454 lines
14 KiB
JavaScript
454 lines
14 KiB
JavaScript
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/*!
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* Particleground
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*
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* @author Jonathan Nicol - @mrjnicol
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* @version 1.1.0
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* @description Creates a canvas based particle system background
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*
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* Inspired by http://requestlab.fr/ and http://disruptivebydesign.com/
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*/
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;(function(window, document) {
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"use strict";
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var pluginName = 'particleground';
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// http://youmightnotneedjquery.com/#deep_extend
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function extend(out) {
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out = out || {};
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for (var i = 1; i < arguments.length; i++) {
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var obj = arguments[i];
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if (!obj) continue;
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for (var key in obj) {
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if (obj.hasOwnProperty(key)) {
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if (typeof obj[key] === 'object')
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deepExtend(out[key], obj[key]);
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else
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out[key] = obj[key];
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}
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}
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}
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return out;
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};
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var $ = window.jQuery;
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function Plugin(element, options) {
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var canvasSupport = !!document.createElement('canvas').getContext;
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var canvas;
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var ctx;
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var particles = [];
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var raf;
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var mouseX = 0;
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var mouseY = 0;
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var winW;
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var winH;
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var desktop = !navigator.userAgent.match(/(iPhone|iPod|iPad|Android|BlackBerry|BB10|mobi|tablet|opera mini|nexus 7)/i);
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var orientationSupport = !!window.DeviceOrientationEvent;
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var tiltX = 0;
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var pointerX;
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var pointerY;
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var tiltY = 0;
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var paused = false;
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options = extend({}, window[pluginName].defaults, options);
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/**
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* Init
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*/
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function init() {
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if (!canvasSupport) { return; }
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//Create canvas
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canvas = document.createElement('canvas');
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canvas.className = 'pg-canvas';
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canvas.style.display = 'block';
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element.insertBefore(canvas, element.firstChild);
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ctx = canvas.getContext('2d');
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styleCanvas();
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// Create particles
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var numParticles = Math.round((canvas.width * canvas.height) / options.density);
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for (var i = 0; i < numParticles; i++) {
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var p = new Particle();
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p.setStackPos(i);
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particles.push(p);
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};
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window.addEventListener('resize', function() {
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resizeHandler();
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}, false);
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document.addEventListener('mousemove', function(e) {
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mouseX = e.pageX;
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mouseY = e.pageY;
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}, false);
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if (orientationSupport && !desktop) {
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window.addEventListener('deviceorientation', function () {
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// Contrain tilt range to [-30,30]
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tiltY = Math.min(Math.max(-event.beta, -30), 30);
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tiltX = Math.min(Math.max(-event.gamma, -30), 30);
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}, true);
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}
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draw();
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hook('onInit');
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}
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/**
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* Style the canvas
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*/
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function styleCanvas() {
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canvas.width = element.offsetWidth;
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canvas.height = element.offsetHeight;
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ctx.fillStyle = options.dotColor;
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ctx.strokeStyle = options.lineColor;
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ctx.lineWidth = options.lineWidth;
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}
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/**
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* Draw particles
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*/
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function draw() {
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if (!canvasSupport) { return; }
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winW = window.innerWidth;
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winH = window.innerHeight;
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// Wipe canvas
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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// Update particle positions
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for (var i = 0; i < particles.length; i++) {
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particles[i].updatePosition();
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};
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// Draw particles
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for (var i = 0; i < particles.length; i++) {
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particles[i].draw();
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};
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// Call this function next time screen is redrawn
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if (!paused) {
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raf = requestAnimationFrame(draw);
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}
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}
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/**
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* Add/remove particles.
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*/
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function resizeHandler() {
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// Resize the canvas
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styleCanvas();
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var elWidth = element.offsetWidth;
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var elHeight = element.offsetHeight;
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// Remove particles that are outside the canvas
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for (var i = particles.length - 1; i >= 0; i--) {
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if (particles[i].position.x > elWidth || particles[i].position.y > elHeight) {
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particles.splice(i, 1);
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}
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};
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// Adjust particle density
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var numParticles = Math.round((canvas.width * canvas.height) / options.density);
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if (numParticles > particles.length) {
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while (numParticles > particles.length) {
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var p = new Particle();
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particles.push(p);
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}
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} else if (numParticles < particles.length) {
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particles.splice(numParticles);
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}
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// Re-index particles
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for (i = particles.length - 1; i >= 0; i--) {
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particles[i].setStackPos(i);
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};
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}
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/**
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* Pause particle system
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*/
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function pause() {
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paused = true;
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}
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/**
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* Start particle system
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*/
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function start() {
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paused = false;
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draw();
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}
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/**
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* Particle
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*/
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function Particle() {
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this.stackPos;
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this.active = true;
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this.layer = Math.ceil(Math.random() * 3);
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this.parallaxOffsetX = 0;
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this.parallaxOffsetY = 0;
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// Initial particle position
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this.position = {
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x: Math.ceil(Math.random() * canvas.width),
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y: Math.ceil(Math.random() * canvas.height)
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}
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// Random particle speed, within min and max values
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this.speed = {}
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switch (options.directionX) {
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case 'left':
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this.speed.x = +(-options.maxSpeedX + (Math.random() * options.maxSpeedX) - options.minSpeedX).toFixed(2);
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break;
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case 'right':
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this.speed.x = +((Math.random() * options.maxSpeedX) + options.minSpeedX).toFixed(2);
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break;
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default:
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this.speed.x = +((-options.maxSpeedX / 2) + (Math.random() * options.maxSpeedX)).toFixed(2);
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this.speed.x += this.speed.x > 0 ? options.minSpeedX : -options.minSpeedX;
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break;
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}
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switch (options.directionY) {
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case 'up':
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this.speed.y = +(-options.maxSpeedY + (Math.random() * options.maxSpeedY) - options.minSpeedY).toFixed(2);
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break;
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case 'down':
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this.speed.y = +((Math.random() * options.maxSpeedY) + options.minSpeedY).toFixed(2);
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break;
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default:
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this.speed.y = +((-options.maxSpeedY / 2) + (Math.random() * options.maxSpeedY)).toFixed(2);
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this.speed.x += this.speed.y > 0 ? options.minSpeedY : -options.minSpeedY;
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break;
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}
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}
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/**
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* Draw particle
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*/
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Particle.prototype.draw = function() {
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// Draw circle
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ctx.beginPath();
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ctx.arc(this.position.x + this.parallaxOffsetX, this.position.y + this.parallaxOffsetY, options.particleRadius / 2, 0, Math.PI * 2, true);
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ctx.closePath();
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ctx.fill();
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// Draw lines
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ctx.beginPath();
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// Iterate over all particles which are higher in the stack than this one
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for (var i = particles.length - 1; i > this.stackPos; i--) {
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var p2 = particles[i];
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// Pythagorus theorum to get distance between two points
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var a = this.position.x - p2.position.x
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var b = this.position.y - p2.position.y
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var dist = Math.sqrt((a * a) + (b * b)).toFixed(2);
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// If the two particles are in proximity, join them
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if (dist < options.proximity) {
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ctx.moveTo(this.position.x + this.parallaxOffsetX, this.position.y + this.parallaxOffsetY);
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if (options.curvedLines) {
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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);
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} else {
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ctx.lineTo(p2.position.x + p2.parallaxOffsetX, p2.position.y + p2.parallaxOffsetY);
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}
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}
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}
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ctx.stroke();
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ctx.closePath();
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}
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/**
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* update particle position
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*/
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Particle.prototype.updatePosition = function() {
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if (options.parallax) {
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if (orientationSupport && !desktop) {
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// Map tiltX range [-30,30] to range [0,winW]
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var ratioX = (winW - 0) / (30 - -30);
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pointerX = (tiltX - -30) * ratioX + 0;
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// Map tiltY range [-30,30] to range [0,winH]
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var ratioY = (winH - 0) / (30 - -30);
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pointerY = (tiltY - -30) * ratioY + 0;
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} else {
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pointerX = mouseX;
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pointerY = mouseY;
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}
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// Calculate parallax offsets
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this.parallaxTargX = (pointerX - (winW / 2)) / (options.parallaxMultiplier * this.layer);
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this.parallaxOffsetX += (this.parallaxTargX - this.parallaxOffsetX) / 10; // Easing equation
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this.parallaxTargY = (pointerY - (winH / 2)) / (options.parallaxMultiplier * this.layer);
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this.parallaxOffsetY += (this.parallaxTargY - this.parallaxOffsetY) / 10; // Easing equation
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}
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var elWidth = element.offsetWidth;
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var elHeight = element.offsetHeight;
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switch (options.directionX) {
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case 'left':
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if (this.position.x + this.speed.x + this.parallaxOffsetX < 0) {
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this.position.x = elWidth - this.parallaxOffsetX;
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}
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break;
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case 'right':
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if (this.position.x + this.speed.x + this.parallaxOffsetX > elWidth) {
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this.position.x = 0 - this.parallaxOffsetX;
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}
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break;
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default:
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// If particle has reached edge of canvas, reverse its direction
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if (this.position.x + this.speed.x + this.parallaxOffsetX > elWidth || this.position.x + this.speed.x + this.parallaxOffsetX < 0) {
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this.speed.x = -this.speed.x;
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}
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break;
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}
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switch (options.directionY) {
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case 'up':
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if (this.position.y + this.speed.y + this.parallaxOffsetY < 0) {
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this.position.y = elHeight - this.parallaxOffsetY;
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}
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break;
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case 'down':
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if (this.position.y + this.speed.y + this.parallaxOffsetY > elHeight) {
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this.position.y = 0 - this.parallaxOffsetY;
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}
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break;
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default:
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// If particle has reached edge of canvas, reverse its direction
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if (this.position.y + this.speed.y + this.parallaxOffsetY > elHeight || this.position.y + this.speed.y + this.parallaxOffsetY < 0) {
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this.speed.y = -this.speed.y;
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}
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break;
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}
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// Move particle
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this.position.x += this.speed.x;
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this.position.y += this.speed.y;
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}
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/**
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* Setter: particle stacking position
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*/
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Particle.prototype.setStackPos = function(i) {
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this.stackPos = i;
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}
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function option (key, val) {
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if (val) {
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options[key] = val;
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} else {
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return options[key];
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}
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}
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function destroy() {
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console.log('destroy');
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canvas.parentNode.removeChild(canvas);
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hook('onDestroy');
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if ($) {
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$(element).removeData('plugin_' + pluginName);
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}
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}
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function hook(hookName) {
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if (options[hookName] !== undefined) {
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options[hookName].call(element);
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}
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}
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init();
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return {
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option: option,
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destroy: destroy,
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start: start,
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pause: pause
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};
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}
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window[pluginName] = function(elem, options) {
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return new Plugin(elem, options);
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};
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window[pluginName].defaults = {
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minSpeedX: 0.1,
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maxSpeedX: 0.7,
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minSpeedY: 0.1,
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maxSpeedY: 0.7,
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directionX: 'center', // 'center', 'left' or 'right'. 'center' = dots bounce off edges
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directionY: 'center', // 'center', 'up' or 'down'. 'center' = dots bounce off edges
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density: 10000, // How many particles will be generated: one particle every n pixels
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dotColor: '#666666',
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||
|
|
lineColor: '#666666',
|
||
|
|
particleRadius: 7, // Dot size
|
||
|
|
lineWidth: 1,
|
||
|
|
curvedLines: false,
|
||
|
|
proximity: 100, // How close two dots need to be before they join
|
||
|
|
parallax: true,
|
||
|
|
parallaxMultiplier: 5, // 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);
|
||
|
|
};
|
||
|
|
}());
|