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Created August 15, 2012 11:09
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A web page created at CodePen.io.
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!-- IF PEN IS PRIVATE -->
<!-- <meta name="robots" content="noindex"> -->
<!-- END -->
<title>Canvas Vertical Light &middot; CodePen</title>
<!--
Copyright (c) 2012 Jack Rugile, http://codepen.io/jackrugile
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-->
<link rel="stylesheet" href="http://codepen.io/stylesheets/css/reset.css">
<style>
body {
background: #000;
}
canvas {
display: block;
}
</style>
<style>
#codepen-footer, #codepen-footer * {
-webkit-box-sizing: border-box !important;
-moz-box-sizing: border-box !important;
box-sizing: border-box !important;
}
#codepen-footer {
display: block !important;
position: fixed !important;
top: auto !important;
bottom: 0 !important;
left: 0 !important;
right: auto !important;
width: 100% !important;
padding: 0 10px !important;
margin: 0 !important;
height: 30px !important;
line-height: 30px !important;
font-size: 12px !important;
color: #eeeeee !important;
background-color: #505050 !important;
text-align: left !important;
background: -webkit-linear-gradient(top, #505050, #383838) !important;
background: -moz-linear-gradient(top, #505050, #383838) !important;
background: -ms-linear-gradient(top, #505050, #383838) !important;
background: -o-linear-gradient(top, #505050, #383838) !important;
border-top: 1px solid black !important;
border-bottom: 1px solid black !important;
border-radius: 0 !important;
border-image: none !important;
box-shadow: inset 0 1px 0 #6e6e6e, 0 2px 2px rgba(0, 0, 0, 0.4) !important;
z-index: 300 !important;
font-family: "Lucida Grande", "Lucida Sans Unicode", Tahoma, sans-serif !important;
letter-spacing: 0 !important;
word-spacing: normal !important;
word-spacing: 0 !important;
-webkit-transform: none !important;
-moz-transform: none !important;
-ms-transform: none !important;
-o-transform: none !important;
transform: none !important;
}
#codepen-footer a {
color: #a7a7a7 !important;
text-decoration: none !important;
text-shadow: none !important;
border: 0 !important;
}
#codepen-footer a:hover {
color: white !important;
}
#codepen-footer:before,
#codepen-footer:after {
display: none;
}
</style>
<script>
// Kill alerts, confirmations and prompts
// window.alert = function(){}; we're going to allow alerts for now
window.confirm = function(){};
window.prompt = function(){};
window.open = function(){};
window.print = function(){};
</script>
<script src="http://codepen.io/javascripts/libs/prefixfree.min.js"></script>
</head>
<body>
<!-- click to clear! -->
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
(function() {
var c = document.createElement('canvas'),
ctx = c.getContext('2d'),
cw = c.width = window.innerWidth,
ch = c.height = window.innerHeight,
rand = function(a,b){return ~~((Math.random()*(b-a+1))+a);},
crawlers = [],
crawlCount = 100,
Crawler = function(arg){
this.x = arg.x || cw / 2;
this.y = arg.y || ch / 2;
this.lx = arg.x || cw / 2;
this.ly = arg.y || ch / 2;
this.vx = arg.vx || 0;
this.vy = arg.vy || 0;
this.hue = arg.hue || 0;
this.saturation = arg.saturation || 75;
this.lightness = arg.lightness || 30;
this.alpha = arg.alpha || .5;
this.width = arg.width || .5;
},
updateCrawlers = function(){
var i = crawlers.length;
while(i--){crawlers[i].update()}
},
renderCrawlers = function(){
var i = crawlers.length;
while(i--){crawlers[i].render()}
},
clear = function(){
ctx.clearRect(0, 0, cw, ch);
},
loop = function(){
//clear();
updateCrawlers();
renderCrawlers();
}
Crawler.prototype = {
update: function(){
this.lx = this.x;
this.ly = this.y;
this.vx += (rand(0, 1000) - 500) / 10000;
this.vy += (rand(0, 1000) - 500) / 1000;
this.x += this.vx;
this.y += this.vy;
if(this.x >= cw || this.x <= 0){
this.vx = -this.vx;
}
if(this.y >= ch || this.y <= 0){
this.vy = -this.vy;
}
},
render: function(){
ctx.beginPath();
ctx.moveTo(this.x, this.y);
ctx.lineTo(this.x, ch);
ctx.lineWidth = this.width;
ctx.strokeStyle = 'hsla('+this.hue+', '+this.saturation+'%, '+this.lightness+'%, '+this.alpha+')';
ctx.stroke();
}
}
while(crawlCount--){
crawlers.push(new Crawler({
y: ch,
hue: rand(60, 180),
saturation: 75,
lightness: rand(1, 30),
alpha: rand(5, 10)/100,
width: rand(50, 200)/100
}));
}
$(window).click(clear);
ctx.globalCompositeOperation = 'lighter';
document.body.appendChild(c);
setInterval(loop, 16);
})();
</script>
<div id="codepen-footer">
<a style="color: #f73535 !important;" href="https://codepen.wufoo.com/forms/m7x3r3/def/field14=" target="_blank">Report Abuse</a>
&nbsp;
<a href="/jackrugile/pen/jqwHE" target="_blank">Edit this Pen</a>
</div>
<script>
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-30102653-1']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>
</body>
</html>
Raw
index.js
var c = document.createElement('canvas'),
ctx = c.getContext('2d'),
cw = c.width = window.innerWidth,
ch = c.height = window.innerHeight,
rand = function(a,b){return ~~((Math.random()*(b-a+1))+a);},
crawlers = [],
crawlCount = 100,
Crawler = function(arg){
this.x = arg.x || cw / 2;
this.y = arg.y || ch / 2;
this.lx = arg.x || cw / 2;
this.ly = arg.y || ch / 2;
this.vx = arg.vx || 0;
this.vy = arg.vy || 0;
this.hue = arg.hue || 0;
this.saturation = arg.saturation || 75;
this.lightness = arg.lightness || 30;
this.alpha = arg.alpha || .5;
this.width = arg.width || .5;
},
updateCrawlers = function(){
var i = crawlers.length;
while(i--){crawlers[i].update()}
},
renderCrawlers = function(){
var i = crawlers.length;
while(i--){crawlers[i].render()}
},
clear = function(){
ctx.clearRect(0, 0, cw, ch);
},
loop = function(){
//clear();
updateCrawlers();
renderCrawlers();
}
Crawler.prototype = {
update: function(){
this.lx = this.x;
this.ly = this.y;
this.vx += (rand(0, 1000) - 500) / 10000;
this.vy += (rand(0, 1000) - 500) / 1000;
this.x += this.vx;
this.y += this.vy;
if(this.x >= cw || this.x <= 0){
this.vx = -this.vx;
}
if(this.y >= ch || this.y <= 0){
this.vy = -this.vy;
}
},
render: function(){
ctx.beginPath();
ctx.moveTo(this.x, this.y);
ctx.lineTo(this.x, ch);
ctx.lineWidth = this.width;
ctx.strokeStyle = 'hsla('+this.hue+', '+this.saturation+'%, '+this.lightness+'%, '+this.alpha+')';
ctx.stroke();
}
}
while(crawlCount--){
crawlers.push(new Crawler({
y: ch,
hue: rand(60, 180),
saturation: 75,
lightness: rand(1, 30),
alpha: rand(5, 10)/100,
width: rand(50, 200)/100
}));
}
$(window).click(clear);
ctx.globalCompositeOperation = 'lighter';
document.body.appendChild(c);
setInterval(loop, 16);
Raw
markup.html
<!-- click to clear! -->
Raw
style.css
body {
background: #000;
}
canvas {
display: block;
}
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