133 lines
No EOL
4.1 KiB
HTML
133 lines
No EOL
4.1 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>Neurameba 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-color: #0a0a0a;
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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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#attribution {
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position: fixed;
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bottom: 20px;
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left: 20px;
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color: #444;
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font-size: 10px;
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pointer-events: none;
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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="attribution">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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let points = [];
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let time = 0;
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const pulse = { avg: 1.12, min: 0.90, max: 1.30 };
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function initAttractor() {
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points = [];
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for (let i = 0; i < 100; i++) {
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points.push({
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x: Math.random() * canvas.width,
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y: Math.random() * canvas.height,
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vx: 0,
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vy: 0
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});
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}
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}
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function updateAttractor() {
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const attractor = {
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a: 1.4 + 0.5 * (Math.sin(time * 0.05) * pulse.min + Math.cos(time * 0.03) * pulse.max),
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b: 2.0 + 0.5 * (Math.sin(time * 0.07) * pulse.max + Math.cos(time * 0.04) * pulse.min),
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c: 0.9 - 0.2 * (Math.sin(time * 0.06) * pulse.avg),
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d: 2.0 + 0.5 * (Math.cos(time * 0.08) * pulse.max)
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};
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points.forEach(p => {
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const x = p.x - canvas.width / 2;
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const y = p.y - canvas.height / 2;
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const newX = Math.sin(attractor.a * y) - Math.cos(attractor.b * x);
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const newY = Math.sin(attractor.c * x) - Math.cos(attractor.d * y);
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p.vx += newX * 0.1 * (0.5 + 0.5 * pulse.avg);
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p.vy += newY * 0.1 * (0.5 + 0.5 * pulse.avg);
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p.vx *= 0.95;
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p.vy *= 0.95;
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p.x += p.vx;
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p.y += p.vy;
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p.x = (p.x + canvas.width) % canvas.width;
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p.y = (p.y + canvas.height) % canvas.height;
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});
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time += 0.01;
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}
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function drawAttractor() {
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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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// Fade trails
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ctx.globalCompositeOperation = 'destination-out';
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ctx.fillStyle = 'rgba(0, 0, 0, 0.15)';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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ctx.globalCompositeOperation = 'source-over';
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// Draw points
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points.forEach(p => {
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const hue = (180 + Math.sin(time * 0.1) * 30) % 360;
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const saturation = 80 + Math.sin(time * 0.2) * 20;
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const lightness = 60 + Math.cos(time * 0.15) * 10;
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const alpha = 0.7 + Math.sin(time * 0.08) * 0.3;
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ctx.fillStyle = `hsla(${hue}, ${saturation}%, ${lightness}%, ${alpha})`;
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ctx.beginPath();
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ctx.arc(p.x, p.y, 1.5 + 0.5 * Math.sin(time * 0.3), 0, Math.PI * 2);
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ctx.fill();
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});
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}
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function animate() {
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updateAttractor();
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drawAttractor();
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requestAnimationFrame(animate);
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}
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initAttractor();
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animate();
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// Handle window focus/blur for performance
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document.addEventListener('visibilitychange', () => {
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if (document.hidden) {
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points.forEach(p => {
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p.vx *= 0.9;
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p.vy *= 0.9;
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});
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}
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});
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</script>
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</body>
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</html> |