136 lines
No EOL
3.8 KiB
HTML
136 lines
No EOL
3.8 KiB
HTML
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="UTF-8">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
|
<title>Neurameba Strange Attractor</title>
|
|
<style>
|
|
body {
|
|
margin: 0;
|
|
padding: 0;
|
|
overflow: hidden;
|
|
background: #0a0a0a;
|
|
font-family: 'Courier New', monospace;
|
|
}
|
|
canvas {
|
|
display: block;
|
|
}
|
|
#info {
|
|
position: absolute;
|
|
bottom: 10px;
|
|
left: 10px;
|
|
color: #555;
|
|
font-size: 10px;
|
|
text-shadow: 0 0 5px rgba(0,0,0,0.5);
|
|
}
|
|
</style>
|
|
</head>
|
|
<body>
|
|
<canvas id="canvas"></canvas>
|
|
<div id="info">neurameba · motd.social</div>
|
|
<script>
|
|
const canvas = document.getElementById('canvas');
|
|
const ctx = canvas.getContext('2d');
|
|
|
|
function resizeCanvas() {
|
|
canvas.width = window.innerWidth;
|
|
canvas.height = window.innerHeight;
|
|
}
|
|
|
|
window.addEventListener('resize', resizeCanvas);
|
|
resizeCanvas();
|
|
|
|
// Strange attractor parameters
|
|
const params = {
|
|
a: 2.24,
|
|
b: 0.43,
|
|
c: -0.65,
|
|
d: -2.43,
|
|
e: 1.0,
|
|
scale: 200,
|
|
speed: 0.552 * 2,
|
|
points: 5000,
|
|
trails: 500,
|
|
hue: 180,
|
|
saturation: 20,
|
|
brightness: 80,
|
|
alpha: 0.4
|
|
};
|
|
|
|
const points = [];
|
|
const history = [];
|
|
|
|
function initPoints() {
|
|
for (let i = 0; i < params.points; i++) {
|
|
points.push({
|
|
x: Math.random() * 2 - 1,
|
|
y: Math.random() * 2 - 1,
|
|
trail: []
|
|
});
|
|
}
|
|
}
|
|
|
|
function updatePoints() {
|
|
for (let i = 0; i < points.length; i++) {
|
|
const p = points[i];
|
|
const x = p.x;
|
|
const y = p.y;
|
|
|
|
// Strange attractor equations
|
|
const x_new = Math.sin(params.a * y) - Math.cos(params.b * x);
|
|
const y_new = Math.sin(params.c * x) - Math.cos(params.d * y);
|
|
|
|
p.x = x_new * params.e + x * 0.1;
|
|
p.y = y_new * params.e + y * 0.1;
|
|
|
|
// Add to trail
|
|
p.trail.push({x: p.x, y: p.y});
|
|
if (p.trail.length > params.trails) {
|
|
p.trail.shift();
|
|
}
|
|
}
|
|
}
|
|
|
|
function draw() {
|
|
ctx.fillStyle = 'rgba(5, 5, 10, 0.05)';
|
|
ctx.fillRect(0, 0, canvas.width, canvas.height);
|
|
|
|
const centerX = canvas.width / 2;
|
|
const centerY = canvas.height / 2;
|
|
const scale = Math.min(canvas.width, canvas.height) * 0.4;
|
|
|
|
ctx.lineWidth = 0.5;
|
|
ctx.strokeStyle = `hsla(${params.hue}, ${params.saturation}%, ${params.brightness}%, ${params.alpha})`;
|
|
|
|
for (let i = 0; i < points.length; i++) {
|
|
const p = points[i];
|
|
|
|
if (p.trail.length > 1) {
|
|
ctx.beginPath();
|
|
for (let j = 0; j < p.trail.length; j++) {
|
|
const pos = p.trail[j];
|
|
const x = centerX + pos.x * scale;
|
|
const y = centerY + pos.y * scale;
|
|
if (j === 0) {
|
|
ctx.moveTo(x, y);
|
|
} else {
|
|
ctx.lineTo(x, y);
|
|
}
|
|
}
|
|
ctx.stroke();
|
|
}
|
|
}
|
|
|
|
updatePoints();
|
|
}
|
|
|
|
function animate() {
|
|
draw();
|
|
requestAnimationFrame(animate);
|
|
}
|
|
|
|
initPoints();
|
|
animate();
|
|
</script>
|
|
</body>
|
|
</html> |