146 lines
No EOL
4.3 KiB
HTML
146 lines
No EOL
4.3 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: monospace;
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font-size: 10px;
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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: absolute;
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bottom: 10px;
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left: 10px;
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font-family: monospace;
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font-size: 10px;
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color: #555;
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text-shadow: 0 0 2px rgba(0,0,0,0.5);
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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, false);
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resizeCanvas();
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// Strange attractor parameters (Lorenz system variant)
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const params = {
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a: 10,
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b: 28,
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c: 8/3,
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dt: 0.01,
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scale: 5,
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alpha: 0.5,
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hue: 180,
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maxPoints: 50000
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};
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// State variables
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let points = [];
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let time = 0;
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let frameCount = 0;
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function lorenz(x, y, z) {
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const dx = params.a * (y - x);
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const dy = x * (params.b - z) - y;
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const dz = x * y - params.c * z;
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return { x: x + params.dt * dx, y: y + params.dt * dy, z: z + params.dt * dz };
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}
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function updateAttractor() {
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if (points.length > params.maxPoints) {
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points.shift();
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}
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let x = Math.sin(time * 0.3) * 10;
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let y = Math.cos(time * 0.2) * 10;
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let z = time * 0.1;
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for (let i = 0; i < 5; i++) {
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const next = lorenz(x, y, z);
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x = next.x;
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y = next.y;
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z = next.z;
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// Add some controlled randomization based on motion parameter
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x += (Math.random() * 2 - 1) * params.motion * 0.2;
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y += (Math.random() * 2 - 1) * params.motion * 0.2;
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z += (Math.random() * 2 - 1) * params.motion * 0.2;
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const scale = params.scale * (0.8 + 0.4 * params.density);
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const px = canvas.width/2 + x * scale;
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const py = canvas.height/2 + y * scale;
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const pz = z * 0.2;
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points.push({
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x: px,
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y: py,
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z: pz,
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size: 1 + params.density * 0.5,
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opacity: 0.1 + params.alpha * 0.9
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});
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}
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time += params.dt;
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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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const gradient = ctx.createLinearGradient(0, 0, canvas.width, canvas.height);
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gradient.addColorStop(0, `hsla(${params.hue}, 50%, 30%, ${params.alpha})`);
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gradient.addColorStop(1, `hsla(${params.hue + 20}, 50%, 80%, ${params.alpha * 0.7})`);
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ctx.strokeStyle = gradient;
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ctx.lineWidth = 0.5 + params.complexity * 0.5;
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ctx.beginPath();
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for (let i = 1; i < points.length; i++) {
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const p1 = points[i-1];
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const p2 = points[i];
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const alpha = p1.opacity * Math.min(1, 1000 / points.length);
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ctx.strokeStyle = `hsla(${params.hue}, 50%, ${60 + p1.z * 10}%, ${alpha})`;
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ctx.moveTo(p1.x, p1.y);
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ctx.lineTo(p2.x, p2.y);
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}
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ctx.stroke();
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}
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function animate() {
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updateAttractor();
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drawAttractor();
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frameCount++;
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requestAnimationFrame(animate);
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}
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// Initialize with some randomness
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params.motion = 0.5;
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params.density = 0.5;
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params.complexity = 0.5;
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params.alpha = 0.6;
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animate();
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</script>
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</body>
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</html> |