player vs ai tic-tac-toe game integrated with a gui using minimax algorithm in matlab

main.m
% tic-tac-toe game with minimax algorithm
% Player vs. AI

% Initializing the game board
board = [' ',' ',' '; ' ',' ',' '; ' ',' ',' '];
player = 'X';
winner = '';
depth = 0;

% Create a GUI window for the game board
f = figure('Name','Tic Tac Toe','Units','Normalized','OuterPosition',[0 0.1 0.5 0.8],...
           'MenuBar','none','ToolBar','none','NumberTitle','off');

% Draw game board in GUI
for i=1:3
    for j=1:3
        pos = [0.2+(j-1)*0.2, 0.7-i*0.2, 0.2, 0.2];
        uicontrol('Style','pushbutton','Units','Normalized','Position',pos,...
                  'String',board(i,j),'Fontsize',30,'Callback',{@button_callback,i,j});
    end
end

% Function to respond to button clicks on game board
function button_callback(source,eventdata,i,j)
    % Check if the button has been clicked already
    if source.String~=' '
        return;
    end
    % Update board with player's position
    global board player winner depth;
    board(i,j) = player;
    source.String = player;
    % Switch player for next turn
    if player=='X'
        player = 'O';
    else
        player = 'X';
    end
    depth = depth + 1;
    % Check for winner or tie game
    winner = check_winner(board);
    if winner~=' '
        uialert(source.Parent,winner,'Game Over');
        return;
    elseif depth==9
        uialert(source.Parent,'Tie Game','Game Over');
        return;
    end
    % AI makes move
    board = minimax(board, depth, -1);
    for k=1:3
        for l=1:3
            if board(k,l)~=source.String
                continue;
            end
            uicontrols = source.Parent.Children;
            for m=1:numel(uicontrols)
                if isequal(round(1000*uicontrols(m).Position),round(1000*source.Position+[0,0.020,0,0]))
                    uicontrols(m).String = board(k,l);
                end
            end
        end
    end
    depth = depth + 1;
    % Check for winner or tie game
    winner = check_winner(board);
    if winner~=' '
        uialert(source.Parent,winner,'Game Over');
        return;
    elseif depth==9
        uialert(source.Parent,'Tie Game','Game Over');
        return;
    end
    % Switch player for next turn
    if player=='X'
        player = 'O';
    else
        player = 'X';
    end
end

% Function to check for winner
function winner = check_winner(board)
    winner = ' ';
    % Check rows
    for i=1:3
        if board(i,1)==board(i,2) && board(i,2)==board(i,3) && board(i,1)~=' '
            winner = board(i,1);
            return;
        end
    end
    % Check columns
    for j=1:3
        if board(1,j)==board(2,j) && board(2,j)==board(3,j) && board(1,j)~=' '
            winner = board(1,j);
            return;
        end
    end
    % Check diagonals
    if board(1,1)==board(2,2) && board(2,2)==board(3,3) && board(1,1)~=' '
        winner = board(1,1);
        return;
    elseif board(1,3)==board(2,2) && board(2,2)==board(3,1) && board(1,3)~=' '
        winner = board(1,3);
        return;
    end
end

% Function to calculate best move using Minimax algorithm
function best_move = minimax(board, depth, maximizer)
    scores = zeros(3,3);
    moves = [];
    % Calculate score for each possible move
    for i=1:3
        for j=1:3
            if board(i,j)==' '
                board(i,j) = maximizer == 1 ? 'O' : 'X';
                score = compute_score(board, depth);
                board(i,j) = ' ';
                scores(i,j) = score;
                moves = [moves; [i, j, score]];
            end
        end
    end
    % Find best move
    if maximizer == 1
        max_score = max(scores,[],'all');
        [row,col] = find(scores==max_score,1);
    else
        min_score = min(scores,[],'all');
        [row,col] = find(scores==min_score,1);
    end
    best_move = board;
    best_move(row,col) = maximizer == 1 ? 'O' : 'X';
end

% Function to compute score for Minimax algorithm
function score = compute_score(board, depth)
    winner = check_winner(board);
    if winner == 'O'
        score = 10 - depth;
    elseif winner == 'X'
        score = depth - 10;
    else
        score = 0;
    end
end
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