private void SetTileSources(Rect imageRect, MultiScaleTileSource source)
{
double tileWidth = this.TileSize.Width * this.scaleFactor;
double tileHeight = this.TileSize.Height * this.scaleFactor;
int startTileX = (int)(imageRect.X / tileWidth);
int startTileY = (int)(imageRect.Y / tileHeight);
int endTileX = (int)Math.Ceiling(imageRect.Right / tileWidth) - 1;
int endTileY = (int)Math.Ceiling(imageRect.Bottom / tileWidth) - 1;
foreach (MapTile tile in this.mainCanvas.Children)
{
int tileX = startTileX + tile.RelativeTileId.X;
int tileY = startTileY + tile.RelativeTileId.Y;
if (tileX > endTileX || tileY > endTileY)
{
if (tile.Source != null)
{
tile.Source = null;
}
continue;
}
TileId tileId = new TileId(this.requestZoomLevel, tileX, tileY);
this.SetTileSource(tile, tileId, source);
}
}
internal void UpdateRequest(TileSource e)
{
if (!this.abort)
{
lock (this.requestsSyncronizer)
{
TileId key = e.TileId;
if (this.requests.ContainsKey(key))
{
TileSource source = this.requests[key];
if (source != null)
{
this.tileCacheSize -= this.requests[key].Size;
}
this.tileCacheSize += e.Size;
this.requests[key] = e;
}
}
this.processStart = true;
ManualResetEvent processManager = this.processRequest;
if (processManager != null)
{
processManager.Set();
}
}
}
internal void RemoveRequest(TileId key)
{
lock (this.requestsSyncronizer)
{
if (this.requests.ContainsKey(key))
{
this.RemoveTile(key);
}
}
}
internal TileDownloader(TileId tileId, Stream stream, Action <TileDownloader> assyncImageReader)
: this(tileId, assyncImageReader)
{
this.tileBodyPart = new byte[TileBodyPartLength];
this.stream = stream;
if (stream.CanSeek)
{
stream.Position = 0;
}
}
/// <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 TileId ReduceTileId(TileId tileId)
{
TileId result = null;
int level = tileId.Level - 1;
if (level > this.zoomLevelShift)
{
result = new TileId(level, tileId.X >> 1, tileId.Y >> 1);
}
return(result);
}
private void RemoveTile(TileId key)
{
TileSource tileSource = this.requests[key];
if (tileSource != null)
{
this.tileCacheSize -= tileSource.Size;
tileSource.Dispose();
}
this.requestList.Remove(key);
this.requests.Remove(key);
}
internal void DownloadTile(TileId tileId)
{
IList <object> objects = null;
using (ManualResetEvent complete = new ManualResetEvent(false))
{
this.Dispatcher.BeginInvoke(new Action(() =>
{
objects = this.GetTileLayers(tileId.Level, tileId.X, tileId.Y);
complete.Set();
}));
complete.WaitOne();
}
if (objects.Count > 0)
{
Uri uri = objects[0] as Uri;
Stream stream = objects[0] as Stream;
if (uri != null)
{
TileDownloadState e = new TileDownloadState()
{
TileId = tileId,
Uri = uri,
Callback = this.AssyncImageCacheReader
};
this.GetCachedTileAsync(tileId.Level, tileId.X, tileId.Y, e.RaiseEvent);
}
else if (stream != null)
{
this.Dispatcher.BeginInvoke(new Action(() =>
{
TileDownloader tile = new TileDownloader(tileId, stream, this.AssyncImageReader);
tile.StartDownload();
}));
}
else
{
TileDownloadState e = new TileDownloadState()
{
TileId = tileId
};
this.UpdateTile(e);
}
}
}
private bool RequestTile(int requestLevel, int tileX, int tileY)
{
TileId key = new TileId(requestLevel, tileX, tileY);
bool download = this.UpdateCachedTile(key);
if (download)
{
MultiScaleTileSource source = this.Source;
if (source != null)
{
source.DownloadTile(key);
}
}
return(download);
}
internal TileSource GetTileSource(TileId tileId)
{
TileSource tileSource = null;
if (!this.abort)
{
lock (this.requestsSyncronizer)
{
if (this.requests.ContainsKey(tileId))
{
tileSource = this.requests[tileId] as TileSource;
}
}
}
return(tileSource);
}
private void SetTileSource(MapTile tile, TileId tileId, MultiScaleTileSource source)
{
bool refresh = false;
if (!tileId.Equals(tile.TileId))
{
tile.TileId = tileId;
refresh = true;
}
while (true)
{
TileSource tileSource = source.GetTileSource(tileId);
if (tileSource != null)
{
if (tile.Source != tileSource || refresh)
{
tile.Source = tileSource;
}
if (tileSource.IsUsed)
{
this.usedTiles.Add(tileSource);
this.unusedTiles.Remove(tileSource);
break;
}
else
{
tileSource = null;
}
}
if (tileSource == null)
{
tileId = this.ReduceTileId(tileId);
if (tileId == null)
{
tile.Source = null;
break;
}
}
}
}
internal bool ValidateTile(TileId tileId)
{
if (!this.abort)
{
MultiscaleImageViewport viewport = this.parameters;
if (viewport.ActualWidth > 0 && viewport.ViewportWidth > 0)
{
int tileZoomLevelShift = (int)Math.Round(Math.Log(viewport.TileWidth, 2));
int tileLevel = tileId.Level - tileZoomLevelShift;
double zoom = viewport.ActualWidth / viewport.TileWidth / viewport.ViewportWidth;
int tileEndLevel = (int)Math.Ceiling(Math.Log(zoom, 2d));
if (tileLevel <= tileEndLevel)
{
double scale = Math.Pow(2d, Math.Log(zoom, 2d) - tileLevel);
MultiScaleTileSource tileSource = this.Source;
if (tileSource != null)
{
double width = tileSource.TileWidth * scale;
double height = tileSource.TileHeight * scale;
double x = tileId.X * width;
double y = tileId.Y * height;
double imageLeft = -viewport.ActualWidth * viewport.ViewportOrigin.X / viewport.ViewportWidth;
double imageTop = -viewport.ActualWidth * viewport.ViewportOrigin.Y / viewport.ViewportWidth;
Rect tileBounds = new Rect(x + imageLeft, y + imageTop, width, height);
Rect imageBounds = new Rect(0, 0, viewport.ActualWidth, viewport.ActualHeight);
imageBounds.Intersect(tileBounds);
if (!imageBounds.IsEmpty)
{
return(true);
}
}
}
}
this.RemoveRequest(tileId);
}
return(false);
}
private bool UpdateCachedTile(TileId key)
{
bool download = false;
lock (this.requestsSyncronizer)
{
if (!this.requests.ContainsKey(key))
{
this.requestList.Add(key);
this.requests.Add(key, null);
download = true;
}
else
{
this.requestList.Remove(key);
this.requestList.Add(key);
}
}
return(download);
}
private void UpdateTileChache()
{
int tilesCounter;
lock (this.requestsSyncronizer)
{
tilesCounter = this.requestList.Count;
}
for (int i = 0;
i < MaxRemovedTiles &&
tilesCounter > this.MinTileNumber &&
this.tileCacheSize > this.MaxTileCacheSize;
i++)
{
lock (this.requestsSyncronizer)
{
TileId removed = this.requestList[0];
TileSource tileSource = this.requests[removed];
if (tileSource != null && !tileSource.IsUsed)
{
this.tileCacheSize -= tileSource.Size;
tileSource.Dispose();
this.requestList.RemoveAt(0);
this.requests.Remove(removed);
}
else
{
this.requestList.Remove(removed);
this.requestList.Add(removed);
break;
}
tilesCounter = this.requestList.Count;
}
}
}
private TileDownloader(TileId tileId, Action <TileDownloader> assyncImageReader)
{
this.imageId = tileId;
this.readerCallback = assyncImageReader;
}
public TileSource(TileId tileId, byte[] imageBody)
{
this.TileId = tileId;
this.body = imageBody;
}
internal TileDownloader(TileId tileId, Uri downloadingUri, Action <TileDownloader> assyncImageReader, ValidateDelegate validator)
: this(tileId, assyncImageReader)
{
this.uri = downloadingUri;
this.validator = validator;
}