/// <summary>
/// checks for adjacent tiles, and sends them onward in a List of Tiles.
/// </summary>
/// <param name="tile">(Tile) The newly placed tile / "connector tile".</param>
/// <returns>(List of Tile) A list of adjacent tiles, possibly empty. </returns>
private List <Tile> getAdjacentTiles(Tile tile)
{
// checks for edge cases.
List <Tile> adjacents = new List <Tile>();
Tuple <int, int> pos = convertPositionToGrid(tile.getPosition());
int row = pos.Item1;
int col = pos.Item2;
if (row != 0)//find top tile
{
// if the tile has been placed...
if (board[row - 1, col] != null)
{
adjacents.Add(board[row - 1, col]);
}
}
if (row != Board.MAX_ROWS - 1)//find bottom tile
{
// if the tile has been placed...
if (board[row + 1, col] != null)
{
adjacents.Add(board[row + 1, col]);
}
}
if (col != 0)//find left tile
{
// if the tile has been placed...
if (board[row, col - 1] != null)
{
adjacents.Add(board[row, col - 1]);
}
}
if (col != Board.MAX_COLUMNS - 1)//find right tile
{
// if the tile has been placed...
if (board[row, col + 1] != null)
{
adjacents.Add(board[row, col + 1]);
}
}
// Returns a possibly empty List
return(adjacents);
}
/// <summary>
/// Plays the tile on the board. It may cause several different events to occur.
/// </summary>
/// <param name="tile">The tile object to play.</param>
/// <returns>TileIntersection: object containing surrounding tiles, or null if there were no surrounding tiles.</returns>
public TileIntersection playTile(Tile tile)
{
// Get row and column on the board grid
var tuple = this.convertPositionToGrid(tile.getPosition());
// Put the tile on the board
board[tuple.Item1, tuple.Item2] = tile;
// Forms a corporation, if possible.
List <Tile> adjTiles = getAdjacentTiles(tile);
if (adjTiles.Count > 0)
{
TileIntersectionFactory factory = new TileIntersectionFactory();
return(factory.determineIntersection(tile, adjTiles));
}
return(null);
}