birth: Gray Nebula Pulse

2026-05-11 17:47:16 +00:00 · 2026-05-11 17:47:16 +00:00 · c04a59c9aa
commit c04a59c9aa
parent 511787d2c6
1 changed files with 124 additions and 0 deletions
--- a/index.html
+++ b/index.html
@ -0,0 +1,124 @@
+<!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; }
+        canvas { display: block; }
+        #info { position: absolute; bottom: 10px; right: 10px; color: #777; font-family: monospace; font-size: 11px; }
+    </style>
+</head>
+<body>
+    <canvas id="canvas"></canvas>
+    <div id="info">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();
+
+        // Reaction-diffusion parameters (Gray-Scott model)
+        const params = {
+            feed: 0.055,
+            kill: 0.062,
+            diffusionA: 1,
+            diffusionB: 0.5,
+            timeStep: 0.01,
+            scale: 10,
+            colorOffset: 0.2
+        };
+
+        // Grid setup
+        const cols = Math.floor(canvas.width / params.scale);
+        const rows = Math.floor(canvas.height / params.scale);
+        let grid = new Array(cols).fill().map(() => new Array(rows).fill(0));
+        let nextGrid = new Array(cols).fill().map(() => new Array(rows).fill(0));
+
+        function initialize() {
+            // Randomize initial state with density
+            for (let i = 0; i < cols; i++) {
+                for (let j = 0; j < rows; j++) {
+                    grid[i][j] = Math.random() * 0.2;
+                }
+            }
+
+            // Add some central patterns
+            const centerX = Math.floor(cols / 2);
+            const centerY = Math.floor(rows / 2);
+            for (let i = -10; i <= 10; i++) {
+                for (let j = -10; j <= 10; j++) {
+                    if (Math.sqrt(i*i + j*j) < 10) {
+                        grid[centerX + i][centerY + j] = 0.5 + Math.random() * 0.3;
+                    }
+                }
+            }
+        }
+
+        function update() {
+            for (let i = 1; i < cols - 1; i++) {
+                for (let j = 1; j < rows - 1; j++) {
+                    const a = grid[i][j];
+                    const b = grid[i][j] - a;
+
+                    // Reaction-diffusion equations
+                    const laplacianA = (grid[i-1][j] + grid[i+1][j] + grid[i][j-1] + grid[i][j+1] - 4 * a) * params.diffusionA;
+                    const laplacianB = (grid[i-1][j] + grid[i+1][j] + grid[i][j-1] + grid[i][j+1] - 4 * b) * params.diffusionB;
+
+                    nextGrid[i][j] = a + params.timeStep * (
+                        params.feed * (1 - a) * b - params.kill * a + laplacianA
+                    );
+
+                    nextGrid[i][j] += params.timeStep * (
+                        -params.feed * (1 - a) * b + params.kill * a + laplacianB
+                    );
+                }
+            }
+
+            // Swap grids
+            [grid, nextGrid] = [nextGrid, grid];
+
+            // Boundary conditions
+            for (let i = 0; i < cols; i++) {
+                grid[i][0] = grid[i][1];
+                grid[i][rows-1] = grid[i][rows-2];
+            }
+            for (let j = 0; j < rows; j++) {
+                grid[0][j] = grid[1][j];
+                grid[cols-1][j] = grid[cols-2][j];
+            }
+        }
+
+        function draw() {
+            ctx.clearRect(0, 0, canvas.width, canvas.height);
+
+            for (let i = 0; i < cols; i++) {
+                for (let j = 0; j < rows; j++) {
+                    const val = grid[i][j];
+                    if (val > 0) {
+                        const brightness = Math.max(0, Math.min(1, val * 2));
+                        const hue = (180 + val * 10) % 360;
+                        ctx.fillStyle = `hsl(${hue}, 0%, ${100 - brightness * 100}%)`;
+                        ctx.fillRect(i * params.scale, j * params.scale, params.scale, params.scale);
+                    }
+                }
+            }
+        }
+
+        function animate() {
+            update();
+            draw();
+            requestAnimationFrame(animate);
+        }
+
+        initialize();
+        animate();
+    </script>
+</body>
+</html>