extraction.html

<html>

  <head>
    <title>T-Rex Game (Extracted from source code)</title>
    <script type="text/javascript">
    // Copyright (c) 2014 The Chromium Authors. All rights reserved.
    // 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.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.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;
        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('UIWebViewForStaticFileContent') > -1;
      /** @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,
        MAX_CLOUDS: 6,
        MAX_OBSTACLE_LENGTH: 3,
        MAX_SPEED: 12,
        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',
        TOUCH_CONTROLLER: 'controller'
      };
      /**
       * Image source urls.
       * @enum {array.<object>}
       */
      Runner.imageSources = {
        LDPI: [
          { name: 'CACTUS_LARGE', id: '1x-obstacle-large' },
          { name: 'CACTUS_SMALL', id: '1x-obstacle-small' },
          { name: 'CLOUD', id: '1x-cloud' },
          { name: 'HORIZON', id: '1x-horizon' },
          { name: 'RESTART', id: '1x-restart' },
          { name: 'TEXT_SPRITE', id: '1x-text' },
          { name: 'TREX', id: '1x-trex' }
        ],
        HDPI: [
          { name: 'CACTUS_LARGE', id: '2x-obstacle-large' },
          { name: 'CACTUS_SMALL', id: '2x-obstacle-small' },
          { name: 'CLOUD', id: '2x-cloud' },
          { name: 'HORIZON', id: '2x-horizon' },
          { name: 'RESTART', id: '2x-restart' },
          { name: 'TEXT_SPRITE', id: '2x-text' },
          { name: 'TREX', id: '2x-trex' }
        ]
      };
      /**
       * 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 = {
        /**
         * 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;
            }
          }
        },
        /**
         * Load and cache the image assets from the page.
         */
        loadImages: function() {
          var imageSources = IS_HIDPI ? Runner.imageSources.HDPI :
            Runner.imageSources.LDPI;
          var numImages = imageSources.length;
          for (var i = numImages - 1; i >= 0; i--) {
            var imgSource = imageSources[i];
            this.images[imgSource.name] = document.getElementById(imgSource.id);
          }
          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.images, this.dimensions,
            this.config.GAP_COEFFICIENT);
          // Distance meter
          this.distanceMeter = new DistanceMeter(this.canvas,
            this.images.TEXT_SPRITE, this.dimensions.WIDTH);
          // Draw t-rex
          this.tRex = new Trex(this.canvas, this.images.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.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.
          window.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.config);
            }
            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);
            }
            // 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();
            }
            if (this.distanceMeter.getActualDistance(this.distanceRan) >
              this.distanceMeter.maxScore) {
              this.distanceRan = 0;
            }
            var playAcheivementSound = this.distanceMeter.update(deltaTime,
              Math.ceil(this.distanceRan));
            if (playAcheivementSound) {
              this.playSound(this.soundFx.SCORE);
            }
          }
          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) {
          if (e.target != this.detailsButton) {
            if (!this.crashed && (Runner.keycodes.JUMP[String(e.keyCode)] ||
                e.type == Runner.events.TOUCHSTART)) {
              if (!this.activated) {
                this.loadSounds();
                this.activated = true;
              }
              if (!this.tRex.jumping) {
                this.playSound(this.soundFx.BUTTON_PRESS);
                this.tRex.startJump();
              }
            }
            if (this.crashed && e.type == Runner.events.TOUCHSTART &&
              e.currentTarget == this.containerEl) {
              this.restart();
            }
          }
          // Speed drop, activated only when jump key is not pressed.
          if (Runner.keycodes.DUCK[e.keyCode] && this.tRex.jumping) {
            e.preventDefault();
            this.tRex.setSpeedDrop();
          }
        },
        /**
         * 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;
          } 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] ||
              (e.type == Runner.events.MOUSEUP && e.target == this.canvas) ||
              (deltaTime >= this.config.GAMEOVER_CLEAR_TIME &&
                Runner.keycodes.JUMP[keyCode])) {
              this.restart();
            }
          } else if (this.paused && isjumpKey) {
            this.play();
          }
        },
        /**
         * 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.images.TEXT_SPRITE, this.images.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.update();
          }
        },
        /**
         * Pause the game if the tab is not in focus.
         */
        onVisibilityChange: function(e) {
          if (document.hidden || document.webkitHidden || e.type == 'blur') {
            this.stop();
          } else {
            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);
          }
        }
      };
      /**
       * 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;
        }
        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 {!HTMLImage} textSprite
       * @param {!HTMLImage} restartImg
       * @param {!Object} dimensions Canvas dimensions.
       * @constructor
       */
      function GameOverPanel(canvas, textSprite, restartImg, dimensions) {
        this.canvas = canvas;
        this.canvasCtx = canvas.getContext('2d');
        this.canvasDimensions = dimensions;
        this.textSprite = textSprite;
        this.restartImg = restartImg;
        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;
          }
          // Game over text from sprite.
          this.canvasCtx.drawImage(this.textSprite,
            textSourceX, textSourceY, textSourceWidth, textSourceHeight,
            textTargetX, textTargetY, textTargetWidth, textTargetHeight);
          // Restart button.
          this.canvasCtx.drawImage(this.restartImg, 0, 0,
            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.collisionBoxes;
          // 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 {image} obstacleImg Image sprite.
       * @param {Object} dimensions
       * @param {number} gapCoefficient Mutipler in determining the gap.
       * @param {number} speed
       */
      function Obstacle(canvasCtx, type, obstacleImg, dimensions,
        gapCoefficient, speed) {
        this.canvasCtx = canvasCtx;
        this.image = obstacleImg;
        this.typeConfig = type;
        this.gapCoefficient = gapCoefficient;
        this.size = getRandomNum(1, Obstacle.MAX_OBSTACLE_LENGTH);
        this.dimensions = dimensions;
        this.remove = false;
        this.xPos = 0;
        this.yPos = this.typeConfig.yPos;
        this.width = 0;
        this.collisionBoxes = [];
        this.gap = 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;
            this.xPos = this.dimensions.WIDTH - this.width;
            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;
            }
            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;
            }
            // Sprite
            var sourceX = (sourceWidth * this.size) * (0.5 * (this.size - 1));
            this.canvasCtx.drawImage(this.image,
              sourceX, 0,
              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) {
              this.xPos -= Math.floor((speed * FPS / 1000) * deltaTime);
              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.
       */
      Obstacle.types = [{
          type: 'CACTUS_SMALL',
          className: ' cactus cactus-small ',
          width: 17,
          height: 35,
          yPos: 105,
          multipleSpeed: 3,
          minGap: 120,
          collisionBoxes: [
            new CollisionBox(0, 7, 5, 27),
            new CollisionBox(4, 0, 6, 34),
            new CollisionBox(10, 4, 7, 14)
          ]
        },
        {
          type: 'CACTUS_LARGE',
          className: ' cactus cactus-large ',
          width: 25,
          height: 50,
          yPos: 90,
          multipleSpeed: 6,
          minGap: 120,
          collisionBoxes: [
            new CollisionBox(0, 12, 7, 38),
            new CollisionBox(8, 0, 7, 49),
            new CollisionBox(13, 10, 10, 38)
          ]
        }
      ];
      //******************************************************************************
      /**
       * T-rex game character.
       * @param {HTMLCanvas} canvas
       * @param {HTMLImage} image Character image.
       * @constructor
       */
      function Trex(canvas, image) {
        this.canvas = canvas;
        this.canvasCtx = canvas.getContext('2d');
        this.image = image;
        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.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,
        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
      };
      /**
       * Used in collision detection.
       * @type {Array.<CollisionBox>}
       */
      Trex.collisionBoxes = [
        new CollisionBox(1, -1, 30, 26),
        new CollisionBox(32, 0, 8, 16),
        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',
        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
        }
      };
      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;
          }
        },
        /**
         * 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.config.WIDTH;
          var sourceHeight = this.config.HEIGHT;
          if (IS_HIDPI) {
            sourceX *= 2;
            sourceY *= 2;
            sourceWidth *= 2;
            sourceHeight *= 2;
          }
          this.canvasCtx.drawImage(this.image, 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.
         */
        startJump: function() {
          if (!this.jumping) {
            this.update(0, Trex.status.JUMPING);
            this.jumpVelocity = this.config.INIITAL_JUMP_VELOCITY;
            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
         */
        updateJump: function(deltaTime) {
          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;
        },
        /**
         * Reset the t-rex to running at start of game.
         */
        reset: function() {
          this.yPos = this.groundYPos;
          this.jumpVelocity = 0;
          this.jumping = 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 {!HTMLImage} spriteSheet Image sprite.
       * @param {number} canvasWidth
       * @constructor
       */
      function DistanceMeter(canvas, spriteSheet, canvasWidth) {
        this.canvas = canvas;
        this.canvasCtx = canvas.getContext('2d');
        this.image = spriteSheet;
        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.config = DistanceMeter.config;
        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.config.MAX_DISTANCE_UNITS;
          for (var i = 0; i < this.config.MAX_DISTANCE_UNITS; 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.config.MAX_DISTANCE_UNITS + 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 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;
          }
          this.canvasCtx.save();
          if (opt_highScore) {
            // Left of the current score.
            var highScoreX = this.x - (this.config.MAX_DISTANCE_UNITS * 2) *
              DistanceMeter.dimensions.WIDTH;
            this.canvasCtx.translate(highScoreX, this.y);
          } else {
            this.canvasCtx.translate(this.x, this.y);
          }
          this.canvasCtx.drawImage(this.image, sourceX, 0,
            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} deltaTime
         * @param {number} distance
         * @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);
            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.config.MAX_DISTANCE_UNITS);
              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.config.MAX_DISTANCE_UNITS);
          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 {Image} cloudImg
       * @param {number} containerWidth
       */
      function Cloud(canvas, cloudImg, containerWidth) {
        this.canvas = canvas;
        this.canvasCtx = this.canvas.getContext('2d');
        this.image = cloudImg;
        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(this.image, 0, 0,
            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;
        }
      };
      //******************************************************************************
      /**
       * Horizon Line.
       * Consists of two connecting lines. Randomly assigns a flat / bumpy horizon.
       * @param {HTMLCanvasElement} canvas
       * @param {HTMLImage} bgImg Horizon line sprite.
       * @constructor
       */
      function HorizonLine(canvas, bgImg) {
        this.image = bgImg;
        this.canvas = canvas;
        this.canvasCtx = canvas.getContext('2d');
        this.sourceDimensions = {};
        this.dimensions = HorizonLine.dimensions;
        this.sourceXPos = [0, 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(this.image, this.sourceXPos[0], 0,
            this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
            this.xPos[0], this.yPos,
            this.dimensions.WIDTH, this.dimensions.HEIGHT);
          this.canvasCtx.drawImage(this.image, this.sourceXPos[1], 0,
            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();
          }
        },
        /**
         * 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 {Array.<HTMLImageElement>} images
       * @param {object} dimensions Canvas dimensions.
       * @param {number} gapCoefficient
       * @constructor
       */
      function Horizon(canvas, images, dimensions, gapCoefficient) {
        this.canvas = canvas;
        this.canvasCtx = this.canvas.getContext('2d');
        this.config = Horizon.config;
        this.dimensions = dimensions;
        this.gapCoefficient = gapCoefficient;
        this.obstacles = [];
        this.horizonOffsets = [0, 0];
        this.cloudFrequency = this.config.CLOUD_FREQUENCY;
        // Cloud
        this.clouds = [];
        this.cloudImg = images.CLOUD;
        this.cloudSpeed = this.config.BG_CLOUD_SPEED;
        // Horizon
        this.horizonImg = images.HORIZON;
        this.horizonLine = null;
        // Obstacles
        this.obstacleImgs = {
          CACTUS_SMALL: images.CACTUS_SMALL,
          CACTUS_LARGE: images.CACTUS_LARGE
        };
        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.horizonImg);
        },
        /**
         * @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.
         */
        update: function(deltaTime, currentSpeed, updateObstacles) {
          this.runningTime += deltaTime;
          this.horizonLine.update(deltaTime, currentSpeed);
          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;
            });
          }
        },
        /**
         * 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);
          }
        },
        /**
         * Add a new obstacle.
         * @param {number} currentSpeed
         */
        addNewObstacle: function(currentSpeed) {
          var obstacleTypeIndex =
            getRandomNum(0, Obstacle.types.length - 1);
          var obstacleType = Obstacle.types[obstacleTypeIndex];
          var obstacleImg = this.obstacleImgs[obstacleType.type];
          this.obstacles.push(new Obstacle(this.canvasCtx, obstacleType,
            obstacleImg, this.dimensions, this.gapCoefficient, currentSpeed));
        },
        /**
         * Reset the horizon layer.
         * Remove existing obstacles and reposition the horizon line.
         */
        reset: function() {
          this.obstacles = [];
          this.horizonLine.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.cloudImg,
            this.dimensions.WIDTH));
        }
      };
    })();
    </script>
    <style>
    /* Copyright 2014 The Chromium Authors. All rights reserved.
   Use of this source code is governed by a BSD-style license that can be
   found in the LICENSE file. */
    body {
      background-color: #f7f7f7;
    }
    
    .interstitial-wrapper {
      box-sizing: border-box;
      font-size: 1em;
      line-height: 1.6em;
      margin: 50px auto 0;
      max-width: 600px;
      width: 100%;
    }

    @media (max-width: 700px) {
      .interstitial-wrapper {
        padding: 0 10%;
      }
    }

    @media (max-height: 600px) {
      .interstitial-wrapper {
        margin-top: 5px;
      }
    }
    </style>
    <style>
    /* Copyright 2013 The Chromium Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file. */
    /* Offline page */

    .interstitial-wrapper {
      color: #2b2b2b;
      font-size: 1em;
      line-height: 1.55;
      margin: 100px auto 0;
      max-width: 600px;
      width: 100%;
    }

    .runner-container {
      height: 150px;
      max-width: 600px;
      overflow: hidden;
      position: absolute;
      top: 10px;
      width: 44px;
      z-index: 2;
    }

    .runner-container {
      width: 44px;
    }

    .runner-canvas {
      height: 150px;
      max-width: 600px;
      opacity: 1;
      overflow: hidden;
      position: absolute;
      top: 0;
    }

    #offline-resources {
      display: none;
    }

    @media (max-height: 350px) {
      .interstitial-wrapper {
        margin-top: 5%;
      }
    }
    </style>
  </head>

  <body id="t"
        class="vsc-initialized">
    <div id="main-frame-error"
         class="interstitial-wrapper"
         jstcache="0">
      <div id="offline-resources"
           jstcache="0">
        <div id="offline-resources-1x"
             jstcache="0">
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               src="data:image/png;base64,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"
               jstcache="0">
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          <img id="1x-cloud"
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               jstcache="0">
          <img id="1x-trex"
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          <img id="1x-restart"
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        </div>
        <div id="offline-resources-2x"
             jstcache="0">
          <img id="2x-obstacle-large"
               src="data:image/png;base64,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"
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