/// <summary>
/// Removes an image from tile list
/// </summary>
/// <param name="tileInfo">Image to be removed</param>
private void RemoveImage(TileInfo tileInfo)
{
var animation = new DoubleAnimation();
animation.From = 1.0;
animation.To = 0.0;
animation.Duration = TimeSpan.FromSeconds(0.1);
var storyboard = new Storyboard();
storyboard.Children.Add(animation);
Storyboard.SetTarget(storyboard, tileInfo.TileImage);
Storyboard.SetTargetProperty(storyboard, "Image.Opacity");
storyboard.Begin();
storyboard.Completed += (x, y) =>
{
this.Children.Remove(tileInfo.TileImage);
this.notLoadedTiles.Remove(tileInfo);
this.addedTiles.Remove(tileInfo);
};
}
private void UpdateTile(TileInfo tileInfo)
{
if ((tileInfo.Zoom > (this.CurrentZoomLevel + 1))
|| (tileInfo.Zoom < (this.CurrentZoomLevel - 2)))
{
// Hide unused images
this.RemoveImage(tileInfo);
}
var zoom = this.CurrentZoomLevel;
var localZoom = Math.Pow(2, zoom);
localZoom = Math.Pow(2, tileInfo.Zoom);
var position = tileInfo.GetCoordinates(localZoom);
Canvas.SetLeft(
tileInfo.TileImage,
(position.X + this.CurrentPosition.X)
* this.CurrentZoom * BaseZoom
+ this.ActualWidth / 2);
Canvas.SetTop(
tileInfo.TileImage,
(position.Y + this.CurrentPosition.Y)
* this.CurrentZoom * BaseZoom
+ this.ActualHeight / 2);
tileInfo.TileImage.Width = (this.CurrentZoom / localZoom) + 0.5;
tileInfo.TileImage.Height = (this.CurrentZoom / localZoom) + 0.5;
}
/// <summary>
/// Shows a specific tile
/// </summary>
/// <param name="tileX">X-Coordinate of tile</param>
/// <param name="tileY">Y-Coordinate of tile</param>
/// <param name="zoom">Zoomlevel of tile</param>
/// <param name="visible">Flag whether tiles are visible</param>
protected TileInfo ShowTile(int tileX, int tileY, int zoom)
{
// Shows if shown tile is in loadedtiles
var found = this.addedTiles.FirstOrDefault(
x => x.TileX == tileX && x.TileY == tileY && x.Zoom == zoom);
if (found != null)
{
if (found.TileImage != null)
{
if (zoom <= this.CurrentZoom &&
found.TileImage.Visibility == Windows.UI.Xaml.Visibility.Collapsed)
{
// Switch visibility flag
found.TileImage.Visibility = Windows.UI.Xaml.Visibility.Visible;
}
}
// Already loaded
return found;
}
// Creates images if necessary
var tileInfo = new TileInfo();
tileInfo.TileX = tileX;
tileInfo.TileY = tileY;
tileInfo.Zoom = zoom;
this.addedTiles.Add(tileInfo);
this.notLoadedTiles.Add(tileInfo);
this.TilesRetrieved++;
return tileInfo;
}
