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- /*!
- * Particleground
- *
- * @author Jonathan Nicol - @mrjnicol
- * @version 1.1.0
- * @description Creates a canvas based particle system background
- *
- * Inspired by http://requestlab.fr/ and http://disruptivebydesign.com/
- */
- ;(function(window, document) {
- "use strict";
- var pluginName = 'particleground';
- // http://youmightnotneedjquery.com/#deep_extend
- function extend(out) {
- out = out || {};
- for (var i = 1; i < arguments.length; i++) {
- var obj = arguments[i];
- if (!obj) continue;
- for (var key in obj) {
- if (obj.hasOwnProperty(key)) {
- if (typeof obj[key] === 'object')
- deepExtend(out[key], obj[key]);
- else
- out[key] = obj[key];
- }
- }
- }
- return out;
- };
- var $ = window.jQuery;
- function Plugin(element, options) {
- var canvasSupport = !!document.createElement('canvas').getContext;
- var canvas;
- var ctx;
- var particles = [];
- var raf;
- var mouseX = 0;
- var mouseY = 0;
- var winW;
- var winH;
- var desktop = !navigator.userAgent.match(/(iPhone|iPod|iPad|Android|BlackBerry|BB10|mobi|tablet|opera mini|nexus 7)/i);
- var orientationSupport = !!window.DeviceOrientationEvent;
- var tiltX = 0;
- var pointerX;
- var pointerY;
- var tiltY = 0;
- var paused = false;
- options = extend({}, window[pluginName].defaults, options);
- /**
- * Init
- */
- function init() {
- if (!canvasSupport) { return; }
- //Create canvas
- canvas = document.createElement('canvas');
- canvas.className = 'pg-canvas';
- canvas.style.display = 'block';
- element.insertBefore(canvas, element.firstChild);
- ctx = canvas.getContext('2d');
- styleCanvas();
- // Create particles
- var numParticles = Math.round((canvas.width * canvas.height) / options.density);
- for (var i = 0; i < numParticles; i++) {
- var p = new Particle();
- p.setStackPos(i);
- particles.push(p);
- };
- window.addEventListener('resize', function() {
- resizeHandler();
- }, false);
- document.addEventListener('mousemove', function(e) {
- mouseX = e.pageX;
- mouseY = e.pageY;
- }, false);
- if (orientationSupport && !desktop) {
- window.addEventListener('deviceorientation', function () {
- // Contrain tilt range to [-30,30]
- tiltY = Math.min(Math.max(-event.beta, -30), 30);
- tiltX = Math.min(Math.max(-event.gamma, -30), 30);
- }, true);
- }
- draw();
- hook('onInit');
- }
- /**
- * Style the canvas
- */
- // 550 = perfect width for menu
- function styleCanvas() {
- canvas.width = screen.width;
- canvas.height = screen.height;
- ctx.fillStyle = options.dotColor;
- ctx.strokeStyle = options.lineColor;
- ctx.lineWidth = options.lineWidth;
- }
- /**
- * Draw particles
- */
- function draw() {
- if (!canvasSupport) { return; }
- winW = window.innerWidth;
- winH = window.innerHeight;
- // Wipe canvas
- ctx.clearRect(0, 0, canvas.width, canvas.height);
- // Update particle positions
- for (var i = 0; i < particles.length; i++) {
- particles[i].updatePosition();
- };
- // Draw particles
- for (var i = 0; i < particles.length; i++) {
- particles[i].draw();
- };
- // Call this function next time screen is redrawn
- if (!paused) {
- raf = requestAnimationFrame(draw);
- }
- }
- /**
- * Add/remove particles.
- */
- function resizeHandler() {
- // Resize the canvas
- styleCanvas();
- var elWidth = element.offsetWidth;
- var elHeight = element.offsetHeight;
- // Remove particles that are outside the canvas
- for (var i = particles.length - 1; i >= 0; i--) {
- if (particles[i].position.x > elWidth || particles[i].position.y > elHeight) {
- particles.splice(i, 1);
- }
- };
- // Adjust particle density
- var numParticles = Math.round((canvas.width * canvas.height) / options.density);
- if (numParticles > particles.length) {
- while (numParticles > particles.length) {
- var p = new Particle();
- particles.push(p);
- }
- } else if (numParticles < particles.length) {
- particles.splice(numParticles);
- }
- // Re-index particles
- for (i = particles.length - 1; i >= 0; i--) {
- particles[i].setStackPos(i);
- };
- }
- /**
- * Pause particle system
- */
- function pause() {
- paused = true;
- }
- /**
- * Start particle system
- */
- function start() {
- paused = false;
- draw();
- }
- /**
- * Particle
- */
- function Particle() {
- this.stackPos;
- this.active = true;
- this.layer = Math.ceil(Math.random() * 3);
- this.parallaxOffsetX = 0;
- this.parallaxOffsetY = 0;
- // Initial particle position
- this.position = {
- x: Math.ceil(Math.random() * canvas.width),
- y: Math.ceil(Math.random() * canvas.height)
- }
- // Random particle speed, within min and max values
- this.speed = {}
- switch (options.directionX) {
- case 'left':
- this.speed.x = +(-options.maxSpeedX + (Math.random() * options.maxSpeedX) - options.minSpeedX).toFixed(2);
- break;
- case 'right':
- this.speed.x = +((Math.random() * options.maxSpeedX) + options.minSpeedX).toFixed(2);
- break;
- default:
- this.speed.x = +((-options.maxSpeedX / 2) + (Math.random() * options.maxSpeedX)).toFixed(2);
- this.speed.x += this.speed.x > 0 ? options.minSpeedX : -options.minSpeedX;
- break;
- }
- switch (options.directionY) {
- case 'up':
- this.speed.y = +(-options.maxSpeedY + (Math.random() * options.maxSpeedY) - options.minSpeedY).toFixed(2);
- break;
- case 'down':
- this.speed.y = +((Math.random() * options.maxSpeedY) + options.minSpeedY).toFixed(2);
- break;
- default:
- this.speed.y = +((-options.maxSpeedY / 2) + (Math.random() * options.maxSpeedY)).toFixed(2);
- this.speed.x += this.speed.y > 0 ? options.minSpeedY : -options.minSpeedY;
- break;
- }
- }
- /**
- * Draw particle
- */
- Particle.prototype.draw = function() {
- // Draw circle
- ctx.beginPath();
- ctx.arc(this.position.x + this.parallaxOffsetX, this.position.y + this.parallaxOffsetY, options.particleRadius / 2, 0, Math.PI * 2, true);
- ctx.closePath();
- ctx.fill();
- // Draw lines
- ctx.beginPath();
- // Iterate over all particles which are higher in the stack than this one
- for (var i = particles.length - 1; i > this.stackPos; i--) {
- var p2 = particles[i];
- // Pythagorus theorum to get distance between two points
- var a = this.position.x - p2.position.x
- var b = this.position.y - p2.position.y
- var dist = Math.sqrt((a * a) + (b * b)).toFixed(2);
- // If the two particles are in proximity, join them
- if (dist < options.proximity) {
- ctx.moveTo(this.position.x + this.parallaxOffsetX, this.position.y + this.parallaxOffsetY);
- if (options.curvedLines) {
- ctx.quadraticCurveTo(Math.max(p2.position.x, p2.position.x), Math.min(p2.position.y, p2.position.y), p2.position.x + p2.parallaxOffsetX, p2.position.y + p2.parallaxOffsetY);
- } else {
- ctx.lineTo(p2.position.x + p2.parallaxOffsetX, p2.position.y + p2.parallaxOffsetY);
- }
- }
- }
- ctx.stroke();
- ctx.closePath();
- }
- /**
- * update particle position
- */
- Particle.prototype.updatePosition = function() {
- if (options.parallax) {
- if (orientationSupport && !desktop) {
- // Map tiltX range [-30,30] to range [0,winW]
- var ratioX = (winW - 0) / (30 - -30);
- pointerX = (tiltX - -30) * ratioX + 0;
- // Map tiltY range [-30,30] to range [0,winH]
- var ratioY = (winH - 0) / (30 - -30);
- pointerY = (tiltY - -30) * ratioY + 0;
- } else {
- pointerX = mouseX;
- pointerY = mouseY;
- }
- // Calculate parallax offsets
- this.parallaxTargX = (pointerX - (winW / 2)) / (options.parallaxMultiplier * this.layer);
- this.parallaxOffsetX += (this.parallaxTargX - this.parallaxOffsetX) / 10; // Easing equation
- this.parallaxTargY = (pointerY - (winH / 2)) / (options.parallaxMultiplier * this.layer);
- this.parallaxOffsetY += (this.parallaxTargY - this.parallaxOffsetY) / 10; // Easing equation
- }
- var elWidth = element.offsetWidth;
- var elHeight = element.offsetHeight;
- switch (options.directionX) {
- case 'left':
- if (this.position.x + this.speed.x + this.parallaxOffsetX < 0) {
- this.position.x = elWidth - this.parallaxOffsetX;
- }
- break;
- case 'right':
- if (this.position.x + this.speed.x + this.parallaxOffsetX > elWidth) {
- this.position.x = 0 - this.parallaxOffsetX;
- }
- break;
- default:
- // If particle has reached edge of canvas, reverse its direction
- if (this.position.x + this.speed.x + this.parallaxOffsetX > elWidth || this.position.x + this.speed.x + this.parallaxOffsetX < 0) {
- this.speed.x = -this.speed.x;
- }
- break;
- }
- switch (options.directionY) {
- case 'up':
- if (this.position.y + this.speed.y + this.parallaxOffsetY < 0) {
- this.position.y = elHeight - this.parallaxOffsetY;
- }
- break;
- case 'down':
- if (this.position.y + this.speed.y + this.parallaxOffsetY > elHeight) {
- this.position.y = 0 - this.parallaxOffsetY;
- }
- break;
- default:
- // If particle has reached edge of canvas, reverse its direction
- if (this.position.y + this.speed.y + this.parallaxOffsetY > elHeight || this.position.y + this.speed.y + this.parallaxOffsetY < 0) {
- this.speed.y = -this.speed.y;
- }
- break;
- }
- // Move particle
- this.position.x += this.speed.x;
- this.position.y += this.speed.y;
- }
- /**
- * Setter: particle stacking position
- */
- Particle.prototype.setStackPos = function(i) {
- this.stackPos = i;
- }
- function option (key, val) {
- if (val) {
- options[key] = val;
- } else {
- return options[key];
- }
- }
- function destroy() {
- console.log('destroy');
- canvas.parentNode.removeChild(canvas);
- hook('onDestroy');
- if ($) {
- $(element).removeData('plugin_' + pluginName);
- }
- }
- function hook(hookName) {
- if (options[hookName] !== undefined) {
- options[hookName].call(element);
- }
- }
- init();
- return {
- option: option,
- destroy: destroy,
- start: start,
- pause: pause
- };
- }
- window[pluginName] = function(elem, options) {
- return new Plugin(elem, options);
- };
- window[pluginName].defaults = {
- minSpeedX: 0.1,
- maxSpeedX: 0.7,
- minSpeedY: 0.1,
- maxSpeedY: 0.7,
- directionX: 'center', // 'center', 'left' or 'right'. 'center' = dots bounce off edges
- directionY: 'center', // 'center', 'up' or 'down'. 'center' = dots bounce off edges
- density: 10000, // How many particles will be generated: one particle every n pixels
- dotColor: '#666666',
- lineColor: '#666666',
- particleRadius: 3, // Dot size
- lineWidth: 1,
- curvedLines: false,
- proximity: 120, // How close two dots need to be before they join
- parallax: false,
- parallaxMultiplier: 10, // The lower the number, the more extreme the parallax effect
- onInit: function() {},
- onDestroy: function() {}
- };
- // nothing wrong with hooking into jQuery if it's there...
- if ($) {
- $.fn[pluginName] = function(options) {
- if (typeof arguments[0] === 'string') {
- var methodName = arguments[0];
- var args = Array.prototype.slice.call(arguments, 1);
- var returnVal;
- this.each(function() {
- if ($.data(this, 'plugin_' + pluginName) && typeof $.data(this, 'plugin_' + pluginName)[methodName] === 'function') {
- returnVal = $.data(this, 'plugin_' + pluginName)[methodName].apply(this, args);
- }
- });
- if (returnVal !== undefined){
- return returnVal;
- } else {
- return this;
- }
- } else if (typeof options === "object" || !options) {
- return this.each(function() {
- if (!$.data(this, 'plugin_' + pluginName)) {
- $.data(this, 'plugin_' + pluginName, new Plugin(this, options));
- }
- });
- }
- };
- }
- })(window, document);
- /**
- * requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel
- * @see: http://paulirish.com/2011/requestanimationframe-for-smart-animating/
- * @see: http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
- * @license: MIT license
- */
- (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);
- };
- }());
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