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Diffstat (limited to 'public/assets/Varsity/js/parallax.js')
| -rw-r--r-- | public/assets/Varsity/js/parallax.js | 550 |
1 files changed, 550 insertions, 0 deletions
diff --git a/public/assets/Varsity/js/parallax.js b/public/assets/Varsity/js/parallax.js new file mode 100644 index 0000000..421f040 --- /dev/null +++ b/public/assets/Varsity/js/parallax.js @@ -0,0 +1,550 @@ +/** + * 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); |
