// Function Fix for "requestAnimationFrame" 12.06.17
(function() {
var lastTime = 0;
var vendors = ['ms', 'moz', 'webkit', 'o'];
for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] 
|| window[vendors[x]+'CancelRequestAnimationFrame'];
}
if (!window.requestAnimationFrame)
window.requestAnimationFrame = function(callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function() { callback(currTime + timeToCall); }, 
timeToCall);
lastTime = currTime + timeToCall;
return id;
};
if (!window.cancelAnimationFrame)
window.cancelAnimationFrame = function(id) {
clearTimeout(id);
};
}());

(function() {
    'use strict';
    var currentScore = 0;

    // Fix for AudioContext 12.06.17
	var AudioContext = window.AudioContext // Default
	    || window.webkitAudioContext // Safari and old versions of Chrome
	    || false;

    function Runner(outerContainerId, opt_config) {
        if (Runner.instance_) {
            return Runner.instance_
        }
        Runner.instance_ = this;
        this.outerContainerEl = document.querySelector(outerContainerId);
        this.containerEl = null;
        this.snackbarEl = null;
        this.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;
        this.audioBuffer = null;
        this.soundFx = {};
        this.audioContext = null;
        this.images = {};
        this.imagesLoaded = 0;
        this.loadImages();
        this.gamepadPreviousKeyDown = false
    }
    window['Runner'] = Runner;
    var DEFAULT_WIDTH = 600;
    var FPS = 60;
    var IS_HIDPI = window.devicePixelRatio > 1;
    var IS_IOS = window.navigator.userAgent.indexOf('CriOS') > -1 || window.navigator.userAgent == 'UIWebViewForStaticFileContent';
    var IS_MOBILE = window.navigator.userAgent.indexOf('Mobi') > -1 || IS_IOS;
    var IS_TOUCH_ENABLED = 'ontouchstart' in window;
    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_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
    };
    Runner.defaultDimensions = {
        WIDTH: DEFAULT_WIDTH,
        HEIGHT: 150
    };
    Runner.classes = {
        CANVAS: 'runner-canvas',
        CONTAINER: 'runner-container',
        CRASHED: 'crashed',
        ICON: 'icon-offline',
        SNACKBAR: 'snackbar',
        SNACKBAR_SHOW: 'snackbar-show',
        TOUCH_CONTROLLER: 'controller'
    };
    Runner.spriteDefinition = {
        LDPI: {
            CACTUS_LARGE: {
                x: 332,
                y: 2
            },
            CACTUS_SMALL: {
                x: 228,
                y: 2
            },
            CLOUD: {
                x: 86,
                y: 2
            },
            HORIZON: {
                x: 2,
                y: 54
            },
            PTERODACTYL: {
                x: 134,
                y: 2
            },
            RESTART: {
                x: 2,
                y: 2
            },
            TEXT_SPRITE: {
                x: 484,
                y: 2
            },
            TREX: {
                x: 677,
                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
            },
            PTERODACTYL: {
                x: 260,
                y: 2
            },
            RESTART: {
                x: 2,
                y: 2
            },
            TEXT_SPRITE: {
                x: 954,
                y: 2
            },
            TREX: {
                x: 1338,
                y: 2
            }
        }
    };
    Runner.sounds = {
        BUTTON_PRESS: 'offline-sound-press',
        HIT: 'offline-sound-hit',
        SCORE: 'offline-sound-reached'
    };
    Runner.keycodes = {
        JUMP: {
            '38': 1,
            '32': 1
        },
        DUCK: {
            '40': 1
        },
        RESTART: {
            '13': 1
        }
    };
    Runner.events = {
        ANIM_END: 'webkitAnimationEnd',
        CLICK: 'click',
        KEYDOWN: 'keydown',
        KEYUP: 'keyup',
        MOUSEDOWN: 'mousedown',
        MOUSEUP: 'mouseup',
        RESIZE: 'resize',
        TOUCHEND: 'touchend',
        TOUCHSTART: 'touchstart',
        VISIBILITY: 'visibilitychange',
        BLUR: 'blur',
        FOCUS: 'focus',
        LOAD: 'load',
        GAMEPADCONNECTED: 'gamepadconnected'
    };
    Runner.prototype = {
        isDisabled: function() {
            return loadTimeData && loadTimeData.valueExists('disabledEasterEgg')
        },
        setupDisabledRunner: function() {
            this.containerEl = document.createElement('div');
            this.containerEl.className = Runner.classes.SNACKBAR;
            this.containerEl.textContent = loadTimeData.getValue('disabledEasterEgg');
            this.outerContainerEl.appendChild(this.containerEl);
            document.addEventListener(Runner.events.KEYDOWN, function(e) {
                if (Runner.keycodes.JUMP[e.keyCode]) {
                    this.containerEl.classList.add(Runner.classes.SNACKBAR_SHOW);
                    document.querySelector('.icon').classList.add('icon-disabled')
                }
            }.bind(this))
        },
        updateConfigSetting: function(setting, value) {
            if (setting in this.config && value != undefined) {
                this.config[setting] = value;
                switch (setting) {
                    case 'GRAVITY':
                    case 'MIN_JUMP_HEIGHT':
                    case 'SPEED_DROP_COEFFICIENT':
                        this.tRex.config[setting] = value;
                        break;
                    case 'INITIAL_JUMP_VELOCITY':
                        this.tRex.setJumpVelocity(value);
                        break;
                    case 'SPEED':
                        this.setSpeed(value);
                        break
                }
            }
        },
        loadImages: function() {
            if (IS_HIDPI) {
                Runner.imageSprite = document.getElementById('offline-resources-2x');
                this.spriteDef = Runner.spriteDefinition.HDPI
            } else {
                Runner.imageSprite = document.getElementById('offline-resources-1x');
                this.spriteDef = Runner.spriteDefinition.LDPI
            }
            this.init()
        },
        loadSounds: function() {
            if (!IS_IOS && AudioContext) { // Fix 12.06.17
                this.audioContext = new AudioContext();
                var resourceTemplate = document.getElementById(this.config.RESOURCE_TEMPLATE_ID).content;
                for (var sound in Runner.sounds) {
                    var soundSrc = resourceTemplate.getElementById(Runner.sounds[sound]).src;
                    soundSrc = soundSrc.substr(soundSrc.indexOf(',') + 1);
                    var buffer = decodeBase64ToArrayBuffer(soundSrc);
                    this.audioContext.decodeAudioData(buffer, function(index, audioData) {
                        this.soundFx[index] = audioData
                    }.bind(this, sound))
                }
            }
        },
        setSpeed: function(opt_speed) {
            var speed = opt_speed || this.currentSpeed;
            if (this.dimensions.WIDTH < DEFAULT_WIDTH) {
                var mobileSpeed = speed * this.dimensions.WIDTH / DEFAULT_WIDTH * this.config.MOBILE_SPEED_COEFFICIENT;
                this.currentSpeed = mobileSpeed > speed ? speed : mobileSpeed
            } else if (opt_speed) {
                this.currentSpeed = opt_speed
            }
        },
        init: function() {
            this.adjustDimensions();
            this.setSpeed();
            this.containerEl = document.createElement('div');
            this.containerEl.className = Runner.classes.CONTAINER;
            this.canvas = createCanvas(this.containerEl, this.dimensions.WIDTH, this.dimensions.HEIGHT, Runner.classes.PLAYER);
            this.canvasCtx = this.canvas.getContext('2d');
            this.canvasCtx.fillStyle = '#f7f7f7';
            this.canvasCtx.fill();
            Runner.updateCanvasScaling(this.canvas);
            this.horizon = new Horizon(this.canvas, this.spriteDef, this.dimensions, this.config.GAP_COEFFICIENT);
            this.distanceMeter = new DistanceMeter(this.canvas, this.spriteDef.TEXT_SPRITE, this.dimensions.WIDTH);
            this.tRex = new Trex(this.canvas, this.spriteDef.TREX);
            this.outerContainerEl.appendChild(this.containerEl);
            if (IS_MOBILE) {
                this.createTouchController()
            }
            this.startListening();
            this.update();
            window.addEventListener(Runner.events.RESIZE, this.debounceResize.bind(this))
        },
        createTouchController: function() {
            this.touchController = document.createElement('div');
            this.touchController.className = Runner.classes.TOUCH_CONTROLLER
        },
        debounceResize: function() {
            if (!this.resizeTimerId_) {
                this.resizeTimerId_ = setInterval(this.adjustDimensions.bind(this), 250)
            }
        },
        adjustDimensions: function() {
            clearInterval(this.resizeTimerId_);
            this.resizeTimerId_ = null;
            var boxStyles = window.getComputedStyle(this.outerContainerEl);
            var padding = Number(boxStyles.paddingLeft.substr(0, boxStyles.paddingLeft.length - 2));
            this.dimensions.WIDTH = this.outerContainerEl.offsetWidth - padding * 2;
            if (this.canvas) {
                this.canvas.width = this.dimensions.WIDTH;
                this.canvas.height = this.dimensions.HEIGHT;
                Runner.updateCanvasScaling(this.canvas);
                this.distanceMeter.calcXPos(this.dimensions.WIDTH);
                this.clearCanvas();
                this.horizon.update(0, 0, true);
                this.tRex.update(0);
                if (this.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)
                }
                if (this.crashed && this.gameOverPanel) {
                    this.gameOverPanel.updateDimensions(this.dimensions.WIDTH);
                    this.gameOverPanel.draw()
                }
            }
        },
        playIntro: function() {
            if (!this.started && !this.crashed) {
                this.playingIntro = true;
                this.tRex.playingIntro = true;
                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()
            }
        },
        startGame: function() {
            this.runningTime = 0;
            this.playingIntro = false;
            this.tRex.playingIntro = false;
            this.containerEl.style.webkitAnimation = '';
            this.playCount++;
            document.addEventListener(Runner.events.VISIBILITY, this.onVisibilityChange.bind(this));
            window.addEventListener(Runner.events.BLUR, this.onVisibilityChange.bind(this));
            window.addEventListener(Runner.events.FOCUS, this.onVisibilityChange.bind(this))
        },
        clearCanvas: function() {
            this.canvasCtx.clearRect(0, 0, this.dimensions.WIDTH, this.dimensions.HEIGHT)
        },
        update: function() {
            this.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;
                if (this.tRex.jumpCount == 1 && !this.playingIntro) {
                    this.playIntro()
                }
                if (this.playingIntro) {
                    this.horizon.update(0, this.currentSpeed, hasObstacles)
                } else {
                    deltaTime = !this.started ? 0 : deltaTime;
                    this.horizon.update(deltaTime, this.currentSpeed, hasObstacles)
                }
                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 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()
            }
        },
        handleEvent: function(e) {
            return (function(evtType, events) {
                switch (evtType) {
                    case events.KEYDOWN:
                    case events.TOUCHSTART:
                    case events.MOUSEDOWN:
                    case events.GAMEPADCONNECTED:
                        this.onKeyDown(e);
                        break;
                    case events.KEYUP:
                    case events.TOUCHEND:
                    case events.MOUSEUP:
                        this.onKeyUp(e);
                        break
                }
            }.bind(this))(e.type, Runner.events)
        },
        startListening: function() {
            document.addEventListener(Runner.events.KEYDOWN, this);
            document.addEventListener(Runner.events.KEYUP, this);
            if (IS_MOBILE) {
                this.touchController.addEventListener(Runner.events.TOUCHSTART, this);
                this.touchController.addEventListener(Runner.events.TOUCHEND, this);
                this.containerEl.addEventListener(Runner.events.TOUCHSTART, this)
            } else {
                document.addEventListener(Runner.events.MOUSEDOWN, this);
                document.addEventListener(Runner.events.MOUSEUP, this)
            }
            window.addEventListener(Runner.events.GAMEPADCONNECTED, this);
            window.setInterval(this.pollGamepads.bind(this), 10)
        },
        pollGamepads: function() {
            var gamepads = navigator.getGamepads ? navigator.getGamepads() : (navigator.webkitGetGamepads ? navigator.webkitGetGamepads() : []); //  Fix for navigator.getGamepads() 12.06.17
            var keydown = false;
            for (var i = 0; i < gamepads.length; i++) {
                if (gamepads[i] != undefined) {
                    if (gamepads[i].buttons.filter(function(e) {
                            return e.pressed == true
                        }).length > 0) {
                        keydown = true
                    }
                }
            }
            if (keydown != this.gamepadPreviousKeyDown) {
                this.gamepadPreviousKeyDown = keydown;
                var event = new Event(keydown ? 'keydown' : 'keyup');
                event.keyCode = 32;
                event.which = event.keyCode;
                event.altKey = false;
                event.ctrlKey = true;
                event.shiftKey = false;
                event.metaKey = false;
                document.dispatchEvent(event)
            }
        },
        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)
            }
        },
        onKeyDown: function(e) {
            if (IS_MOBILE) {
                e.preventDefault()
            }
            if (!this.crashed && (Runner.keycodes.JUMP[e.keyCode] || e.type == Runner.events.TOUCHSTART || e.type == Runner.events.GAMEPADCONNECTED)) {
                if (!this.activated) {
                    this.loadSounds();
                    this.activated = true
                }
                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) {
                    this.tRex.setSpeedDrop()
                } else if (!this.tRex.jumping && !this.tRex.ducking) {
                    this.tRex.setDuck(true)
                }
            }
        },
        onKeyUp: function(e) {
            var keyCode = String(e.keyCode);
            var isjumpKey = Runner.keycodes.JUMP[keyCode] || e.type == Runner.events.TOUCHEND || e.type == Runner.events.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) {
                var deltaTime = getTimeStamp() - this.time;
                if (Runner.keycodes.RESTART[keyCode] || this.isLeftClickOnCanvas(e) || (deltaTime >= this.config.GAMEOVER_CLEAR_TIME && Runner.keycodes.JUMP[keyCode])) {
                    this.restart()
                }
            } else if (this.paused && isjumpKey) {
                this.tRex.reset();
                this.play()
            }
        },
        isLeftClickOnCanvas: function(e) {
            return e.button != null && e.button < 2 && e.type == Runner.events.MOUSEUP && e.target == this.canvas
        },
        raq: function() {
            if (!this.drawPending) {
                this.drawPending = true;
                this.raqId = requestAnimationFrame(this.update.bind(this))
            }
        },
        isRunning: function() {
            return !!this.raqId
        },
        gameOver: function() {
            this.playSound(this.soundFx.HIT);
            vibrate(200);
            this.stop();
            this.crashed = true;
            this.distanceMeter.acheivement = false;
            this.tRex.update(100, Trex.status.CRASHED);
            if (!this.gameOverPanel) {
                this.gameOverPanel = new GameOverPanel(this.canvas, this.spriteDef.TEXT_SPRITE, this.spriteDef.RESTART, this.dimensions)
            } else {
                this.gameOverPanel.draw()
            }
            if (this.distanceRan > this.highestScore) {
                this.highestScore = Math.ceil(this.distanceRan);
                this.distanceMeter.setHighScore(this.highestScore);
                currentScore = Math.round(this.highestScore * 0.025);
                var score_d = 0;
                if (document.getElementById("score-5") !== null) {
                    score_d = document.getElementById("score-5").innerHTML
                }
                if (currentScore > score_d) {
                    var xhr = new XMLHttpRequest();
                    xhr.open('GET', '/inc/check.php?score=' + currentScore, false);
                    xhr.send();
                    if (xhr.status != 200) {} else {
                        if (xhr.responseText != '') {
                            if (user_name == '') {
                                user_name = prompt(xhr.responseText, 'Anonym');
                                if (user_name == 'null' || user_name == '') {
                                    user_name = 'Anonym'
                                }
                            } else {
                                alert(xhr.responseText)
                            }
                            xhr.open('GET', '/inc/set.php?name=' + user_name + '&score=' + currentScore, false);
                            xhr.send();
                            location.reload()
                        }
                    }
                }
            }
            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()
            }
        },
        onVisibilityChange: function(e) {
            if (document.hidden || document.webkitHidden || e.type == 'blur') {
                this.stop()
            } else if (!this.crashed) {
                this.tRex.reset();
                this.play()
            }
        },
        playSound: function(soundBuffer) {
            if (soundBuffer) {
                var sourceNode = this.audioContext.createBufferSource();
                sourceNode.buffer = soundBuffer;
                sourceNode.connect(this.audioContext.destination);
                sourceNode.start(0)
            }
        }
    };
    Runner.updateCanvasScaling = function(canvas, opt_width, opt_height) {
        var context = canvas.getContext('2d');
        var devicePixelRatio = Math.floor(window.devicePixelRatio) || 1;
        var backingStoreRatio = Math.floor(context.webkitBackingStorePixelRatio) || 1;
        var ratio = devicePixelRatio / backingStoreRatio;
        if (devicePixelRatio !== backingStoreRatio) {
            var oldWidth = opt_width || canvas.width;
            var oldHeight = opt_height || canvas.height;
            canvas.width = oldWidth * ratio;
            canvas.height = oldHeight * ratio;
            canvas.style.width = oldWidth + 'px';
            canvas.style.height = oldHeight + 'px';
            context.scale(ratio, ratio);
            return true
        } else if (devicePixelRatio == 1) {
            canvas.style.width = canvas.width + 'px';
            canvas.style.height = canvas.height + 'px'
        }
        return false
    };

    function getRandomNum(min, max) {
        return Math.floor(Math.random() * (max - min + 1)) + min
    }

    function vibrate(duration) {
        if (IS_MOBILE && window.navigator.vibrate) {
            window.navigator.vibrate(duration)
        }
    }

    function createCanvas(container, width, height, opt_classname) {
        var canvas = document.createElement('canvas');
        canvas.className = opt_classname ? Runner.classes.CANVAS + ' ' + opt_classname : Runner.classes.CANVAS;
        canvas.width = width;
        canvas.height = height;
        container.appendChild(canvas);
        return canvas
    }

    function decodeBase64ToArrayBuffer(base64String) {
        var len = (base64String.length / 4) * 3;
        var str = atob(base64String);
        var arrayBuffer = new ArrayBuffer(len);
        var bytes = new Uint8Array(arrayBuffer);
        for (var i = 0; i < len; i++) {
            bytes[i] = str.charCodeAt(i)
        }
        return bytes.buffer
    }

    function getTimeStamp() {
        //return IS_IOS ? new Date().getTime() : performance.now()
        return new Date().getTime(); // Safari 5.17 Fix 12.06.17
    }

    function GameOverPanel(canvas, textImgPos, restartImgPos, dimensions) {
        this.canvas = canvas;
        this.canvasCtx = canvas.getContext('2d');
        this.canvasDimensions = dimensions;
        this.textImgPos = textImgPos;
        this.restartImgPos = restartImgPos;
        this.draw()
    };
    GameOverPanel.dimensions = {
        TEXT_X: 0,
        TEXT_Y: 13,
        TEXT_WIDTH: 191,
        TEXT_HEIGHT: 11,
        RESTART_WIDTH: 36,
        RESTART_HEIGHT: 32
    };
    GameOverPanel.prototype = {
        updateDimensions: function(width, opt_height) {
            this.canvasDimensions.WIDTH = width;
            if (opt_height) {
                this.canvasDimensions.HEIGHT = opt_height
            }
        },
        draw: function() {
            var dimensions = GameOverPanel.dimensions;
            var centerX = this.canvasDimensions.WIDTH / 2;
            var textSourceX = dimensions.TEXT_X;
            var textSourceY = dimensions.TEXT_Y;
            var textSourceWidth = dimensions.TEXT_WIDTH;
            var textSourceHeight = dimensions.TEXT_HEIGHT;
            var textTargetX = Math.round(centerX - (dimensions.TEXT_WIDTH / 2));
            var textTargetY = Math.round((this.canvasDimensions.HEIGHT - 25) / 3);
            var textTargetWidth = dimensions.TEXT_WIDTH;
            var textTargetHeight = dimensions.TEXT_HEIGHT;
            var restartSourceWidth = dimensions.RESTART_WIDTH;
            var restartSourceHeight = dimensions.RESTART_HEIGHT;
            var restartTargetX = centerX - (dimensions.RESTART_WIDTH / 2);
            var restartTargetY = this.canvasDimensions.HEIGHT / 2;
            if (IS_HIDPI) {
                textSourceY *= 2;
                textSourceX *= 2;
                textSourceWidth *= 2;
                textSourceHeight *= 2;
                restartSourceWidth *= 2;
                restartSourceHeight *= 2
            }
            textSourceX += this.textImgPos.x;
            textSourceY += this.textImgPos.y;
            this.canvasCtx.drawImage(Runner.imageSprite, textSourceX, textSourceY, textSourceWidth, textSourceHeight, textTargetX, textTargetY, textTargetWidth, textTargetHeight);
            this.canvasCtx.drawImage(Runner.imageSprite, this.restartImgPos.x, this.restartImgPos.y, restartSourceWidth, restartSourceHeight, restartTargetX, restartTargetY, dimensions.RESTART_WIDTH, dimensions.RESTART_HEIGHT)
        }
    };

    function checkForCollision(obstacle, tRex, opt_canvasCtx) {
        var obstacleBoxXPos = Runner.defaultDimensions.WIDTH + obstacle.xPos;
        var tRexBox = new CollisionBox(tRex.xPos + 1, tRex.yPos + 1, tRex.config.WIDTH - 2, tRex.config.HEIGHT - 2);
        var obstacleBox = new CollisionBox(obstacle.xPos + 1, obstacle.yPos + 1, obstacle.typeConfig.width * obstacle.size - 2, obstacle.typeConfig.height - 2);
        if (opt_canvasCtx) {
            drawCollisionBoxes(opt_canvasCtx, tRexBox, obstacleBox)
        }
        if (boxCompare(tRexBox, obstacleBox)) {
            var collisionBoxes = obstacle.collisionBoxes;
            var tRexCollisionBoxes = tRex.ducking ? Trex.collisionBoxes.DUCKING : Trex.collisionBoxes.RUNNING;
            for (var t = 0; t < tRexCollisionBoxes.length; t++) {
                for (var i = 0; i < collisionBoxes.length; i++) {
                    var adjTrexBox = createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);
                    var adjObstacleBox = createAdjustedCollisionBox(collisionBoxes[i], obstacleBox);
                    var crashed = boxCompare(adjTrexBox, adjObstacleBox);
                    if (opt_canvasCtx) {
                        drawCollisionBoxes(opt_canvasCtx, adjTrexBox, adjObstacleBox)
                    }
                    if (crashed) {
                        return [adjTrexBox, adjObstacleBox]
                    }
                }
            }
        }
        return false
    };

    function createAdjustedCollisionBox(box, adjustment) {
        return new CollisionBox(box.x + adjustment.x, box.y + adjustment.y, box.width, box.height)
    };

    function drawCollisionBoxes(canvasCtx, tRexBox, obstacleBox) {
        canvasCtx.save();
        canvasCtx.strokeStyle = '#f00';
        canvasCtx.strokeRect(tRexBox.x, tRexBox.y, tRexBox.width, tRexBox.height);
        canvasCtx.strokeStyle = '#0f0';
        canvasCtx.strokeRect(obstacleBox.x, obstacleBox.y, obstacleBox.width, obstacleBox.height);
        canvasCtx.restore()
    };

    function boxCompare(tRexBox, obstacleBox) {
        var crashed = false;
        var tRexBoxX = tRexBox.x;
        var tRexBoxY = tRexBox.y;
        var obstacleBoxX = obstacleBox.x;
        var obstacleBoxY = obstacleBox.y;
        if (tRexBox.x < obstacleBoxX + obstacleBox.width && tRexBox.x + tRexBox.width > obstacleBoxX && tRexBox.y < obstacleBox.y + obstacleBox.height && tRexBox.height + tRexBox.y > obstacleBox.y) {
            crashed = true
        }
        return crashed
    };

    function CollisionBox(x, y, w, h) {
        this.x = x;
        this.y = y;
        this.width = w;
        this.height = h
    };

    function Obstacle(canvasCtx, type, spriteImgPos, dimensions, gapCoefficient, speed) {
        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 = 0;
        this.yPos = 0;
        this.width = 0;
        this.collisionBoxes = [];
        this.gap = 0;
        this.speedOffset = 0;
        this.currentFrame = 0;
        this.timer = 0;
        this.init(speed)
    };
    Obstacle.MAX_GAP_COEFFICIENT = 1.5;
    Obstacle.MAX_OBSTACLE_LENGTH = 3, Obstacle.prototype = {
        init: function(speed) {
            this.cloneCollisionBoxes();
            if (this.size > 1 && this.typeConfig.multipleSpeed > speed) {
                this.size = 1
            }
            this.width = this.typeConfig.width * this.size;
            this.xPos = this.dimensions.WIDTH - this.width;
            if (Array.isArray(this.typeConfig.yPos)) {
                var yPosConfig = IS_MOBILE ? this.typeConfig.yPosMobile : this.typeConfig.yPos;
                this.yPos = yPosConfig[getRandomNum(0, yPosConfig.length - 1)]
            } else {
                this.yPos = this.typeConfig.yPos
            }
            this.draw();
            if (this.size > 1) {
                this.collisionBoxes[1].width = this.width - this.collisionBoxes[0].width - this.collisionBoxes[2].width;
                this.collisionBoxes[2].x = this.width - this.collisionBoxes[2].width
            }
            if (this.typeConfig.speedOffset) {
                this.speedOffset = Math.random() > 0.5 ? this.typeConfig.speedOffset : -this.typeConfig.speedOffset
            }
            this.gap = this.getGap(this.gapCoefficient, speed)
        },
        draw: function() {
            var sourceWidth = this.typeConfig.width;
            var sourceHeight = this.typeConfig.height;
            if (IS_HIDPI) {
                sourceWidth = sourceWidth * 2;
                sourceHeight = sourceHeight * 2
            }
            var sourceX = (sourceWidth * this.size) * (0.5 * (this.size - 1)) + this.spritePos.x;
            if (this.currentFrame > 0) {
                sourceX += sourceWidth * this.currentFrame
            }
            this.canvasCtx.drawImage(Runner.imageSprite, sourceX, this.spritePos.y, sourceWidth * this.size, sourceHeight, this.xPos, this.yPos, this.typeConfig.width * this.size, this.typeConfig.height)
        },
        update: function(deltaTime, speed) {
            if (!this.remove) {
                if (this.typeConfig.speedOffset) {
                    speed += this.speedOffset
                }
                this.xPos -= Math.floor((speed * FPS / 1000) * deltaTime);
                if (this.typeConfig.numFrames) {
                    this.timer += deltaTime;
                    if (this.timer >= this.typeConfig.frameRate) {
                        this.currentFrame = this.currentFrame == this.typeConfig.numFrames - 1 ? 0 : this.currentFrame + 1;
                        this.timer = 0
                    }
                }
                this.draw();
                if (!this.isVisible()) {
                    this.remove = true
                }
            }
        },
        getGap: function(gapCoefficient, speed) {
            var minGap = Math.round(this.width * speed + this.typeConfig.minGap * gapCoefficient);
            var maxGap = Math.round(minGap * Obstacle.MAX_GAP_COEFFICIENT);
            return getRandomNum(minGap, maxGap)
        },
        isVisible: function() {
            return this.xPos + this.width > 0
        },
        cloneCollisionBoxes: function() {
            var collisionBoxes = this.typeConfig.collisionBoxes;
            for (var i = collisionBoxes.length - 1; i >= 0; i--) {
                this.collisionBoxes[i] = new CollisionBox(collisionBoxes[i].x, collisionBoxes[i].y, collisionBoxes[i].width, collisionBoxes[i].height)
            }
        }
    };
    Obstacle.types = [{
        type: 'CACTUS_SMALL',
        width: 17,
        height: 35,
        yPos: 105,
        multipleSpeed: 4,
        minGap: 120,
        minSpeed: 0,
        collisionBoxes: [new CollisionBox(0, 7, 5, 27), new CollisionBox(4, 0, 6, 34), new CollisionBox(10, 4, 7, 14)]
    }, {
        type: 'CACTUS_LARGE',
        width: 25,
        height: 50,
        yPos: 90,
        multipleSpeed: 7,
        minGap: 120,
        minSpeed: 0,
        collisionBoxes: [new CollisionBox(0, 12, 7, 38), new CollisionBox(8, 0, 7, 49), new CollisionBox(13, 10, 10, 38)]
    }, {
        type: 'PTERODACTYL',
        width: 46,
        height: 40,
        yPos: [100, 75, 50],
        yPosMobile: [100, 50],
        multipleSpeed: 999,
        minSpeed: 8.5,
        minGap: 150,
        collisionBoxes: [new CollisionBox(15, 15, 16, 5), new CollisionBox(18, 21, 24, 6), new CollisionBox(2, 14, 4, 3), new CollisionBox(6, 10, 4, 7), new CollisionBox(10, 8, 6, 9)],
        numFrames: 2,
        frameRate: 1000 / 6,
        speedOffset: .8
    }];

    function Trex(canvas, spritePos) {
        this.canvas = canvas;
        this.canvasCtx = canvas.getContext('2d');
        this.spritePos = spritePos;
        this.xPos = 0;
        this.yPos = 0;
        this.groundYPos = 0;
        this.currentFrame = 0;
        this.currentAnimFrames = [];
        this.blinkDelay = 0;
        this.animStartTime = 0;
        this.timer = 0;
        this.msPerFrame = 1000 / FPS;
        this.config = Trex.config;
        this.status = Trex.status.WAITING;
        this.jumping = false;
        this.ducking = false;
        this.jumpVelocity = 0;
        this.reachedMinHeight = false;
        this.speedDrop = false;
        this.jumpCount = 0;
        this.jumpspotX = 0;
        this.init()
    };
    Trex.config = {
        DROP_VELOCITY: -5,
        GRAVITY: 0.6,
        HEIGHT: 47,
        HEIGHT_DUCK: 25,
        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
    };
    Trex.collisionBoxes = {
        DUCKING: [new CollisionBox(1, 18, 55, 25)],
        RUNNING: [new CollisionBox(22, 0, 17, 16), new CollisionBox(1, 18, 30, 9), new CollisionBox(10, 35, 14, 8), new CollisionBox(1, 24, 29, 5), new CollisionBox(5, 30, 21, 4), new CollisionBox(9, 34, 15, 4)]
    };
    Trex.status = {
        CRASHED: 'CRASHED',
        DUCKING: 'DUCKING',
        JUMPING: 'JUMPING',
        RUNNING: 'RUNNING',
        WAITING: 'WAITING'
    };
    Trex.BLINK_TIMING = 7000;
    Trex.animFrames = {
        WAITING: {
            frames: [44, 0],
            msPerFrame: 1000 / 3
        },
        RUNNING: {
            frames: [88, 132],
            msPerFrame: 1000 / 12
        },
        CRASHED: {
            frames: [220],
            msPerFrame: 1000 / 60
        },
        JUMPING: {
            frames: [0],
            msPerFrame: 1000 / 60
        },
        DUCKING: {
            frames: [262, 321],
            msPerFrame: 1000 / 8
        }
    };
    Trex.prototype = {
        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)
        },
        setJumpVelocity: function(setting) {
            this.config.INIITAL_JUMP_VELOCITY = -setting;
            this.config.DROP_VELOCITY = -setting / 2
        },
        update: function(deltaTime, opt_status) {
            this.timer += deltaTime;
            if (opt_status) {
                this.status = opt_status;
                this.currentFrame = 0;
                this.msPerFrame = Trex.animFrames[opt_status].msPerFrame;
                this.currentAnimFrames = Trex.animFrames[opt_status].frames;
                if (opt_status == Trex.status.WAITING) {
                    this.animStartTime = getTimeStamp();
                    this.setBlinkDelay()
                }
            }
            if (this.playingIntro && this.xPos < this.config.START_X_POS) {
                this.xPos += Math.round((this.config.START_X_POS / this.config.INTRO_DURATION) * deltaTime)
            }
            if (this.status == Trex.status.WAITING) {
                this.blink(getTimeStamp())
            } else {
                this.draw(this.currentAnimFrames[this.currentFrame], 0)
            }
            if (this.timer >= this.msPerFrame) {
                this.currentFrame = this.currentFrame == this.currentAnimFrames.length - 1 ? 0 : this.currentFrame + 1;
                this.timer = 0
            }
            if (this.speedDrop && this.yPos == this.groundYPos) {
                this.speedDrop = false;
                this.setDuck(true)
            }
        },
        draw: function(x, y) {
            var sourceX = x;
            var sourceY = y;
            var sourceWidth = this.ducking && this.status != Trex.status.CRASHED ? this.config.WIDTH_DUCK : this.config.WIDTH;
            var sourceHeight = this.config.HEIGHT;
            if (IS_HIDPI) {
                sourceX *= 2;
                sourceY *= 2;
                sourceWidth *= 2;
                sourceHeight *= 2
            }
            sourceX += this.spritePos.x;
            sourceY += this.spritePos.y;
            if (this.ducking && this.status != Trex.status.CRASHED) {
                this.canvasCtx.drawImage(Runner.imageSprite, sourceX, sourceY, sourceWidth, sourceHeight, this.xPos, this.yPos, this.config.WIDTH_DUCK, this.config.HEIGHT)
            } else {
                if (this.ducking && this.status == Trex.status.CRASHED) {
                    this.xPos++
                }
                this.canvasCtx.drawImage(Runner.imageSprite, sourceX, sourceY, sourceWidth, sourceHeight, this.xPos, this.yPos, this.config.WIDTH, this.config.HEIGHT)
            }
        },
        setBlinkDelay: function() {
            this.blinkDelay = Math.ceil(Math.random() * Trex.BLINK_TIMING)
        },
        blink: function(time) {
            var deltaTime = time - this.animStartTime;
            if (deltaTime >= this.blinkDelay) {
                this.draw(this.currentAnimFrames[this.currentFrame], 0);
                if (this.currentFrame == 1) {
                    this.setBlinkDelay();
                    this.animStartTime = time
                }
            }
        },
        startJump: function(speed) {
            if (!this.jumping) {
                this.update(0, Trex.status.JUMPING);
                this.jumpVelocity = this.config.INIITAL_JUMP_VELOCITY - (speed / 10);
                this.jumping = true;
                this.reachedMinHeight = false;
                this.speedDrop = false
            }
        },
        endJump: function() {
            if (this.reachedMinHeight && this.jumpVelocity < this.config.DROP_VELOCITY) {
                this.jumpVelocity = this.config.DROP_VELOCITY
            }
        },
        updateJump: function(deltaTime, speed) {
            var msPerFrame = Trex.animFrames[this.status].msPerFrame;
            var framesElapsed = deltaTime / msPerFrame;
            if (this.speedDrop) {
                this.yPos += Math.round(this.jumpVelocity * this.config.SPEED_DROP_COEFFICIENT * framesElapsed)
            } else {
                this.yPos += Math.round(this.jumpVelocity * framesElapsed)
            }
            this.jumpVelocity += this.config.GRAVITY * framesElapsed;
            if (this.yPos < this.minJumpHeight || this.speedDrop) {
                this.reachedMinHeight = true
            }
            if (this.yPos < this.config.MAX_JUMP_HEIGHT || this.speedDrop) {
                this.endJump()
            }
            if (this.yPos > this.groundYPos) {
                this.reset();
                this.jumpCount++
            }
            this.update(deltaTime)
        },
        setSpeedDrop: function() {
            this.speedDrop = true;
            this.jumpVelocity = 1
        },
        setDuck: function(isDucking) {
            if (isDucking && this.status != Trex.status.DUCKING) {
                this.update(0, Trex.status.DUCKING);
                this.ducking = true
            } else if (this.status == Trex.status.DUCKING) {
                this.update(0, Trex.status.RUNNING);
                this.ducking = false
            }
        },
        reset: function() {
            this.yPos = this.groundYPos;
            this.jumpVelocity = 0;
            this.jumping = false;
            this.ducking = false;
            this.update(0, Trex.status.RUNNING);
            this.midair = false;
            this.speedDrop = false;
            this.jumpCount = 0
        }
    };

    function DistanceMeter(canvas, spritePos, canvasWidth) {
        this.canvas = canvas;
        this.canvasCtx = canvas.getContext('2d');
        this.image = Runner.imageSprite;
        this.spritePos = spritePos;
        this.x = 0;
        this.y = 5;
        this.currentDistance = 0;
        this.maxScore = 0;
        this.highScore = 0;
        this.container = null;
        this.digits = [];
        this.acheivement = false;
        this.defaultString = '';
        this.flashTimer = 0;
        this.flashIterations = 0;
        this.config = DistanceMeter.config;
        this.maxScoreUnits = this.config.MAX_DISTANCE_UNITS;
        this.init(canvasWidth)
    };
    DistanceMeter.dimensions = {
        WIDTH: 10,
        HEIGHT: 13,
        DEST_WIDTH: 11
    };
    DistanceMeter.yPos = [0, 13, 27, 40, 53, 67, 80, 93, 107, 120];
    DistanceMeter.config = {
        MAX_DISTANCE_UNITS: 5,
        ACHIEVEMENT_DISTANCE: 100,
        COEFFICIENT: 0.025,
        FLASH_DURATION: 1000 / 4,
        FLASH_ITERATIONS: 3
    };
    DistanceMeter.prototype = {
        init: function(width) {
            var maxDistanceStr = '';
            this.calcXPos(width);
            this.maxScore = this.maxScoreUnits;
            for (var i = 0; i < this.maxScoreUnits; i++) {
                this.draw(i, 0);
                this.defaultString += '0';
                maxDistanceStr += '9'
            }
            this.maxScore = parseInt(maxDistanceStr)
        },
        calcXPos: function(canvasWidth) {
            this.x = canvasWidth - (DistanceMeter.dimensions.DEST_WIDTH * (this.maxScoreUnits + 1))
        },
        draw: function(digitPos, value, opt_highScore) {
            var sourceWidth = DistanceMeter.dimensions.WIDTH;
            var sourceHeight = DistanceMeter.dimensions.HEIGHT;
            var sourceX = DistanceMeter.dimensions.WIDTH * value;
            var sourceY = 0;
            var targetX = digitPos * DistanceMeter.dimensions.DEST_WIDTH;
            var targetY = this.y;
            var targetWidth = DistanceMeter.dimensions.WIDTH;
            var targetHeight = DistanceMeter.dimensions.HEIGHT;
            if (IS_HIDPI) {
                sourceWidth *= 2;
                sourceHeight *= 2;
                sourceX *= 2
            }
            sourceX += this.spritePos.x;
            sourceY += this.spritePos.y;
            this.canvasCtx.save();
            if (opt_highScore) {
                var highScoreX = this.x - (this.maxScoreUnits * 2) * DistanceMeter.dimensions.WIDTH;
                this.canvasCtx.translate(highScoreX, this.y)
            } else {
                this.canvasCtx.translate(this.x, this.y)
            }
            this.canvasCtx.drawImage(this.image, sourceX, sourceY, sourceWidth, sourceHeight, targetX, targetY, targetWidth, targetHeight);
            this.canvasCtx.restore()
        },
        getActualDistance: function(distance) {
            return distance ? Math.round(distance * this.config.COEFFICIENT) : 0
        },
        update: function(deltaTime, distance) {
            var paint = true;
            var playSound = false;
            if (!this.acheivement) {
                distance = this.getActualDistance(distance);
                if (distance > this.maxScore && this.maxScoreUnits == this.config.MAX_DISTANCE_UNITS) {
                    this.maxScoreUnits++;
                    this.maxScore = parseInt(this.maxScore + '9')
                } else {
                    this.distance = 0
                }
                if (distance > 0) {
                    if (distance % this.config.ACHIEVEMENT_DISTANCE == 0) {
                        this.acheivement = true;
                        this.flashTimer = 0;
                        playSound = true
                    }
                    var distanceStr = (this.defaultString + distance).substr(-this.maxScoreUnits);
                    this.digits = distanceStr.split('')
                } else {
                    this.digits = this.defaultString.split('')
                }
            } else {
                if (this.flashIterations <= this.config.FLASH_ITERATIONS) {
                    this.flashTimer += deltaTime;
                    if (this.flashTimer < this.config.FLASH_DURATION) {
                        paint = false
                    } else if (this.flashTimer > this.config.FLASH_DURATION * 2) {
                        this.flashTimer = 0;
                        this.flashIterations++
                    }
                } else {
                    this.acheivement = false;
                    this.flashIterations = 0;
                    this.flashTimer = 0
                }
            }
            if (paint) {
                for (var i = this.digits.length - 1; i >= 0; i--) {
                    this.draw(i, parseInt(this.digits[i]))
                }
            }
            this.drawHighScore();
            return playSound
        },
        drawHighScore: function() {
            this.canvasCtx.save();
            this.canvasCtx.globalAlpha = .8;
            for (var i = this.highScore.length - 1; i >= 0; i--) {
                this.draw(i, parseInt(this.highScore[i], 10), true)
            }
            this.canvasCtx.restore()
        },
        setHighScore: function(distance) {
            distance = this.getActualDistance(distance);
            var highScoreStr = (this.defaultString + distance).substr(-this.maxScoreUnits);
            this.highScore = ['10', '11', ''].concat(highScoreStr.split(''))
        },
        reset: function() {
            this.update(0);
            this.acheivement = false
        }
    };

    function Cloud(canvas, spritePos, containerWidth) {
        this.canvas = canvas;
        this.canvasCtx = this.canvas.getContext('2d');
        this.spritePos = spritePos;
        this.containerWidth = containerWidth;
        this.xPos = containerWidth;
        this.yPos = 0;
        this.remove = false;
        this.cloudGap = getRandomNum(Cloud.config.MIN_CLOUD_GAP, Cloud.config.MAX_CLOUD_GAP);
        this.init()
    };
    Cloud.config = {
        HEIGHT: 14,
        MAX_CLOUD_GAP: 400,
        MAX_SKY_LEVEL: 30,
        MIN_CLOUD_GAP: 100,
        MIN_SKY_LEVEL: 71,
        WIDTH: 46
    };
    Cloud.prototype = {
        init: function() {
            this.yPos = getRandomNum(Cloud.config.MAX_SKY_LEVEL, Cloud.config.MIN_SKY_LEVEL);
            this.draw()
        },
        draw: function() {
            this.canvasCtx.save();
            var sourceWidth = Cloud.config.WIDTH;
            var sourceHeight = Cloud.config.HEIGHT;
            if (IS_HIDPI) {
                sourceWidth = sourceWidth * 2;
                sourceHeight = sourceHeight * 2
            }
            this.canvasCtx.drawImage(Runner.imageSprite, this.spritePos.x, this.spritePos.y, sourceWidth, sourceHeight, this.xPos, this.yPos, Cloud.config.WIDTH, Cloud.config.HEIGHT);
            this.canvasCtx.restore()
        },
        update: function(speed) {
            if (!this.remove) {
                this.xPos -= Math.ceil(speed);
                this.draw();
                if (!this.isVisible()) {
                    this.remove = true
                }
            }
        },
        isVisible: function() {
            return this.xPos + Cloud.config.WIDTH > 0
        }
    };

    function HorizonLine(canvas, spritePos) {
        this.spritePos = spritePos;
        this.canvas = canvas;
        this.canvasCtx = canvas.getContext('2d');
        this.sourceDimensions = {};
        this.dimensions = HorizonLine.dimensions;
        this.sourceXPos = [this.spritePos.x, this.spritePos.x + this.dimensions.WIDTH];
        this.xPos = [];
        this.yPos = 0;
        this.bumpThreshold = 0.5;
        this.setSourceDimensions();
        this.draw()
    };
    HorizonLine.dimensions = {
        WIDTH: 600,
        HEIGHT: 12,
        YPOS: 127
    };
    HorizonLine.prototype = {
        setSourceDimensions: function() {
            for (var dimension in HorizonLine.dimensions) {
                if (IS_HIDPI) {
                    if (dimension != 'YPOS') {
                        this.sourceDimensions[dimension] = HorizonLine.dimensions[dimension] * 2
                    }
                } else {
                    this.sourceDimensions[dimension] = HorizonLine.dimensions[dimension]
                }
                this.dimensions[dimension] = HorizonLine.dimensions[dimension]
            }
            this.xPos = [0, HorizonLine.dimensions.WIDTH];
            this.yPos = HorizonLine.dimensions.YPOS
        },
        getRandomType: function() {
            return Math.random() > this.bumpThreshold ? this.dimensions.WIDTH : 0
        },
        draw: function() {
            this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[0], this.spritePos.y, this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT, this.xPos[0], this.yPos, this.dimensions.WIDTH, this.dimensions.HEIGHT);
            this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[1], this.spritePos.y, this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT, this.xPos[1], this.yPos, this.dimensions.WIDTH, this.dimensions.HEIGHT)
        },
        updateXPos: function(pos, increment) {
            var line1 = pos;
            var line2 = pos == 0 ? 1 : 0;
            this.xPos[line1] -= increment;
            this.xPos[line2] = this.xPos[line1] + this.dimensions.WIDTH;
            if (this.xPos[line1] <= -this.dimensions.WIDTH) {
                this.xPos[line1] += this.dimensions.WIDTH * 2;
                this.xPos[line2] = this.xPos[line1] - this.dimensions.WIDTH;
                this.sourceXPos[line1] = this.getRandomType() + this.spritePos.x
            }
        },
        update: function(deltaTime, speed) {
            var increment = Math.floor(speed * (FPS / 1000) * deltaTime);
            if (this.xPos[0] <= 0) {
                this.updateXPos(0, increment)
            } else {
                this.updateXPos(1, increment)
            }
            this.draw()
        },
        reset: function() {
            this.xPos[0] = 0;
            this.xPos[1] = HorizonLine.dimensions.WIDTH
        }
    };

    function Horizon(canvas, spritePos, dimensions, gapCoefficient) {
        this.canvas = canvas;
        this.canvasCtx = this.canvas.getContext('2d');
        this.config = Horizon.config;
        this.dimensions = dimensions;
        this.gapCoefficient = gapCoefficient;
        this.obstacles = [];
        this.obstacleHistory = [];
        this.horizonOffsets = [0, 0];
        this.cloudFrequency = this.config.CLOUD_FREQUENCY;
        this.spritePos = spritePos;
        this.clouds = [];
        this.cloudSpeed = this.config.BG_CLOUD_SPEED;
        this.horizonLine = null;
        this.init()
    };
    Horizon.config = {
        BG_CLOUD_SPEED: 0.2,
        BUMPY_THRESHOLD: .3,
        CLOUD_FREQUENCY: .5,
        HORIZON_HEIGHT: 16,
        MAX_CLOUDS: 6
    };
    Horizon.prototype = {
        init: function() {
            this.addCloud();
            this.horizonLine = new HorizonLine(this.canvas, this.spritePos.HORIZON)
        },
        update: function(deltaTime, currentSpeed, updateObstacles) {
            this.runningTime += deltaTime;
            this.horizonLine.update(deltaTime, currentSpeed);
            this.updateClouds(deltaTime, currentSpeed);
            if (updateObstacles) {
                this.updateObstacles(deltaTime, currentSpeed)
            }
        },
        updateClouds: function(deltaTime, speed) {
            var cloudSpeed = this.cloudSpeed / 1000 * deltaTime * speed;
            var numClouds = this.clouds.length;
            if (numClouds) {
                for (var i = numClouds - 1; i >= 0; i--) {
                    this.clouds[i].update(cloudSpeed)
                }
                var lastCloud = this.clouds[numClouds - 1];
                if (numClouds < this.config.MAX_CLOUDS && (this.dimensions.WIDTH - lastCloud.xPos) > lastCloud.cloudGap && this.cloudFrequency > Math.random()) {
                    this.addCloud()
                }
                this.clouds = this.clouds.filter(function(obj) {
                    return !obj.remove
                })
            }
        },
        updateObstacles: function(deltaTime, currentSpeed) {
            var updatedObstacles = this.obstacles.slice(0);
            for (var i = 0; i < this.obstacles.length; i++) {
                var obstacle = this.obstacles[i];
                obstacle.update(deltaTime, currentSpeed);
                if (obstacle.remove) {
                    updatedObstacles.shift()
                }
            }
            this.obstacles = updatedObstacles;
            if (this.obstacles.length > 0) {
                var lastObstacle = this.obstacles[this.obstacles.length - 1];
                if (lastObstacle && !lastObstacle.followingObstacleCreated && lastObstacle.isVisible() && (lastObstacle.xPos + lastObstacle.width + lastObstacle.gap) < this.dimensions.WIDTH) {
                    this.addNewObstacle(currentSpeed);
                    lastObstacle.followingObstacleCreated = true
                }
            } else {
                this.addNewObstacle(currentSpeed)
            }
        },
        addNewObstacle: function(currentSpeed) {
            var obstacleTypeIndex = getRandomNum(0, Obstacle.types.length - 1);
            var obstacleType = Obstacle.types[obstacleTypeIndex];
            if (this.duplicateObstacleCheck(obstacleType.type) || currentSpeed < obstacleType.minSpeed) {
                this.addNewObstacle(currentSpeed)
            } else {
                var obstacleSpritePos = this.spritePos[obstacleType.type];
                this.obstacles.push(new Obstacle(this.canvasCtx, obstacleType, obstacleSpritePos, this.dimensions, this.gapCoefficient, currentSpeed));
                this.obstacleHistory.unshift(obstacleType.type);
                if (this.obstacleHistory.length > 1) {
                    this.obstacleHistory.splice(Runner.config.MAX_OBSTACLE_DUPLICATION)
                }
            }
        },
        duplicateObstacleCheck: function(nextObstacleType) {
            var duplicateCount = 0;
            for (var i = 0; i < this.obstacleHistory.length; i++) {
                duplicateCount = this.obstacleHistory[i] == nextObstacleType ? duplicateCount + 1 : 0
            }
            return duplicateCount >= Runner.config.MAX_OBSTACLE_DUPLICATION
        },
        reset: function() {
            this.obstacles = [];
            this.horizonLine.reset()
        },
        resize: function(width, height) {
            this.canvas.width = width;
            this.canvas.height = height
        },
        addCloud: function() {
            this.clouds.push(new Cloud(this.canvas, this.spritePos.CLOUD, this.dimensions.WIDTH))
        }
    }
})();
new Runner('.interstitial-wrapper');