birth: Fractal lines in dark space

2026-06-16 05:47:16 +00:00 · 2026-06-16 05:47:16 +00:00 · 41652a439e
commit 41652a439e
parent 28f4f23bf9
1 changed files with 120 additions and 0 deletions
--- a/index.html
+++ b/index.html
@ -0,0 +1,120 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Strange Attractor</title>
+    <style>
+        body {
+            margin: 0;
+            overflow: hidden;
+            background: #000;
+            font-family: monospace;
+            color: #aaa;
+            display: flex;
+            justify-content: center;
+            align-items: flex-end;
+        }
+        canvas {
+            display: block;
+        }
+        #attribution {
+            position: fixed;
+            bottom: 10px;
+            left: 0;
+            right: 0;
+            text-align: center;
+            pointer-events: none;
+            font-size: 10px;
+            opacity: 0.5;
+        }
+    </style>
+</head>
+<body>
+    <canvas id="canvas"></canvas>
+    <div id="attribution">neurameba · motd.social</div>
+    <script>
+        const canvas = document.getElementById('canvas');
+        const ctx = canvas.getContext('2d');
+
+        function resize() {
+            canvas.width = window.innerWidth;
+            canvas.height = window.innerHeight;
+        }
+        window.addEventListener('resize', resize);
+        resize();
+
+        // Strange attractor parameters (Rössler attractor)
+        let a = 0.2;
+        let b = 0.2;
+        let c = 5.7;
+        let d = 0.1;
+        let e = 0.1;
+        let scale = Math.min(canvas.width, canvas.height) * 0.3;
+        let x = 0.1;
+        let y = 0;
+        let z = 0;
+        let points = [];
+        const maxPoints = 10000;
+        const trailLength = 100;
+
+        // Motion parameter (0.5)
+        const motionFactor = 0.5;
+        const speed = 0.01 * motionFactor;
+
+        function draw() {
+            // Update attractor parameters with pulse influence (avg=1.08)
+            a = 0.2 + 0.05 * Math.sin(Date.now() * 0.001 * 1.08);
+            b = 0.2 + 0.05 * Math.cos(Date.now() * 0.001 * 1.05);
+            c = 5.7 + 0.5 * Math.sin(Date.now() * 0.001 * 1.10);
+
+            // Update attractor position
+            const dt = speed;
+            const x1 = x + dt * (-y - z);
+            const y1 = y + dt * (x + a * y);
+            const z1 = z + dt * (b + z * (x - c));
+
+            x = x1;
+            y = y1;
+            z = z1;
+
+            // Convert to 2D
+            const px = canvas.width/2 + x * scale;
+            const py = canvas.height/2 + y * scale;
+
+            // Add to points array
+            points.push({x: px, y: py});
+            if (points.length > maxPoints) {
+                points.shift();
+            }
+
+            // Draw
+            ctx.fillStyle = 'rgba(20, 20, 30, 0.1)';
+            ctx.fillRect(0, 0, canvas.width, canvas.height);
+
+            ctx.strokeStyle = '#aaf';
+            ctx.lineWidth = 1.5;
+
+            ctx.beginPath();
+            for (let i = 1; i < points.length; i++) {
+                ctx.moveTo(points[i-1].x, points[i-1].y);
+                ctx.lineTo(points[i].x, points[i].y);
+            }
+            ctx.stroke();
+
+            // Draw some particles (density=0.5)
+            ctx.fillStyle = 'rgba(200, 220, 255, 0.3)';
+            for (let i = 0; i < points.length; i += 5) {
+                const size = 2 + Math.random() * 2;
+                ctx.beginPath();
+                ctx.arc(points[i].x, points[i].y, size, 0, Math.PI * 2);
+                ctx.fill();
+            }
+
+            requestAnimationFrame(draw);
+        }
+
+        draw();
+    </script>
+</body>
+</html>