private static Lines GetConsecutiveLines(Connect4Board b, PieceColor color, int col, Connect4Column move)
{
int horizontal = 1, vertical = 1, mainDiagonal = 1, antiDiagonal = 1;
int nextX, nextY;
for (nextX = col + 1, nextY = move.LastDropRow; nextX < Connect4Board.COLUMNS && b.GetPiece(nextY, nextX) == color; nextX++)
horizontal++;
for (nextX = col - 1; nextX >= 0 && b.GetPiece(nextY, nextX) == color; nextX--)
horizontal++;
for (nextX = col, nextY = move.LastDropRow + 1; nextY < Connect4Board.ROWS && b.GetPiece(nextY, nextX) == color; nextY++)
vertical++;
for (nextX = col, nextY = move.LastDropRow - 1; nextY >= 0 && b.GetPiece(nextY, nextX) == color; nextY--)
vertical++;
for (nextX = col + 1, nextY = move.LastDropRow + 1; nextX < Connect4Board.COLUMNS && nextY < Connect4Board.ROWS && b.GetPiece(nextY, nextX) == color; nextX++, nextY++)
mainDiagonal++;
for (nextX = col - 1, nextY = move.LastDropRow - 1; nextX >= 0 && nextY >= 0 && b.GetPiece(nextY, nextX) == color; nextX--, nextY--)
mainDiagonal++;
for (nextX = col + 1, nextY = move.LastDropRow - 1; nextX < Connect4Board.COLUMNS && nextY >= 0 && b.GetPiece(nextY, nextX) == color; nextX++, nextY--)
antiDiagonal++;
for (nextX = col - 1, nextY = move.LastDropRow + 1; nextX >= 0 && nextY < Connect4Board.ROWS && b.GetPiece(nextY, nextX) == color; nextX--, nextY++)
antiDiagonal++;
return new Lines(horizontal, vertical, mainDiagonal, antiDiagonal);
}
public Connect4Board()
{
columns = new Connect4Column[COLUMNS];
for (int i = 0; i < columns.Length; i++)
columns[i] = new Connect4Column();
turn = Turn.NOT_IN_SESSION;
}
internal static MoveResult CurrentStatus(Connect4Board b, Player p, int col, Connect4Column move)
{
Lines sucessive = GetConsecutiveLines(b, p.Color, col, move);
if (sucessive.horizontal == 4 || sucessive.vertical == 4 || sucessive.mainDiagonal == 4 || sucessive.antiDiagonal == 4)
return MoveResult.FOUR_IN_A_ROW;
for (int i = 0; i < Connect4Board.ROWS; i++)
for (int j = 0; j < Connect4Board.COLUMNS; j++)
if (b.GetPiece(i, j) == PieceColor.EMPTY)
return MoveResult.NORMAL;
return MoveResult.BOARD_FILLED;
}