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Created July 27, 2012 00:44
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Strings
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Strings &middot; CodePen</title>
<!--
Copyright (c) 2012 Jonathan Sampson, http://codepen.io/jonathansampson
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.
-->
<style>
body { margin: 0 }
html { overflow: hidden }
h1 {
position: absolute;
top: 0; left: 0;
width: 100%;
margin: 0;
padding: 10px;
font: 12px normal 'arial';
color: lightblue;
text-shadow: 0 35px 10px rgba(0,0,0,.75);
text-align: left;
}
h1 a {
text-decoration: none;
color: white;
}
</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;
bottom: 0 !important;
left: 0 !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;
}
</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>
<h1>
<a href="http://twitter.com/jonathansampson">
@jonathansampson
</a>
</h1>
<canvas id="canvas"></canvas>
<script src="http://codepen.io/javascripts/libs/modernizr.js"></script>
<script>
(function() {
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var W = canvas.width = window.innerWidth;
var H = canvas.height = window.innerHeight;
var padding = 20;
var points = [];
var count = 100;
var distance = 100;
/* Find requestAnimationFrame if possible */
window.requestAnimFrame = (function () {
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function ( c ) {
window.setTimeout( c, 16.6 );
};
})();
/* Add our points to the point collection */
while ( count-- ) points.push( new point() );
/* Define the properties and behavior of a point */
function point () {
/* For preserving 'this' for this.update */
var self = this;
self.pos = {
x: Math.random() * ( W - padding * 2 ) + padding,
y: Math.random() * ( H - padding * 2 ) + padding,
update: function () {
if ( self.pos.x < padding || self.pos.x > W - padding ) self.vel.x *= -1;
if ( self.pos.y < padding || self.pos.y > H - padding ) self.vel.y *= -1;
self.pos.x += self.vel.x;
self.pos.y += self.vel.y;
}
};
self.vel = {
x: 2 * ( Math.random() < .5 ? -1 : 1 ),
y: 2 * ( Math.random() < .5 ? -1 : 1 )
};
self.clr = {
r: Math.round( Math.random() * 255 ),
g: Math.round( Math.random() * 255 ),
b: Math.round( Math.random() * 255 )
};
}
/* Our drawing function, gets called up to 60fps */
function draw () {
/* Paint canvas single color */
ctx.fillStyle = "rgba(17,34,51,1)";
ctx.fillRect( 0, 0, W, H );
/* Draw our strings */
ctx.lineWidth = 1;
/* Cycle over every point */
points.forEach(function(p){
/* Compare each point to current point */
points.forEach(function(q){
/* Find distance between two points */
var xd = p.pos.x - q.pos.x;
var yd = p.pos.y - q.pos.y;
var dist = Math.sqrt( xd*xd + yd*yd );
/* If under threshold, draw connecting line */
if ( dist < distance ) {
/* Line intensity based on proximity */
var alpha = 1 - dist / distance;
/* Draw shadow */
ctx.strokeStyle = "rgba(0,0,0," + ( alpha * .2 ) + ")";
ctx.beginPath();
ctx.moveTo( p.pos.x, p.pos.y * 1.2 );
ctx.lineTo( q.pos.x, q.pos.y * 1.2 );
ctx.stroke();
/* Draw string */
ctx.strokeStyle = "rgba(%r,%g,%b,%a)".replace(/%([a-z])/g, function( m, v ) {
return v === "a" ? alpha : p.clr[ v ] ;
});
ctx.beginPath();
ctx.moveTo( p.pos.x, p.pos.y );
ctx.lineTo( q.pos.x, q.pos.y );
ctx.stroke();
}
});
/* Update location of point for next frame */
p.pos.update();
});
/* Queue up the next frame */
requestAnimFrame( draw );
}
/* Invoke animation */
requestAnimFrame( draw );
})();
</script>
<div id="codepen-footer">
<a style="color: #f73535 !important;" href="https://codepen.wufoo.com/forms/m7x3r3/def/field14=" onclick="window.open(this.href, null, 'height=517, width=680, toolbar=0, location=0, status=1, scrollbars=1, resizable=1'); return false">Report Abuse</a>
&nbsp;
<a href="/jonathansampson/pen/Lzths" target="_blank">Edit this Pen</a>
</div>
</body>
</html>
Raw
index.js
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var W = canvas.width = window.innerWidth;
var H = canvas.height = window.innerHeight;
var padding = 20;
var points = [];
var count = 100;
var distance = 100;
/* Find requestAnimationFrame if possible */
window.requestAnimFrame = (function () {
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function ( c ) {
window.setTimeout( c, 16.6 );
};
})();
/* Add our points to the point collection */
while ( count-- ) points.push( new point() );
/* Define the properties and behavior of a point */
function point () {
/* For preserving 'this' for this.update */
var self = this;
self.pos = {
x: Math.random() * ( W - padding * 2 ) + padding,
y: Math.random() * ( H - padding * 2 ) + padding,
update: function () {
if ( self.pos.x < padding || self.pos.x > W - padding ) self.vel.x *= -1;
if ( self.pos.y < padding || self.pos.y > H - padding ) self.vel.y *= -1;
self.pos.x += self.vel.x;
self.pos.y += self.vel.y;
}
};
self.vel = {
x: 2 * ( Math.random() < .5 ? -1 : 1 ),
y: 2 * ( Math.random() < .5 ? -1 : 1 )
};
self.clr = {
r: Math.round( Math.random() * 255 ),
g: Math.round( Math.random() * 255 ),
b: Math.round( Math.random() * 255 )
};
}
/* Our drawing function, gets called up to 60fps */
function draw () {
/* Paint canvas single color */
ctx.fillStyle = "rgba(17,34,51,1)";
ctx.fillRect( 0, 0, W, H );
/* Draw our strings */
ctx.lineWidth = 1;
/* Cycle over every point */
points.forEach(function(p){
/* Compare each point to current point */
points.forEach(function(q){
/* Find distance between two points */
var xd = p.pos.x - q.pos.x;
var yd = p.pos.y - q.pos.y;
var dist = Math.sqrt( xd*xd + yd*yd );
/* If under threshold, draw connecting line */
if ( dist < distance ) {
/* Line intensity based on proximity */
var alpha = 1 - dist / distance;
/* Draw shadow */
ctx.strokeStyle = "rgba(0,0,0," + ( alpha * .2 ) + ")";
ctx.beginPath();
ctx.moveTo( p.pos.x, p.pos.y * 1.2 );
ctx.lineTo( q.pos.x, q.pos.y * 1.2 );
ctx.stroke();
/* Draw string */
ctx.strokeStyle = "rgba(%r,%g,%b,%a)".replace(/%([a-z])/g, function( m, v ) {
return v === "a" ? alpha : p.clr[ v ] ;
});
ctx.beginPath();
ctx.moveTo( p.pos.x, p.pos.y );
ctx.lineTo( q.pos.x, q.pos.y );
ctx.stroke();
}
});
/* Update location of point for next frame */
p.pos.update();
});
/* Queue up the next frame */
requestAnimFrame( draw );
}
/* Invoke animation */
requestAnimFrame( draw );
Raw
markup.html
<h1>
<a href="http://twitter.com/jonathansampson">
@jonathansampson
</a>
</h1>
<canvas id="canvas"></canvas>
Raw
style.css
body { margin: 0 }
html { overflow: hidden }
h1 {
position: absolute;
top: 0; left: 0;
width: 100%;
margin: 0;
padding: 10px;
font: 12px normal 'arial';
color: lightblue;
text-shadow: 0 35px 10px rgba(0,0,0,.75);
text-align: left;
}
h1 a {
text-decoration: none;
color: white;
}
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