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+/**
+ * Parallax.js
+ * @author Matthew Wagerfield - @wagerfield
+ * @description Creates a parallax effect between an array of layers,
+ * driving the motion from the gyroscope output of a smartdevice.
+ * If no gyroscope is available, the cursor position is used.
+ */
+;(function(window, document, undefined) {
+
+ // Strict Mode
+ 'use strict';
+
+ // Constants
+ var NAME = 'Parallax';
+ var MAGIC_NUMBER = 30;
+ var DEFAULTS = {
+ relativeInput: false,
+ clipRelativeInput: false,
+ calibrationThreshold: 100,
+ calibrationDelay: 500,
+ supportDelay: 500,
+ calibrateX: false,
+ calibrateY: true,
+ invertX: true,
+ invertY: true,
+ limitX: false,
+ limitY: false,
+ scalarX: 10.0,
+ scalarY: 10.0,
+ frictionX: 0.1,
+ frictionY: 0.1,
+ originX: 0.5,
+ originY: 0.5,
+ pointerEvents: true,
+ precision: 1
+ };
+
+ function Parallax(element, options) {
+
+ // DOM Context
+ this.element = element;
+ this.layers = element.getElementsByClassName('layer');
+
+ // Data Extraction
+ var data = {
+ calibrateX: this.data(this.element, 'calibrate-x'),
+ calibrateY: this.data(this.element, 'calibrate-y'),
+ invertX: this.data(this.element, 'invert-x'),
+ invertY: this.data(this.element, 'invert-y'),
+ limitX: this.data(this.element, 'limit-x'),
+ limitY: this.data(this.element, 'limit-y'),
+ scalarX: this.data(this.element, 'scalar-x'),
+ scalarY: this.data(this.element, 'scalar-y'),
+ frictionX: this.data(this.element, 'friction-x'),
+ frictionY: this.data(this.element, 'friction-y'),
+ originX: this.data(this.element, 'origin-x'),
+ originY: this.data(this.element, 'origin-y'),
+ pointerEvents: this.data(this.element, 'pointer-events'),
+ precision: this.data(this.element, 'precision')
+ };
+
+ // Delete Null Data Values
+ for (var key in data) {
+ if (data[key] === null) delete data[key];
+ }
+
+ // Compose Settings Object
+ this.extend(this, DEFAULTS, options, data);
+
+ // States
+ this.calibrationTimer = null;
+ this.calibrationFlag = true;
+ this.enabled = false;
+ this.depthsX = [];
+ this.depthsY = [];
+ this.raf = null;
+
+ // Element Bounds
+ this.bounds = null;
+ this.ex = 0;
+ this.ey = 0;
+ this.ew = 0;
+ this.eh = 0;
+
+ // Element Center
+ this.ecx = 0;
+ this.ecy = 0;
+
+ // Element Range
+ this.erx = 0;
+ this.ery = 0;
+
+ // Calibration
+ this.cx = 0;
+ this.cy = 0;
+
+ // Input
+ this.ix = 0;
+ this.iy = 0;
+
+ // Motion
+ this.mx = 0;
+ this.my = 0;
+
+ // Velocity
+ this.vx = 0;
+ this.vy = 0;
+
+ // Callbacks
+ this.onMouseMove = this.onMouseMove.bind(this);
+ this.onDeviceOrientation = this.onDeviceOrientation.bind(this);
+ this.onOrientationTimer = this.onOrientationTimer.bind(this);
+ this.onCalibrationTimer = this.onCalibrationTimer.bind(this);
+ this.onAnimationFrame = this.onAnimationFrame.bind(this);
+ this.onWindowResize = this.onWindowResize.bind(this);
+
+ // Initialise
+ this.initialise();
+ }
+
+ Parallax.prototype.extend = function() {
+ if (arguments.length > 1) {
+ var master = arguments[0];
+ for (var i = 1, l = arguments.length; i < l; i++) {
+ var object = arguments[i];
+ for (var key in object) {
+ master[key] = object[key];
+ }
+ }
+ }
+ };
+
+ Parallax.prototype.data = function(element, name) {
+ return this.deserialize(element.getAttribute('data-'+name));
+ };
+
+ Parallax.prototype.deserialize = function(value) {
+ if (value === 'true') {
+ return true;
+ } else if (value === 'false') {
+ return false;
+ } else if (value === 'null') {
+ return null;
+ } else if (!isNaN(parseFloat(value)) && isFinite(value)) {
+ return parseFloat(value);
+ } else {
+ return value;
+ }
+ };
+
+ Parallax.prototype.camelCase = function(value) {
+ return value.replace(/-+(.)?/g, function(match, character){
+ return character ? character.toUpperCase() : '';
+ });
+ };
+
+ Parallax.prototype.transformSupport = function(value) {
+ var element = document.createElement('div');
+ var propertySupport = false;
+ var propertyValue = null;
+ var featureSupport = false;
+ var cssProperty = null;
+ var jsProperty = null;
+ for (var i = 0, l = this.vendors.length; i < l; i++) {
+ if (this.vendors[i] !== null) {
+ cssProperty = this.vendors[i][0] + 'transform';
+ jsProperty = this.vendors[i][1] + 'Transform';
+ } else {
+ cssProperty = 'transform';
+ jsProperty = 'transform';
+ }
+ if (element.style[jsProperty] !== undefined) {
+ propertySupport = true;
+ break;
+ }
+ }
+ switch(value) {
+ case '2D':
+ featureSupport = propertySupport;
+ break;
+ case '3D':
+ if (propertySupport) {
+ var body = document.body || document.createElement('body');
+ var documentElement = document.documentElement;
+ var documentOverflow = documentElement.style.overflow;
+ var isCreatedBody = false;
+ if (!document.body) {
+ isCreatedBody = true;
+ documentElement.style.overflow = 'hidden';
+ documentElement.appendChild(body);
+ body.style.overflow = 'hidden';
+ body.style.background = '';
+ }
+ body.appendChild(element);
+ element.style[jsProperty] = 'translate3d(1px,1px,1px)';
+ propertyValue = window.getComputedStyle(element).getPropertyValue(cssProperty);
+ featureSupport = propertyValue !== undefined && propertyValue.length > 0 && propertyValue !== 'none';
+ documentElement.style.overflow = documentOverflow;
+ body.removeChild(element);
+ if ( isCreatedBody ) {
+ body.removeAttribute('style');
+ body.parentNode.removeChild(body);
+ }
+ }
+ break;
+ }
+ return featureSupport;
+ };
+
+ Parallax.prototype.ww = null;
+ Parallax.prototype.wh = null;
+ Parallax.prototype.wcx = null;
+ Parallax.prototype.wcy = null;
+ Parallax.prototype.wrx = null;
+ Parallax.prototype.wry = null;
+ Parallax.prototype.portrait = null;
+ Parallax.prototype.desktop = !navigator.userAgent.match(/(iPhone|iPod|iPad|Android|BlackBerry|BB10|mobi|tablet|opera mini|nexus 7)/i);
+ Parallax.prototype.vendors = [null,['-webkit-','webkit'],['-moz-','Moz'],['-o-','O'],['-ms-','ms']];
+ Parallax.prototype.motionSupport = !!window.DeviceMotionEvent;
+ Parallax.prototype.orientationSupport = !!window.DeviceOrientationEvent;
+ Parallax.prototype.orientationStatus = 0;
+ Parallax.prototype.motionStatus = 0;
+ Parallax.prototype.propertyCache = {};
+
+ Parallax.prototype.initialise = function() {
+
+ if (Parallax.prototype.transform2DSupport === undefined) {
+ Parallax.prototype.transform2DSupport = Parallax.prototype.transformSupport('2D');
+ Parallax.prototype.transform3DSupport = Parallax.prototype.transformSupport('3D');
+ }
+
+ // Configure Context Styles
+ if (this.transform3DSupport) this.accelerate(this.element);
+ var style = window.getComputedStyle(this.element);
+ if (style.getPropertyValue('position') === 'static') {
+ this.element.style.position = 'relative';
+ }
+
+ // Pointer events
+ if(!this.pointerEvents){
+ this.element.style.pointerEvents = 'none';
+ }
+
+ // Setup
+ this.updateLayers();
+ this.updateDimensions();
+ this.enable();
+ this.queueCalibration(this.calibrationDelay);
+ };
+
+ Parallax.prototype.updateLayers = function() {
+
+ // Cache Layer Elements
+ this.layers = this.element.getElementsByClassName('layer');
+ this.depthsX = [];
+ this.depthsY = [];
+
+ // Configure Layer Styles
+ for (var i = 0, l = this.layers.length; i < l; i++) {
+ var layer = this.layers[i];
+ if (this.transform3DSupport) this.accelerate(layer);
+ layer.style.position = i ? 'absolute' : 'relative';
+ layer.style.display = 'block';
+ layer.style.left = 0;
+ layer.style.top = 0;
+
+ // Cache Layer Depth
+ //Graceful fallback on depth if depth-x or depth-y is absent
+ var depth = this.data(layer, 'depth') || 0;
+ this.depthsX.push(this.data(layer, 'depth-x') || depth);
+ this.depthsY.push(this.data(layer, 'depth-y') || depth);
+ }
+ };
+
+ Parallax.prototype.updateDimensions = function() {
+ this.ww = window.innerWidth;
+ this.wh = window.innerHeight;
+ this.wcx = this.ww * this.originX;
+ this.wcy = this.wh * this.originY;
+ this.wrx = Math.max(this.wcx, this.ww - this.wcx);
+ this.wry = Math.max(this.wcy, this.wh - this.wcy);
+ };
+
+ Parallax.prototype.updateBounds = function() {
+ this.bounds = this.element.getBoundingClientRect();
+ this.ex = this.bounds.left;
+ this.ey = this.bounds.top;
+ this.ew = this.bounds.width;
+ this.eh = this.bounds.height;
+ this.ecx = this.ew * this.originX;
+ this.ecy = this.eh * this.originY;
+ this.erx = Math.max(this.ecx, this.ew - this.ecx);
+ this.ery = Math.max(this.ecy, this.eh - this.ecy);
+ };
+
+ Parallax.prototype.queueCalibration = function(delay) {
+ clearTimeout(this.calibrationTimer);
+ this.calibrationTimer = setTimeout(this.onCalibrationTimer, delay);
+ };
+
+ Parallax.prototype.enable = function() {
+ if (!this.enabled) {
+ this.enabled = true;
+ if (!this.desktop && this.orientationSupport) {
+ this.portrait = null;
+ window.addEventListener('deviceorientation', this.onDeviceOrientation);
+ setTimeout(this.onOrientationTimer, this.supportDelay);
+ }
+ else if (!this.desktop && this.motionSupport) {
+ this.portrait = null;
+ window.addEventListener('devicemotion', this.onDeviceMotion);
+ setTimeout(this.onMotionTimer, this.supportDelay);
+ }
+ else {
+ this.cx = 0;
+ this.cy = 0;
+ this.portrait = false;
+ window.addEventListener('mousemove', this.onMouseMove);
+ }
+ window.addEventListener('resize', this.onWindowResize);
+ this.raf = requestAnimationFrame(this.onAnimationFrame);
+ }
+ };
+
+ Parallax.prototype.disable = function() {
+ if (this.enabled) {
+ this.enabled = false;
+ if (this.orientationSupport) {
+ window.removeEventListener('deviceorientation', this.onDeviceOrientation);
+ }
+ else if (this.motionSupport) {
+ window.removeEventListener('devicemotion', this.onDeviceMotion);
+ }
+ else {
+ window.removeEventListener('mousemove', this.onMouseMove);
+ }
+ window.removeEventListener('resize', this.onWindowResize);
+ cancelAnimationFrame(this.raf);
+ }
+ };
+
+ Parallax.prototype.calibrate = function(x, y) {
+ this.calibrateX = x === undefined ? this.calibrateX : x;
+ this.calibrateY = y === undefined ? this.calibrateY : y;
+ };
+
+ Parallax.prototype.invert = function(x, y) {
+ this.invertX = x === undefined ? this.invertX : x;
+ this.invertY = y === undefined ? this.invertY : y;
+ };
+
+ Parallax.prototype.friction = function(x, y) {
+ this.frictionX = x === undefined ? this.frictionX : x;
+ this.frictionY = y === undefined ? this.frictionY : y;
+ };
+
+ Parallax.prototype.scalar = function(x, y) {
+ this.scalarX = x === undefined ? this.scalarX : x;
+ this.scalarY = y === undefined ? this.scalarY : y;
+ };
+
+ Parallax.prototype.limit = function(x, y) {
+ this.limitX = x === undefined ? this.limitX : x;
+ this.limitY = y === undefined ? this.limitY : y;
+ };
+
+ Parallax.prototype.origin = function(x, y) {
+ this.originX = x === undefined ? this.originX : x;
+ this.originY = y === undefined ? this.originY : y;
+ };
+
+ Parallax.prototype.clamp = function(value, min, max) {
+ value = Math.max(value, min);
+ value = Math.min(value, max);
+ return value;
+ };
+
+ Parallax.prototype.css = function(element, property, value) {
+ var jsProperty = this.propertyCache[property];
+ if (!jsProperty) {
+ for (var i = 0, l = this.vendors.length; i < l; i++) {
+ if (this.vendors[i] !== null) {
+ jsProperty = this.camelCase(this.vendors[i][1] + '-' + property);
+ } else {
+ jsProperty = property;
+ }
+ if (element.style[jsProperty] !== undefined) {
+ this.propertyCache[property] = jsProperty;
+ break;
+ }
+ }
+ }
+ element.style[jsProperty] = value;
+ };
+
+ Parallax.prototype.accelerate = function(element) {
+ this.css(element, 'transform', 'translate3d(0,0,0) rotate(0.0001deg)');
+ this.css(element, 'transform-style', 'preserve-3d');
+ this.css(element, 'backface-visibility', 'hidden');
+ };
+
+ Parallax.prototype.setPosition = function(element, x, y) {
+ x = x.toFixed(this.precision) + 'px';
+ y = y.toFixed(this.precision) + 'px';
+ if (this.transform3DSupport) {
+ this.css(element, 'transform', 'translate3d('+x+','+y+',0)');
+ } else if (this.transform2DSupport) {
+ this.css(element, 'transform', 'translate('+x+','+y+')');
+ } else {
+ element.style.left = x;
+ element.style.top = y;
+ }
+ };
+
+ Parallax.prototype.onOrientationTimer = function() {
+ if (this.orientationSupport && this.orientationStatus === 0) {
+ this.disable();
+ this.orientationSupport = false;
+ this.enable();
+ }
+ };
+
+ Parallax.prototype.onMotionTimer = function() {
+ if (this.motionSupport && this.motionStatus === 0) {
+ this.disable();
+ this.motionSupport = false;
+ this.enable();
+ }
+ };
+
+ Parallax.prototype.onCalibrationTimer = function() {
+ this.calibrationFlag = true;
+ };
+
+ Parallax.prototype.onWindowResize = function() {
+ this.updateDimensions();
+ };
+
+ Parallax.prototype.onAnimationFrame = function() {
+ this.updateBounds();
+ var dx = this.ix - this.cx;
+ var dy = this.iy - this.cy;
+ if ((Math.abs(dx) > this.calibrationThreshold) || (Math.abs(dy) > this.calibrationThreshold)) {
+ this.queueCalibration(0);
+ }
+ if (this.portrait) {
+ this.mx = this.calibrateX ? dy : this.iy;
+ this.my = this.calibrateY ? dx : this.ix;
+ } else {
+ this.mx = this.calibrateX ? dx : this.ix;
+ this.my = this.calibrateY ? dy : this.iy;
+ }
+ this.mx *= this.ew * (this.scalarX / 100);
+ this.my *= this.eh * (this.scalarY / 100);
+ if (!isNaN(parseFloat(this.limitX))) {
+ this.mx = this.clamp(this.mx, -this.limitX, this.limitX);
+ }
+ if (!isNaN(parseFloat(this.limitY))) {
+ this.my = this.clamp(this.my, -this.limitY, this.limitY);
+ }
+ this.vx += (this.mx - this.vx) * this.frictionX;
+ this.vy += (this.my - this.vy) * this.frictionY;
+ for (var i = 0, l = this.layers.length; i < l; i++) {
+ var layer = this.layers[i];
+ var depthX = this.depthsX[i];
+ var depthY = this.depthsY[i];
+ var xOffset = this.vx * (depthX * (this.invertX ? -1 : 1));
+ var yOffset = this.vy * (depthY * (this.invertY ? -1 : 1));
+ this.setPosition(layer, xOffset, yOffset);
+ }
+ this.raf = requestAnimationFrame(this.onAnimationFrame);
+ };
+
+ Parallax.prototype.rotate = function(beta,gamma){
+ // Extract Rotation
+ var x = (event.beta || 0) / MAGIC_NUMBER; // -90 :: 90
+ var y = (event.gamma || 0) / MAGIC_NUMBER; // -180 :: 180
+
+ // Detect Orientation Change
+ var portrait = this.wh > this.ww;
+ if (this.portrait !== portrait) {
+ this.portrait = portrait;
+ this.calibrationFlag = true;
+ }
+
+ // Set Calibration
+ if (this.calibrationFlag) {
+ this.calibrationFlag = false;
+ this.cx = x;
+ this.cy = y;
+ }
+
+ // Set Input
+ this.ix = x;
+ this.iy = y;
+ }
+ Parallax.prototype.onDeviceOrientation = function(event) {
+ // Validate environment and event properties.
+ var beta = event.beta;
+ var gamma = event.gamma;
+ if (!this.desktop && beta !== null && gamma !== null) {
+ // Set orientation status.
+ this.orientationStatus = 1;
+ this.rotate(beta,gamma);
+ }
+ };
+
+ Parallax.prototype.onDeviceMotion = function(event) {
+ // Validate environment and event properties.
+ var beta = event.rotationRate.beta;
+ var gamma = event.rotationRate.gamma;
+ if (!this.desktop && beta !== null && gamma !== null) {
+ // Set motion status.
+ this.motionStatus = 1;
+ this.rotate(beta,gamma);
+ }
+ };
+
+ Parallax.prototype.onMouseMove = function(event) {
+ // Cache mouse coordinates.
+ var clientX = event.clientX;
+ var clientY = event.clientY;
+
+ // Calculate Mouse Input
+ if (!this.orientationSupport && this.relativeInput) {
+
+ // Clip mouse coordinates inside element bounds.
+ if (this.clipRelativeInput) {
+ clientX = Math.max(clientX, this.ex);
+ clientX = Math.min(clientX, this.ex + this.ew);
+ clientY = Math.max(clientY, this.ey);
+ clientY = Math.min(clientY, this.ey + this.eh);
+ }
+
+ // Calculate input relative to the element.
+ this.ix = (clientX - this.ex - this.ecx) / this.erx;
+ this.iy = (clientY - this.ey - this.ecy) / this.ery;
+
+ } else {
+
+ // Calculate input relative to the window.
+ this.ix = (clientX - this.wcx) / this.wrx;
+ this.iy = (clientY - this.wcy) / this.wry;
+ }
+ };
+
+ // Expose Parallax
+ window[NAME] = Parallax;
+
+})(window, document);