gistlib - code to run the graphical user interface for a tictactoe game and call the minimax algorithm function in matlab

To run the graphical user interface for a Tic Tac Toe game and call the minimax algorithm function in MATLAB, follow these steps:

Step 1: Create a new MATLAB script and define the game board as a 3x3 matrix. Each cell in the matrix represents a position on the game board.


main.m
gameBoard = zeros(3,3);
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Step 2: Define the GUI using MATLAB's GUIDE (Graphical User Interface Development Environment) tool. Create a new GUI and add the Tic Tac Toe game board to the GUI. You can also add buttons to reset the game, exit the application, and display the winner.

Step 3: Write a function to check for the winner of the game. This function will check each row, column, and diagonal to see if there are three X's or O's in a row.


main.m
function winner = checkWinner(gameBoard)
    % Check rows
    for i = 1:3
        if gameBoard(i,1) == gameBoard(i,2) && gameBoard(i,2) == gameBoard(i,3) && gameBoard(i,1) ~= 0
            winner = gameBoard(i,1);
            return
        end
    end

    % Check columns
    for j = 1:3
        if gameBoard(1,j) == gameBoard(2,j) && gameBoard(2,j) == gameBoard(3,j) && gameBoard(1,j) ~= 0
            winner = gameBoard(1,j);
            return
        end
    end

    % Check diagonals
    if gameBoard(1,1) == gameBoard(2,2) && gameBoard(2,2) == gameBoard(3,3) && gameBoard(1,1) ~= 0
        winner = gameBoard(1,1);
        return
    end

    if gameBoard(1,3) == gameBoard(2,2) && gameBoard(2,2) == gameBoard(3,1) && gameBoard(1,3) ~= 0
        winner = gameBoard(1,3);
        return
    end

    % No winner yet
    winner = 0;
end
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Step 4: Write a function to call the minimax algorithm. The minimax algorithm will calculate the best move for the computer player.


main.m
function [bestMove, bestScore] = minimax(gameBoard, player)
    winner = checkWinner(gameBoard);

    if winner ~= 0
        bestScore = winner * player;
        return
    end

    moves = find(gameBoard == 0);
    scores = zeros(length(moves), 1);

    for i = 1:length(moves)
        move = moves(i);
        [row, col] = ind2sub(size(gameBoard), move);
        gameBoard(row, col) = player;
        [~, score] = minimax(gameBoard, -player);
        scores(i) = score;
        gameBoard(row, col) = 0;
    end

    if player == 1
        [bestScore, bestMoveIndex] = max(scores);
    else
        [bestScore, bestMoveIndex] = min(scores);
    end

    bestMove = moves(bestMoveIndex);
end
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Step 5: Modify the GUI to allow the player to make a move. Use the buttondownfcn callback to register the player's move and call the minimax function to calculate the computer player's move.


main.m
function gameBoardButton1_Callback(hObject, eventdata, handles)
    if handles.gameBoard(1,1) == 0 && handles.currentPlayer == 1
        handles.gameBoard(1,1) = 1;
        hObject.String = 'X';
        hObject.Enable = 'off';
        handles.currentPlayer = -1;

        % Check for winner
        winner = checkWinner(handles.gameBoard);
        if winner ~= 0
            disableAllButtons(handles);
            declareWinner(handles, winner);
            return
        end

        % Computer's turn
        [bestMove, ~] = minimax(handles.gameBoard, -1);
        [row, col] = ind2sub(size(handles.gameBoard), bestMove);
        handles.gameBoard(row, col) = -1;       
        button = findobj('Tag', ['gameBoardButton', num2str(bestMove)]);
        button.String = 'O';
        button.Enable = 'off';

        % Check for winner
        winner = checkWinner(handles.gameBoard);
        if winner ~= 0
            disableAllButtons(handles);
            declareWinner(handles, winner);
            return
        end
    end
end
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Step 6: Run the script and start playing the Tic Tac Toe game on the GUI!

code to run the graphical user interface for a tictactoe game and call the minimax algorithm function in matlab

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