birth: Dry Pulse in Static Zen

2026-06-13 13:47:19 +00:00 · 2026-06-13 13:47:19 +00:00 · 58b2051fc1
commit 58b2051fc1
parent a6ecbbf973
1 changed files with 162 additions and 0 deletions
--- a/index.html
+++ b/index.html
@ -0,0 +1,162 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Neurameba Reaction</title>
+    <style>
+        body {
+            margin: 0;
+            overflow: hidden;
+            background: #0a0a0a;
+            font-family: 'Courier New', monospace;
+            color: #444;
+        }
+        canvas {
+            display: block;
+        }
+        #info {
+            position: absolute;
+            bottom: 20px;
+            left: 20px;
+            font-size: 11px;
+            text-shadow: 0 0 5px #111;
+        }
+    </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 resizeCanvas() {
+            canvas.width = window.innerWidth;
+            canvas.height = window.innerHeight;
+        }
+        window.addEventListener('resize', resizeCanvas);
+        resizeCanvas();
+
+        // Reaction-diffusion parameters
+        const params = {
+            feed: 0.035,
+            kill: 0.065,
+            diffA: 1.0,
+            diffB: 0.5,
+            gridSize: 100,
+            scale: 5,
+            decay: 0.95,
+            pulse: 1.25
+        };
+
+        // Initialize grids
+        let gridA = new Array(params.gridSize * params.gridSize).fill(0);
+        let gridB = new Array(params.gridSize * params.gridSize).fill(0);
+        let displayGrid = new Array(params.gridSize * params.gridSize).fill(0);
+
+        // Random seed
+        function initGrid() {
+            for (let i = 0; i < gridA.length; i++) {
+                gridA[i] = (Math.random() * 0.1 > 0.08) ? 0 : 0.5 + Math.random() * 0.5;
+                gridB[i] = 0;
+            }
+        }
+        initGrid();
+
+        // Reaction-diffusion kernel
+        function update() {
+            const nextA = new Array(params.gridSize * params.gridSize).fill(0);
+            const nextB = new Array(params.gridSize * params.gridSize).fill(0);
+
+            const size = params.gridSize;
+            const width = params.gridSize;
+
+            for (let x = 0; x < width; x++) {
+                for (let y = 0; y < width; y++) {
+                    const i = x + y * width;
+
+                    const idxL = (x - 1 + width) % width + y * width;
+                    const idxR = (x + 1) % width + y * width;
+                    const idxU = x + ((y - 1 + width) % width) * width;
+                    const idxD = x + ((y + 1) % width) * width;
+
+                    const laplacianA = gridA[idxL] + gridA[idxR] + gridA[idxU] + gridA[idxD] - 4 * gridA[i];
+                    const laplacianB = gridB[idxL] + gridB[idxR] + gridB[idxU] + gridB[idxD] - 4 * gridB[i];
+
+                    const reaction = gridA[i] * gridB[i] * gridB[i];
+                    nextA[i] = gridA[i] + (params.diffA * laplacianA - reaction + params.feed * (1 - gridA[i])) * params.pulse;
+                    nextB[i] = gridB[i] + (params.diffB * laplacianB + reaction - (params.kill + params.feed) * gridB[i]) * params.pulse;
+
+                    // Decay
+                    nextA[i] *= params.decay;
+                    nextB[i] *= params.decay;
+
+                    // Normalize to 0-1
+                    nextA[i] = Math.max(0, Math.min(1, nextA[i]));
+                    nextB[i] = Math.max(0, Math.min(1, nextB[i]));
+                }
+            }
+
+            // Swap grids
+            [gridA, gridB] = [nextA, nextB];
+
+            // Calculate display grid (simple reaction visualization)
+            for (let i = 0; i < displayGrid.length; i++) {
+                displayGrid[i] = (gridA[i] - gridB[i] + 1) / 2;
+            }
+        }
+
+        // Animation
+        let animationId;
+        let time = 0;
+
+        function animate() {
+            time += 0.005;
+            params.pulse = 1.0 + 0.5 * Math.sin(time);
+
+            update();
+            draw();
+
+            animationId = requestAnimationFrame(animate);
+        }
+
+        function draw() {
+            const width = params.gridSize;
+            const scale = params.scale;
+
+            ctx.clearRect(0, 0, canvas.width, canvas.height);
+
+            // Draw reaction-diffusion pattern
+            for (let x = 0; x < width; x++) {
+                for (let y = 0; y < width; y++) {
+                    const val = displayGrid[x + y * width];
+                    if (val > 0.01) {
+                        const brightness = Math.pow(val, 0.3);
+                        ctx.fillStyle = `hsl(0, 0%, ${30 + 70 * brightness}%)`;
+                        ctx.fillRect(
+                            x * scale,
+                            y * scale,
+                            scale,
+                            scale
+                        );
+                    }
+                }
+            }
+
+            // Add some motion trails
+            ctx.fillStyle = 'rgba(255, 255, 255, 0.05)';
+            ctx.fillRect(0, 0, canvas.width, canvas.height);
+        }
+
+        // Start animation
+        animate();
+
+        // Cleanup on unload
+        window.addEventListener('beforeunload', () => {
+            cancelAnimationFrame(animationId);
+        });
+    </script>
+</body>
+</html>