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birth: Flowing Particles in Emptiness

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motd_admin 2026-06-29 13:47:16 +00:00
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commit 46e5d090a2
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```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Flow Field</title>
<style>
body {
margin: 0;
overflow: hidden;
background: #000;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
font-family: monospace;
}
canvas {
display: block;
}
#attribution {
position: absolute;
bottom: 10px;
color: #fff;
font-size: 10px;
mix-blend-mode: difference;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<div id="attribution">neurameba · motd.social</div>
<script>
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
function resize() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
}
window.addEventListener('resize', resize);
resize();
// Parameters
const motion = 0.5;
const density = 0.5;
const complexity = 0.5;
const connectedness = 0.5;
const lifespan = 0.5;
// Flow field parameters
const particleCount = 200 * density;
const particles = Array(particleCount).fill().map(() => ({
x: Math.random() * canvas.width,
y: Math.random() * canvas.height,
vx: 0,
vy: 0,
size: 2 + Math.random() * 3 * complexity,
life: Math.random() * 100 * lifespan
}));
const timeScale = 0.001 + motion * 0.01;
const colorVariation = dryness * 0.3;
function draw() {
// Clear with semi-transparent to create trails
ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
ctx.fillRect(0, 0, canvas.width, canvas.height);
// Update particles
particles.forEach(p => {
// Flow field based on noise
const nx = p.x / canvas.width * 5;
const ny = p.y / canvas.height * 5;
const angle = Math.sin(nx * 10 + performance.now() * timeScale * 0.1) *
Math.cos(ny * 10 + performance.now() * timeScale * 0.1);
p.vx = Math.cos(angle) * motion * 2;
p.vy = Math.sin(angle) * motion * 2;
p.x += p.vx;
p.y += p.vy;
// Wrap around edges
if (p.x < 0) p.x = canvas.width;
if (p.x > canvas.width) p.x = 0;
if (p.y < 0) p.y = canvas.height;
if (p.y > canvas.height) p.y = 0;
// Trail effect with life
const alpha = Math.min(1, p.life / 100) * (1 - colorVariation);
ctx.fillStyle = `rgba(255, 255, 255, ${alpha})`;
ctx.beginPath();
ctx.arc(p.x, p.y, p.size * (0.5 + Math.random() * 0.5 * complexity), 0, Math.PI * 2);
ctx.fill();
p.life--;
if (p.life <= 0) {
p.x = Math.random() * canvas.width;
p.y = Math.random() * canvas.height;
p.life = 100;
}
});
requestAnimationFrame(draw);
}
draw();
</script>
</body>
</html>
```