/// <summary>
/// The computer will look for winning moves and block it if there is one.
/// Can only block one winning move seen. If there are two then the player can win.
/// </summary>
/// <returns></returns>
private bool TryBlockWinningMove()
{
TicTacToeGame.TicTacToeToken opponentToken = FindOpponentToken();
if (TryWinningMove(opponentToken))
{
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Highlights the winning move in yellow.
/// </summary>
private void DisplayWinningMove(TicTacToeGame.TicTacToeToken token)
{
for (int index = 0; index < ticTacToeGame.TicTacToeWinPositions.Length; index++)
{
int position = ticTacToeGame.TicTacToeWinPositions[index];
switch (position)
{
case 0:
btnx0y0.Background = Brushes.Yellow;
break;
case 1:
btnx1y0.Background = Brushes.Yellow;
break;
case 2:
btnx2y0.Background = Brushes.Yellow;
break;
case 3:
btnx0y1.Background = Brushes.Yellow;
break;
case 4:
btnx1y1.Background = Brushes.Yellow;
break;
case 5:
btnx2y1.Background = Brushes.Yellow;
break;
case 6:
btnx0y2.Background = Brushes.Yellow;
break;
case 7:
btnx1y2.Background = Brushes.Yellow;
break;
case 8:
btnx2y2.Background = Brushes.Yellow;
break;
default:
throw new InvalidOperationException("DisplayWinningMove method had an unexpected value.");
}
}
}
/// <summary>
/// Computer tries the spot which is adjacent to the player
/// </summary>
/// <returns>True if successful</returns>
private bool TrySpotAdjacentToOpponent()
{
TicTacToeGame.TicTacToeToken opponentToken = FindOpponentToken();
for (int boardPosition = 0; boardPosition < ComputerTicTacToeGame.TicTacToeBoard.Length; boardPosition++)
{
if (ComputerTicTacToeGame.TicTacToeBoard[boardPosition] == opponentToken)
{
// Check to the right of the opponent
if (boardPosition != 8 && ComputerTicTacToeGame.TicTacToeBoard[boardPosition + 1] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(boardPosition + 1);
return(true);
}
// Check the left of the opponent
if (boardPosition != 0 && ComputerTicTacToeGame.TicTacToeBoard[boardPosition - 1] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(boardPosition - 1);
return(true);
}
// Check the below the opponent
if (boardPosition != 6 && boardPosition != 7 && boardPosition != 8 && ComputerTicTacToeGame.TicTacToeBoard[boardPosition + 3] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(boardPosition + 3);
return(true);
}
// Check the above the opponent
if (boardPosition != 0 && boardPosition != 1 && boardPosition != 2 && ComputerTicTacToeGame.TicTacToeBoard[boardPosition - 3] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(boardPosition - 3);
return(true);
}
}
}
return(false);
}
/// <summary>
/// The default constructer needs the game that the computer plays on and the token that it plays
/// </summary>
/// <param name="ticTacToeGame"></param>
/// <param name="ticTacToeToken"></param>
public ComputerPlayer(TicTacToeGame ticTacToeGame, TicTacToeGame.TicTacToeToken ticTacToeToken, MainWindow mainWindow)
{
ComputerTicTacToeGame = ticTacToeGame;
ComputerToken = ticTacToeToken;
ComputerMainWindow = mainWindow;
}
/// <summary>
/// The computer will either make a winning move or block on depending on the token passed
/// Can only block one winning move seen. If there are two then the player can win.
/// </summary>
/// <returns></returns>
private bool TryWinningMove(TicTacToeGame.TicTacToeToken token)
{
// Check top to bottom
if (ComputerTicTacToeGame.TicTacToeBoard[0] == token && ComputerTicTacToeGame.TicTacToeBoard[3] == token && ComputerTicTacToeGame.TicTacToeBoard[6] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(6);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[1] == token && ComputerTicTacToeGame.TicTacToeBoard[4] == token && ComputerTicTacToeGame.TicTacToeBoard[7] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(7);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[2] == token && ComputerTicTacToeGame.TicTacToeBoard[5] == token && ComputerTicTacToeGame.TicTacToeBoard[8] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(8);
return(true);
}
// Check bottom to top
if (ComputerTicTacToeGame.TicTacToeBoard[6] == token && ComputerTicTacToeGame.TicTacToeBoard[3] == token && ComputerTicTacToeGame.TicTacToeBoard[0] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(0);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[7] == token && ComputerTicTacToeGame.TicTacToeBoard[4] == token && ComputerTicTacToeGame.TicTacToeBoard[1] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(1);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[8] == token && ComputerTicTacToeGame.TicTacToeBoard[5] == token && ComputerTicTacToeGame.TicTacToeBoard[2] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(2);
return(true);
}
// Check right to left
if (ComputerTicTacToeGame.TicTacToeBoard[0] == token && ComputerTicTacToeGame.TicTacToeBoard[1] == token && ComputerTicTacToeGame.TicTacToeBoard[2] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(2);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[3] == token && ComputerTicTacToeGame.TicTacToeBoard[4] == token && ComputerTicTacToeGame.TicTacToeBoard[5] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(5);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[6] == token && ComputerTicTacToeGame.TicTacToeBoard[7] == token && ComputerTicTacToeGame.TicTacToeBoard[8] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(8);
return(true);
}
// Check left to right
if (ComputerTicTacToeGame.TicTacToeBoard[2] == token && ComputerTicTacToeGame.TicTacToeBoard[1] == token && ComputerTicTacToeGame.TicTacToeBoard[0] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(0);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[5] == token && ComputerTicTacToeGame.TicTacToeBoard[4] == token && ComputerTicTacToeGame.TicTacToeBoard[3] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(3);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[8] == token && ComputerTicTacToeGame.TicTacToeBoard[7] == token && ComputerTicTacToeGame.TicTacToeBoard[6] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(6);
return(true);
}
// Check diagonal starting from left
if (ComputerTicTacToeGame.TicTacToeBoard[0] == token && ComputerTicTacToeGame.TicTacToeBoard[4] == token && ComputerTicTacToeGame.TicTacToeBoard[8] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(8);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[8] == token && ComputerTicTacToeGame.TicTacToeBoard[4] == token && ComputerTicTacToeGame.TicTacToeBoard[0] == TicTacToeGame.TicTacToeToken.Empty) // from the opposite direction
{
ComputerMainWindow.PlaceTicTacToeToken(0);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[8] == token && ComputerTicTacToeGame.TicTacToeBoard[0] == token && ComputerTicTacToeGame.TicTacToeBoard[4] == TicTacToeGame.TicTacToeToken.Empty) // from the opposite direction
{
ComputerMainWindow.PlaceTicTacToeToken(4);
return(true);
}
// Check diagonal starting from right
if (ComputerTicTacToeGame.TicTacToeBoard[2] == token && ComputerTicTacToeGame.TicTacToeBoard[4] == token && ComputerTicTacToeGame.TicTacToeBoard[6] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(6);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[6] == token && ComputerTicTacToeGame.TicTacToeBoard[4] == token && ComputerTicTacToeGame.TicTacToeBoard[2] == TicTacToeGame.TicTacToeToken.Empty) // from the opposite direction
{
ComputerMainWindow.PlaceTicTacToeToken(2);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[6] == token && ComputerTicTacToeGame.TicTacToeBoard[2] == token && ComputerTicTacToeGame.TicTacToeBoard[4] == TicTacToeGame.TicTacToeToken.Empty) // from the opposite direction
{
ComputerMainWindow.PlaceTicTacToeToken(4);
return(true);
}
// Check the middle sides
if (ComputerTicTacToeGame.TicTacToeBoard[0] == token && ComputerTicTacToeGame.TicTacToeBoard[6] == token && ComputerTicTacToeGame.TicTacToeBoard[3] == TicTacToeGame.TicTacToeToken.Empty)
{
ComputerMainWindow.PlaceTicTacToeToken(3);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[0] == token && ComputerTicTacToeGame.TicTacToeBoard[2] == token && ComputerTicTacToeGame.TicTacToeBoard[1] == TicTacToeGame.TicTacToeToken.Empty) // from the opposite direction
{
ComputerMainWindow.PlaceTicTacToeToken(1);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[2] == token && ComputerTicTacToeGame.TicTacToeBoard[8] == token && ComputerTicTacToeGame.TicTacToeBoard[5] == TicTacToeGame.TicTacToeToken.Empty) // from the opposite direction
{
ComputerMainWindow.PlaceTicTacToeToken(5);
return(true);
}
else if (ComputerTicTacToeGame.TicTacToeBoard[6] == token && ComputerTicTacToeGame.TicTacToeBoard[8] == token && ComputerTicTacToeGame.TicTacToeBoard[5] == TicTacToeGame.TicTacToeToken.Empty) // from the opposite direction
{
ComputerMainWindow.PlaceTicTacToeToken(7);
return(true);
}
return(false);
}
