A Pen By
Matei Copot
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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.

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` ````
<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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