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snake_gui.m
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snake_gui.m
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% Phillip Ngo
% Classic Snake Game
function snake_gui(command_str)
if nargin < 1
command_str = 'initialize';
end
%% Initialize GUI
if strcmp(command_str, 'initialize')
clear, close all
%% Initial Settings
handles.snakeColor = 'black';
handles.pointColor = 'black';
handles.wallColor = 'black';
handles.baseSpeed = .06;
handles.speed = handles.baseSpeed;
handles.markerSize = 30;
handles.walls = true;
%% Create Figure
screensize = get(0, 'screensize');
screensize = screensize(3:4);
figureX = 960; %% change this value to change gui size. keep same X/Y ratio
figureY = 700; %% change this value to change gui size. keep same X/Y ratio
fig = figure( ...
'position', [(screensize(1)-figureX)/2 ...
(screensize(2)-figureY)/2 ...
figureX figureY], ...
'name','Snake', ...
'visible', 'off', ...
'MenuBar','none', ...
'color', [0.5625 0.9297 0.5625], ...
'resize', 'off');
%% Create Axes
handles.axes = axes( ...
'units', 'pixels', ...
'position', [5 5 figureY-10 figureY-10]);
plot([-10 10 10 -10 -10], [-10 -10 10 10 -10], 'k-', 'LineWidth', 10, 'Color', handles.wallColor)
%% Create Title and Author Texts
titleText = uicontrol(fig, ...
'style', 'text', ...
'position', [figureX - 230 figureY - 105 ...
195 100], ...
'string', 'Snake', ...
'fontsize', 50, ...
'fontangle', 'italic', ...
'backgroundcolor', [0.5625 0.9297 0.5625]);
authorText = uicontrol(fig, ...
'style', 'text', ...
'position', [figureX-80 -80 ...
100 100], ...
'string', 'Phillip Ngo', ...
'fontangle', 'italic', ...
'fontsize', 8, ...
'backgroundcolor', [0.5625 0.9297 0.5625]);
%% Create Play Button
handles.playButton = uicontrol(fig, ...
'Style', 'pushbutton', ...
'position', [figureX/1.33 5+figureX/1.6-75 ...
215 75], ...
'string', 'Play!', ...
'fontsize', 30, ...
'callback', 'snake_gui(''play'')');
%% Create Themes DropDown and Text
handles.themesMenu = uicontrol(fig, ...
'Style', 'popupmenu', ...
'position', [figureX/1.33 figureY-725 ...
215 75], ...
'String', {'Jungle' ...
'Galactic' ...
'Hello Kitty' ...
'Fire' ...
'Sky'}, ...
'fontsize', 12, ...
'callback', 'snake_gui(''themes'')');
themesText = uicontrol(fig, ...
'Style', 'text', ...
'position', [figureX/1.33 figureY-650 ...
100 30], ...
'backgroundcolor', [0.5625 0.9297 0.5625], ...
'String', 'Themes:', ...
'fontsize', 18);
%% Create Difficulty Dropdown and Text
handles.difficultyMenu = uicontrol(fig, ...
'Style', 'popupmenu', ...
'position', [figureX/1.33 figureY-400 ...
215 75], ...
'String', {'Slow' ...
'Normal' ...
'Fast' ...
'Extreme'}, ...
'Value', 2, ...
'fontsize', 12, ...
'callback', 'snake_gui(''speed'')');
difficultyText = uicontrol(fig, ...
'Style', 'text', ...
'position', [figureX/1.33 figureY-325 ...
100 30], ...
'backgroundcolor', [0.5625 0.9297 0.5625], ...
'String', 'Difficulty:', ...
'fontangle', 'italic', ...
'fontsize', 18);
%% Create 'Large Board' Checkbox
handles.largeBoard = uicontrol(fig, ...
'Style', 'checkbox', ...
'Position', [figureX/1.33 figureY-385 ...
100 30], ...
'String', 'Large Board', ...
'BackgroundColor', [0.5625 0.9297 0.5625], ...
'fontsize', 10, ...
'callback', 'snake_gui(''large board'')');
%% Create 'No Walls' Checkbox
handles.noWalls = uicontrol(fig, ...
'Style', 'checkbox', ...
'Position', [figureX/1.15 figureY-385 ...
100 30], ...
'String', 'No Walls', ...
'BackgroundColor', [0.5625 0.9297 0.5625], ...
'fontsize', 10, ...
'callback', 'snake_gui(''no walls'')');
%% Create Length Title and Text
handles.lengthText = uicontrol(fig, ...
'Style', 'text', ...
'Position', [figureX/1.23 figureY-230 ...
100 40], ...
'String', '-', ...
'BackgroundColor', [0.5625 0.9297 0.5625], ...
'fontsize', 30);
lengthTitle = uicontrol(fig, ...
'Style', 'text', ...
'Position', [figureX/1.23 figureY-275 ...
100 35], ...
'String', 'Length', ...
'BackgroundColor', [0.5625 0.9297 0.5625], ...
'fontsize', 20);
%% Create Array of Static Texts and Color Variables
handles.staticTexts = [titleText authorText themesText difficultyText handles.largeBoard ...
handles.lengthText lengthTitle handles.noWalls];
%% Save handles and make GUI visible
set(fig, 'userdata', handles)
set(fig, 'visible', 'on')
%% Play Callback
elseif strcmp(command_str, 'play')
hold on
snake = [0 0];
set(gcf,'CurrentCharacter', 'i')
direction = 'i';
gameover = false;
point = randomPoint(snake);
%time = []; % for testing loop spped
while (~gameover)
%tic % for testing loop speed
cla
handles = get(gcf, 'userdata');
set(handles.lengthText, 'String', num2str(length(snake(:, 1))));
plot(snake(:, 1), snake(:, 2), 'ks', 'markersize', handles.markerSize, 'linewidth', 2, 'color', handles.snakeColor)
plot(point(1), point(2), 'ks', 'markersize', handles.markerSize, 'linewidth', 2, 'color', handles.pointColor)
plot([-10 10 10 -10 -10], [-10 -10 10 10 -10], 'k-', 'LineWidth', 10, 'Color', handles.wallColor)
if checkCollision(snake, point)
point = randomPoint(snake);
snake = growSnake(snake);
end
direction = getDirection(snake, direction);
snake = move(snake, direction);
gameover = gamestate(snake);
pause(handles.speed)
if isempty(findall(0, 'Type', 'Figure')) % exits loop if user closes the GUI
break;
end
%time(length(time)+1) = toc; % for testing loop speed
end
%sum(time)/length(time) % the average time for one loop
%% Themes Callback
elseif strcmp(command_str, 'themes')
handles = get(gcf, 'userdata');
theme = get(handles.themesMenu, 'String');
theme = theme(get(handles.themesMenu, 'Value'));
switch theme{1}
case 'Jungle'
figureColor = [0.5625 0.9297 0.5625];
axesColor = [0.8750 1.0000 1.0000];
textColor = 'black';
handles.snakeColor = 'black';
handles.pointColor = 'black';
handles.wallColor = 'black';
case 'Galactic'
figureColor = 'black';
axesColor = 'black';
textColor = 'green';
handles.snakeColor = 'red';
handles.pointColor = 'blue';
handles.wallColor = 'green';
case 'Hello Kitty'
figureColor = [1 .4102 .7031];
axesColor = [0.9 0.9 0.9792];
textColor = 'yellow';
handles.snakeColor = [1 0 1];
handles.pointColor = [0.8594 0.0781 0.2344];
handles.wallColor = 'yellow';
case 'Fire'
figureColor = [0.4500 0 0];
axesColor = [.5430 0 0];
textColor = [1 .5469 0];
handles.snakeColor = [1 .2695 0];
handles.pointColor = 'red';
handles.wallColor = [1 .5469 0];
case 'Sky'
figureColor = [.1172 .5625 1];
axesColor = [0.5273 0.8047 0.9180];
textColor = 'white';
handles.snakeColor = [0 0 .8008];
handles.pointColor = [0 0 .8008];
handles.wallColor = 'white';
end
for i = 1:length(handles.staticTexts)
set(handles.staticTexts(i), 'BackgroundColor', figureColor, ...
'ForegroundColor', textColor);
end
set(gcf, 'color', figureColor)
plot([-10 10 10 -10 -10], [-10 -10 10 10 -10], 'k-', 'LineWidth', 10, 'Color', handles.wallColor)
set(handles.axes, 'color', axesColor)
set(gcf, 'userdata', handles)
%% Difficulty Menu Callback
elseif strcmp(command_str, 'speed')
handles = get(gcf, 'userdata');
theme = get(handles.difficultyMenu, 'String');
theme = theme(get(handles.difficultyMenu, 'Value'));
switch theme{1}
case 'Slow'
handles.speed = handles.baseSpeed + .02;
case 'Normal'
handles.speed = handles.baseSpeed;
case 'Fast'
handles.speed = handles.baseSpeed - .02;
case 'Extreme'
handles.speed = handles.baseSpeed - .03;
end
set(gcf, 'userdata', handles)
%% Large Board Callback
elseif strcmp(command_str, 'large board')
handles = get(gcf, 'userdata');
if get(handles.largeBoard, 'value') == 1
handles.baseSpeed = .04;
handles.markerSize = 15;
else
handles.baseSpeed = .06;
handles.markerSize = 30;
end
set(gcf, 'userdata', handles);
%% No Walls Callback
elseif strcmp(command_str, 'no walls')
handles = get(gcf, 'userdata');
handles.walls = ~handles.walls;
set(gcf, 'userdata', handles)
end % End of GUI initialization and callbacks
%%% PLAY METHODS - Helper Methods for Play Callback
%% moves the snake in the given direction
function snake = move(snake, direction)
handles = get(gcf, 'userdata');
if get(handles.largeBoard, 'Value') == 1
increment = .5;
else
increment = 1;
end
if length(snake(:,1)) ~= 1
for i = length(snake(:,1)):-1:2
snake(i, 1) = snake(i-1, 1);
snake(i, 2) = snake(i-1, 2);
end
end
switch direction
case 30
snake(1, 2) = snake(1, 2) + increment;
case 28
snake(1, 1) = snake(1, 1) - increment;
case 31
snake(1, 2) = snake(1, 2) - increment;
case 29
snake(1, 1) = snake(1, 1) + increment;
end
if ~handles.walls
if snake(1, 2) >= 10
snake(1, 2) = -10 + increment;
elseif snake(1, 2) <= -10
snake(1, 2) = 10 - increment;
elseif snake(1, 1) >= 10
snake(1, 1) = -10 + increment;
elseif snake(1, 1) <= -10
snake(1, 1) = 10 - increment;
end
end
%% adds three blocks to the snake length
function snake = growSnake(snake)
for i = 1:3
snake(length(snake(:, 1))+1, 1) = snake(length(snake(:, 1)), 1);
snake(length(snake(:, 2)), 2) = snake(length(snake(:, 2))-1, 2);
end
%% checks if the snake is in contact with wall or itself
function state = gamestate(snake)
state = false;
if snake(1, 2) == 10 || snake(1, 1) == 10 || ...
snake(1, 2) == -10 || snake(1, 1) == -10
state = true;
end
if length(snake(:,1)) ~= 1 && ...
contains([snake(2:length(snake(:,1)), 1) snake(2:length(snake(:,2)), 2)], [snake(1,1) snake(1,2)])
state = true;
end
%% generates a random point on the grid that is not in snake
function point = randomPoint(snake)
handles = get(gcf, 'userdata');
if get(handles.largeBoard, 'Value') == 1
values = [-.5 -1 -1.5 -2 -2.5 -3 -3.5 -4 -4.5 -5 -5.5 -6 -6.5 -7 -7.5 -8 -8.5 ...
-9 -9.5 0 .5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5];
else
values = [-1 -2 -3 -4 -5 -6 -7 -8 -9 0 1 2 3 4 5 6 7 8 9];
end
point(1) = values(randi(length(values)));
point(2) = values(randi(length(values)));
while contains(snake, point)
point(1) = values(randi(length(values)));
point(2) = values(randi(length(values)));
end
%% looks at keyboard input for the direction of the snake
function direction = getDirection(snake, currentDirection)
set(gcf, 'KeyPressFcn', @(x,y)get(gcf,'CurrentCharacter'))
direction = get(gcf, 'CurrentCharacter');
if isempty(direction) || (direction ~= 28 && direction ~= 29 && direction ~= 30 && direction ~= 31)
direction = currentDirection;
end
if length(snake(:,1)) ~= 1 && direction ~= currentDirection
if currentDirection == 30 && direction == 31
direction = 30;
elseif currentDirection == 31 && direction == 30
direction = 31;
elseif currentDirection == 28 && direction == 29
direction = 28;
elseif currentDirection == 29 && direction == 28
direction = 29;
end
end
%% checks if the head of the snake is colliding with the given point
function state = checkCollision(snake, point)
state = false;
if snake(1, 2) == point(2) && snake(1, 1) == point(1)
state = true;
end
%% checks if a given point is within the snake
function state = contains(snake, point)
state = false;
for i = 1:length(snake(:,1))
if snake(i, 1) == point(1) && snake(i, 2) == point(2)
state = true;
return
end
end