public bool CheckIsWin(BoardDTO board, BoardCellDTO selectedCell)
{
return(IsWinInBoardRow(board, selectedCell) ||
IsWinInBoardColumn(board, selectedCell) ||
IsWinInBoardDiagonal(board, selectedCell) ||
IsWinInReverseBoardDiagonal(board, selectedCell));
}
private static bool IsWinInBoardDiagonal(BoardDTO board, BoardCellDTO selectedCell)
{
char prevSign = default;
char currSign = default;
var sameSignInRowCount = 0;
for (var adj = 1 - RequiredCellsToWin; adj < RequiredCellsToWin; adj++)
{
var row = selectedCell.Row + adj;
var col = selectedCell.Col + adj;
if (row < 0 || row >= board.Size)
{
continue;
}
if (col < 0 || col >= board.Size)
{
continue;
}
prevSign = currSign;
var cell = board.GetCell(row, col);
if (cell.IsEmpty)
{
continue;
}
currSign = cell.Sign;
if (prevSign != currSign)
{
sameSignInRowCount = 1;
continue;
}
sameSignInRowCount++;
if (sameSignInRowCount == RequiredCellsToWin)
{
for (var i = 0; i < RequiredCellsToWin; i++)
{
board.GetCell(row - i, col - i).IsWinningCell = true;
}
return(true);
}
}
return(false);
}
private static bool IsWinInBoardColumn(BoardDTO board, BoardCellDTO selectedCell)
{
char prevSign = default;
char currSign = default;
int sameSignInRowCount = 0;
var col = selectedCell.Col;
for (var row = selectedCell.Row - RequiredCellsToWin + 1; row < selectedCell.Row + RequiredCellsToWin; row++)
{
if (row < 0 || row >= board.Size)
{
continue;
}
prevSign = currSign;
var cell = board.GetCell(row, col);
if (cell.IsEmpty)
{
continue;
}
currSign = cell.Sign;
if (prevSign != currSign)
{
sameSignInRowCount = 1;
continue;
}
sameSignInRowCount++;
if (sameSignInRowCount == RequiredCellsToWin)
{
var winningCells = board.Cells.Where(c => c.Col == col && c.Row <= row && c.Row > row - RequiredCellsToWin);
foreach (var winningCell in winningCells)
{
winningCell.IsWinningCell = true;
}
return(true);
}
}
return(false);
}