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flappybird.m
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flappybird.m
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function flappybird
%% System Variables:
GameVer = '1.0'; % The first full playable game
%% Constant Definitions:
GAME.MAX_FRAME_SKIP = [];
GAME.RESOLUTION = []; % Game Resolution, default at [256 144]
GAME.WINDOW_SCALE = 2; % The actual size of the window divided by resolution
GAME.FLOOR_TOP_Y = []; % The y position of upper crust of the floor.
GAME.N_UPDATES_PER_SEC = [];
GAME.FRAME_DURATION = [];
GAME.GRAVITY = 0.1356; %0.15; %0.2; %1356; % empirical gravity constant
TUBE.MIN_HEIGHT = []; % The minimum height of a tube
TUBE.RANGE_HEIGHT = []; % The range of the height of a tube
TUBE.SUM_HEIGHT = []; % The summed height of the upper and low tube
TUBE.H_SPACE = []; % Horizontal spacing between two tubs
TUBE.V_SPACE = []; % Vertical spacing between two tubs
TUBE.WIDTH = []; % The 'actual' width of the detection box
GAMEPLAY.RIGHT_X_FIRST_TUBE = []; % Xcoord of the right edge of the 1st tube
ShowFPS = true;
SHOWFPS_FRAMES = 5;
%% Handles
MainFigureHdl = [];
MainAxesHdl = [];
MainCanvasHdl = [];
BirdSpriteHdl = [];
TubeSpriteHdl = [];
BeginInfoHdl = [];
FloorSpriteHdl = [];
ScoreInfoHdl = [];
GameOverHdl = [];
FloorAxesHdl = [];
%% Game Parameters
MainFigureInitPos = [];
MainFigureSize = [];
MainAxesInitPos = []; % The initial position of the axes IN the figure
MainAxesSize = [];
InGameParams.CurrentBkg = 1;
InGameParams.CurrentBird = 1;
Flags.IsGameStarted = true; %
Flags.IsFirstTubeAdded = false; % Has the first tube been added to TubeLayer
Flags.ResetFloorTexture = true; % Result the pointer for the floor texture
Flags.PreGame = true;
Flags.NextTubeReady = true;
CloseReq = false;
FlyKeyNames = {'space', 'return', 'uparrow', 'w'};
FlyKeyStatus = false; %(size(FlyKeyNames));
FlyKeyValid = true(size(FlyKeyNames)); %
%% Canvases:
MainCanvas = [];
% The scroll layer for the tubes
TubeLayer.Alpha = [];
TubeLayer.CData = [];
%% RESOURCES:
Sprites = [];
%% Positions:
Bird.COLLIDE_MASK = [];
Bird.INIT_SCREEN_POS = [45 100]; % In [x y] order;
Bird.WorldX = [];
Bird.ScreenPos = [45 100]; %[45 100]; % Center = The 9th element horizontally (1based)
% And the 6th element vertically
Bird.SpeedXY = [ 0];
Bird.Angle = 0;
Bird.XGRID = [];
Bird.YGRID = [];
Bird.CurFrame = 1;
Bird.SpeedY = 0;
Bird.LastHeight = 0;
SinYRange = 44;
SinYPos = [];
SinY = [];
Score = 0;
Tubes.FrontP = 1; % 1-3
Tubes.ScreenX = [300 380 460]-2; % The middle of each tube
Tubes.VOffset = ceil(rand(1,3)*105);
Best = 0;
%% -- Game Logic --
initVariables();
initWindow();
if ShowFPS
fps_text_handle = text(10,10, 'FPS:60.0', 'Visible', 'off');
var_text_handle = text(10,20, '', 'Visible', 'off'); % Display a variable
total_frame_update = 0;
end
% Show flash screen
CurrentFrameNo = double(0);
fade_time = cumsum([1 3 1]);
pause(0.5);
logo_stl = text(72, 100, 'Stellari Studio', 'FontSize', 20, 'Color',[1 1 1], 'HorizontalAlignment', 'center');
logo_and = text(72, 130, 'and', 'FontSize', 10, 'Color',[1 1 1], 'HorizontalAlignment', 'center');
logo_ilovematlabcn = image([22 122], [150 180], Sprites.MatlabLogo, 'AlphaData',0);
stageStartTime = tic;
while 1
loops = 0;
curTime = toc(stageStartTime);
while (curTime >= ((CurrentFrameNo) * GAME.FRAME_DURATION) && loops < GAME.MAX_FRAME_SKIP)
if curTime < fade_time(1)
set(logo_stl, 'Color',1 - [1 1 1].*max(min(curTime/fade_time(1), 1),0));
set(logo_ilovematlabcn, 'AlphaData', max(min(curTime/fade_time(1), 1),0));
set(logo_and, 'Color',1 - [1 1 1].*max(min(curTime/fade_time(1), 1),0));
elseif curTime < fade_time(2)
set(logo_stl, 'Color',[0 0 0]);
set(logo_ilovematlabcn, 'AlphaData', 1);
set(logo_and, 'Color', [0 0 0]);
else
set(logo_stl, 'Color',[1 1 1].*max(min((curTime-fade_time(2))/(fade_time(3) - fade_time(2)), 1),0));
set(logo_ilovematlabcn, 'AlphaData',1-max(min((curTime-fade_time(2))/(fade_time(3) - fade_time(2)), 1),0));
set(logo_and, 'Color', [1 1 1].*max(min((curTime-fade_time(2))/(fade_time(3) - fade_time(2)), 1),0));
end
CurrentFrameNo = CurrentFrameNo + 1;
loops = loops + 1;
frame_updated = true;
end
if frame_updated
drawnow;
end
if curTime > fade_time
break;
end
end
delete(logo_stl);
delete(logo_ilovematlabcn);
delete(logo_and);
pause(1);
% Main Game
while 1
initGame();
CurrentFrameNo = double(0);
collide = false;
fall_to_bottom = false;
gameover = false;
stageStartTime = tic;
c = stageStartTime;
FPS_lastTime = toc(stageStartTime);
while 1
loops = 0;
curTime = toc(stageStartTime);
while (curTime >= ((CurrentFrameNo) * GAME.FRAME_DURATION) && loops < GAME.MAX_FRAME_SKIP)
if FlyKeyStatus % If left key is pressed
if ~gameover
Bird.SpeedY = -2.5; % -2.5;
FlyKeyStatus = false;
Bird.LastHeight = Bird.ScreenPos(2);
if Flags.PreGame
Flags.PreGame = false;
set(BeginInfoHdl, 'Visible','off');
set(ScoreInfoBackHdl, 'Visible','on');
set(ScoreInfoForeHdl, 'Visible','on');
Bird.ScrollX = 0;
end
else
if Bird.SpeedY < 0
Bird.SpeedY = 0;
end
end
end
if Flags.PreGame
processCPUBird;
else
processBird;
Bird.ScrollX = Bird.ScrollX + 1;
if ~gameover
scrollTubes(1);
end
end
addScore;
Bird.CurFrame = 3 - floor(double(mod(CurrentFrameNo, 9))/3);
%% Cycling the Palette
% Update the cycle variables
collide = isCollide();
if collide
gameover = true;
end
CurrentFrameNo = CurrentFrameNo + 1;
loops = loops + 1;
frame_updated = true;
% If the bird has fallen to the ground
if Bird.ScreenPos(2) >= 200-5;
Bird.ScreenPos(2) = 200-5;
gameover = true;
if abs(Bird.Angle - pi/2) < 1e-3
fall_to_bottom = true;
FlyKeyStatus = false;
end
end
end
%% Redraw the frame if the world has been processed
if frame_updated
% drawToMainCanvas();
set(MainCanvasHdl, 'CData', MainCanvas(1:200,:,:));
% Bird.Angle = double(mod(CurrentFrameNo,360))*pi/180;
if fall_to_bottom
Bird.CurFrame = 2;
end
refreshBird();
refreshTubes();
if (~gameover)
refreshFloor(CurrentFrameNo);
end
curScoreString = sprintf('%d',(Score));
set(ScoreInfoForeHdl, 'String', curScoreString);
set(ScoreInfoBackHdl, 'String', curScoreString);
drawnow;
frame_updated = false;
c = toc(stageStartTime);
if ShowFPS
total_frame_update = total_frame_update + 1;
varname = 'collide';%'Mario.curFrame';
if mod(total_frame_update,SHOWFPS_FRAMES) == 0 % If time to update fps
set(fps_text_handle, 'String',sprintf('FPS: %.2f',SHOWFPS_FRAMES./(c-FPS_lastTime)));
FPS_lastTime = toc(stageStartTime);
end
set(var_text_handle, 'String', sprintf('%s = %.2f', varname, eval(varname)));
end
end
if fall_to_bottom
if Score > Best
Best = Score;
for i_save = 1:4 % Try saving four times if error occurs
try
save sprites2.mat Best -append
break;
catch
continue;
end
end % If the error still persist even after four saves, then
if i_save == 4
disp('FLAPPY_BIRD: Can''t save high score');
end
end
score_report = {sprintf('Score: %d', Score), sprintf('Best: %d', Best)};
set(ScoreInfoHdl, 'Visible','on', 'String', score_report);
set(GameOverHdl, 'Visible','on');
save sprites2.mat Best -append
if FlyKeyStatus
FlyKeyStatus = false;
break;
end
end
if CloseReq
delete(MainFigureHdl);
clear all;
return;
end
end
end
function initVariables()
Sprites = load('sprites2.mat');
GAME.MAX_FRAME_SKIP = 5;
GAME.RESOLUTION = [256 144];
GAME.WINDOW_RES = [256 144];
GAME.FLOOR_HEIGHT = 56;
GAME.FLOOR_TOP_Y = GAME.RESOLUTION(1) - GAME.FLOOR_HEIGHT + 1;
GAME.N_UPDATE_PERSEC = 60;
GAME.FRAME_DURATION = 1/GAME.N_UPDATE_PERSEC;
TUBE.H_SPACE = 80; % Horizontal spacing between two tubs
TUBE.V_SPACE = 48; % Vertical spacing between two tubs
TUBE.WIDTH = 24; % The 'actual' width of the detection box
TUBE.MIN_HEIGHT = 36;
TUBE.SUM_HEIGHT = GAME.RESOLUTION(1)-TUBE.V_SPACE-...
GAME.FLOOR_HEIGHT;
TUBE.RANGE_HEIGHT = TUBE.SUM_HEIGHT -TUBE.MIN_HEIGHT*2;
TUBE.PASS_POINT = [1 44];
%TUBE.RANGE_HEIGHT_DOWN; % Sorry you just don't have a choice
GAMEPLAY.RIGHT_X_FIRST_TUBE = 300; % Xcoord of the right edge of the 1st tube
%% Handles
MainFigureHdl = [];
MainAxesHdl = [];
%% Game Parameters
MainFigureInitPos = [500 100];
MainFigureSize = GAME.WINDOW_RES([2 1]).*2;
MainAxesInitPos = [0 0]; %[0.1 0.1]; % The initial position of the axes IN the figure
MainAxesSize = [144 200]; % GAME.WINDOW_RES([2 1]);
FloorAxesSize = [144 56];
%% Canvases:
MainCanvas = uint8(zeros([GAME.RESOLUTION 3]));
bird_size = Sprites.Bird.Size;
[Bird.XGRID, Bird.YGRID] = meshgrid([-ceil(bird_size(2)/2):floor(bird_size(2)/2)], ...
[ceil(bird_size(1)/2):-1:-floor(bird_size(1)/2)]);
Bird.COLLIDE_MASK = false(12,12);
[tempx tempy] = meshgrid(linspace(-1,1,12));
Bird.COLLIDE_MASK = (tempx.^2 + tempy.^2) <= 1;
Bird.OSCIL_RANGE = [128 4]; % [YPos, Amplitude]
SinY = Bird.OSCIL_RANGE(1) + sin(linspace(0, 2*pi, SinYRange))* Bird.OSCIL_RANGE(2);
SinYPos = 1;
Best = Sprites.Best; % Best Score
end
%% --- Graphics Section ---
function initWindow()
% initWindow - initialize the main window, axes and image objects
MainFigureHdl = figure('Name', ['Flappy Bird ' GameVer], ...
'NumberTitle' ,'off', ...
'Units', 'pixels', ...
'Position', [MainFigureInitPos, MainFigureSize], ...
'MenuBar', 'figure', ...
'Renderer', 'OpenGL',...
'Color',[0 0 0], ...
'KeyPressFcn', @stl_KeyPressFcn, ...
'WindowKeyPressFcn', @stl_KeyDown,...
'WindowKeyReleaseFcn', @stl_KeyUp,...
'CloseRequestFcn', @stl_CloseReqFcn);
FloorAxesHdl = axes('Parent', MainFigureHdl, ...
'Units', 'normalized',...
'Position', [MainAxesInitPos, (1-MainAxesInitPos.*2) .* [1 56/256]], ...
'color', [1 1 1], ...
'XLim', [0 MainAxesSize(1)]-0.5, ...
'YLim', [0 56]-0.5, ...
'YDir', 'reverse', ...
'NextPlot', 'add', ...
'Visible', 'on',...
'XTick',[], 'YTick', []);
MainAxesHdl = axes('Parent', MainFigureHdl, ...
'Units', 'normalized',...
'Position', [MainAxesInitPos + [0 (1-MainAxesInitPos(2).*2)*56/256], (1-MainAxesInitPos.*2).*[1 200/256]], ...
'color', [1 1 1], ...
'XLim', [0 MainAxesSize(1)]-0.5, ...
'YLim', [0 MainAxesSize(2)]-0.5, ...
'YDir', 'reverse', ...
'NextPlot', 'add', ...
'Visible', 'on', ...
'XTick',[], ...
'YTick',[]);
MainCanvasHdl = image([0 MainAxesSize(1)-1], [0 MainAxesSize(2)-1], [],...
'Parent', MainAxesHdl,...
'Visible', 'on');
TubeSpriteHdl = zeros(1,3);
for i = 1:3
TubeSpriteHdl(i) = image([0 26-1], [0 304-1], [],...
'Parent', MainAxesHdl,...
'Visible', 'on');
end
BirdSpriteHdl = surface(Bird.XGRID-100,Bird.YGRID-100, ...
zeros(size(Bird.XGRID)), Sprites.Bird.CDataNan(:,:,:,1), ...
'CDataMapping', 'direct',...
'EdgeColor','none', ...
'Visible','on', ...
'Parent', MainAxesHdl);
FloorSpriteHdl = image([0], [0],[],...
'Parent', FloorAxesHdl, ...
'Visible', 'on ');
BeginInfoHdl = text(72, 100, 'Tap SPACE to begin', ...
'FontName', 'Helvetica', 'FontSize', 20, 'HorizontalAlignment', 'center','Color',[.25 .25 .25], 'Visible','off');
ScoreInfoBackHdl = text(72, 50, '0', ...
'FontName', 'Helvetica', 'FontSize', 30, 'HorizontalAlignment', 'center','Color',[0,0,0], 'Visible','off');
ScoreInfoForeHdl = text(70.5, 48.5, '0', ...
'FontName', 'Helvetica', 'FontSize', 30, 'HorizontalAlignment', 'center', 'Color',[1 1 1], 'Visible','off');
GameOverHdl = text(72, 70, 'GAME OVER', ...
'FontName', 'Arial', 'FontSize', 20, 'HorizontalAlignment', 'center','Color',[1 0 0], 'Visible','off');
ScoreInfoHdl = text(72, 110, 'Best', ...
'FontName', 'Helvetica', 'FontSize', 20, 'FontWeight', 'Bold', 'HorizontalAlignment', 'center','Color',[1 1 1], 'Visible', 'off');
end
function initGame()
% The scroll layer for the tubes
TubeLayer.Alpha = false([GAME.RESOLUTION.*[1 2] 3]);
TubeLayer.CData = uint8(zeros([GAME.RESOLUTION.*[1 2] 3]));
Bird.Angle = 0;
Score = 0;
%TubeLayer.Alpha(GAME.FLOOR_TOP_Y:GAME.RESOLUTION(1), :, :) = true;
Flags.ResetFloorTexture = true;
SinYPos = 1;
Flags.PreGame = true;
% scrollTubeLayer(GAME.RESOLUTION(2)); % Do it twice to fill the
% disp('mhaha');
% scrollTubeLayer(GAME.RESOLUTION(2)); % Entire tube layer
drawToMainCanvas();
set(MainCanvasHdl, 'CData', MainCanvas);
set(BeginInfoHdl, 'Visible','on');
set(ScoreInfoHdl, 'Visible','off');
set(ScoreInfoBackHdl, 'Visible','off');
set(ScoreInfoForeHdl, 'Visible','off');
set(GameOverHdl, 'Visible','off');
set(FloorSpriteHdl, 'CData',Sprites.Floor.CData);
Tubes.FrontP = 1; % 1-3
Tubes.ScreenX = [300 380 460]-2; % The middle of each tube
Tubes.VOffset = ceil(rand(1,3)*105);
refreshTubes;
for i = 1:3
set(TubeSpriteHdl(i),'CData',Sprites.TubGap.CData,...
'AlphaData',Sprites.TubGap.Alpha);
redrawTube(i);
end
if ShowFPS
set(fps_text_handle, 'Visible', 'on');
set(var_text_handle, 'Visible', 'on'); % Display a variable
end
end
%% Game Logic
function processBird()
Bird.ScreenPos(2) = Bird.ScreenPos(2) + Bird.SpeedY;
Bird.SpeedY = Bird.SpeedY + GAME.GRAVITY;
if Bird.SpeedY < 0
Bird.Angle = max(Bird.Angle - pi/10, -pi/10);
else
if Bird.ScreenPos(2) < Bird.LastHeight
Bird.Angle = -pi/10; %min(Bird.Angle + pi/100, pi/2);
else
Bird.Angle = min(Bird.Angle + pi/30, pi/2);
end
end
end
function processCPUBird() % Process the bird when the game is not started
Bird.ScreenPos(2) = SinY(SinYPos);
SinYPos = mod(SinYPos, SinYRange)+1;
end
function drawToMainCanvas()
% Draw the scrolls and sprites to the main canvas
% Redraw the background
MainCanvas = Sprites.Bkg.CData(:,:,:,InGameParams.CurrentBkg);
TubeFirstCData = TubeLayer.CData(:, 1:GAME.RESOLUTION(2), :);
TubeFirstAlpha = TubeLayer.Alpha(:, 1:GAME.RESOLUTION(2), :);
% Plot the first half of TubeLayer
MainCanvas(TubeFirstAlpha) = ...
TubeFirstCData (TubeFirstAlpha);
end
function scrollTubes(offset)
Tubes.ScreenX = Tubes.ScreenX - offset;
if Tubes.ScreenX(Tubes.FrontP) <=-26
Tubes.ScreenX(Tubes.FrontP) = Tubes.ScreenX(Tubes.FrontP) + 240;
Tubes.VOffset(Tubes.FrontP) = ceil(rand*105);
redrawTube(Tubes.FrontP);
Tubes.FrontP = mod((Tubes.FrontP),3)+1;
Flags.NextTubeReady = true;
end
end
function refreshTubes()
% Refreshing Scheme 1: draw the entire tubes but only shows a part
% of each
for i = 1:3
set(TubeSpriteHdl(i), 'XData', Tubes.ScreenX(i) + [0 26-1]);
end
end
function refreshFloor(frameNo)
offset = mod(frameNo, 24);
set(FloorSpriteHdl, 'XData', -offset);
end
function redrawTube(i)
set(TubeSpriteHdl(i), 'YData', -(Tubes.VOffset(i)-1));
end
%% --- Math Functions for handling Collision / Rotation etc. ---
function collide_flag = isCollide()
collide_flag = 0;
if Bird.ScreenPos(1) >= Tubes.ScreenX(Tubes.FrontP)-5 && ...
Bird.ScreenPos(1) <= Tubes.ScreenX(Tubes.FrontP)+6+25
else
return;
end
GapY = [128 177] - (Tubes.VOffset(Tubes.FrontP)-1); % The upper and lower bound of the GAP, 0-based
if Bird.ScreenPos(2) < GapY(1)+4 || Bird.ScreenPos(2) > GapY(2)-4
collide_flag = 1;
end
return;
end
function addScore()
if Tubes.ScreenX(Tubes.FrontP) < 40 && Flags.NextTubeReady
Flags.NextTubeReady = false;
Score = Score + 1;
end
end
function refreshBird()
% move bird to pos [X Y],
% and rotate the bird surface by X degrees, anticlockwise = +
cosa = cos(Bird.Angle);
sina = sin(Bird.Angle);
xrotgrid = cosa .* Bird.XGRID + sina .* Bird.YGRID;
yrotgrid = sina .* Bird.XGRID - cosa .* Bird.YGRID;
xtransgrid = xrotgrid + Bird.ScreenPos(1)-0.5;
ytransgrid = yrotgrid + Bird.ScreenPos(2)-0.5;
set(BirdSpriteHdl, 'XData', xtransgrid, ...
'YData', ytransgrid, ...
'CData', Sprites.Bird.CDataNan(:,:,:, Bird.CurFrame));
end
%% -- Display Infos --
%% -- Callbacks --
function stl_KeyUp(hObject, eventdata, handles)
key = get(hObject,'CurrentKey');
% Remark the released keys as valid
FlyKeyValid = FlyKeyValid | strcmp(key, FlyKeyNames);
end
function stl_KeyDown(hObject, eventdata, handles)
key = get(hObject,'CurrentKey');
% Has to be both 'pressed' and 'valid';
% Two key presses at the same time will be counted as 1 key press
down_keys = strcmp(key, FlyKeyNames);
FlyKeyStatus = any(FlyKeyValid & down_keys);
FlyKeyValid = FlyKeyValid & (~down_keys);
end
function stl_KeyPressFcn(hObject, eventdata, handles)
curKey = get(hObject, 'CurrentKey');
switch true
case strcmp(curKey, 'escape')
CloseReq = true;
end
end
function stl_CloseReqFcn(hObject, eventdata, handles)
CloseReq = true;
end
end