clp/hilbert-clock
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first commit. The hands pulse back and forth.

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Christian Lawson-Perfect 2025-03-17 09:16:00 +00:00
commit 6ddcc2f893
4 changed files with 119 additions and 0 deletions
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.make.lock Normal file
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index.html Normal file
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>A thing made by CLP</title>
<script type="module" src="script.js"></script>
<link rel="stylesheet" href="style.css">
</head>
<body>
<main>
<svg id="board" viewBox="-0.3 -0.3 1.6 1.6">
<defs>
<linearGradient id="dots-gradient">
<stop offset="0%" stop-color="green" />
<stop offset="100%" stop-color="white" />
</linearGradient>
</defs>
<rect x="-100" y="-100" width="200" height="200" fill="hsl(120,30%,50%)"/>
<path id="dots" fill="none" stroke="hsl(240,20%,80%)" stroke-width="0.01" stroke-linejoin="round" stroke-linecap="round"/>
<path class="curve" fill="none" stroke="hsl(24,50%,10%)" stroke-width="0.01" stroke-linejoin="round" stroke-linecap="square"/>
<path class="curve" fill="none" stroke="hsl(240,50%,50%)" stroke-width="0.01" stroke-linejoin="round" stroke-linecap="square"/>
<text id="debug" fill="white" font-size="0.1"></debug>
</svg>
</main>
</body>
</html>

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script.js Normal file
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let steps = 3;
console.clear();
const rules = {
"A": "+BF-AFA-FB+",
"B": "-AF+BFB+FA-",
};
let s = "A";
for(let i=0;i<steps;i++) {
let ns = "";
for(let c of s) {
ns += rules[c] || c;
}
s = ns;
}
let [x,y] = [0,0];
const m = 1/(2**steps-1);
let dir = [m,0];
let d = 'M 0 0 ';
const width = 1.5 * 2**-(steps+1);
const dots = [];
for(let c of s) {
const [dx,dy] = dir;
switch(c) {
case '+':
dir = [-dy,dx];
break;
case '-':
dir = [dy,-dx];
break;
case 'F':
x += dx;
y += dy;
d += `l ${dx} ${dy}`;
}
}
d += 'l 0.000000001 0.000001'; // make sure the final dot is drawn
const length = (2**(2*steps)-1) * m;
const curves = Array.from(document.querySelectorAll('.curve'));
for(let curve of curves) {
curve.setAttribute('stroke-width',width);
curve.setAttribute('stroke-linecap','round');
curve.setAttribute('stroke-dasharray',`${length} ${length}`);
curve.setAttribute('d',d);
}
document.getElementById('dots').setAttribute('stroke-width',width*0.4);
document.getElementById('dots').setAttribute('d',d);
document.getElementById('dots').setAttribute('stroke-dasharray',`0 ${m}`);
function easeInOutSine(x) {
return -(Math.cos(Math.PI * x) - 1) / 2;
}
function easeLinear(t) {
return 1-2*Math.abs(t % 1 - 0.5);
}
function frame() {
const period = 1000;
const pips = 2**(2*steps)-1;
let scale = 1;
curves.forEach((curve,i) => {
const dt = (new Date() - 0) / scale / period;
const m = dt % (pips);
const t = dt;
const l = (Math.floor(m) + easeInOutSine(m % 1))*length/pips;
const n = Math.max(0,easeInOutSine(t))*l;
//document.getElementById('debug').textContent = `${m.toFixed(4)} ${length} ${pips}`
curve.setAttribute('stroke-dasharray',`${l-n} ${length}`);
curve.setAttribute('stroke-dashoffset',-n);
curve.setAttribute('stroke-width',width*(easeInOutSine(t)*0.1+0.9)/2**(i+1));
scale *= pips;
})
requestAnimationFrame(frame);
}
frame();

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style.css Normal file
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:root {
--spacing: 1em;
color-scheme: light dark;
}