/// <summary>
/// Creates and initializes an instance of MapRectangleByTile.
/// </summary>
/// <param name="x">X-coordinate of the tile</param>
/// <param name="y">Y-coordinate of the tile</param>
/// <param name="z">Z-coordinate of the tile</param>
public TileMapRectangle(int x, int y, int z)
{
var rect = ReprojectionProvider.TileToSphereMercator(X = x, Y = y, Z = z, 6371000);
West = Math.Min(rect.Left, rect.Right);
East = Math.Max(rect.Left, rect.Right);
North = Math.Max(rect.Top, rect.Bottom);
South = Math.Min(rect.Top, rect.Bottom);
}
/// <inheritdoc/>
public Stream GetImageStream(int x, int y, int zoom)
{
// get tile bounds in mercator units
var rect = ReprojectionProvider.TileToSphereMercator(x, y, zoom, 6371000);
var mapRect = new Tools.Reprojection.MapRectangle(rect.Left, rect.Bottom, rect.Right, rect.Top);
// Request the map tile from the ReprojectionService. The returned image stream may be
// null, e.g. when the requested tile is out of bounds regarding the inner MapServer configuration.
// In that case return a default tile preventing the map from displaying enlarged images from other
// zoom levels (> avoids "zoom artifacts").
return((ReprojectionService.GetImageStream(mapRect, new Size(256, 256)) ?? new MemoryStream(defaultTile)).Reset());
}
