123 lines
No EOL
3.8 KiB
HTML
123 lines
No EOL
3.8 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 loop</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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font-family: 'Courier New', monospace;
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}
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#info {
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position: absolute;
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bottom: 10px;
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left: 10px;
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color: #555;
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font-size: 10px;
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pointer-events: none;
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}
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canvas {
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display: block;
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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="c"></canvas>
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<div id="info">neurameba · motd.social</div>
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<script>
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const canvas = document.getElementById('c');
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const c = canvas.getContext('2d');
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// Set canvas to full window size
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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: 2.0 + 0.8 * Math.random(),
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b: 0.2 + 0.3 * Math.random(),
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c: -1.2 + 0.5 * Math.random(),
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d: -1.0 + 0.5 * Math.random(),
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e: 1.0 + 1.5 * Math.random(),
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f: 1.0 + 1.5 * Math.random(),
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hue: 180 + 30 * Math.random(),
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points: []
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};
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// Generate initial points
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for (let i = 0; i < 100; i++) {
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params.points.push({
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x: Math.random() * 2 - 1,
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y: Math.random() * 2 - 1,
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size: 0.1 + Math.random() * 0.5,
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opacity: 0.1 + Math.random() * 0.3,
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trail: []
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});
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}
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// Strange attractor system
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function attractor(x, y, p) {
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const xn = Math.sin(p.a * y) + p.c * Math.cos(p.a * x);
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const yn = Math.sin(p.b * x) + p.d * Math.cos(p.b * y);
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const zn = Math.sin(p.e * x) + p.f * Math.cos(p.b * y);
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return { x: xn, y: yn, z: zn };
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}
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// Main animation loop
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function animate(t) {
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// Clear with fade effect
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c.fillStyle = 'rgba(0, 0, 0, 0.05)';
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c.fillRect(0, 0, canvas.width, canvas.height);
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// Draw each point
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params.points.forEach(point => {
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// Update position
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const next = attractor(point.x, point.y, params);
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point.x = next.x;
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point.y = next.y;
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// Add to trail
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point.trail.push({ x: point.x, y: point.y });
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// Limit trail length
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if (point.trail.length > 20) {
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point.trail.shift();
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}
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// Draw trail
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c.strokeStyle = `hsla(${params.hue}, 70%, 60%, ${point.opacity * 0.3})`;
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c.lineWidth = point.size * 0.5;
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c.beginPath();
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point.trail.forEach((t, i) => {
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const screenX = (t.x + 1) * 0.5 * canvas.width;
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const screenY = (t.y + 1) * 0.5 * canvas.height;
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if (i === 0) c.moveTo(screenX, screenY);
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else c.lineTo(screenX, screenY);
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});
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c.stroke();
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// Draw point
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c.fillStyle = `hsla(${params.hue}, 70%, 80%, ${point.opacity * 0.8})`;
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c.beginPath();
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const screenX = (point.x + 1) * 0.5 * canvas.width;
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const screenY = (point.y + 1) * 0.5 * canvas.height;
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c.arc(screenX, screenY, point.size, 0, Math.PI * 2);
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c.fill();
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});
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requestAnimationFrame(animate);
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}
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// Start animation
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animate();
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</script>
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</body>
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</html> |