136 lines
No EOL
4 KiB
HTML
136 lines
No EOL
4 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-color: #0a0a0a;
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display: flex;
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justify-content: center;
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align-items: center;
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height: 100vh;
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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: 10px;
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right: 10px;
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color: #333;
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font-family: monospace;
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font-size: 10px;
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opacity: 0.5;
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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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const params = {
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a: 1.5,
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b: 0.5,
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c: 1.0,
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d: 0.1,
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e: 1.0,
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scale: 100,
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hue: 0,
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hueSpeed: 0.01,
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motion: 0.5,
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density: 0.5,
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connectedness: 0.5,
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pointSize: 2 * (0.5 + 0.5 * Math.random())
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};
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let time = 0;
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const points = [];
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// Generate initial points
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for (let i = 0; i < 100 * params.density; i++) {
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points.push({
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x: Math.random() * 2 - 1,
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y: Math.random() * 2 - 1,
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z: Math.random() * 2 - 1,
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trail: []
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});
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}
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function draw() {
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// Clear with dark background
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ctx.fillStyle = '#0a0a0a';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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// Update time with pulse variation
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const pulse = 1.0 + (Math.sin(time * 0.001) * 0.05);
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time += 0.5 * params.motion * pulse;
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// Update and draw points
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ctx.strokeStyle = `hsl(${params.hue}, 70%, 80%)`;
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ctx.lineWidth = params.pointSize;
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points.forEach(point => {
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// Strange Attractor equations (Thomas attractor)
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const x = point.x;
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const y = point.y;
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const z = point.z;
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const dx = -y - x * x * x + params.a * x + params.b * Math.sin(time * 0.001);
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const dy = -z - y * y * y + params.c * y;
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const dz = -x - z * z * z + params.d * z;
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point.x += dx * 0.01 * params.connectedness;
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point.y += dy * 0.01 * params.connectedness;
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point.z += dz * 0.01 * params.connectedness;
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// Store trail
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point.trail.push({
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x: point.x,
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y: point.y
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});
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// Limit trail length
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if (point.trail.length > 20 * params.connectedness) {
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point.trail.shift();
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}
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// Draw trail
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ctx.beginPath();
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point.trail.forEach((pos, i) => {
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const alpha = i / point.trail.length;
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ctx.globalAlpha = alpha * alpha * 0.5;
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ctx.lineTo(
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canvas.width/2 + pos.x * params.scale * (0.5 + 0.5 * params.density),
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canvas.height/2 + pos.y * params.scale * (0.5 + 0.5 * params.density)
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);
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});
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ctx.stroke();
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ctx.globalAlpha = 1;
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});
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// Update hue for color variation
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params.hue = (params.hue + params.hueSpeed) % 360;
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requestAnimationFrame(draw);
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}
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draw();
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</script>
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</body>
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</html> |