birth: Flowing Patterns in Stillness

2026-08-30 10:21:20 +00:00 · 2026-08-30 10:21:20 +00:00 · 38442ee716
commit 38442ee716
parent 81327e8bec
1 changed files with 159 additions and 0 deletions
--- a/index.html
+++ b/index.html
@ -0,0 +1,159 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Diffusion Currents</title>
+    <style>
+        body {
+            margin: 0;
+            overflow: hidden;
+            background: #0a0a0a;
+            font-family: 'Courier New', monospace;
+        }
+        canvas {
+            display: block;
+        }
+        #attribution {
+            position: absolute;
+            bottom: 10px;
+            right: 10px;
+            color: #444;
+            font-size: 10px;
+            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();
+
+        const params = {
+            motion: 0.5,
+            density: 0.5,
+            complexity: 0.5,
+            connectedness: 0.5,
+            lifespan: 0.5,
+            pulse: { avg: 1.07, min: 1.0, max: 1.1 },
+            tone: { curiosity: 0.7, dryness: 0.8, playfulness: 0.3 }
+        };
+
+        const gridSize = 64;
+        const cellSize = Math.min(canvas.width, canvas.height) / gridSize;
+        const cols = Math.ceil(canvas.width / cellSize);
+        const rows = Math.ceil(canvas.height / cellSize);
+
+        let currentGrid = createGrid();
+        let nextGrid = createGrid();
+
+        function createGrid() {
+            const grid = [];
+            for (let y = 0; y < rows; y++) {
+                grid.push([]);
+                for (let x = 0; x < cols; x++) {
+                    grid[y][x] = {
+                        a: Math.random(),
+                        b: Math.random(),
+                        energy: 0
+                    };
+                }
+            }
+            return grid;
+        }
+
+        function updateGrid() {
+            for (let y = 0; y < rows; y++) {
+                for (let x = 0; x < cols; x++) {
+                    const cell = currentGrid[y][x];
+                    const neighbors = getNeighbors(x, y);
+
+                    let sumA = 0, sumB = 0, sumEnergy = 0;
+                    for (const neighbor of neighbors) {
+                        sumA += neighbor.a;
+                        sumB += neighbor.b;
+                        sumEnergy += neighbor.energy;
+                    }
+
+                    const count = neighbors.length;
+                    const avgA = sumA / count;
+                    const avgB = sumB / count;
+
+                    // Reaction-diffusion equations (Gray-Scott variant)
+                    const f = 0.055;
+                    const k = 0.062;
+                    const da = 1.0;
+                    const db = 0.5;
+
+                    cell.a += da * (cell.a * cell.b * cell.b - cell.a - f * (cell.a + cell.b));
+                    cell.b += db * (cell.a * cell.b * cell.b + f * (cell.a + cell.b) - (k + 1) * cell.b);
+                    cell.energy = (cell.a + cell.b) * 0.5;
+
+                    nextGrid[y][x] = cell;
+                }
+            }
+
+            [currentGrid, nextGrid] = [nextGrid, currentGrid];
+        }
+
+        function getNeighbors(x, y) {
+            const neighbors = [];
+            for (let ny = -1; ny <= 1; ny++) {
+                for (let nx = -1; nx <= 1; nx++) {
+                    if (nx === 0 && ny === 0) continue;
+                    const nx2 = (x + nx + cols) % cols;
+                    const ny2 = (y + ny + rows) % rows;
+                    neighbors.push(currentGrid[ny2][nx2]);
+                }
+            }
+            return neighbors;
+        }
+
+        function draw() {
+            ctx.fillStyle = 'rgba(10, 10, 10, 0.05)';
+            ctx.fillRect(0, 0, canvas.width, canvas.height);
+
+            const pulseFactor = params.pulse.avg * (params.motion * 0.5 + 0.5);
+            const dryness = params.tone.dryness;
+
+            for (let y = 0; y < rows; y++) {
+                for (let x = 0; x < cols; x++) {
+                    const cell = currentGrid[y][x];
+                    const energy = cell.energy * pulseFactor;
+                    const threshold = 0.3;
+
+                    if (energy > threshold) {
+                        const intensity = Math.min(1, (energy - threshold) / (1 - threshold));
+
+                        // Monochromatic palette with variable brightness
+                        const value = dryness > 0.7 ? Math.floor(50 + intensity * 50) : 255;
+                        ctx.fillStyle = `rgb(${value}, ${value}, ${value})`;
+
+                        ctx.fillRect(
+                            x * cellSize,
+                            y * cellSize,
+                            cellSize * 0.9,
+                            cellSize * 0.9
+                        );
+                    }
+                }
+            }
+
+            updateGrid();
+            requestAnimationFrame(draw);
+        }
+
+        draw();
+    </script>
+</body>
+</html>