birth: Gray Nebula in Motion

2026-06-27 21:47:19 +00:00 · 2026-06-27 21:47:19 +00:00 · 23293909ed
commit 23293909ed
parent 67c83eb033
1 changed files with 149 additions and 0 deletions
--- a/index.html
+++ b/index.html
@ -0,0 +1,149 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Gray Nebula</title>
+    <style>
+        body {
+            margin: 0;
+            overflow: hidden;
+            background: #000;
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            height: 100vh;
+            font-family: Arial, sans-serif;
+        }
+        canvas {
+            display: block;
+        }
+        #attribution {
+            position: fixed;
+            bottom: 10px;
+            left: 50%;
+            transform: translateX(-50%);
+            color: #555;
+            font-size: 12px;
+            pointer-events: none;
+        }
+    </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 resizeCanvas() {
+            canvas.width = window.innerWidth;
+            canvas.height = window.innerHeight;
+        }
+        window.addEventListener('resize', resizeCanvas);
+        resizeCanvas();
+
+        // Parameters derived from abstract specifications
+        const params = {
+            motion: 0.5,
+            density: 0.5,
+            complexity: 0.5,
+            connectedness: 0.5,
+            lifespan: 0.5,
+            pulse: { avg: 1.08, min: 1.05, max: 1.10 },
+            tone: { anger: 0, sadness: 0, curiosity: 0.2, dryness: 0.8, playfulness: 0, tension: 0 }
+        };
+
+        // Reaction-diffusion simulation constants
+        const W = canvas.width;
+        const H = canvas.height;
+        const SIZE = 2; // size of each cell
+        const WIDTH = Math.floor(W / SIZE);
+        const HEIGHT = Math.floor(H / SIZE);
+
+        // Initialize fields
+        let current = new Float32Array(WIDTH * HEIGHT * 4);
+        let next = new Float32Array(WIDTH * HEIGHT * 4);
+
+        // Fill with random values
+        for (let i = 0; i < current.length; i += 4) {
+            current[i] = 0.5 + (Math.random() * 0.1 - 0.05); // A
+            current[i+1] = 0.5 + (Math.random() * 0.1 - 0.05); // B
+            current[i+2] = 0; // C
+            current[i+3] = 0; // D
+        }
+
+        // Simulation parameters
+        const Da = 1.0;
+        const Db = 0.5;
+        const f = 0.055 + (params.complexity * 0.045); // feed rate
+        const k = 0.062 + (params.connectedness * 0.038); // kill rate
+        const feedRate = () => f + (Math.sin(Date.now() * 0.001) * 0.01 * params.pulse.avg);
+
+        function update() {
+            const t = Date.now() * 0.001 * params.motion;
+
+            for (let x = 1; x < WIDTH - 1; x++) {
+                for (let y = 1; y < HEIGHT - 1; y++) {
+                    const i = (x + y * WIDTH) * 4;
+
+                    // Get neighbors
+                    const iN = ((x) + (y-1) * WIDTH) * 4;
+                    const iS = ((x) + (y+1) * WIDTH) * 4;
+                    const iE = ((x+1) + (y) * WIDTH) * 4;
+                    const iW = ((x-1) + (y) * WIDTH) * 4;
+                    const iNW = ((x-1) + (y-1) * WIDTH) * 4;
+                    const iNE = ((x+1) + (y-1) * WIDTH) * 4;
+                    const iSW = ((x-1) + (y+1) * WIDTH) * 4;
+                    const iSE = ((x+1) + (y+1) * WIDTH) * 4;
+
+                    const A = current[i];
+                    const B = current[i+1];
+
+                    // Laplacian
+                    const lapA = (current[iN] + current[iS] + current[iE] + current[iW] +
+                                 current[iNW] + current[iNE] + current[iSW] + current[iSE] - 8 * A) / 8;
+                    const lapB = (current[iN+1] + current[iS+1] + current[iE+1] + current[iW+1] +
+                                 current[iNW+1] + current[iNE+1] + current[iSW+1] + current[iSE+1] - 8 * B) / 8;
+
+                    // Reaction terms
+                    const reactA = A * B * B;
+                    const reactB = A * B;
+
+                    // Update
+                    next[i] = A + (Da * lapA - reactA + feedRate()) * SIZE;
+                    next[i+1] = B + (Db * lapB + reactA - reactB) * SIZE;
+                    next[i+2] = 0;
+                    next[i+3] = 0;
+                }
+            }
+
+            // Swap buffers
+            [current, next] = [next, current];
+
+            // Render
+            ctx.clearRect(0, 0, W, H);
+            for (let x = 0; x < WIDTH; x++) {
+                for (let y = 0; y < HEIGHT; y++) {
+                    const i = (x + y * WIDTH) * 4;
+                    const val = current[i+1]; // B value
+
+                    if (val > 0.1 && val < 0.9) {
+                        const size = SIZE * 2 * (1 - params.tone.dryness);
+                        const hue = 200 + (val * 120);
+                        const sat = 50 + (params.tone.curiosity * 50);
+                        const bri = 10 + (val * 80);
+
+                        ctx.fillStyle = `hsl(${hue}, ${sat}%, ${bri}%)`;
+                        ctx.fillRect(x * SIZE, y * SIZE, size, size);
+                    }
+                }
+            }
+
+            requestAnimationFrame(update);
+        }
+
+        update();
+    </script>
+</body>
+</html>