public Collection <TileInfo> GetTiles(BoundingBox boundingBox)
{
var tileWorldUnits = ZoomLevel.Resolution * TileWidth;
Collection <TileInfo> tiles = new Collection <TileInfo>();
var tileRange = new TileRange(-1, -1);
if (TileSchema.IsYAxisReversed)
{
var firstCol = (int)Math.Floor((boundingBox.MinX - TileSchema.MaxExtent.MinX) / tileWorldUnits);
var firstRow = (int)Math.Floor((-boundingBox.MaxY + TileSchema.MaxExtent.MaxY) / tileWorldUnits);
var lastCol = (int)Math.Ceiling((boundingBox.MaxX - TileSchema.MaxExtent.MinX) / tileWorldUnits);
var lastRow = (int)Math.Ceiling((-boundingBox.MinY + TileSchema.MaxExtent.MaxY) / tileWorldUnits);
tileRange = new TileRange(firstCol, firstRow, lastCol - firstCol, lastRow - firstRow);
}
else
{
var firstCol = (int)Math.Floor((boundingBox.MinX - TileSchema.MaxExtent.MinX) / tileWorldUnits);
var firstRow = (int)Math.Floor((boundingBox.MinY - TileSchema.MaxExtent.MaxY) / tileWorldUnits);
var lastCol = (int)Math.Ceiling((boundingBox.MaxX - TileSchema.MaxExtent.MinX) / tileWorldUnits);
var lastRow = (int)Math.Ceiling((boundingBox.MaxY - TileSchema.MaxExtent.MaxY) / tileWorldUnits);
tileRange = new TileRange(firstCol, firstRow, lastCol - firstCol, lastRow - firstRow);
}
for (var x = tileRange.StartColumn; x < tileRange.StartColumn + tileRange.NumberOfColumns; x++)
{
for (var y = tileRange.StartRow; y < tileRange.StartRow + tileRange.NumberOfRows; y++)
{
tiles.Add(new TileInfo(x, y, ZoomLevel.Resolution, TileSchema));
}
}
return(tiles);
}