chrome/renderer/resources/offline.js - Issue 1668963002: Componentize IDR_NET_ERROR_HTML for sharing it with iOS.

Unified Diff: chrome/renderer/resources/offline.js

Issue 1668963002: Componentize IDR_NET_ERROR_HTML for sharing it with iOS. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Created 4 years, 10 months ago

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Index: chrome/renderer/resources/offline.js

diff --git a/chrome/renderer/resources/offline.js b/chrome/renderer/resources/offline.js

deleted file mode 100644

index 21bd28663501b1067115f1787391b51a846e9529..0000000000000000000000000000000000000000

--- a/chrome/renderer/resources/offline.js

+++ /dev/null

@@ -1,2689 +0,0 @@

-// Use of this source code is governed by a BSD-style license that can be

-// found in the LICENSE file.

-(function() {

-'use strict';

-/**

- * T-Rex runner.

- * @param {string} outerContainerId Outer containing element id.

- * @param {Object} opt_config

- * @constructor

- * @export

- */

-function Runner(outerContainerId, opt_config) {

- // Singleton

- if (Runner.instance_) {

- return Runner.instance_;

- }

- Runner.instance_ = this;

- this.outerContainerEl = document.querySelector(outerContainerId);

- this.containerEl = null;

- this.snackbarEl = 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 = 0;

- this.time = 0;

- this.runningTime = 0;

- this.msPerFrame = 1000 / FPS;

- this.currentSpeed = this.config.SPEED;

- this.obstacles = [];

- this.started = false;

- this.activated = false;

- this.crashed = false;

- this.paused = false;

- this.inverted = false;

- this.invertTimer = 0;

- this.resizeTimerId_ = null;

- this.playCount = 0;

- // Sound FX.

- this.audioBuffer = null;

- this.soundFx = {};

- // Global web audio context for playing sounds.

- this.audioContext = null;

- // Images.

- this.images = {};

- this.imagesLoaded = 0;

- if (this.isDisabled()) {

- this.setupDisabledRunner();

- } else {

- this.loadImages();

- }

-window['Runner'] = Runner;

-/**

- * Default game width.

- * @const

- */

-var DEFAULT_WIDTH = 600;

-/**

- * Frames per second.

- * @const

- */

-var FPS = 60;

-/** @const */

-var IS_HIDPI = window.devicePixelRatio > 1;

-/** @const */

-var IS_IOS = window.navigator.userAgent.indexOf('CriOS') > -1 ||

- window.navigator.userAgent == 'UIWebViewForStaticFileContent';

-/** @const */

-var IS_MOBILE = window.navigator.userAgent.indexOf('Mobi') > -1 || IS_IOS;

-/** @const */

-var IS_TOUCH_ENABLED = 'ontouchstart' in window;

-/**

- * Default game configuration.

- * @enum {number}

- */

-Runner.config = {

- ACCELERATION: 0.001,

- BG_CLOUD_SPEED: 0.2,

- BOTTOM_PAD: 10,

- CLEAR_TIME: 3000,

- CLOUD_FREQUENCY: 0.5,

- GAMEOVER_CLEAR_TIME: 750,

- GAP_COEFFICIENT: 0.6,

- GRAVITY: 0.6,

- INITIAL_JUMP_VELOCITY: 12,

- INVERT_FADE_DURATION: 12000,

- INVERT_DISTANCE: 700,

- 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

-};

-/**

- * Default dimensions.

- * @enum {string}

- */

-Runner.defaultDimensions = {

- WIDTH: DEFAULT_WIDTH,

- HEIGHT: 150

-};

-/**

- * CSS class names.

- * @enum {string}

- */

-Runner.classes = {

- CANVAS: 'runner-canvas',

- CONTAINER: 'runner-container',

- CRASHED: 'crashed',

- ICON: 'icon-offline',

- INVERTED: 'inverted',

- SNACKBAR: 'snackbar',

- SNACKBAR_SHOW: 'snackbar-show',

- TOUCH_CONTROLLER: 'controller'

-};

-/**

- * Sprite definition layout of the spritesheet.

- * @enum {Object}

- */

-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}

- }

-};

-/**

- * Sound FX. Reference to the ID of the audio tag on interstitial page.

- * @enum {string}

- */

-Runner.sounds = {

- BUTTON_PRESS: 'offline-sound-press',

- HIT: 'offline-sound-hit',

- SCORE: 'offline-sound-reached'

-};

-/**

- * Key code mapping.

- * @enum {Object}

- */

-Runner.keycodes = {

- JUMP: {'38': 1, '32': 1}, // Up, spacebar

- DUCK: {'40': 1}, // Down

- RESTART: {'13': 1} // Enter

-};

-/**

- * Runner event names.

- * @enum {string}

- */

-Runner.events = {

- ANIM_END: 'webkitAnimationEnd',

- CLICK: 'click',

- KEYDOWN: 'keydown',

- KEYUP: 'keyup',

- MOUSEDOWN: 'mousedown',

- MOUSEUP: 'mouseup',

- RESIZE: 'resize',

- TOUCHEND: 'touchend',

- TOUCHSTART: 'touchstart',

- VISIBILITY: 'visibilitychange',

- BLUR: 'blur',

- FOCUS: 'focus',

- LOAD: 'load'

-};

-Runner.prototype = {

- /**

- * Whether the easter egg has been disabled. CrOS enterprise enrolled devices.

- * @return {boolean}

- */

- isDisabled: function() {

- return loadTimeData && loadTimeData.valueExists('disabledEasterEgg');

- },

- /**

- * For disabled instances, set up a snackbar with the disabled message.

- */

- setupDisabledRunner: function() {

- this.containerEl = document.createElement('div');

- this.containerEl.className = Runner.classes.SNACKBAR;

- this.containerEl.textContent = loadTimeData.getValue('disabledEasterEgg');

- this.outerContainerEl.appendChild(this.containerEl);

- // Show notification when the activation key is pressed.

- 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));

- },

- /**

- * Setting individual settings for debugging.

- * @param {string} setting

- * @param {*} value

- */

- 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;

- }

- },

- /**

- * Cache the appropriate image sprite from the page and get the sprite sheet

- * definition.

- */

- 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;

- }

- this.init();

- },

- /**

- * Load and decode base 64 encoded sounds.

- */

- 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);

- // Async, so no guarantee of order in array.

- this.audioContext.decodeAudioData(buffer, function(index, audioData) {

- this.soundFx[index] = audioData;

- }.bind(this, sound));

- }

- },

- /**

- * Sets the game speed. Adjust the speed accordingly if on a smaller screen.

- * @param {number} opt_speed

- */

- setSpeed: function(opt_speed) {

- var speed = opt_speed || this.currentSpeed;

- // Reduce the speed on smaller mobile screens.

- 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;

- }

- },

- /**

- * Game initialiser.

- */

- init: function() {

- // Hide the static icon.

- document.querySelector('.' + Runner.classes.ICON).style.visibility =

- 'hidden';

- this.adjustDimensions();

- this.setSpeed();

- this.containerEl = document.createElement('div');

- this.containerEl.className = Runner.classes.CONTAINER;

- // Player canvas 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);

- // Horizon contains clouds, obstacles and the ground.

- this.horizon = new Horizon(this.canvas, this.spriteDef, this.dimensions,

- this.config.GAP_COEFFICIENT);

- // Distance meter

- this.distanceMeter = new DistanceMeter(this.canvas,

- this.spriteDef.TEXT_SPRITE, this.dimensions.WIDTH);

- // Draw t-rex

- 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));

- },

- /**

- * Create the touch controller. A div that covers whole screen.

- */

- createTouchController: function() {

- this.touchController = document.createElement('div');

- this.touchController.className = Runner.classes.TOUCH_CONTROLLER;

- },

- /**

- * Debounce the resize event.

- */

- debounceResize: function() {

- if (!this.resizeTimerId_) {

- this.resizeTimerId_ =

- setInterval(this.adjustDimensions.bind(this), 250);

- }

- },

- /**

- * Adjust game space dimensions on resize.

- */

- 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;

- // Redraw the elements back onto the canvas.

- 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);

- // Outer container and distance meter.

- if (this.activated || 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);

- }

- // Game over panel.

- if (this.crashed && this.gameOverPanel) {

- this.gameOverPanel.updateDimensions(this.dimensions.WIDTH);

- this.gameOverPanel.draw();

- }

- },

- /**

- * Play the game intro.

- * Canvas container width expands out to the full width.

- */

- playIntro: function() {

- if (!this.started && !this.crashed) {

- this.playingIntro = true;

- this.tRex.playingIntro = true;

- // CSS animation definition.

- var keyframes = '@-webkit-keyframes intro { ' +

- 'from { width:' + Trex.config.WIDTH + 'px }' +

- 'to { width: ' + this.dimensions.WIDTH + 'px }' +

- '}';

- document.styleSheets[0].insertRule(keyframes, 0);

- 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';

- if (this.touchController) {

- this.outerContainerEl.appendChild(this.touchController);

- }

- this.activated = true;

- this.started = true;

- } else if (this.crashed) {

- this.restart();

- }

- },

- /**

- * Update the game status to started.

- */

- startGame: function() {

- this.runningTime = 0;

- this.playingIntro = false;

- this.tRex.playingIntro = false;

- this.containerEl.style.webkitAnimation = '';

- this.playCount++;

- // Handle tabbing off the page. Pause the current game.

- 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 the game frame.

- */

- update: function() {

- this.drawPending = false;

- var now = getTimeStamp();

- var deltaTime = now - (this.time || now);

- this.time = now;

- if (this.activated) {

- this.clearCanvas();

- if (this.tRex.jumping) {

- this.tRex.updateJump(deltaTime);

- }

- this.runningTime += deltaTime;

- var hasObstacles = this.runningTime > this.config.CLEAR_TIME;

- // First jump triggers the intro.

- if (this.tRex.jumpCount == 1 && !this.playingIntro) {

- this.playIntro();

- }

- // The horizon doesn't move until the intro is over.

- if (this.playingIntro) {

- this.horizon.update(0, this.currentSpeed, hasObstacles);

- } else {

- deltaTime = !this.started ? 0 : deltaTime;

- this.horizon.update(deltaTime, this.currentSpeed, hasObstacles,

- this.inverted);

- }

- // Check for collisions.

- 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);

- }

- // Night mode.

- 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.crashed) {

- this.tRex.update(deltaTime);

- this.raq();

- }

- },

- /**

- * Event handler.

- */

- handleEvent: function(e) {

- return (function(evtType, events) {

- switch (evtType) {

- case events.KEYDOWN:

- case events.TOUCHSTART:

- case events.MOUSEDOWN:

- this.onKeyDown(e);

- break;

- case events.KEYUP:

- case events.TOUCHEND:

- case events.MOUSEUP:

- this.onKeyUp(e);

- break;

- }

- }.bind(this))(e.type, Runner.events);

- },

- /**

- * Bind relevant key / mouse / touch listeners.

- */

- startListening: function() {

- // Keys.

- document.addEventListener(Runner.events.KEYDOWN, this);

- document.addEventListener(Runner.events.KEYUP, this);

- if (IS_MOBILE) {

- // Mobile only touch devices.

- this.touchController.addEventListener(Runner.events.TOUCHSTART, this);

- this.touchController.addEventListener(Runner.events.TOUCHEND, this);

- this.containerEl.addEventListener(Runner.events.TOUCHSTART, this);

- } else {

- // Mouse.

- document.addEventListener(Runner.events.MOUSEDOWN, this);

- document.addEventListener(Runner.events.MOUSEUP, this);

- }

- },

- /**

- * Remove all listeners.

- */

- stopListening: function() {

- document.removeEventListener(Runner.events.KEYDOWN, this);

- document.removeEventListener(Runner.events.KEYUP, this);

- if (IS_MOBILE) {

- this.touchController.removeEventListener(Runner.events.TOUCHSTART, this);

- this.touchController.removeEventListener(Runner.events.TOUCHEND, this);

- this.containerEl.removeEventListener(Runner.events.TOUCHSTART, this);

- } else {

- document.removeEventListener(Runner.events.MOUSEDOWN, this);

- document.removeEventListener(Runner.events.MOUSEUP, this);

- }

- },

- /**

- * Process keydown.

- * @param {Event} e

- */

- onKeyDown: function(e) {

- // Prevent native page scrolling whilst tapping on mobile.

- if (IS_MOBILE) {

- e.preventDefault();

- }

- if (e.target != this.detailsButton) {

- if (!this.crashed && (Runner.keycodes.JUMP[e.keyCode] ||

- e.type == Runner.events.TOUCHSTART)) {

- if (!this.activated) {

- this.loadSounds();

- this.activated = true;

- 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.activated && !this.crashed && Runner.keycodes.DUCK[e.keyCode]) {

- e.preventDefault();

- if (this.tRex.jumping) {

- // Speed drop, activated only when jump key is not pressed.

- this.tRex.setSpeedDrop();

- } else if (!this.tRex.jumping && !this.tRex.ducking) {

- // Duck.

- this.tRex.setDuck(true);

- }

- },

- /**

- * Process key up.

- * @param {Event} e

- */

- onKeyUp: function(e) {

- var keyCode = String(e.keyCode);

- var isjumpKey = Runner.keycodes.JUMP[keyCode] ||

- e.type == Runner.events.TOUCHEND ||

- e.type == Runner.events.MOUSEDOWN;

- 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) {

- // Check that enough time has elapsed before allowing jump key to restart.

- 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) {

- // Reset the jump state

- this.tRex.reset();

- this.play();

- }

- },

- /**

- * Returns whether the event was a left click on canvas.

- * On Windows right click is registered as a click.

- * @param {Event} e

- * @return {boolean}

- */

- isLeftClickOnCanvas: function(e) {

- return e.button != null && e.button < 2 &&

- e.type == Runner.events.MOUSEUP && e.target == this.canvas;

- },

- /**

- * RequestAnimationFrame wrapper.

- */

- raq: function() {

- if (!this.drawPending) {

- this.drawPending = true;

- this.raqId = requestAnimationFrame(this.update.bind(this));

- }

- },

- /**

- * Whether the game is running.

- * @return {boolean}

- */

- isRunning: function() {

- return !!this.raqId;

- },

- /**

- * Game over state.

- */

- gameOver: function() {

- this.playSound(this.soundFx.HIT);

- vibrate(200);

- this.stop();

- this.crashed = true;

- this.distanceMeter.acheivement = false;

- this.tRex.update(100, Trex.status.CRASHED);

- // Game over panel.

- if (!this.gameOverPanel) {

- this.gameOverPanel = new GameOverPanel(this.canvas,

- this.spriteDef.TEXT_SPRITE, this.spriteDef.RESTART,

- this.dimensions);

- } else {

- this.gameOverPanel.draw();

- }

- // Update the high score.

- if (this.distanceRan > this.highestScore) {

- this.highestScore = Math.ceil(this.distanceRan);

- this.distanceMeter.setHighScore(this.highestScore);

- }

- // Reset the time clock.

- this.time = getTimeStamp();

- },

- stop: function() {

- this.activated = false;

- this.paused = true;

- cancelAnimationFrame(this.raqId);

- this.raqId = 0;

- },

- play: function() {

- if (!this.crashed) {

- this.activated = 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.activated = 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.highestScore);

- this.horizon.reset();

- this.tRex.reset();

- this.playSound(this.soundFx.BUTTON_PRESS);

- this.invert(true);

- this.update();

- }

- },

- /**

- * Pause the game if the tab is not in focus.

- */

- 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();

- }

- },

- /**

- * Play a sound.

- * @param {SoundBuffer} soundBuffer

- */

- playSound: function(soundBuffer) {

- if (soundBuffer) {

- var sourceNode = this.audioContext.createBufferSource();

- sourceNode.buffer = soundBuffer;

- sourceNode.connect(this.audioContext.destination);

- sourceNode.start(0);

- }

- },

- /**

- * Inverts the current page / canvas colors.

- * @param {boolean} Whether to reset colors.

- */

- 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);

- }

-};

-/**

- * Updates the canvas size taking into

- * account the backing store pixel ratio and

- * the device pixel ratio.

- *

- * See article by Paul Lewis:

- * http://www.html5rocks.com/en/tutorials/canvas/hidpi/

- *

- * @param {HTMLCanvasElement} canvas

- * @param {number} opt_width

- * @param {number} opt_height

- * @return {boolean} Whether the canvas was scaled.

- */

-Runner.updateCanvasScaling = function(canvas, opt_width, opt_height) {

- var context = canvas.getContext('2d');

- // Query the various pixel ratios

- var devicePixelRatio = Math.floor(window.devicePixelRatio) || 1;

- var backingStoreRatio = Math.floor(context.webkitBackingStorePixelRatio) || 1;

- var ratio = devicePixelRatio / backingStoreRatio;

- // Upscale the canvas if the two ratios don't match

- 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';

- // Scale the context to counter the fact that we've manually scaled

- // our canvas element.

- context.scale(ratio, ratio);

- return true;

- } else if (devicePixelRatio == 1) {

- // Reset the canvas width / height. Fixes scaling bug when the page is

- // zoomed and the devicePixelRatio changes accordingly.

- canvas.style.width = canvas.width + 'px';

- canvas.style.height = canvas.height + 'px';

- }

- return false;

-};

-/**

- * Get random number.

- * @param {number} min

- * @param {number} max

- * @param {number}

- */

-function getRandomNum(min, max) {

- return Math.floor(Math.random() * (max - min + 1)) + min;

-/**

- * Vibrate on mobile devices.

- * @param {number} duration Duration of the vibration in milliseconds.

- */

-function vibrate(duration) {

- if (IS_MOBILE && window.navigator.vibrate) {

- window.navigator.vibrate(duration);

- }

-/**

- * Create canvas element.

- * @param {HTMLElement} container Element to append canvas to.

- * @param {number} width

- * @param {number} height

- * @param {string} opt_classname

- * @return {HTMLCanvasElement}

- */

-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;

-/**

- * Decodes the base 64 audio to ArrayBuffer used by Web Audio.

- * @param {string} base64String

- */

-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;

-/**

- * Return the current timestamp.

- * @return {number}

- */

-function getTimeStamp() {

- return IS_IOS ? new Date().getTime() : performance.now();

-//******************************************************************************

-/**

- * Game over panel.

- * @param {!HTMLCanvasElement} canvas

- * @param {Object} textImgPos

- * @param {Object} restartImgPos

- * @param {!Object} dimensions Canvas dimensions.

- * @constructor

- */

-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();

-};

-/**

- * Dimensions used in the panel.

- * @enum {number}

- */

-GameOverPanel.dimensions = {

- TEXT_X: 0,

- TEXT_Y: 13,

- TEXT_WIDTH: 191,

- TEXT_HEIGHT: 11,

- RESTART_WIDTH: 36,

- RESTART_HEIGHT: 32

-};

-GameOverPanel.prototype = {

- /**

- * Update the panel dimensions.

- * @param {number} width New canvas width.

- * @param {number} opt_height Optional new canvas height.

- */

- updateDimensions: function(width, opt_height) {

- this.canvasDimensions.WIDTH = width;

- if (opt_height) {

- this.canvasDimensions.HEIGHT = opt_height;

- }

- },

- /**

- * Draw the panel.

- */

- draw: function() {

- var dimensions = GameOverPanel.dimensions;

- var centerX = this.canvasDimensions.WIDTH / 2;

- // Game over text.

- 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;

- // Game over text from sprite.

- this.canvasCtx.drawImage(Runner.imageSprite,

- textSourceX, textSourceY, textSourceWidth, textSourceHeight,

- textTargetX, textTargetY, textTargetWidth, textTargetHeight);

- // Restart button.

- this.canvasCtx.drawImage(Runner.imageSprite,

- this.restartImgPos.x, this.restartImgPos.y,

- restartSourceWidth, restartSourceHeight,

- restartTargetX, restartTargetY, dimensions.RESTART_WIDTH,

- dimensions.RESTART_HEIGHT);

- }

-};

-//******************************************************************************

-/**

- * Check for a collision.

- * @param {!Obstacle} obstacle

- * @param {!Trex} tRex T-rex object.

- * @param {HTMLCanvasContext} opt_canvasCtx Optional canvas context for drawing

- * collision boxes.

- * @return {Array<CollisionBox>}

- */

-function checkForCollision(obstacle, tRex, opt_canvasCtx) {

- var obstacleBoxXPos = Runner.defaultDimensions.WIDTH + obstacle.xPos;

- // Adjustments are made to the bounding box as there is a 1 pixel white

- // border around the t-rex and obstacles.

- 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);

- // Debug outer box

- if (opt_canvasCtx) {

- drawCollisionBoxes(opt_canvasCtx, tRexBox, obstacleBox);

- }

- // Simple outer bounds check.

- if (boxCompare(tRexBox, obstacleBox)) {

- var collisionBoxes = obstacle.collisionBoxes;

- var tRexCollisionBoxes = tRex.ducking ?

- Trex.collisionBoxes.DUCKING : Trex.collisionBoxes.RUNNING;

- // Detailed axis aligned box check.

- for (var t = 0; t < tRexCollisionBoxes.length; t++) {

- for (var i = 0; i < collisionBoxes.length; i++) {

- // Adjust the box to actual positions.

- var adjTrexBox =

- createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);

- var adjObstacleBox =

- createAdjustedCollisionBox(collisionBoxes[i], obstacleBox);

- var crashed = boxCompare(adjTrexBox, adjObstacleBox);

- // Draw boxes for debug.

- if (opt_canvasCtx) {

- drawCollisionBoxes(opt_canvasCtx, adjTrexBox, adjObstacleBox);

- }

- if (crashed) {

- return [adjTrexBox, adjObstacleBox];

- }

- return false;

-};

-/**

- * Adjust the collision box.

- * @param {!CollisionBox} box The original box.

- * @param {!CollisionBox} adjustment Adjustment box.

- * @return {CollisionBox} The adjusted collision box object.

- */

-function createAdjustedCollisionBox(box, adjustment) {

- return new CollisionBox(

- box.x + adjustment.x,

- box.y + adjustment.y,

- box.width,

- box.height);

-};

-/**

- * Draw the collision boxes for debug.

- */

-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();

-};

-/**

- * Compare two collision boxes for a collision.

- * @param {CollisionBox} tRexBox

- * @param {CollisionBox} obstacleBox

- * @return {boolean} Whether the boxes intersected.

- */

-function boxCompare(tRexBox, obstacleBox) {

- var crashed = false;

- var tRexBoxX = tRexBox.x;

- var tRexBoxY = tRexBox.y;

- var obstacleBoxX = obstacleBox.x;

- var obstacleBoxY = obstacleBox.y;

- // Axis-Aligned Bounding Box method.

- 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;

-};

-//******************************************************************************

-/**

- * Collision box object.

- * @param {number} x X position.

- * @param {number} y Y Position.

- * @param {number} w Width.

- * @param {number} h Height.

- */

-function CollisionBox(x, y, w, h) {

- this.x = x;

- this.y = y;

- this.width = w;

- this.height = h;

-};

-//******************************************************************************

-/**

- * Obstacle.

- * @param {HTMLCanvasCtx} canvasCtx

- * @param {Obstacle.type} type

- * @param {Object} spritePos Obstacle position in sprite.

- * @param {Object} dimensions

- * @param {number} gapCoefficient Mutipler in determining the gap.

- * @param {number} speed

- * @param {number} opt_xOffset

- */

-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;

- // For animated obstacles.

- this.currentFrame = 0;

- this.timer = 0;

- this.init(speed);

-};

-/**

- * Coefficient for calculating the maximum gap.

- * @const

- */

-Obstacle.MAX_GAP_COEFFICIENT = 1.5;

-/**

- * Maximum obstacle grouping count.

- * @const

- */

-Obstacle.MAX_OBSTACLE_LENGTH = 3,

-Obstacle.prototype = {

- /**

- * Initialise the DOM for the obstacle.

- * @param {number} speed

- */

- init: function(speed) {

- this.cloneCollisionBoxes();

- // Only allow sizing if we're at the right speed.

- if (this.size > 1 && this.typeConfig.multipleSpeed > speed) {

- this.size = 1;

- }

- this.width = this.typeConfig.width * this.size;

- // Check if obstacle can be positioned at various heights.

- 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();

- // Make collision box adjustments,

- // Central box is adjusted to the size as one box.

- // ____ ______ ________

- // _| |-| _| |-| _| |-|

- // | |<->| | | |<--->| | | |<----->| |

- // | | 1 | | | | 2 | | | | 3 | |

- // |_|___|_| |_|_____|_| |_|_______|_|

- //

- 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;

- }

- // For obstacles that go at a different speed from the horizon.

- if (this.typeConfig.speedOffset) {

- this.speedOffset = Math.random() > 0.5 ? this.typeConfig.speedOffset :

- -this.typeConfig.speedOffset;

- }

- this.gap = this.getGap(this.gapCoefficient, speed);

- },

- /**

- * Draw and crop based on size.

- */

- draw: function() {

- var sourceWidth = this.typeConfig.width;

- var sourceHeight = this.typeConfig.height;

- if (IS_HIDPI) {

- sourceWidth = sourceWidth * 2;

- sourceHeight = sourceHeight * 2;

- }

- // X position in sprite.

- var sourceX = (sourceWidth * this.size) * (0.5 * (this.size - 1)) +

- this.spritePos.x;

- // Animation frames.

- 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);

- },

- /**

- * Obstacle frame update.

- * @param {number} deltaTime

- * @param {number} speed

- */

- update: function(deltaTime, speed) {

- if (!this.remove) {

- if (this.typeConfig.speedOffset) {

- speed += this.speedOffset;

- }

- this.xPos -= Math.floor((speed * FPS / 1000) * deltaTime);

- // Update frame

- 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;

- }

- },

- /**

- * Calculate a random gap size.

- * - Minimum gap gets wider as speed increses

- * @param {number} gapCoefficient

- * @param {number} speed

- * @return {number} The gap size.

- */

- 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);

- },

- /**

- * Check if obstacle is visible.

- * @return {boolean} Whether the obstacle is in the game area.

- */

- isVisible: function() {

- return this.xPos + this.width > 0;

- },

- /**

- * Make a copy of the collision boxes, since these will change based on

- * obstacle type and size.

- */

- 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 definitions.

- * minGap: minimum pixel space betweeen obstacles.

- * multipleSpeed: Speed at which multiples are allowed.

- * speedOffset: speed faster / slower than the horizon.

- * minSpeed: Minimum speed which the obstacle can make an appearance.

- */

-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 ], // Variable height.

- yPosMobile: [ 100, 50 ], // Variable height mobile.

- 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

- }

-];

-//******************************************************************************

-/**

- * T-rex game character.

- * @param {HTMLCanvas} canvas

- * @param {Object} spritePos Positioning within image sprite.

- * @constructor

- */

-function Trex(canvas, spritePos) {

- this.canvas = canvas;

- this.canvasCtx = canvas.getContext('2d');

- this.spritePos = spritePos;

- this.xPos = 0;

- this.yPos = 0;

- // Position when on the ground.

- this.groundYPos = 0;

- this.currentFrame = 0;

- this.currentAnimFrames = [];

- this.blinkDelay = 0;

- this.animStartTime = 0;

- this.timer = 0;

- this.msPerFrame = 1000 / FPS;

- this.config = Trex.config;

- // Current status.

- 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();

-};

-/**

- * T-rex player config.

- * @enum {number}

- */

-Trex.config = {

- DROP_VELOCITY: -5,

- GRAVITY: 0.6,

- HEIGHT: 47,

- HEIGHT_DUCK: 25,

- INIITAL_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

-};

-/**

- * Used in collision detection.

- * @type {Array<CollisionBox>}

- */

-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)

- ]

-};

-/**

- * Animation states.

- * @enum {string}

- */

-Trex.status = {

- CRASHED: 'CRASHED',

- DUCKING: 'DUCKING',

- JUMPING: 'JUMPING',

- RUNNING: 'RUNNING',

- WAITING: 'WAITING'

-};

-/**

- * Blinking coefficient.

- * @const

- */

-Trex.BLINK_TIMING = 7000;

-/**

- * Animation config for different states.

- * @enum {Object}

- */

-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: [262, 321],

- msPerFrame: 1000 / 8

- }

-};

-Trex.prototype = {

- /**

- * T-rex player initaliser.

- * Sets the t-rex to blink at random intervals.

- */

- init: function() {

- this.blinkDelay = this.setBlinkDelay();

- 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);

- },

- /**

- * Setter for the jump velocity.

- * The approriate drop velocity is also set.

- */

- setJumpVelocity: function(setting) {

- this.config.INIITAL_JUMP_VELOCITY = -setting;

- this.config.DROP_VELOCITY = -setting / 2;

- },

- /**

- * Set the animation status.

- * @param {!number} deltaTime

- * @param {Trex.status} status Optional status to switch to.

- */

- update: function(deltaTime, opt_status) {

- this.timer += deltaTime;

- // Update the status.

- 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();

- }

- // Game intro animation, T-rex moves in from the left.

- if (this.playingIntro && this.xPos < this.config.START_X_POS) {

- this.xPos += Math.round((this.config.START_X_POS /

- this.config.INTRO_DURATION) * deltaTime);

- }

- if (this.status == Trex.status.WAITING) {

- this.blink(getTimeStamp());

- } else {

- this.draw(this.currentAnimFrames[this.currentFrame], 0);

- }

- // Update the frame position.

- if (this.timer >= this.msPerFrame) {

- this.currentFrame = this.currentFrame ==

- this.currentAnimFrames.length - 1 ? 0 : this.currentFrame + 1;

- this.timer = 0;

- }

- // Speed drop becomes duck if the down key is still being pressed.

- if (this.speedDrop && this.yPos == this.groundYPos) {

- this.speedDrop = false;

- this.setDuck(true);

- }

- },

- /**

- * Draw the t-rex to a particular position.

- * @param {number} x

- * @param {number} y

- */

- 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;

- }

- // Adjustments for sprite sheet position.

- sourceX += this.spritePos.x;

- sourceY += this.spritePos.y;

- // Ducking.

- 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 {

- // Crashed whilst ducking. Trex is standing up so needs adjustment.

- if (this.ducking && this.status == Trex.status.CRASHED) {

- this.xPos++;

- }

- // Standing / running

- this.canvasCtx.drawImage(Runner.imageSprite, sourceX, sourceY,

- sourceWidth, sourceHeight,

- this.xPos, this.yPos,

- this.config.WIDTH, this.config.HEIGHT);

- }

- },

- /**

- * Sets a random time for the blink to happen.

- */

- setBlinkDelay: function() {

- this.blinkDelay = Math.ceil(Math.random() * Trex.BLINK_TIMING);

- },

- /**

- * Make t-rex blink at random intervals.

- * @param {number} time Current time in milliseconds.

- */

- blink: function(time) {

- var deltaTime = time - this.animStartTime;

- if (deltaTime >= this.blinkDelay) {

- this.draw(this.currentAnimFrames[this.currentFrame], 0);

- if (this.currentFrame == 1) {

- // Set new random delay to blink.

- this.setBlinkDelay();

- this.animStartTime = time;

- }

- },

- /**

- * Initialise a jump.

- * @param {number} speed

- */

- startJump: function(speed) {

- if (!this.jumping) {

- this.update(0, Trex.status.JUMPING);

- // Tweak the jump velocity based on the speed.

- this.jumpVelocity = this.config.INIITAL_JUMP_VELOCITY - (speed / 10);

- this.jumping = true;

- this.reachedMinHeight = false;

- this.speedDrop = false;

- }

- },

- /**

- * Jump is complete, falling down.

- */

- endJump: function() {

- if (this.reachedMinHeight &&

- this.jumpVelocity < this.config.DROP_VELOCITY) {

- this.jumpVelocity = this.config.DROP_VELOCITY;

- }

- },

- /**

- * Update frame for a jump.

- * @param {number} deltaTime

- * @param {number} speed

- */

- updateJump: function(deltaTime, speed) {

- var msPerFrame = Trex.animFrames[this.status].msPerFrame;

- var framesElapsed = deltaTime / msPerFrame;

- // Speed drop makes Trex fall faster.

- 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;

- // Minimum height has been reached.

- if (this.yPos < this.minJumpHeight || this.speedDrop) {

- this.reachedMinHeight = true;

- }

- // Reached max height

- if (this.yPos < this.config.MAX_JUMP_HEIGHT || this.speedDrop) {

- this.endJump();

- }

- // Back down at ground level. Jump completed.

- if (this.yPos > this.groundYPos) {

- this.reset();

- this.jumpCount++;

- }

- this.update(deltaTime);

- },

- /**

- * Set the speed drop. Immediately cancels the current jump.

- */

- setSpeedDrop: function() {

- this.speedDrop = true;

- this.jumpVelocity = 1;

- },

- /**

- * @param {boolean} isDucking.

- */

- 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 the t-rex to running at start of game.

- */

- reset: function() {

- 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;

- }

-};

-//******************************************************************************

-/**

- * Handles displaying the distance meter.

- * @param {!HTMLCanvasElement} canvas

- * @param {Object} spritePos Image position in sprite.

- * @param {number} canvasWidth

- * @constructor

- */

-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.acheivement = 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);

-};

-/**

- * @enum {number}

- */

-DistanceMeter.dimensions = {

- WIDTH: 10,

- HEIGHT: 13,

- DEST_WIDTH: 11

-};

-/**

- * Y positioning of the digits in the sprite sheet.

- * X position is always 0.

- * @type {Array<number>}

- */

-DistanceMeter.yPos = [0, 13, 27, 40, 53, 67, 80, 93, 107, 120];

-/**

- * Distance meter config.

- * @enum {number}

- */

-DistanceMeter.config = {

- // Number of digits.

- MAX_DISTANCE_UNITS: 5,

- // Distance that causes achievement animation.

- ACHIEVEMENT_DISTANCE: 100,

- // Used for conversion from pixel distance to a scaled unit.

- COEFFICIENT: 0.025,

- // Flash duration in milliseconds.

- FLASH_DURATION: 1000 / 4,

- // Flash iterations for achievement animation.

- FLASH_ITERATIONS: 3

-};

-DistanceMeter.prototype = {

- /**

- * Initialise the distance meter to '00000'.

- * @param {number} width Canvas width in px.

- */

- 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);

- },

- /**

- * Calculate the xPos in the canvas.

- * @param {number} canvasWidth

- */

- calcXPos: function(canvasWidth) {

- this.x = canvasWidth - (DistanceMeter.dimensions.DEST_WIDTH *

- (this.maxScoreUnits + 1));

- },

- /**

- * Draw a digit to canvas.

- * @param {number} digitPos Position of the digit.

- * @param {number} value Digit value 0-9.

- * @param {boolean} opt_highScore Whether drawing the high score.

- */

- 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;

- // For high DPI we 2x source values.

- if (IS_HIDPI) {

- sourceWidth *= 2;

- sourceHeight *= 2;

- sourceX *= 2;

- }

- sourceX += this.spritePos.x;

- sourceY += this.spritePos.y;

- this.canvasCtx.save();

- if (opt_highScore) {

- // Left of the current score.

- 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();

- },

- /**

- * Covert pixel distance to a 'real' distance.

- * @param {number} distance Pixel distance ran.

- * @return {number} The 'real' distance ran.

- */

- getActualDistance: function(distance) {

- return distance ? Math.round(distance * this.config.COEFFICIENT) : 0;

- },

- /**

- * Update the distance meter.

- * @param {number} distance

- * @param {number} deltaTime

- * @return {boolean} Whether the acheivement sound fx should be played.

- */

- update: function(deltaTime, distance) {

- var paint = true;

- var playSound = false;

- if (!this.acheivement) {

- distance = this.getActualDistance(distance);

- // Score has gone beyond the initial digit count.

- 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) {

- // Acheivement unlocked

- if (distance % this.config.ACHIEVEMENT_DISTANCE == 0) {

- // Flash score and play sound.

- this.acheivement = true;

- this.flashTimer = 0;

- playSound = true;

- }

- // Create a string representation of the distance with leading 0.

- var distanceStr = (this.defaultString +

- distance).substr(-this.maxScoreUnits);

- this.digits = distanceStr.split('');

- } else {

- this.digits = this.defaultString.split('');

- }

- } else {

- // Control flashing of the score on reaching acheivement.

- 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.acheivement = false;

- this.flashIterations = 0;

- this.flashTimer = 0;

- }

- // Draw the digits if not flashing.

- if (paint) {

- for (var i = this.digits.length - 1; i >= 0; i--) {

- this.draw(i, parseInt(this.digits[i]));

- }

- this.drawHighScore();

- return playSound;

- },

- /**

- * Draw the high score.

- */

- 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();

- },

- /**

- * Set the highscore as a array string.

- * Position of char in the sprite: H - 10, I - 11.

- * @param {number} distance Distance ran in pixels.

- */

- setHighScore: function(distance) {

- distance = this.getActualDistance(distance);

- var highScoreStr = (this.defaultString +

- distance).substr(-this.maxScoreUnits);

- this.highScore = ['10', '11', ''].concat(highScoreStr.split(''));

- },

- /**

- * Reset the distance meter back to '00000'.

- */

- reset: function() {

- this.update(0);

- this.acheivement = false;

- }

-};

-//******************************************************************************

-/**

- * Cloud background item.

- * Similar to an obstacle object but without collision boxes.

- * @param {HTMLCanvasElement} canvas Canvas element.

- * @param {Object} spritePos Position of image in sprite.

- * @param {number} containerWidth

- */

-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 object config.

- * @enum {number}

- */

-Cloud.config = {

- HEIGHT: 14,

- MAX_CLOUD_GAP: 400,

- MAX_SKY_LEVEL: 30,

- MIN_CLOUD_GAP: 100,

- MIN_SKY_LEVEL: 71,

- WIDTH: 46

-};

-Cloud.prototype = {

- /**

- * Initialise the cloud. Sets the Cloud height.

- */

- init: function() {

- this.yPos = getRandomNum(Cloud.config.MAX_SKY_LEVEL,

- Cloud.config.MIN_SKY_LEVEL);

- this.draw();

- },

- /**

- * Draw the cloud.

- */

- 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 the cloud position.

- * @param {number} speed

- */

- update: function(speed) {

- if (!this.remove) {

- this.xPos -= Math.ceil(speed);

- this.draw();

- // Mark as removeable if no longer in the canvas.

- if (!this.isVisible()) {

- this.remove = true;

- }

- },

- /**

- * Check if the cloud is visible on the stage.

- * @return {boolean}

- */

- isVisible: function() {

- return this.xPos + Cloud.config.WIDTH > 0;

- }

-};

-//******************************************************************************

-/**

- * Nightmode shows a moon and stars on the horizon.

- */

-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();

-};

-/**

- * @enum {number}

- */

-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 moving moon, changing phases.

- * @param {boolean} activated Whether night mode is activated.

- * @param {number} delta

- */

- update: function(activated, delta) {

- // Moon phase.

- if (activated && this.opacity == 0) {

- this.currentPhase++;

- if (this.currentPhase >= NightMode.phases.length) {

- this.currentPhase = 0;

- }

- // Fade in / out.

- 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;

- }

- // Set moon positioning.

- if (this.opacity > 0) {

- this.xPos = this.updateXPos(this.xPos, NightMode.config.MOON_SPEED);

- // Update stars.

- 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;

- // Stars.

- 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);

- }

- // Moon.

- 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();

- },

- // Do star placement.

- 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);

- }

-};

-//******************************************************************************

-/**

- * Horizon Line.

- * Consists of two connecting lines. Randomly assigns a flat / bumpy horizon.

- * @param {HTMLCanvasElement} canvas

- * @param {Object} spritePos Horizon position in sprite.

- * @constructor

- */

-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();

-};

-/**

- * Horizon line dimensions.

- * @enum {number}

- */

-HorizonLine.dimensions = {

- WIDTH: 600,

- HEIGHT: 12,

- YPOS: 127

-};

-HorizonLine.prototype = {

- /**

- * Set the source dimensions of the horizon line.

- */

- 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;

- },

- /**

- * Return the crop x position of a type.

- */

- getRandomType: function() {

- return Math.random() > this.bumpThreshold ? this.dimensions.WIDTH : 0;

- },

- /**

- * Draw the horizon line.

- */

- 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);

- },

- /**

- * Update the x position of an indivdual piece of the line.

- * @param {number} pos Line position.

- * @param {number} increment

- */

- 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 the horizon line.

- * @param {number} deltaTime

- * @param {number} speed

- */

- 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 horizon to the starting position.

- */

- reset: function() {

- this.xPos[0] = 0;

- this.xPos[1] = HorizonLine.dimensions.WIDTH;

- }

-};

-//******************************************************************************

-/**

- * Horizon background class.

- * @param {HTMLCanvasElement} canvas

- * @param {Object} spritePos Sprite positioning.

- * @param {Object} dimensions Canvas dimensions.

- * @param {number} gapCoefficient

- * @constructor

- */

-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;

- // Cloud

- this.clouds = [];

- this.cloudSpeed = this.config.BG_CLOUD_SPEED;

- // Horizon

- this.horizonLine = null;

- this.init();

-};

-/**

- * Horizon config.

- * @enum {number}

- */

-Horizon.config = {

- BG_CLOUD_SPEED: 0.2,

- BUMPY_THRESHOLD: .3,

- CLOUD_FREQUENCY: .5,

- HORIZON_HEIGHT: 16,

- MAX_CLOUDS: 6

-};

-Horizon.prototype = {

- /**

- * Initialise the horizon. Just add the line and a cloud. No obstacles.

- */

- 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);

- },

- /**

- * @param {number} deltaTime

- * @param {number} currentSpeed

- * @param {boolean} updateObstacles Used as an override to prevent

- * the obstacles from being updated / added. This happens in the

- * ease in section.

- * @param {boolean} showNightMode Night mode activated.

- */

- 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);

- }

- },

- /**

- * Update the cloud positions.

- * @param {number} deltaTime

- * @param {number} 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];

- // Check for adding a new cloud.

- if (numClouds < this.config.MAX_CLOUDS &&

- (this.dimensions.WIDTH - lastCloud.xPos) > lastCloud.cloudGap &&

- this.cloudFrequency > Math.random()) {

- this.addCloud();

- }

- // Remove expired clouds.

- this.clouds = this.clouds.filter(function(obj) {

- return !obj.remove;

- });

- } else {

- this.addCloud();

- }

- },

- /**

- * Update the obstacle positions.

- * @param {number} deltaTime

- * @param {number} currentSpeed

- */

- updateObstacles: function(deltaTime, currentSpeed) {

- // Obstacles, move to Horizon layer.

- var updatedObstacles = this.obstacles.slice(0);

- for (var i = 0; i < this.obstacles.length; i++) {

- var obstacle = this.obstacles[i];

- obstacle.update(deltaTime, currentSpeed);

- // Clean up existing obstacles.

- 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 {

- // Create new obstacles.

- this.addNewObstacle(currentSpeed);

- }

- },

- removeFirstObstacle: function() {

- this.obstacles.shift();

- },

- /**

- * Add a new obstacle.

- * @param {number} currentSpeed

- */

- addNewObstacle: function(currentSpeed) {

- var obstacleTypeIndex = getRandomNum(0, Obstacle.types.length - 1);

- var obstacleType = Obstacle.types[obstacleTypeIndex];

- // Check for multiples of the same type of obstacle.

- // Also check obstacle is available at current speed.

- 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);

- }

- },

- /**

- * Returns whether the previous two obstacles are the same as the next one.

- * Maximum duplication is set in config value MAX_OBSTACLE_DUPLICATION.

- * @return {boolean}

- */

- 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 the horizon layer.

- * Remove existing obstacles and reposition the horizon line.

- */

- reset: function() {

- this.obstacles = [];

- this.horizonLine.reset();

- this.nightMode.reset();

- },

- /**

- * Update the canvas width and scaling.

- * @param {number} width Canvas width.

- * @param {number} height Canvas height.

- */

- resize: function(width, height) {

- this.canvas.width = width;

- this.canvas.height = height;

- },

- /**

- * Add a new cloud to the horizon.

- */

- addCloud: function() {

- this.clouds.push(new Cloud(this.canvas, this.spritePos.CLOUD,

- this.dimensions.WIDTH));

- }

-};

-})();

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