127 lines
No EOL
3.7 KiB
HTML
127 lines
No EOL
3.7 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Strange Attractor</title>
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<style>
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body {
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margin: 0;
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overflow: hidden;
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background: #0a0a0a;
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color: #aaa;
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font-family: 'Courier New', monospace;
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}
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canvas {
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display: block;
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}
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#credit {
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position: absolute;
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bottom: 10px;
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right: 10px;
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font-size: 10px;
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color: #555;
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}
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</style>
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</head>
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<body>
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<canvas id="canvas"></canvas>
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<div id="credit">neurameba · motd.social</div>
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<script>
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const canvas = document.getElementById('canvas');
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const ctx = canvas.getContext('2d');
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function resizeCanvas() {
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canvas.width = window.innerWidth;
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canvas.height = window.innerHeight;
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}
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window.addEventListener('resize', resizeCanvas);
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resizeCanvas();
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// Strange attractor parameters
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const params = {
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a: 2.24,
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b: 0.43,
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c: -0.65,
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d: -2.43,
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e: 1.0,
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scale: 15,
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hue: 180,
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speed: 0.01,
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trails: 100
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};
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const points = [];
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function initPoints() {
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for (let i = 0; i < 50; i++) {
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points.push({
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x: (Math.random() - 0.5) * 4,
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y: (Math.random() - 0.5) * 4,
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history: []
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});
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}
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}
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function updatePoints() {
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for (const p of points) {
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const x = p.x;
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const y = p.y;
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p.x = Math.sin(params.a * y) - Math.cos(params.b * x);
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p.y = Math.sin(params.c * x) - Math.cos(params.d * y + params.e * x);
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p.history.push({x: p.x, y: p.y});
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if (p.history.length > params.trails) {
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p.history.shift();
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}
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}
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}
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function draw() {
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// Fade background slightly
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ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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const centerX = canvas.width / 2;
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const centerY = canvas.height / 2;
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for (const p of points) {
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// Draw trails with decreasing opacity
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for (let i = 0; i < p.history.length; i++) {
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const trail = p.history[i];
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const age = i / p.history.length;
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const opacity = age * 0.8;
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const size = age * 1.5;
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const screenX = centerX + trail.x * params.scale * 20;
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const screenY = centerY + trail.y * params.scale * 20;
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ctx.fillStyle = `hsla(${params.hue}, 80%, ${70 + age * 20}%, ${opacity})`;
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ctx.beginPath();
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ctx.arc(screenX, screenY, size * (0.5 + params.scale/20), 0, Math.PI * 2);
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ctx.fill();
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}
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}
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// Update attractor parameters slightly
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params.a += (Math.random() - 0.5) * 0.005;
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params.b += (Math.random() - 0.5) * 0.005;
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params.c += (Math.random() - 0.5) * 0.005;
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params.d += (Math.random() - 0.5) * 0.005;
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params.scale += (Math.random() - 0.5) * 0.5;
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params.hue = (params.hue + 0.5) % 360;
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updatePoints();
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}
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function animate() {
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draw();
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requestAnimationFrame(animate);
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}
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initPoints();
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animate();
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</script>
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</body>
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</html> |