/// <summary>
/// Constructs a new instance of TileRef.
/// </summary>
/// <param name="mapId">Identifier of the map this tile belongs to.</param>
/// <param name="gridId">Identifier of the grid this tile belongs to.</param>
/// <param name="gridIndices">Positional indices of this tile on the grid.</param>
/// <param name="tile">Actual data of this tile.</param>
internal TileRef(MapId mapId, GridId gridId, MapIndices gridIndices, Tile tile)
{
MapIndex = mapId;
GridIndex = gridId;
GridIndices = gridIndices;
Tile = tile;
}
/// <inheritdoc />
public MapIndices GridTileToChunkTile(MapIndices gridTile)
{
var size = ChunkSize;
var x = MathHelper.Mod(gridTile.X, size);
var y = MathHelper.Mod(gridTile.Y, size);
return(new MapIndices(x, y));
}
/// <summary>
/// Constructs an instance of a MapGrid chunk.
/// </summary>
/// <param name="grid"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="chunkSize"></param>
public MapChunk(IMapGridInternal grid, int x, int y, ushort chunkSize)
{
_grid = grid;
LastModifiedTick = grid.CurTick;
_gridIndices = new MapIndices(x, y);
ChunkSize = chunkSize;
_tiles = new Tile[ChunkSize, ChunkSize];
_snapGrid = new SnapGridCell[ChunkSize, ChunkSize];
}
/// <inheritdoc />
public TileRef GetTileRef(MapIndices indices)
{
if (indices.X >= ChunkSize || indices.X < 0 || indices.Y >= ChunkSize || indices.Y < 0)
{
throw new ArgumentOutOfRangeException(nameof(indices), "Tile indices out of bounds.");
}
var chunkIndices = ChunkTileToGridTile(indices);
return(new TileRef(_grid.ParentMapId, _grid.Index, chunkIndices, _tiles[indices.X, indices.Y]));
}
/// <inheritdoc />
public MapIndices ChunkTileToGridTile(MapIndices chunkTile)
{
return(chunkTile + _gridIndices * ChunkSize);
}