public VisualTile(Tile tile, MultiScaleTileSource tileSource)
{
ZIndex = tile.Level;
Scale = 1 / tileSource.ScaleAtLevel(tile.Level);
var position = tileSource.GetTilePosition(tile.Column, tile.Row);
Left = position.X * Scale;
Top = position.Y * Scale;
}
// Note: This uses an int because ZoomableCanvas uses ints to determine visible tiles.
// Even though, you can store an image with more than 45000*45000 tiles on the last level.
// It's possible to overflow this limit with huge sparse images that are close to the
// 4 billion pixel limit from DeepZoom Composer.
internal int GetTileIndex(Tile tile)
{
var rowsAtLevel = RowsAtLevel(tile.Level);
var columnsAtLevel = ColumnsAtLevel(tile.Level);
var levelOffset = LevelOffset(tile.Level);
if (columnsAtLevel > rowsAtLevel)
return levelOffset + columnsAtLevel * tile.Row + tile.Column;
else
return levelOffset + rowsAtLevel * tile.Column + tile.Row;
}
public VisualTile(Tile tile, MultiScaleTileSource tileSource, ImageSource source)
: this(tile, tileSource)
{
Source = source;
}