTileCacheSize;
}
}
/// <summary>
/// Invalidates specified tile layers.
/// </summary>
/// <param name="tileLevel">Tile level.</param>
/// <param name="tilePositionX">X position of the tile.</param>
/// <param name="tilePositionY">Y position of the tile.</param>
/// <param name="tileLayer">Layer of the tile.</param>
public virtual void InvalidateTileLayer(int tileLevel, int tilePositionX, int tilePositionY, int tileLayer)
{
TilesDownloadManager manager = this.downloadManager;
if (manager != null)
{
TileId tileId = new TileId(tileLevel, tilePositionX, tilePositionY);
manager.RemoveRequest(tileId);
manager.Refresh();
}
}
internal TileSource GetTileSource(TileId tileId)
{
TileSource tileSource = null;
TilesDownloadManager manager = this.downloadManager;
if (manager != null)
{
tileSource = manager.GetTileSource(tileId);
}
return(tileSource);
}
private void UpdateTile(TileDownloadState e)
{
TilesDownloadManager manager = this.downloadManager;
if (manager != null)
{
TileSource tileSource = new TileSource(e.TileId, e.TileBody);
manager.UpdateRequest(tileSource);
if (e.TileBody != null && manager.ValidateTile(e.TileId))
{
this.OnTileAvailable();
}
e.Dispose();
}
}
private void AssyncImageCacheReader(TileDownloadState e)
{
TilesDownloadManager manager = this.downloadManager;
if (manager != null)
{
if (e.TileBody == null)
{
TileDownloader downloader = new TileDownloader(e.TileId, e.Uri, this.AssyncImageReader, manager.ValidateTile);
downloader.StartDownload(this.RequestCacheLevel, this.RequestCredentials, this.HttpUnauthorizedHandler);
}
else
{
this.UpdateTile(e);
}
}
}
