internal void DoProcess(MultiscaleImageViewport state)
{
this.parameters = state;
this.hasParameters = true;
this.processStart = true;
this.processRequest.Set();
}
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);
}
}
}
private static Rect GetImageBounds(double zoom, MultiscaleImageViewport viewport)
{
double imageLeft = -viewport.ActualWidth * viewport.ViewportOrigin.X / viewport.ViewportWidth;
double imageTop = -viewport.ActualWidth * viewport.ViewportOrigin.Y / viewport.ViewportWidth;
double imageWidth = zoom * viewport.TileWidth;
double imageHeight = zoom * viewport.TileHeight;
Rect imageRect = new Rect(0, 0, imageWidth, imageHeight);
Rect viewportRect = new Rect(-imageLeft, -imageTop, viewport.ActualWidth, viewport.ActualHeight);
imageRect.Intersect(viewportRect);
return(imageRect);
}
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 void Arrange()
{
MultiScaleTileSource tileSource = this.multiScaleTileSource;
double internalViewportWidth = (double)this.GetValue(InternalViewportWidthProperty);
if (tileSource != null && !(tileSource is EmptyTileMapSource) && internalViewportWidth > 0)
{
MultiscaleImageViewport state = new MultiscaleImageViewport()
{
ViewportOrigin = this.viewportOrigin,
ViewportWidth = this.viewportWidth,
ActualWidth = this.ActualWidth,
ActualHeight = this.ActualHeight
};
tileSource.ProcessTilesDownload(state);
this.CalculateImageLocation();
this.ArrangeTiles();
}
}
