A Pen By
Tiffany Rayside
Pro

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 = 'canv'></canvas>
```

` ````
body{
width:100%;
margin:0;
overflow:hidden;
background:#000815;
}
canvas{
display:block;
}
```

` ````
var c = document.getElementById('canv'),
$ = c.getContext("2d");
c.width = window.innerWidth;
c.height = window.innerHeight;
window.addEventListener('resize',function(){
c.width = window.innerWidth;
c.height = window.innerHeight;
},false);
function möb(a, b, c) {
var pa = a[0] * a[0] + a[1] * a[1],
pb = b[0] * b[0] + b[1] * b[1],
pc = c[0] * c[0] + c[1] * c[1];
var y = (
(a[0] - b[0]) * (pb - pc) - (b[0] - c[0]) * (pa - pb)
) / (
2 * (b[1] - a[1]) * (b[0] - c[0]) - 2 * (a[0] - b[0]) * (c[1] - b[1])
),
x = (pa - pb + 2 * (b[1] - a[1]) * y) / (2 * (a[0] - b[0])),
r = Math.sqrt((x - a[0]) * (x - a[0]) + (y - a[1]) * (y - a[1]));
return [x, y, r];
}
function arcs(x, y, r) {
var c = möb_arc(x, y, r);
if (c[2] > 10) return;
$.beginPath();
$.arc(c[0], c[1], c[2]/1.65, 0, Math.PI*2, false);
$.fill();
$.closePath();
}
function möb_pt(x, y) {
var denom = (x + 1) * (x + 1) + y * y;
return [(x * x - 1 + y * y) / denom, 2 * y / denom];
}
function möb_arc(x, y, r) {
var a = möb_pt(x - r, y),
b = möb_pt(x + r, y),
c = möb_pt(x, y + r);
return möb(a, b, c);
}
function cmul(w, z) {
return [
w[0] * z[0] - w[1] * z[1],
w[0] * z[1] + w[1] * z[0]
];
}
function rotate(z, theta) {
return cmul(z, [Math.cos(theta), Math.sin(theta)]);
}
function modulus(p) {
return Math.sqrt(p[0] * p[0] + p[1] * p[1]);
}
function crecip(z) {
var d = z[0] * z[0] + z[1] * z[1];
return [z[0] / d, -z[1] / d];
}
function spiral(r, st, delta, opts) {
var rd = crecip(delta),
md = modulus(delta),
mrd = 1 / md,
colidx = opts.i,
cols = opts.fill,
min_d = opts.min_d,
max_d = opts.max_d;
for (var q = st, mod_q = modulus(q); mod_q < max_d; q = cmul(q, delta), mod_q *= md) {
$.fillStyle = cols[colidx];
arcs(q[0], q[1], mod_q * r);
colidx = (colidx + 1) % cols.length;
}
colidx = ((opts ? opts.i : 0) + cols.length - 1) % cols.length;
for (var q = cmul(st, rd), mod_q = modulus(q); mod_q > min_d; q = cmul(q, rd), mod_q *= mrd) {
$.fillStyle = cols[colidx];
arcs(q[0], q[1], mod_q * r);
colidx = (colidx + cols.length - 1) % cols.length;
}
}
var p = 9,
q = 36;
var root = doyle(p, q);
var rep = 20000;
function anim(t) {
$.setTransform(1, 0, 0, 1, 0, 0);
$.clearRect(0, 0, c.width, c.height);
$.translate(Math.round(c.width / 2), Math.round(c.height / 2));
$.scale(250, 250);
var beg = rotate(root.a, Math.PI * 2 * t);
for (var i = 0; i < q; i++) {
spiral(root.r, beg, root.a, {
fill: ["#EB1E23", "#D9DFD1", "#008F86"],
i: (i) % 3.5,
min_d: 1e-3,
max_d: 1e3
});
beg = cmul(beg, root.b);
}
}
var fst;
function run(ts) {
if (!fst) fst = ts;
anim(((ts - fst) % rep) / rep);
window.requestAnimationFrame(run);
}
run();
console.log('With ❤ Always, @tmrDevelops');
```

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