public override void Draw()
{
this.LayerCanvas.Children.Clear();
int[] tiles = GetTileSpanWithin(this.ViewBounds, this.Resolution);
for (int i = tiles[1]; i <= tiles[3]; i++)
{
for (int j = tiles[0]; j <= tiles[2]; j++)
{
string url = GetTileUrl(j, i, this.Resolution);
Tile tile = new Tile();
tile.ColIndex = j;
tile.Resolution = this.Resolution;
tile.RowIndex = i;
tile.Image = new Image() { Source = new BitmapImage(new Uri(url)) };
//double left = ((this.Origin.X + ((TileSize * j) * Resolution)) - this.ViewBounds.LeftBottom.X) / Resolution;
//double top = (ViewBounds.RightTop.Y - (this.Origin.Y - ((TileSize * i) * Resolution))) / Resolution;
// double left = this.Origin.X + ((TileSize * tile.ColIndex) * this.Resolution);
//double top = this.Origin.Y - ((TileSize * tile.RowIndex) * resolution);
double left = this.Origin.X + Resolution * TileSize * tile.ColIndex;
double top = this.Origin.Y - Resolution * TileSize * tile.RowIndex;
double right = left + (this.TileSize * this.Resolution);
double bottom = top - (this.TileSize * this.Resolution);
LayerCanvas.SetExtent(tile.Image, new Rectangle2D(left, bottom, right, top));
//tile.Image.SetValue(Canvas.LeftProperty, left);
//tile.Image.SetValue(Canvas.TopProperty, top);
this.LayerCanvas.Children.Add(tile.Image);
}
}
}
private void AddTile(Tile tile)
{
if (!string.IsNullOrEmpty(tile.Url))
{
BitmapImage bitmapImage = new BitmapImage()
{
UriSource = new Uri(tile.Url, UriKind.Absolute)
};
EventHandler<DownloadProgressEventArgs> onProgressEventHandler = null;
onProgressEventHandler = delegate(object sender, DownloadProgressEventArgs e)
{
//this.bmi_DownloadProgress(sender, e, tile, onProgressEventHandler);
};
bitmapImage.DownloadProgress += onProgressEventHandler;
tile.Image = new Image
{
Opacity = 0.0,
Tag = tile,
IsHitTestVisible = false,
// Name = uniqueLayerId + tile.TileKey,
Stretch = Stretch.Fill,
Source = bitmapImage
};
double resolution = tile.Resolution;
//orginX originY
double left = this.Origin.X + ((TileSize * tile.ColIndex) * resolution);
double top = this.Origin.Y - ((TileSize * tile.RowIndex) * resolution);
double right = left + (this.TileSize * resolution);
double bottom = top - (this.TileSize * resolution);
LayerCanvas.SetExtent(tile.Image, new Rectangle2D(left, bottom, right, top));//计算该image的范围
tile.Image.ImageOpened += delegate(object o, RoutedEventArgs e)
{
if (base.Dispatcher.CheckAccess())
{
Action a = delegate
{
//this.RaiseTileLoad(tile, new Rectangle2D(left, bottom, right, top));
};
this.Dispatcher.BeginInvoke(a);
}
else
{
//this.RaiseTileLoad(tile, new Rectangle2D(left, bottom, right, top));
}
};
//pendingTiles.Add(tile.Url, tile);
base.LayerCanvas.Children.Add(tile.Image);
}
}