protected void SelectTiles()
{
var maxZoomLevel = Math.Min(zoomLevel, MaxZoomLevel);
var minZoomLevel = maxZoomLevel;
var container = TileContainer;
if (LoadLowerZoomLevels && container != null && container.Children.IndexOf(this) == 0)
{
minZoomLevel = MinZoomLevel;
}
var newTiles = new List <Tile>();
for (var z = minZoomLevel; z <= maxZoomLevel; z++)
{
var tileSize = 1 << (zoomLevel - z);
var x1 = (int)Math.Floor((double)grid.X / tileSize); // may be negative
var x2 = (grid.X + grid.Width - 1) / tileSize;
var y1 = Math.Max(grid.Y / tileSize, 0);
var y2 = Math.Min((grid.Y + grid.Height - 1) / tileSize, (1 << z) - 1);
for (var y = y1; y <= y2; y++)
{
for (var x = x1; x <= x2; x++)
{
var tile = tiles.FirstOrDefault(t => t.ZoomLevel == z && t.X == x && t.Y == y);
if (tile == null)
{
tile = new Tile(z, x, y);
var equivalentTile = tiles.FirstOrDefault(
t => t.ImageSource != null && t.ZoomLevel == z && t.XIndex == tile.XIndex && t.Y == y);
if (equivalentTile != null)
{
// do not animate to avoid flicker when crossing date line
tile.SetImageSource(equivalentTile.ImageSource, false);
}
}
newTiles.Add(tile);
}
}
}
tiles = newTiles;
}
private void SelectTiles()
{
var maxZoomLevel = Math.Min(zoomLevel, MaxZoomLevel);
var minZoomLevel = maxZoomLevel;
if (LoadLowerZoomLevels && Parent is TileContainer && ((TileContainer)Parent).TileLayers.FirstOrDefault() == this)
{
minZoomLevel = MinZoomLevel;
}
var newTiles = new List<Tile>();
for (var z = minZoomLevel; z <= maxZoomLevel; z++)
{
var tileSize = 1 << (zoomLevel - z);
var x1 = (int)Math.Floor((double)grid.X / tileSize); // may be negative
var x2 = (grid.X + grid.Width - 1) / tileSize;
var y1 = Math.Max(grid.Y / tileSize, 0);
var y2 = Math.Min((grid.Y + grid.Height - 1) / tileSize, (1 << z) - 1);
for (var y = y1; y <= y2; y++)
{
for (var x = x1; x <= x2; x++)
{
var tile = tiles.FirstOrDefault(t => t.ZoomLevel == z && t.X == x && t.Y == y && t.Rotation == rotation);
if (tile == null)
{
tile = new Tile(z, x, y, rotation);
var equivalentTile = tiles.FirstOrDefault(
t => t.Image.Source != null && t.ZoomLevel == z && t.XIndex == tile.XIndex && t.Y == y);
if (equivalentTile != null)
{
// do not animate to avoid flicker when crossing date line
tile.SetImageSource(equivalentTile.Image.Source, false, equivalentTile.Rotation != rotation);
}
}
newTiles.Add(tile);
}
}
}
tiles = newTiles;
}
