public virtual BoardStatus? CheckForWinner(IBoardCells boardCells)
{
foreach (var combination in _winningCombinations)
{
var firstCell = boardCells.GetCell(combination[0]);
//if one cell of the combination is empty, it can't be part of a winning combination - move on
if (firstCell == PieceType.Neither) continue;
//if all three cells have the same non-empty value, we have a winner
if (
boardCells.GetCell(combination[1]) == firstCell
&&
boardCells.GetCell(combination[2]) == firstCell
)
{
return firstCell == PieceType.Nought
? BoardStatus.NoughtsWins
: BoardStatus.CrossesWins;
}
}
//no winning combination found
return null;
}
public virtual BoardStatus?CheckForWinner(IBoardCells boardCells)
{
foreach (var combination in _winningCombinations)
{
var firstCell = boardCells.GetCell(combination[0]);
//if one cell of the combination is empty, it can't be part of a winning combination - move on
if (firstCell == PieceType.Neither)
{
continue;
}
//if all three cells have the same non-empty value, we have a winner
if (
boardCells.GetCell(combination[1]) == firstCell
&&
boardCells.GetCell(combination[2]) == firstCell
)
{
return(firstCell == PieceType.Nought
? BoardStatus.NoughtsWins
: BoardStatus.CrossesWins);
}
}
//no winning combination found
return(null);
}
/// <summary>
/// Allow the placing of a piece on the board, subject to certain conditions. It then uses
/// both IBoardWinningRules and IBoardCells to work out the current state of the board
/// </summary>
/// <param name="piece">Type of piece to place on board - Nought or Cross</param>
/// <returns>State of the board after applyin the piece - either having a winner (and which one), full or still playable</returns>
public BoardStatus AssignPieceToBoard(PieceType piece)
{
if (_boardCells.NoSpacesLeft())
{
throw new Exception("You can't assign a piece to a full board");
}
int randomIndex;
while (true)
{
randomIndex = _random.Next(_boardSize);
if (_boardCells.GetCell(randomIndex) == PieceType.Neither)
{
break;
}
}
_boardCells.SetCell(randomIndex, piece);
var winner = _boardWinningRules.CheckForWinner(_boardCells);
if (winner.HasValue)
{
return(winner.Value);
}
if (_boardCells.NoSpacesLeft())
{
return(BoardStatus.Full);
}
return(BoardStatus.StillPlayable);
}
public string RenderAsText(IBoardCells boardCells)
{
Func <int, char> cell = x => _renderLookup[boardCells.GetCell(x)];
return(string.Format(
" {0} | {1} | {2} \n" +
"-----------\n" +
" {3} | {4} | {5} \n" +
"-----------\n" +
" {6} | {7} | {8} \n",
cell(0), cell(1), cell(2),
cell(3), cell(4), cell(5),
cell(6), cell(7), cell(8)
));
}
public string RenderAsText(IBoardCells boardCells)
{
Func<int, char> cell = x => _renderLookup[boardCells.GetCell(x)];
return string.Format(
" {0} | {1} | {2} \n" +
"-----------\n" +
" {3} | {4} | {5} \n" +
"-----------\n" +
" {6} | {7} | {8} \n",
cell(0), cell(1), cell(2),
cell(3), cell(4), cell(5),
cell(6), cell(7), cell(8)
);
}
