function _isIpad() {
var isIpad = navigator.userAgent.toLowerCase().indexOf('ipad') !== -1;
if (!isIpad && navigator.userAgent.match(/Mac/) && navigator.maxTouchPoints && navigator.maxTouchPoints > 2) {
return true;
}
return isIpad;
}
function Runner(outerContainerId, opt_config) {
if(Runner.instance_) {
return Runner.instance_;
}
Runner.instance_ = this;
this.outerContainerEl = document.querySelector(outerContainerId);
this.containerEl = null;
this.snackbarEl = null;
this.touchController = null;
this.detailsButton = this.outerContainerEl.querySelector('#details-button');
this.config = opt_config || Runner.config;
this.dimensions = Runner.defaultDimensions;
this.canvas = null;
this.canvasCtx = null;
this.tRex = null;
this.distanceMeter = null;
this.distanceRan = 0;
this.highestScore = window.localStorage.getItem("chrome-dino");
this.time = 0;
this.runningTime = 0;
this.msPerFrame = 1000 / FPS;
this.currentSpeed = this.config.SPEED;
this.obstacles = [];
this.activated = false;
this.playing = false;
this.crashed = false;
this.paused = false;
this.inverted = false;
this.invertTimer = 0;
this.resizeTimerId_ = null;
this.playCount = 0;
this.audioBuffer = null;
this.soundFx = {};
this.audioContext = null;
this.images = {};
this.imagesLoaded = 0;
this.pollingGamepads = false;
this.gamepadIndex = undefined;
this.previousGamepad = null;
if(this.isDisabled()) {
this.setupDisabledRunner();
} else {
this.loadImages();
}
}
var DEFAULT_WIDTH = 600;
var FPS = 60;
var IS_HIDPI = window.devicePixelRatio > 1;
var IS_IOS = !!window.navigator.userAgent.match(/iP(hone|ad|od)/i) && !!window.navigator.userAgent.match(/Safari/i)
|| _isIpad() || /CriOS/.test(window.navigator.userAgent) || /FxiOS/.test(window.navigator.userAgent);
var IS_MOBILE = /Android/.test(window.navigator.userAgent) || IS_IOS;
Runner.config = {
ACCELERATION: 0.001,
BG_CLOUD_SPEED: 0.2,
BOTTOM_PAD: 10,
CLEAR_TIME: 3000,
CLOUD_FREQUENCY: 0.5,
GAMEOVER_CLEAR_TIME: 1200,
GAP_COEFFICIENT: 0.6,
GRAVITY: 0.6,
INITIAL_JUMP_VELOCITY: 12,
INVERT_FADE_DURATION: 12000,
INVERT_DISTANCE: 700,
MAX_BLINK_COUNT: 3,
MAX_CLOUDS: 6,
MAX_OBSTACLE_LENGTH: 3,
MAX_OBSTACLE_DUPLICATION: 2,
MAX_SPEED: 13,
MIN_JUMP_HEIGHT: 35,
MOBILE_SPEED_COEFFICIENT: 1.2,
RESOURCE_TEMPLATE_ID: 'audio-resources',
SPEED: 6,
SPEED_DROP_COEFFICIENT: 3,
ARCADE_MODE_INITIAL_TOP_POSITION: 35,
ARCADE_MODE_TOP_POSITION_PERCENT: 0.1
};
Runner.defaultDimensions = {
WIDTH: DEFAULT_WIDTH,
HEIGHT: 150
};
Runner.classes = {
ARCADE_MODE: 'arcade-mode',
CANVAS: 'runner-canvas',
CONTAINER: 'runner-container',
CRASHED: 'crashed',
ICON: 'icon-offline',
INVERTED: 'inverted',
SNACKBAR: 'snackbar',
SNACKBAR_SHOW: 'snackbar-show',
TOUCH_CONTROLLER: 'controller'
};
Runner.spriteDefinition = {
LDPI: {
CACTUS_LARGE: {
x: 332,
y: 2
},
CACTUS_SMALL: {
x: 228,
y: 2
},
CLOUD: {
x: 86,
y: 2
},
HORIZON: {
x: 2,
y: 54
},
MOON: {
x: 484,
y: 2
},
PTERODACTYL: {
x: 134,
y: 2
},
RESTART: {
x: 2,
y: 2
},
TEXT_SPRITE: {
x: 655,
y: 2
},
TREX: {
x: 848,
y: 2
},
STAR: {
x: 645,
y: 2
}
},
HDPI: {
CACTUS_LARGE: {
x: 652,
y: 2
},
CACTUS_SMALL: {
x: 446,
y: 2
},
CLOUD: {
x: 166,
y: 2
},
HORIZON: {
x: 2,
y: 104
},
MOON: {
x: 954,
y: 2
},
PTERODACTYL: {
x: 260,
y: 2
},
RESTART: {
x: 2,
y: 2
},
TEXT_SPRITE: {
x: 1294,
y: 2
},
TREX: {
x: 1678,
y: 2
},
STAR: {
x: 1276,
y: 2
}
}
};
Runner.sounds = {
BUTTON_PRESS: 'offline-sound-press',
HIT: 'offline-sound-hit',
SCORE: 'offline-sound-reached'
};
Runner.keycodes = {
JUMP: {
'38': 1,
'32': 1
},
DUCK: {
'40': 1
},
RESTART: {
'13': 1
}
};
Runner.events = {
ANIM_END: 'webkitAnimationEnd',
CLICK: 'click',
KEYDOWN: 'keydown',
KEYUP: 'keyup',
POINTERDOWN: 'pointerdown',
POINTERUP: 'pointerup',
RESIZE: 'resize',
TOUCHEND: 'touchend',
TOUCHSTART: 'touchstart',
VISIBILITY: 'visibilitychange',
BLUR: 'blur',
FOCUS: 'focus',
LOAD: 'load',
GAMEPADCONNECTED: 'gamepadconnected',
};
Runner.prototype = {
isDisabled: function() {
return false;
},
setupDisabledRunner: function() {
this.containerEl = document.createElement('div');
this.containerEl.className = Runner.classes.SNACKBAR;
this.containerEl.textContent = loadTimeData.getValue('disabledEasterEgg');
this.outerContainerEl.appendChild(this.containerEl);
document.addEventListener(Runner.events.KEYDOWN, function(e) {
if(Runner.keycodes.JUMP[e.keyCode]) {
this.containerEl.classList.add(Runner.classes.SNACKBAR_SHOW);
document.querySelector('.icon').classList.add('icon-disabled');
}
}.bind(this));
},
updateConfigSetting: function(setting, value) {
if(setting in this.config && value != undefined) {
this.config[setting] = value;
switch(setting) {
case 'GRAVITY':
case 'MIN_JUMP_HEIGHT':
case 'SPEED_DROP_COEFFICIENT':
this.tRex.config[setting] = value;
break;
case 'INITIAL_JUMP_VELOCITY':
this.tRex.setJumpVelocity(value);
break;
case 'SPEED':
this.setSpeed(value);
break;
}
}
},
loadImages: function() {
if(IS_HIDPI) {
Runner.imageSprite = document.getElementById('offline-resources-2x');
this.spriteDef = Runner.spriteDefinition.HDPI;
} else {
Runner.imageSprite = document.getElementById('offline-resources-1x');
this.spriteDef = Runner.spriteDefinition.LDPI;
}
if(Runner.imageSprite.complete) {
this.init();
} else {
Runner.imageSprite.addEventListener(Runner.events.LOAD,
this.init.bind(this));
}
},
loadSounds: function() {
if(!IS_IOS) {
this.audioContext = new AudioContext();
var resourceTemplate =
document.getElementById(this.config.RESOURCE_TEMPLATE_ID).content;
for(var sound in Runner.sounds) {
var soundSrc =
resourceTemplate.getElementById(Runner.sounds[sound]).src;
soundSrc = soundSrc.substr(soundSrc.indexOf(',') + 1);
var buffer = decodeBase64ToArrayBuffer(soundSrc);
this.audioContext.decodeAudioData(buffer, function(index, audioData) {
this.soundFx[index] = audioData;
}.bind(this, sound));
}
}
},
setSpeed: function(opt_speed) {
var speed = opt_speed || this.currentSpeed;
if(this.dimensions.WIDTH < DEFAULT_WIDTH) {
var mobileSpeed = speed * this.dimensions.WIDTH / DEFAULT_WIDTH *
this.config.MOBILE_SPEED_COEFFICIENT;
this.currentSpeed = mobileSpeed > speed ? speed : mobileSpeed;
} else if(opt_speed) {
this.currentSpeed = opt_speed;
}
},
init: function() {
document.querySelector('.' + Runner.classes.ICON).style.visibility =
'hidden';
this.adjustDimensions();
this.setSpeed();
this.containerEl = document.createElement('div');
this.containerEl.className = Runner.classes.CONTAINER;
this.canvas = createCanvas(this.containerEl, this.dimensions.WIDTH,
this.dimensions.HEIGHT, Runner.classes.PLAYER);
this.canvasCtx = this.canvas.getContext('2d');
this.canvasCtx.fillStyle = '#f7f7f7';
this.canvasCtx.fill();
Runner.updateCanvasScaling(this.canvas);
this.horizon = new Horizon(this.canvas, this.spriteDef, this.dimensions,
this.config.GAP_COEFFICIENT);
this.distanceMeter = new DistanceMeter(this.canvas,
this.spriteDef.TEXT_SPRITE, this.dimensions.WIDTH);
this.tRex = new Trex(this.canvas, this.spriteDef.TREX);
this.outerContainerEl.appendChild(this.containerEl);
if(IS_MOBILE) {
this.createTouchController();
}
this.startListening();
this.update();
window.addEventListener(Runner.events.RESIZE,
this.debounceResize.bind(this));
const darkModeMediaQuery =
window.matchMedia('(prefers-color-scheme: dark)');
this.isDarkMode = darkModeMediaQuery && darkModeMediaQuery.matches;
darkModeMediaQuery.addListener((e) => {
this.isDarkMode = e.matches;
});
},
createTouchController: function() {
this.touchController = document.createElement('div');
this.touchController.className = Runner.classes.TOUCH_CONTROLLER;
this.touchController.addEventListener(Runner.events.TOUCHSTART, this);
this.touchController.addEventListener(Runner.events.TOUCHEND, this);
this.outerContainerEl.appendChild(this.touchController);
},
debounceResize: function() {
if(!this.resizeTimerId_) {
this.resizeTimerId_ =
setInterval(this.adjustDimensions.bind(this), 250);
}
},
adjustDimensions: function() {
clearInterval(this.resizeTimerId_);
this.resizeTimerId_ = null;
var boxStyles = window.getComputedStyle(this.outerContainerEl);
var padding = Number(boxStyles.paddingLeft.substr(0,
boxStyles.paddingLeft.length - 2));
this.dimensions.WIDTH = this.outerContainerEl.offsetWidth - padding * 2;
if(this.activated) {
this.dimensions.WIDTH = Math.min(DEFAULT_WIDTH, this.dimensions.WIDTH);
this.setArcadeModeContainerScale();
}
if(this.canvas) {
this.canvas.width = this.dimensions.WIDTH;
this.canvas.height = this.dimensions.HEIGHT;
Runner.updateCanvasScaling(this.canvas);
this.distanceMeter.calcXPos(this.dimensions.WIDTH);
this.clearCanvas();
this.horizon.update(0, 0, true);
this.tRex.update(0);
if(this.playing || this.crashed || this.paused) {
this.containerEl.style.width = this.dimensions.WIDTH + 'px';
this.containerEl.style.height = this.dimensions.HEIGHT + 'px';
this.distanceMeter.update(0, Math.ceil(this.distanceRan));
this.stop();
} else {
this.tRex.draw(0, 0);
}
if(this.crashed && this.gameOverPanel) {
this.gameOverPanel.updateDimensions(this.dimensions.WIDTH);
this.gameOverPanel.draw();
}
}
},
playIntro: function() {
if(!this.activated && !this.crashed) {
this.playingIntro = true;
this.tRex.playingIntro = true;
this.distanceMeter.setHighScore(window.localStorage.getItem("chrome-dino"));
var keyframes = '@-webkit-keyframes intro { ' +
'from { width:' + Trex.config.WIDTH + 'px }' +
'to { width: ' + this.dimensions.WIDTH + 'px }' +
'}';
var sheet = document.createElement('style');
sheet.innerHTML = keyframes;
document.head.appendChild(sheet);
this.containerEl.addEventListener(Runner.events.ANIM_END,
this.startGame.bind(this));
this.containerEl.style.webkitAnimation = 'intro .4s ease-out 1 both';
this.containerEl.style.width = this.dimensions.WIDTH + 'px';
this.playing = true;
this.activated = true;
} else if(this.crashed) {
this.restart();
}
},
startGame: function() {
this.setArcadeMode();
this.runningTime = 0;
this.playingIntro = false;
this.tRex.playingIntro = false;
this.containerEl.style.webkitAnimation = '';
this.playCount++;
document.addEventListener(Runner.events.VISIBILITY,
this.onVisibilityChange.bind(this));
window.addEventListener(Runner.events.BLUR,
this.onVisibilityChange.bind(this));
window.addEventListener(Runner.events.FOCUS,
this.onVisibilityChange.bind(this));
},
clearCanvas: function() {
this.canvasCtx.clearRect(0, 0, this.dimensions.WIDTH,
this.dimensions.HEIGHT);
},
update: function() {
this.updatePending = false;
var now = getTimeStamp();
var deltaTime = now - (this.time || now);
this.time = now;
if(this.playing) {
this.clearCanvas();
if(this.tRex.jumping) {
this.tRex.updateJump(deltaTime);
}
this.runningTime += deltaTime;
var hasObstacles = this.runningTime > this.config.CLEAR_TIME;
if(this.tRex.jumpCount == 1 && !this.playingIntro) {
this.playIntro();
}
if(this.playingIntro) {
this.horizon.update(0, this.currentSpeed, hasObstacles);
} else if(!this.crashed) {
const showNightMode = this.isDarkMode ^ this.inverted;
deltaTime = !this.activated ? 0 : deltaTime;
this.horizon.update(deltaTime, this.currentSpeed, hasObstacles,
showNightMode);
}
var collision = hasObstacles &&
checkForCollision(this.horizon.obstacles[0], this.tRex);
if(!collision) {
this.distanceRan += this.currentSpeed * deltaTime / this.msPerFrame;
if(this.currentSpeed < this.config.MAX_SPEED) {
this.currentSpeed += this.config.ACCELERATION;
}
} else {
this.gameOver();
}
var playAchievementSound = this.distanceMeter.update(deltaTime,
Math.ceil(this.distanceRan));
if(playAchievementSound) {
this.playSound(this.soundFx.SCORE);
}
if(this.invertTimer > this.config.INVERT_FADE_DURATION) {
this.invertTimer = 0;
this.invertTrigger = false;
this.invert();
} else if(this.invertTimer) {
this.invertTimer += deltaTime;
} else {
var actualDistance =
this.distanceMeter.getActualDistance(Math.ceil(this.distanceRan));
if(actualDistance > 0) {
this.invertTrigger = !(actualDistance %
this.config.INVERT_DISTANCE);
if(this.invertTrigger && this.invertTimer === 0) {
this.invertTimer += deltaTime;
this.invert();
}
}
}
}
if(this.playing || (!this.activated &&
this.tRex.blinkCount < Runner.config.MAX_BLINK_COUNT)) {
this.tRex.update(deltaTime);
this.scheduleNextUpdate();
}
},
handleEvent: function(e) {
return (function(evtType, events) {
switch(evtType) {
case events.KEYDOWN:
case events.TOUCHSTART:
case events.POINTERDOWN:
this.onKeyDown(e);
break;
case events.KEYUP:
case events.TOUCHEND:
case events.POINTERUP:
this.onKeyUp(e);
break;
case events.GAMEPADCONNECTED:
this.onGamepadConnected(e);
break;
}
}.bind(this))(e.type, Runner.events);
},
startListening: function() {
document.addEventListener(Runner.events.KEYDOWN, this);
document.addEventListener(Runner.events.KEYUP, this);
window.addEventListener(Runner.events.GAMEPADCONNECTED, this);
this.containerEl.addEventListener(Runner.events.TOUCHSTART, this);
document.addEventListener(Runner.events.POINTERDOWN, this);
document.addEventListener(Runner.events.POINTERUP, this);
},
stopListening: function() {
document.removeEventListener(Runner.events.KEYDOWN, this);
document.removeEventListener(Runner.events.KEYUP, this);
window.removeEventListener(Runner.events.GAMEPADCONNECTED, this);
if (this.touchController) {
this.touchController.removeEventListener(Runner.events.TOUCHSTART, this);
this.touchController.removeEventListener(Runner.events.TOUCHEND, this);
}
this.containerEl.removeEventListener(Runner.events.TOUCHSTART, this);
document.removeEventListener(Runner.events.POINTERDOWN, this);
document.removeEventListener(Runner.events.POINTERUP, this);
},
onKeyDown: function(e) {
if(IS_MOBILE && this.playing) {
e.preventDefault();
}
if(e.target != this.detailsButton) {
if(!this.crashed && (Runner.keycodes.JUMP[e.keyCode] ||
e.type == Runner.events.TOUCHSTART)) {
if(!this.playing) {
this.loadSounds();
this.playing = true;
this.update();
if(window.errorPageController) {
errorPageController.trackEasterEgg();
}
}
if(!this.tRex.jumping && !this.tRex.ducking) {
this.playSound(this.soundFx.BUTTON_PRESS);
this.tRex.startJump(this.currentSpeed);
}
}
if(this.crashed && e.type == Runner.events.TOUCHSTART &&
e.currentTarget == this.containerEl) {
this.restart();
}
}
if(this.playing && !this.crashed && Runner.keycodes.DUCK[e.keyCode]) {
e.preventDefault();
if(this.tRex.jumping) {
this.tRex.setSpeedDrop();
} else if(!this.tRex.jumping && !this.tRex.ducking) {
this.tRex.setDuck(true);
}
}
},
onKeyUp: function(e) {
var keyCode = String(e.keyCode);
var isjumpKey = Runner.keycodes.JUMP[keyCode] ||
e.type == Runner.events.TOUCHEND ||
e.type == Runner.events.POINTERUP;
if(this.isRunning() && isjumpKey) {
this.tRex.endJump();
} else if(Runner.keycodes.DUCK[keyCode]) {
this.tRex.speedDrop = false;
this.tRex.setDuck(false);
} else if(this.crashed) {
var deltaTime = getTimeStamp() - this.time;
if(Runner.keycodes.RESTART[keyCode] || this.isLeftClickOnCanvas(e) ||
(deltaTime >= this.config.GAMEOVER_CLEAR_TIME &&
Runner.keycodes.JUMP[keyCode])) {
this.restart();
}
} else if(this.paused && isjumpKey) {
this.tRex.reset();
this.play();
}
},
onGamepadConnected: function(e) {
if (!this.pollingGamepads) {
this.pollGamepadState();
}
},
pollGamepadState: function() {
var gamepads = navigator.getGamepads();
this.pollActiveGamepad(gamepads);
this.pollingGamepads = true;
requestAnimationFrame(this.pollGamepadState.bind(this));
},
pollForActiveGamepad: function(gamepads) {
for (var i = 0; i < gamepads.length; ++i) {
if (gamepads[i] && gamepads[i].buttons.length > 0 &&
gamepads[i].buttons[0].pressed) {
this.gamepadIndex = i;
this.pollActiveGamepad(gamepads);
return;
}
}
},
pollActiveGamepad: function(gamepads) {
if (this.gamepadIndex === undefined) {
this.pollForActiveGamepad(gamepads);
return;
}
var gamepad = gamepads[this.gamepadIndex];
if (!gamepad) {
this.gamepadIndex = undefined;
this.pollForActiveGamepad(gamepads);
return;
}
this.pollGamepadButton(gamepad, 0, 38);
if (gamepad.buttons.length >= 2) {
this.pollGamepadButton(gamepad, 1, 40);
}
if (gamepad.buttons.length >= 10) {
this.pollGamepadButton(gamepad, 9, 13);
}
this.previousGamepad = gamepad;
},
pollGamepadButton: function(gamepad, buttonIndex, keyCode) {
var state = gamepad.buttons[buttonIndex].pressed;
var previousState = false;
if (this.previousGamepad) {
previousState = this.previousGamepad.buttons[buttonIndex].pressed;
}
if (state != previousState) {
var e = new KeyboardEvent(state ? Runner.events.KEYDOWN
: Runner.events.KEYUP,
{ keyCode: keyCode });
document.dispatchEvent(e);
}
},
isLeftClickOnCanvas: function(e) {
return e.button != null && e.button < 2 &&
e.type == Runner.events.POINTERUP && e.target == this.canvas;
},
scheduleNextUpdate: function() {
if(!this.updatePending) {
this.updatePending = true;
this.raqId = requestAnimationFrame(this.update.bind(this));
}
},
isRunning: function() {
return !!this.raqId;
},
gameOver: function() {
this.playSound(this.soundFx.HIT);
vibrate(200);
this.stop();
this.crashed = true;
this.distanceMeter.achievement = false;
this.tRex.update(100, Trex.status.CRASHED);
if(!this.gameOverPanel) {
this.gameOverPanel = new GameOverPanel(this.canvas,
this.spriteDef.TEXT_SPRITE, this.spriteDef.RESTART,
this.dimensions);
} else {
this.gameOverPanel.draw();
}
if (this.distanceRan > this.highestScore) {
this.highestScore = Math.ceil(this.distanceRan);
this.distanceMeter.setHighScore(this.highestScore);
window.localStorage.setItem('chrome-dino', this.highestScore);
}
this.time = getTimeStamp();
},
stop: function() {
this.playing = false;
this.paused = true;
cancelAnimationFrame(this.raqId);
this.raqId = 0;
},
play: function() {
if(!this.crashed) {
this.playing = true;
this.paused = false;
this.tRex.update(0, Trex.status.RUNNING);
this.time = getTimeStamp();
this.update();
}
},
restart: function() {
if(!this.raqId) {
this.playCount++;
this.runningTime = 0;
this.playing = true;
this.crashed = false;
this.distanceRan = 0;
this.setSpeed(this.config.SPEED);
this.time = getTimeStamp();
this.containerEl.classList.remove(Runner.classes.CRASHED);
this.clearCanvas();
this.distanceMeter.reset();
this.horizon.reset();
this.tRex.reset();
this.playSound(this.soundFx.BUTTON_PRESS);
this.invert(true);
this.update();
}
},
setArcadeMode() {
document.body.classList.add(Runner.classes.ARCADE_MODE);
this.setArcadeModeContainerScale();
},
setArcadeModeContainerScale() {
const windowHeight = window.innerHeight;
const scaleHeight = windowHeight / this.dimensions.HEIGHT;
const scaleWidth = window.innerWidth / this.dimensions.WIDTH;
const scale = Math.max(1, Math.min(scaleHeight, scaleWidth));
const scaledCanvasHeight = this.dimensions.HEIGHT * scale;
const translateY = Math.ceil(Math.max(0, (windowHeight - scaledCanvasHeight -
Runner.config.ARCADE_MODE_INITIAL_TOP_POSITION) *
Runner.config.ARCADE_MODE_TOP_POSITION_PERCENT)) *
window.devicePixelRatio;
this.containerEl.style.transform =
'scale(' + scale + ') translateY(' + translateY + 'px)';
},
onVisibilityChange: function(e) {
if(document.hidden || document.webkitHidden || e.type == 'blur' ||
document.visibilityState != 'visible') {
this.stop();
} else if(!this.crashed) {
this.tRex.reset();
this.play();
}
},
playSound: function(soundBuffer) {
if(soundBuffer) {
var sourceNode = this.audioContext.createBufferSource();
sourceNode.buffer = soundBuffer;
sourceNode.connect(this.audioContext.destination);
sourceNode.start(0);
}
},
invert: function(reset) {
if(reset) {
document.body.classList.toggle(Runner.classes.INVERTED, false);
this.invertTimer = 0;
this.inverted = false;
} else {
this.inverted = document.body.classList.toggle(Runner.classes.INVERTED,
this.invertTrigger);
}
}
};
Runner.updateCanvasScaling = function(canvas, opt_width, opt_height) {
var context = canvas.getContext('2d');
var devicePixelRatio = Math.floor(window.devicePixelRatio) || 1;
var backingStoreRatio = Math.floor(context.webkitBackingStorePixelRatio) || 1;
var ratio = devicePixelRatio / backingStoreRatio;
if(devicePixelRatio !== backingStoreRatio) {
var oldWidth = opt_width || canvas.width;
var oldHeight = opt_height || canvas.height;
canvas.width = oldWidth * ratio;
canvas.height = oldHeight * ratio;
canvas.style.width = oldWidth + 'px';
canvas.style.height = oldHeight + 'px';
context.scale(ratio, ratio);
return true;
} else if(devicePixelRatio == 1) {
canvas.style.width = canvas.width + 'px';
canvas.style.height = canvas.height + 'px';
}
return false;
};
function getRandomNum(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
function vibrate(duration) {
if(IS_MOBILE && window.navigator.vibrate) {
window.navigator.vibrate(duration);
}
}
function createCanvas(container, width, height, opt_classname) {
var canvas = document.createElement('canvas');
canvas.className = opt_classname ? Runner.classes.CANVAS + ' ' +
opt_classname : Runner.classes.CANVAS;
canvas.width = width;
canvas.height = height;
container.appendChild(canvas);
return canvas;
}
function decodeBase64ToArrayBuffer(base64String) {
var len = (base64String.length / 4) * 3;
var str = atob(base64String);
var arrayBuffer = new ArrayBuffer(len);
var bytes = new Uint8Array(arrayBuffer);
for(var i = 0; i < len; i++) {
bytes[i] = str.charCodeAt(i);
}
return bytes.buffer;
}
function getTimeStamp() {
return IS_IOS ? new Date().getTime() : performance.now();
}
function GameOverPanel(canvas, textImgPos, restartImgPos, dimensions) {
this.canvas = canvas;
this.canvasCtx = canvas.getContext('2d');
this.canvasDimensions = dimensions;
this.textImgPos = textImgPos;
this.restartImgPos = restartImgPos;
this.draw();
}
GameOverPanel.dimensions = {
TEXT_X: 0,
TEXT_Y: 13,
TEXT_WIDTH: 191,
TEXT_HEIGHT: 11,
RESTART_WIDTH: 36,
RESTART_HEIGHT: 32
};
GameOverPanel.prototype = {
updateDimensions: function(width, opt_height) {
this.canvasDimensions.WIDTH = width;
if(opt_height) {
this.canvasDimensions.HEIGHT = opt_height;
}
},
draw: function() {
var dimensions = GameOverPanel.dimensions;
var centerX = this.canvasDimensions.WIDTH / 2;
var textSourceX = dimensions.TEXT_X;
var textSourceY = dimensions.TEXT_Y;
var textSourceWidth = dimensions.TEXT_WIDTH;
var textSourceHeight = dimensions.TEXT_HEIGHT;
var textTargetX = Math.round(centerX - (dimensions.TEXT_WIDTH / 2));
var textTargetY = Math.round((this.canvasDimensions.HEIGHT - 25) / 3);
var textTargetWidth = dimensions.TEXT_WIDTH;
var textTargetHeight = dimensions.TEXT_HEIGHT;
var restartSourceWidth = dimensions.RESTART_WIDTH;
var restartSourceHeight = dimensions.RESTART_HEIGHT;
var restartTargetX = centerX - (dimensions.RESTART_WIDTH / 2);
var restartTargetY = this.canvasDimensions.HEIGHT / 2;
if(IS_HIDPI) {
textSourceY *= 2;
textSourceX *= 2;
textSourceWidth *= 2;
textSourceHeight *= 2;
restartSourceWidth *= 2;
restartSourceHeight *= 2;
}
textSourceX += this.textImgPos.x;
textSourceY += this.textImgPos.y;
this.canvasCtx.drawImage(Runner.imageSprite,
textSourceX, textSourceY, textSourceWidth, textSourceHeight,
textTargetX, textTargetY, textTargetWidth, textTargetHeight);
this.canvasCtx.drawImage(Runner.imageSprite,
this.restartImgPos.x, this.restartImgPos.y,
restartSourceWidth, restartSourceHeight,
restartTargetX, restartTargetY, dimensions.RESTART_WIDTH,
dimensions.RESTART_HEIGHT);
}
};
function checkForCollision(obstacle, tRex, opt_canvasCtx) {
var obstacleBoxXPos = Runner.defaultDimensions.WIDTH + obstacle.xPos;
var tRexBox = new CollisionBox(
tRex.xPos + 1,
tRex.yPos + 1,
tRex.config.WIDTH - 2,
tRex.config.HEIGHT - 2);
var obstacleBox = new CollisionBox(
obstacle.xPos + 1,
obstacle.yPos + 1,
obstacle.typeConfig.width * obstacle.size - 2,
obstacle.typeConfig.height - 2);
if(opt_canvasCtx) {
drawCollisionBoxes(opt_canvasCtx, tRexBox, obstacleBox);
}
if(boxCompare(tRexBox, obstacleBox)) {
var collisionBoxes = obstacle.collisionBoxes;
var tRexCollisionBoxes = tRex.ducking ?
Trex.collisionBoxes.DUCKING : Trex.collisionBoxes.RUNNING;
for(var t = 0; t < tRexCollisionBoxes.length; t++) {
for(var i = 0; i < collisionBoxes.length; i++) {
var adjTrexBox =
createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);
var adjObstacleBox =
createAdjustedCollisionBox(collisionBoxes[i], obstacleBox);
var crashed = boxCompare(adjTrexBox, adjObstacleBox);
if(opt_canvasCtx) {
drawCollisionBoxes(opt_canvasCtx, adjTrexBox, adjObstacleBox);
}
if(crashed) {
return [adjTrexBox, adjObstacleBox];
}
}
}
}
return false;
}
function createAdjustedCollisionBox(box, adjustment) {
return new CollisionBox(
box.x + adjustment.x,
box.y + adjustment.y,
box.width,
box.height);
}
function drawCollisionBoxes(canvasCtx, tRexBox, obstacleBox) {
canvasCtx.save();
canvasCtx.strokeStyle = '#f00';
canvasCtx.strokeRect(tRexBox.x, tRexBox.y, tRexBox.width, tRexBox.height);
canvasCtx.strokeStyle = '#0f0';
canvasCtx.strokeRect(obstacleBox.x, obstacleBox.y,
obstacleBox.width, obstacleBox.height);
canvasCtx.restore();
}
function boxCompare(tRexBox, obstacleBox) {
var crashed = false;
var tRexBoxX = tRexBox.x;
var tRexBoxY = tRexBox.y;
var obstacleBoxX = obstacleBox.x;
var obstacleBoxY = obstacleBox.y;
if(tRexBox.x < obstacleBoxX + obstacleBox.width &&
tRexBox.x + tRexBox.width > obstacleBoxX &&
tRexBox.y < obstacleBox.y + obstacleBox.height &&
tRexBox.height + tRexBox.y > obstacleBox.y) {
crashed = true;
}
return crashed;
}
function CollisionBox(x, y, w, h) {
this.x = x;
this.y = y;
this.width = w;
this.height = h;
}
function Obstacle(canvasCtx, type, spriteImgPos, dimensions,
gapCoefficient, speed, opt_xOffset) {
this.canvasCtx = canvasCtx;
this.spritePos = spriteImgPos;
this.typeConfig = type;
this.gapCoefficient = gapCoefficient;
this.size = getRandomNum(1, Obstacle.MAX_OBSTACLE_LENGTH);
this.dimensions = dimensions;
this.remove = false;
this.xPos = dimensions.WIDTH + (opt_xOffset || 0);
this.yPos = 0;
this.width = 0;
this.collisionBoxes = [];
this.gap = 0;
this.speedOffset = 0;
this.currentFrame = 0;
this.timer = 0;
this.init(speed);
}
Obstacle.MAX_GAP_COEFFICIENT = 1.5;
Obstacle.MAX_OBSTACLE_LENGTH = 3,
Obstacle.prototype = {
init: function(speed) {
this.cloneCollisionBoxes();
if(this.size > 1 && this.typeConfig.multipleSpeed > speed) {
this.size = 1;
}
this.width = this.typeConfig.width * this.size;
if(Array.isArray(this.typeConfig.yPos)) {
var yPosConfig = IS_MOBILE ? this.typeConfig.yPosMobile :
this.typeConfig.yPos;
this.yPos = yPosConfig[getRandomNum(0, yPosConfig.length - 1)];
} else {
this.yPos = this.typeConfig.yPos;
}
this.draw();
if(this.size > 1) {
this.collisionBoxes[1].width = this.width - this.collisionBoxes[0].width -
this.collisionBoxes[2].width;
this.collisionBoxes[2].x = this.width - this.collisionBoxes[2].width;
}
if(this.typeConfig.speedOffset) {
this.speedOffset = Math.random() > 0.5 ? this.typeConfig.speedOffset :
-this.typeConfig.speedOffset;
}
this.gap = this.getGap(this.gapCoefficient, speed);
},
draw: function() {
var sourceWidth = this.typeConfig.width;
var sourceHeight = this.typeConfig.height;
if(IS_HIDPI) {
sourceWidth = sourceWidth * 2;
sourceHeight = sourceHeight * 2;
}
var sourceX = (sourceWidth * this.size) * (0.5 * (this.size - 1)) +
this.spritePos.x;
if(this.currentFrame > 0) {
sourceX += sourceWidth * this.currentFrame;
}
this.canvasCtx.drawImage(Runner.imageSprite,
sourceX, this.spritePos.y,
sourceWidth * this.size, sourceHeight,
this.xPos, this.yPos,
this.typeConfig.width * this.size, this.typeConfig.height);
},
update: function(deltaTime, speed) {
if(!this.remove) {
if(this.typeConfig.speedOffset) {
speed += this.speedOffset;
}
this.xPos -= Math.floor((speed * FPS / 1000) * deltaTime);
if(this.typeConfig.numFrames) {
this.timer += deltaTime;
if(this.timer >= this.typeConfig.frameRate) {
this.currentFrame =
this.currentFrame == this.typeConfig.numFrames - 1 ?
0 : this.currentFrame + 1;
this.timer = 0;
}
}
this.draw();
if(!this.isVisible()) {
this.remove = true;
}
}
},
getGap: function(gapCoefficient, speed) {
var minGap = Math.round(this.width * speed +
this.typeConfig.minGap * gapCoefficient);
var maxGap = Math.round(minGap * Obstacle.MAX_GAP_COEFFICIENT);
return getRandomNum(minGap, maxGap);
},
isVisible: function() {
return this.xPos + this.width > 0;
},
cloneCollisionBoxes: function() {
var collisionBoxes = this.typeConfig.collisionBoxes;
for(var i = collisionBoxes.length - 1; i >= 0; i--) {
this.collisionBoxes[i] = new CollisionBox(collisionBoxes[i].x,
collisionBoxes[i].y, collisionBoxes[i].width,
collisionBoxes[i].height);
}
}
};
Obstacle.types = [{
type: 'CACTUS_SMALL',
width: 17,
height: 35,
yPos: 105,
multipleSpeed: 4,
minGap: 120,
minSpeed: 0,
collisionBoxes: [
new CollisionBox(0, 7, 5, 27),
new CollisionBox(4, 0, 6, 34),
new CollisionBox(10, 4, 7, 14)
]
},
{
type: 'CACTUS_LARGE',
width: 25,
height: 50,
yPos: 90,
multipleSpeed: 7,
minGap: 120,
minSpeed: 0,
collisionBoxes: [
new CollisionBox(0, 12, 7, 38),
new CollisionBox(8, 0, 7, 49),
new CollisionBox(13, 10, 10, 38)
]
},
{
type: 'PTERODACTYL',
width: 46,
height: 40,
yPos: [100, 75, 50],
yPosMobile: [100, 50],
multipleSpeed: 999,
minSpeed: 8.5,
minGap: 150,
collisionBoxes: [
new CollisionBox(15, 15, 16, 5),
new CollisionBox(18, 21, 24, 6),
new CollisionBox(2, 14, 4, 3),
new CollisionBox(6, 10, 4, 7),
new CollisionBox(10, 8, 6, 9)
],
numFrames: 2,
frameRate: 1000 / 6,
speedOffset: .8
}
];
function Trex(canvas, spritePos) {
this.canvas = canvas;
this.canvasCtx = canvas.getContext('2d');
this.spritePos = spritePos;
this.xPos = 0;
this.yPos = 0;
this.xInitialPos = 0;
this.groundYPos = 0;
this.currentFrame = 0;
this.currentAnimFrames = [];
this.blinkDelay = 0;
this.blinkCount = 0;
this.animStartTime = 0;
this.timer = 0;
this.msPerFrame = 1000 / FPS;
this.config = Trex.config;
this.status = Trex.status.WAITING;
this.jumping = false;
this.ducking = false;
this.jumpVelocity = 0;
this.reachedMinHeight = false;
this.speedDrop = false;
this.jumpCount = 0;
this.jumpspotX = 0;
this.init();
}
Trex.config = {
DROP_VELOCITY: -5,
GRAVITY: 0.6,
HEIGHT: 47,
HEIGHT_DUCK: 25,
INITIAL_JUMP_VELOCITY: -10,
INTRO_DURATION: 1500,
MAX_JUMP_HEIGHT: 30,
MIN_JUMP_HEIGHT: 30,
SPEED_DROP_COEFFICIENT: 3,
SPRITE_WIDTH: 262,
START_X_POS: 50,
WIDTH: 44,
WIDTH_DUCK: 59
};
Trex.collisionBoxes = {
DUCKING: [
new CollisionBox(1, 18, 55, 25)
],
RUNNING: [
new CollisionBox(22, 0, 17, 16),
new CollisionBox(1, 18, 30, 9),
new CollisionBox(10, 35, 14, 8),
new CollisionBox(1, 24, 29, 5),
new CollisionBox(5, 30, 21, 4),
new CollisionBox(9, 34, 15, 4)
]
};
Trex.status = {
CRASHED: 'CRASHED',
DUCKING: 'DUCKING',
JUMPING: 'JUMPING',
RUNNING: 'RUNNING',
WAITING: 'WAITING'
};
Trex.BLINK_TIMING = 7000;
Trex.animFrames = {
WAITING: {
frames: [44, 0],
msPerFrame: 1000 / 3
},
RUNNING: {
frames: [88, 132],
msPerFrame: 1000 / 12
},
CRASHED: {
frames: [220],
msPerFrame: 1000 / 60
},
JUMPING: {
frames: [0],
msPerFrame: 1000 / 60
},
DUCKING: {
frames: [264, 323],
msPerFrame: 1000 / 8
}
};
Trex.prototype = {
init: function() {
this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -
Runner.config.BOTTOM_PAD;
this.yPos = this.groundYPos;
this.minJumpHeight = this.groundYPos - this.config.MIN_JUMP_HEIGHT;
this.draw(0, 0);
this.update(0, Trex.status.WAITING);
},
setJumpVelocity: function(setting) {
this.config.INITIAL_JUMP_VELOCITY = -setting;
this.config.DROP_VELOCITY = -setting / 2;
},
update: function(deltaTime, opt_status) {
this.timer += deltaTime;
if(opt_status) {
this.status = opt_status;
this.currentFrame = 0;
this.msPerFrame = Trex.animFrames[opt_status].msPerFrame;
this.currentAnimFrames = Trex.animFrames[opt_status].frames;
if(opt_status == Trex.status.WAITING) {
this.animStartTime = getTimeStamp();
this.setBlinkDelay();
}
}
if(this.playingIntro && this.xPos < this.config.START_X_POS) {
this.xPos += Math.round((this.config.START_X_POS /
this.config.INTRO_DURATION) * deltaTime);
this.xInitialPos = this.xPos;
}
if(this.status == Trex.status.WAITING) {
this.blink(getTimeStamp());
} else {
this.draw(this.currentAnimFrames[this.currentFrame], 0);
}
if(this.timer >= this.msPerFrame) {
this.currentFrame = this.currentFrame ==
this.currentAnimFrames.length - 1 ? 0 : this.currentFrame + 1;
this.timer = 0;
}
if(this.speedDrop && this.yPos == this.groundYPos) {
this.speedDrop = false;
this.setDuck(true);
}
},
draw: function(x, y) {
var sourceX = x;
var sourceY = y;
var sourceWidth = this.ducking && this.status != Trex.status.CRASHED ?
this.config.WIDTH_DUCK : this.config.WIDTH;
var sourceHeight = this.config.HEIGHT;
if(IS_HIDPI) {
sourceX *= 2;
sourceY *= 2;
sourceWidth *= 2;
sourceHeight *= 2;
}
sourceX += this.spritePos.x;
sourceY += this.spritePos.y;
if(this.ducking && this.status != Trex.status.CRASHED) {
this.canvasCtx.drawImage(Runner.imageSprite, sourceX, sourceY,
sourceWidth, sourceHeight,
this.xPos, this.yPos,
this.config.WIDTH_DUCK, this.config.HEIGHT);
} else {
if(this.ducking && this.status == Trex.status.CRASHED) {
this.xPos++;
}
this.canvasCtx.drawImage(Runner.imageSprite, sourceX, sourceY,
sourceWidth, sourceHeight,
this.xPos, this.yPos,
this.config.WIDTH, this.config.HEIGHT);
}
},
setBlinkDelay: function() {
this.blinkDelay = Math.ceil(Math.random() * Trex.BLINK_TIMING);
},
blink: function(time) {
var deltaTime = time - this.animStartTime;
if(deltaTime >= this.blinkDelay) {
this.draw(this.currentAnimFrames[this.currentFrame], 0);
if(this.currentFrame == 1) {
this.setBlinkDelay();
this.animStartTime = time;
this.blinkCount++;
}
}
},
startJump: function(speed) {
if(!this.jumping) {
this.update(0, Trex.status.JUMPING);
this.jumpVelocity = this.config.INITIAL_JUMP_VELOCITY - (speed / 10);
this.jumping = true;
this.reachedMinHeight = false;
this.speedDrop = false;
}
},
endJump: function() {
if(this.reachedMinHeight &&
this.jumpVelocity < this.config.DROP_VELOCITY) {
this.jumpVelocity = this.config.DROP_VELOCITY;
}
},
updateJump: function(deltaTime, speed) {
var msPerFrame = Trex.animFrames[this.status].msPerFrame;
var framesElapsed = deltaTime / msPerFrame;
if(this.speedDrop) {
this.yPos += Math.round(this.jumpVelocity *
this.config.SPEED_DROP_COEFFICIENT * framesElapsed);
} else {
this.yPos += Math.round(this.jumpVelocity * framesElapsed);
}
this.jumpVelocity += this.config.GRAVITY * framesElapsed;
if(this.yPos < this.minJumpHeight || this.speedDrop) {
this.reachedMinHeight = true;
}
if(this.yPos < this.config.MAX_JUMP_HEIGHT || this.speedDrop) {
this.endJump();
}
if(this.yPos > this.groundYPos) {
this.reset();
this.jumpCount++;
}
this.update(deltaTime);
},
setSpeedDrop: function() {
this.speedDrop = true;
this.jumpVelocity = 1;
},
setDuck: function(isDucking) {
if(isDucking && this.status != Trex.status.DUCKING) {
this.update(0, Trex.status.DUCKING);
this.ducking = true;
} else if(this.status == Trex.status.DUCKING) {
this.update(0, Trex.status.RUNNING);
this.ducking = false;
}
},
reset: function() {
this.xPos = this.xInitialPos;
this.yPos = this.groundYPos;
this.jumpVelocity = 0;
this.jumping = false;
this.ducking = false;
this.update(0, Trex.status.RUNNING);
this.midair = false;
this.speedDrop = false;
this.jumpCount = 0;
}
};
function DistanceMeter(canvas, spritePos, canvasWidth) {
this.canvas = canvas;
this.canvasCtx = canvas.getContext('2d');
this.image = Runner.imageSprite;
this.spritePos = spritePos;
this.x = 0;
this.y = 5;
this.currentDistance = 0;
this.maxScore = 0;
this.highScore = 0;
this.container = null;
this.digits = [];
this.achievement = false;
this.defaultString = '';
this.flashTimer = 0;
this.flashIterations = 0;
this.invertTrigger = false;
this.config = DistanceMeter.config;
this.maxScoreUnits = this.config.MAX_DISTANCE_UNITS;
this.init(canvasWidth);
}
DistanceMeter.dimensions = {
WIDTH: 10,
HEIGHT: 13,
DEST_WIDTH: 11
};
DistanceMeter.yPos = [0, 13, 27, 40, 53, 67, 80, 93, 107, 120];
DistanceMeter.config = {
MAX_DISTANCE_UNITS: 5,
ACHIEVEMENT_DISTANCE: 100,
COEFFICIENT: 0.025,
FLASH_DURATION: 1000 / 4,
FLASH_ITERATIONS: 3
};
DistanceMeter.prototype = {
init: function(width) {
var maxDistanceStr = '';
this.calcXPos(width);
this.maxScore = this.maxScoreUnits;
for(var i = 0; i < this.maxScoreUnits; i++) {
this.draw(i, 0);
this.defaultString += '0';
maxDistanceStr += '9';
}
this.maxScore = parseInt(maxDistanceStr);
},
calcXPos: function(canvasWidth) {
this.x = canvasWidth - (DistanceMeter.dimensions.DEST_WIDTH *
(this.maxScoreUnits + 1));
},
draw: function(digitPos, value, opt_highScore) {
var sourceWidth = DistanceMeter.dimensions.WIDTH;
var sourceHeight = DistanceMeter.dimensions.HEIGHT;
var sourceX = DistanceMeter.dimensions.WIDTH * value;
var sourceY = 0;
var targetX = digitPos * DistanceMeter.dimensions.DEST_WIDTH;
var targetY = this.y;
var targetWidth = DistanceMeter.dimensions.WIDTH;
var targetHeight = DistanceMeter.dimensions.HEIGHT;
if(IS_HIDPI) {
sourceWidth *= 2;
sourceHeight *= 2;
sourceX *= 2;
}
sourceX += this.spritePos.x;
sourceY += this.spritePos.y;
this.canvasCtx.save();
if(opt_highScore) {
var highScoreX = this.x - (this.maxScoreUnits * 2) *
DistanceMeter.dimensions.WIDTH;
this.canvasCtx.translate(highScoreX, this.y);
} else {
this.canvasCtx.translate(this.x, this.y);
}
this.canvasCtx.drawImage(this.image, sourceX, sourceY,
sourceWidth, sourceHeight,
targetX, targetY,
targetWidth, targetHeight
);
this.canvasCtx.restore();
},
getActualDistance: function(distance) {
return distance ? Math.round(distance * this.config.COEFFICIENT) : 0;
},
update: function(deltaTime, distance) {
var paint = true;
var playSound = false;
if(!this.achievement) {
distance = this.getActualDistance(distance);
if(distance > this.maxScore && this.maxScoreUnits ==
this.config.MAX_DISTANCE_UNITS) {
this.maxScoreUnits++;
this.maxScore = parseInt(this.maxScore + '9');
} else {
this.distance = 0;
}
if(distance > 0) {
if(distance % this.config.ACHIEVEMENT_DISTANCE == 0) {
this.achievement = true;
this.flashTimer = 0;
playSound = true;
}
var distanceStr = (this.defaultString +
distance).substr(-this.maxScoreUnits);
this.digits = distanceStr.split('');
} else {
this.digits = this.defaultString.split('');
}
} else {
if(this.flashIterations <= this.config.FLASH_ITERATIONS) {
this.flashTimer += deltaTime;
if(this.flashTimer < this.config.FLASH_DURATION) {
paint = false;
} else if(this.flashTimer >
this.config.FLASH_DURATION * 2) {
this.flashTimer = 0;
this.flashIterations++;
}
} else {
this.achievement = false;
this.flashIterations = 0;
this.flashTimer = 0;
}
}
if(paint) {
for(var i = this.digits.length - 1; i >= 0; i--) {
this.draw(i, parseInt(this.digits[i]));
}
}
this.drawHighScore();
return playSound;
},
drawHighScore: function() {
this.canvasCtx.save();
this.canvasCtx.globalAlpha = .8;
for(var i = this.highScore.length - 1; i >= 0; i--) {
this.draw(i, parseInt(this.highScore[i], 10), true);
}
this.canvasCtx.restore();
},
setHighScore: function(distance) {
distance = this.getActualDistance(distance);
var highScoreStr = (this.defaultString +
distance).substr(-this.maxScoreUnits);
this.highScore = ['10', '11', ''].concat(highScoreStr.split(''));
},
reset: function() {
this.update(0);
this.achievement = false;
}
};
function Cloud(canvas, spritePos, containerWidth) {
this.canvas = canvas;
this.canvasCtx = this.canvas.getContext('2d');
this.spritePos = spritePos;
this.containerWidth = containerWidth;
this.xPos = containerWidth;
this.yPos = 0;
this.remove = false;
this.cloudGap = getRandomNum(Cloud.config.MIN_CLOUD_GAP,
Cloud.config.MAX_CLOUD_GAP);
this.init();
}
Cloud.config = {
HEIGHT: 14,
MAX_CLOUD_GAP: 400,
MAX_SKY_LEVEL: 30,
MIN_CLOUD_GAP: 100,
MIN_SKY_LEVEL: 71,
WIDTH: 46
};
Cloud.prototype = {
init: function() {
this.yPos = getRandomNum(Cloud.config.MAX_SKY_LEVEL,
Cloud.config.MIN_SKY_LEVEL);
this.draw();
},
draw: function() {
this.canvasCtx.save();
var sourceWidth = Cloud.config.WIDTH;
var sourceHeight = Cloud.config.HEIGHT;
if(IS_HIDPI) {
sourceWidth = sourceWidth * 2;
sourceHeight = sourceHeight * 2;
}
this.canvasCtx.drawImage(Runner.imageSprite, this.spritePos.x,
this.spritePos.y,
sourceWidth, sourceHeight,
this.xPos, this.yPos,
Cloud.config.WIDTH, Cloud.config.HEIGHT);
this.canvasCtx.restore();
},
update: function(speed) {
if(!this.remove) {
this.xPos -= Math.ceil(speed);
this.draw();
if(!this.isVisible()) {
this.remove = true;
}
}
},
isVisible: function() {
return this.xPos + Cloud.config.WIDTH > 0;
}
};
function NightMode(canvas, spritePos, containerWidth) {
this.spritePos = spritePos;
this.canvas = canvas;
this.canvasCtx = canvas.getContext('2d');
this.xPos = containerWidth - 50;
this.yPos = 30;
this.currentPhase = 0;
this.opacity = 0;
this.containerWidth = containerWidth;
this.stars = [];
this.drawStars = false;
this.placeStars();
}
NightMode.config = {
FADE_SPEED: 0.035,
HEIGHT: 40,
MOON_SPEED: 0.25,
NUM_STARS: 2,
STAR_SIZE: 9,
STAR_SPEED: 0.3,
STAR_MAX_Y: 70,
WIDTH: 20
};
NightMode.phases = [140, 120, 100, 60, 40, 20, 0];
NightMode.prototype = {
update: function(activated, delta) {
if(activated && this.opacity == 0) {
this.currentPhase++;
if(this.currentPhase >= NightMode.phases.length) {
this.currentPhase = 0;
}
}
if(activated && (this.opacity < 1 || this.opacity == 0)) {
this.opacity += NightMode.config.FADE_SPEED;
} else if(this.opacity > 0) {
this.opacity -= NightMode.config.FADE_SPEED;
}
if(this.opacity > 0) {
this.xPos = this.updateXPos(this.xPos, NightMode.config.MOON_SPEED);
if(this.drawStars) {
for(var i = 0; i < NightMode.config.NUM_STARS; i++) {
this.stars[i].x = this.updateXPos(this.stars[i].x,
NightMode.config.STAR_SPEED);
}
}
this.draw();
} else {
this.opacity = 0;
this.placeStars();
}
this.drawStars = true;
},
updateXPos: function(currentPos, speed) {
if(currentPos < -NightMode.config.WIDTH) {
currentPos = this.containerWidth;
} else {
currentPos -= speed;
}
return currentPos;
},
draw: function() {
var moonSourceWidth = this.currentPhase == 3 ? NightMode.config.WIDTH * 2 :
NightMode.config.WIDTH;
var moonSourceHeight = NightMode.config.HEIGHT;
var moonSourceX = this.spritePos.x + NightMode.phases[this.currentPhase];
var moonOutputWidth = moonSourceWidth;
var starSize = NightMode.config.STAR_SIZE;
var starSourceX = Runner.spriteDefinition.LDPI.STAR.x;
if(IS_HIDPI) {
moonSourceWidth *= 2;
moonSourceHeight *= 2;
moonSourceX = this.spritePos.x +
(NightMode.phases[this.currentPhase] * 2);
starSize *= 2;
starSourceX = Runner.spriteDefinition.HDPI.STAR.x;
}
this.canvasCtx.save();
this.canvasCtx.globalAlpha = this.opacity;
if(this.drawStars) {
for(var i = 0; i < NightMode.config.NUM_STARS; i++) {
this.canvasCtx.drawImage(Runner.imageSprite,
starSourceX, this.stars[i].sourceY, starSize, starSize,
Math.round(this.stars[i].x), this.stars[i].y,
NightMode.config.STAR_SIZE, NightMode.config.STAR_SIZE);
}
}
this.canvasCtx.drawImage(Runner.imageSprite, moonSourceX,
this.spritePos.y, moonSourceWidth, moonSourceHeight,
Math.round(this.xPos), this.yPos,
moonOutputWidth, NightMode.config.HEIGHT);
this.canvasCtx.globalAlpha = 1;
this.canvasCtx.restore();
},
placeStars: function() {
var segmentSize = Math.round(this.containerWidth /
NightMode.config.NUM_STARS);
for(var i = 0; i < NightMode.config.NUM_STARS; i++) {
this.stars[i] = {};
this.stars[i].x = getRandomNum(segmentSize * i, segmentSize * (i + 1));
this.stars[i].y = getRandomNum(0, NightMode.config.STAR_MAX_Y);
if(IS_HIDPI) {
this.stars[i].sourceY = Runner.spriteDefinition.HDPI.STAR.y +
NightMode.config.STAR_SIZE * 2 * i;
} else {
this.stars[i].sourceY = Runner.spriteDefinition.LDPI.STAR.y +
NightMode.config.STAR_SIZE * i;
}
}
},
reset: function() {
this.currentPhase = 0;
this.opacity = 0;
this.update(false);
}
};
function HorizonLine(canvas, spritePos) {
this.spritePos = spritePos;
this.canvas = canvas;
this.canvasCtx = canvas.getContext('2d');
this.sourceDimensions = {};
this.dimensions = HorizonLine.dimensions;
this.sourceXPos = [this.spritePos.x, this.spritePos.x +
this.dimensions.WIDTH
];
this.xPos = [];
this.yPos = 0;
this.bumpThreshold = 0.5;
this.setSourceDimensions();
this.draw();
}
HorizonLine.dimensions = {
WIDTH: 600,
HEIGHT: 12,
YPOS: 127
};
HorizonLine.prototype = {
setSourceDimensions: function() {
for(var dimension in HorizonLine.dimensions) {
if(IS_HIDPI) {
if(dimension != 'YPOS') {
this.sourceDimensions[dimension] =
HorizonLine.dimensions[dimension] * 2;
}
} else {
this.sourceDimensions[dimension] =
HorizonLine.dimensions[dimension];
}
this.dimensions[dimension] = HorizonLine.dimensions[dimension];
}
this.xPos = [0, HorizonLine.dimensions.WIDTH];
this.yPos = HorizonLine.dimensions.YPOS;
},
getRandomType: function() {
return Math.random() > this.bumpThreshold ? this.dimensions.WIDTH : 0;
},
draw: function() {
this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[0],
this.spritePos.y,
this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
this.xPos[0], this.yPos,
this.dimensions.WIDTH, this.dimensions.HEIGHT);
this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[1],
this.spritePos.y,
this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
this.xPos[1], this.yPos,
this.dimensions.WIDTH, this.dimensions.HEIGHT);
},
updateXPos: function(pos, increment) {
var line1 = pos;
var line2 = pos == 0 ? 1 : 0;
this.xPos[line1] -= increment;
this.xPos[line2] = this.xPos[line1] + this.dimensions.WIDTH;
if(this.xPos[line1] <= -this.dimensions.WIDTH) {
this.xPos[line1] += this.dimensions.WIDTH * 2;
this.xPos[line2] = this.xPos[line1] - this.dimensions.WIDTH;
this.sourceXPos[line1] = this.getRandomType() + this.spritePos.x;
}
},
update: function(deltaTime, speed) {
var increment = Math.floor(speed * (FPS / 1000) * deltaTime);
if(this.xPos[0] <= 0) {
this.updateXPos(0, increment);
} else {
this.updateXPos(1, increment);
}
this.draw();
},
reset: function() {
this.xPos[0] = 0;
this.xPos[1] = HorizonLine.dimensions.WIDTH;
}
};
function Horizon(canvas, spritePos, dimensions, gapCoefficient) {
this.canvas = canvas;
this.canvasCtx = this.canvas.getContext('2d');
this.config = Horizon.config;
this.dimensions = dimensions;
this.gapCoefficient = gapCoefficient;
this.obstacles = [];
this.obstacleHistory = [];
this.horizonOffsets = [0, 0];
this.cloudFrequency = this.config.CLOUD_FREQUENCY;
this.spritePos = spritePos;
this.nightMode = null;
this.clouds = [];
this.cloudSpeed = this.config.BG_CLOUD_SPEED;
this.horizonLine = null;
this.init();
}
Horizon.config = {
BG_CLOUD_SPEED: 0.2,
BUMPY_THRESHOLD: .3,
CLOUD_FREQUENCY: .5,
HORIZON_HEIGHT: 16,
MAX_CLOUDS: 6
};
Horizon.prototype = {
init: function() {
this.addCloud();
this.horizonLine = new HorizonLine(this.canvas, this.spritePos.HORIZON);
this.nightMode = new NightMode(this.canvas, this.spritePos.MOON,
this.dimensions.WIDTH);
},
update: function(deltaTime, currentSpeed, updateObstacles, showNightMode) {
this.runningTime += deltaTime;
this.horizonLine.update(deltaTime, currentSpeed);
this.nightMode.update(showNightMode);
this.updateClouds(deltaTime, currentSpeed);
if(updateObstacles) {
this.updateObstacles(deltaTime, currentSpeed);
}
},
updateClouds: function(deltaTime, speed) {
var cloudSpeed = this.cloudSpeed / 1000 * deltaTime * speed;
var numClouds = this.clouds.length;
if(numClouds) {
for(var i = numClouds - 1; i >= 0; i--) {
this.clouds[i].update(cloudSpeed);
}
var lastCloud = this.clouds[numClouds - 1];
if(numClouds < this.config.MAX_CLOUDS &&
(this.dimensions.WIDTH - lastCloud.xPos) > lastCloud.cloudGap &&
this.cloudFrequency > Math.random()) {
this.addCloud();
}
this.clouds = this.clouds.filter(function(obj) {
return !obj.remove;
});
} else {
this.addCloud();
}
},
updateObstacles: function(deltaTime, currentSpeed) {
var updatedObstacles = this.obstacles.slice(0);
for(var i = 0; i < this.obstacles.length; i++) {
var obstacle = this.obstacles[i];
obstacle.update(deltaTime, currentSpeed);
if(obstacle.remove) {
updatedObstacles.shift();
}
}
this.obstacles = updatedObstacles;
if(this.obstacles.length > 0) {
var lastObstacle = this.obstacles[this.obstacles.length - 1];
if(lastObstacle && !lastObstacle.followingObstacleCreated &&
lastObstacle.isVisible() &&
(lastObstacle.xPos + lastObstacle.width + lastObstacle.gap) <
this.dimensions.WIDTH) {
this.addNewObstacle(currentSpeed);
lastObstacle.followingObstacleCreated = true;
}
} else {
this.addNewObstacle(currentSpeed);
}
},
removeFirstObstacle: function() {
this.obstacles.shift();
},
addNewObstacle: function(currentSpeed) {
var obstacleTypeIndex = getRandomNum(0, Obstacle.types.length - 1);
var obstacleType = Obstacle.types[obstacleTypeIndex];
if(this.duplicateObstacleCheck(obstacleType.type) ||
currentSpeed < obstacleType.minSpeed) {
this.addNewObstacle(currentSpeed);
} else {
var obstacleSpritePos = this.spritePos[obstacleType.type];
this.obstacles.push(new Obstacle(this.canvasCtx, obstacleType,
obstacleSpritePos, this.dimensions,
this.gapCoefficient, currentSpeed, obstacleType.width));
this.obstacleHistory.unshift(obstacleType.type);
if(this.obstacleHistory.length > 1) {
this.obstacleHistory.splice(Runner.config.MAX_OBSTACLE_DUPLICATION);
}
}
},
duplicateObstacleCheck: function(nextObstacleType) {
var duplicateCount = 0;
for(var i = 0; i < this.obstacleHistory.length; i++) {
duplicateCount = this.obstacleHistory[i] == nextObstacleType ?
duplicateCount + 1 : 0;
}
return duplicateCount >= Runner.config.MAX_OBSTACLE_DUPLICATION;
},
reset: function() {
this.obstacles = [];
this.horizonLine.reset();
this.nightMode.reset();
},
resize: function(width, height) {
this.canvas.width = width;
this.canvas.height = height;
},
addCloud: function() {
this.clouds.push(new Cloud(this.canvas, this.spritePos.CLOUD,
this.dimensions.WIDTH));
}
};
function onDocumentLoad() {
new Runner('.interstitial-wrapper');
}
document.addEventListener('DOMContentLoaded', onDocumentLoad);
