JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

Any URL's added here will be added as `<script>`

s in order, and run *before* the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

` ````
<canvas id=c></canvas>
```

` ````
canvas {
position: absolute;
top: 0;
left: 0;
}
```

` ````
var w = c.width = window.innerWidth,
h = c.height = window.innerHeight,
ctx = c.getContext( '2d' ),
opts = {
dist: 15, //units
sideLen: 25, //points
waveIncrement: .02,
distanceWaveFactor: 50,
colorIncrement: 1,
colorMultiplier: 100,
baseY: 60,
addedY: 50,
depth: 400,
maxDepth: 700,
rotYVel: .01,
focalLength: 250,
vanishPoint: {
x: w / 2,
y: h / 2
}
},
calc = {
difX: Math.sqrt( 3 ) * opts.dist, // height of a equilateral triangle
difZ: opts.dist * 3 / 2, // side of a triangle ( because it goes down to a vertex ) then half a side of the triangle in the hex below: s + s/2 = s*3/2
translate: {
x: -Math.sqrt( 3 ) * opts.dist * opts.sideLen / 2,
z: -opts.dist * 3 / 2 * opts.sideLen / 2,
y: opts.baseY
},
rotY: {}
},
rotY = 0,
points = [],
tick = 0,
waveTick = 0,
colorTick = 0;
function setup(){
// put hexagon points in the array
for( var i = 0; i < opts.sideLen; ++i ){
var shiftZ = ( ( i + 1 ) % 2 ) / 2;
for( var j = 0; j < opts.sideLen; ++j ){
var shiftX = ( j % 2 ) / 2;
points.push( new Point(
( j + shiftZ ) * calc.difX + calc.translate.x,
calc.translate.y,
( i + shiftX ) * calc.difZ + calc.translate.z ) );
// connect
if( points[ i * opts.sideLen + j - 1 ] && j > 0 )
points[ points.length - 1 ].link( points[ i * opts.sideLen + j - 1 ] );
if( points[ ( i - 1 ) * opts.sideLen + j ] )
points[ points.length - 1 ].link( points[ ( i - 1 ) * opts.sideLen + j ] );
}
}
}
function Point( x, y, z ){
this.x = x;
this.y = y;
this.z = z;
this.screen = {
x: 0,
y: 0
};
this.distFromCenter = Math.sqrt( x*x + z*z ) / opts.distanceWaveFactor;
this.links = [];
}
Point.prototype.link = function( point ){
this.links.push( point );
}
Point.prototype.step = function(){
var wave = -Math.sin( waveTick + this.distFromCenter ),
x = this.x,
y = this.y + opts.addedY * wave,
z = this.z;
// apply rotation around Y axis
var x1 = x;
x = x * calc.rotY.cos - z * calc.rotY.sin;
z = z * calc.rotY.cos + x1 * calc.rotY.sin;
// push back
z += opts.depth;
if( z < 0 )
return false;
// calculate screen position
var scale = opts.focalLength / z;
this.screen.x = opts.vanishPoint.x + scale * x;
this.screen.y = opts.vanishPoint.y + scale * y;
ctx.strokeStyle = 'hsla( hue, 80%, 50%, alp )'
.replace( 'hue', colorTick + wave * opts.colorMultiplier )
.replace( 'alp', 1 / this.distFromCenter );
ctx.beginPath();
for( var i = 0; i < this.links.length; ++i ){
ctx.moveTo( this.screen.x, this.screen.y );
ctx.lineTo( this.links[ i ].screen.x, this.links[ i ].screen.y );
}
ctx.stroke();
}
function anim(){
window.requestAnimationFrame( anim );
++tick;
colorTick += opts.colorIncrement;
waveTick += opts.waveIncrement;
ctx.fillStyle = 'black';
ctx.fillRect( 0, 0, w, h );
rotY += opts.rotYVel;
calc.rotY.cos = Math.cos( rotY );
calc.rotY.sin = Math.sin( rotY );
points.map( function( point ){ point.step(); } );
}
setup();
anim();
window.addEventListener( 'resize', function(){
w = c.width = window.innerWidth;
h = c.height = window.innerHeight;
opts.vanishPoint.x = w / 2;
opts.vanishPoint.y = h / 2;
})
```

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