86 lines
2.3 KiB
JavaScript
86 lines
2.3 KiB
JavaScript
/* http://paulirish.com/2011/requestanimationframe-for-smart-animating/ */
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window.requestAnimFrame = (function(){
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return window.requestAnimationFrame ||
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window.webkitRequestAnimationFrame ||
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window.mozRequestAnimationFrame ||
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window.oRequestAnimationFrame ||
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window.msRequestAnimationFrame ||
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function(/* function */ callback, /* DOMElement */ element){
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window.setTimeout(callback, 1000 / 20);
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};
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})();
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function Flash(x, y) {
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this.el = $('<img class="backgroundflash" src="images/flash.png"/>');
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this.el.css('left', (x-10)+'px');
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this.el.css('top', y+'px');
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$('body').append(this.el);
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var that = this;
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this.el.fadeOut(250, function() {
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that.el.detach();
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});
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}
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function Cloud() {
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this.lastUpdate = new Date().getTime();
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this.speedX = Math.random() * 200;
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if (Math.random() < 0.5) {
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this.x = -50;
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} else {
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this.speedX *= -1;
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this.x = $('body').innerWidth();
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}
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this.y = Math.floor(Math.random() * $('body').innerHeight());
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this.el = $('<img class="backgroundcloud" src="images/pixelcloud.png"/>');
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$('body').append(this.el);
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}
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Cloud.prototype.update = function() {
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var now = new Date().getTime();
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this.x += this.speedX * (now - this.lastUpdate) / 1000;
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this.lastUpdate = now;
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this.el.css('left', Math.floor(this.x) + 'px');
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this.el.css('top', this.y + 'px');
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if (this.isDone())
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this.el.detach();
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};
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Cloud.prototype.isDone = function() {
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return (this.x < -100) || (this.x > $('body').innerWidth());
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};
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var clouds = [];
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function stepClouds() {
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if (clouds.length < 23 && Math.random() < 0.1)
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clouds.push(new Cloud());
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clouds = clouds.filter(function(cloud) {
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cloud.update();
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return !cloud.isDone();
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});
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clouds.forEach(function(cloud1) {
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clouds.forEach(function(cloud2) {
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if (cloud1 !== cloud2 &&
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cloud1.x > cloud2.x - 40 &&
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cloud1.x < cloud2.x + 40 &&
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cloud1.y > cloud2.y - 72 &&
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cloud1.y < cloud2.y + 72 &&
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Math.random() < 0.01)
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new Flash(Math.floor((cloud1.x + cloud2.x) / 2),
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Math.max(cloud1.y, cloud2.y) + 40);
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});
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});
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requestAnimFrame(stepClouds, 'body');
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}
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$(document).ready(function() {
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setTimeout(stepClouds, 100);
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});
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