Represents a unique TileKey and the area it takes up on screen.
Note, in certain tiling projections, it is possible to have an offset, which represents a tile
which has fully wrapped around, hence this defaults to 0 to simplify usage for projections which
don't require it.
Represents a unique TileKey and the area it takes up on screen.
Note, in certain tiling projections, it is possible to have an offset, which represents a tile which has fully wrapped around, hence this defaults to 0 to simplify usage for projections which don't require it.