birth: Muted Pulse in Grayscale
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index.html
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184
index.html
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Neurameba Pattern</title>
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<style>
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body {
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margin: 0;
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overflow: hidden;
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background: #000;
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font-family: monospace;
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}
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canvas {
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display: block;
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}
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#info {
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position: absolute;
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bottom: 10px;
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right: 10px;
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color: rgba(255, 255, 255, 0.3);
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font-size: 10px;
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text-align: right;
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}
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</style>
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</head>
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<body>
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<canvas id="canvas"></canvas>
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<div id="info">neurameba · motd.social</div>
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<script>
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const canvas = document.getElementById('canvas');
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const ctx = canvas.getContext('2d');
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function resizeCanvas() {
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canvas.width = window.innerWidth;
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canvas.height = window.innerHeight;
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}
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window.addEventListener('resize', resizeCanvas);
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resizeCanvas();
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// Simulation parameters derived from organism data
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const params = {
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motion: 0.5,
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density: 0.5,
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complexity: 0.5,
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connectedness: 0.5,
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lifespan: 0.5,
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pulse: 1.08,
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tone: {
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anger: 0.0,
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sadness: 0.0,
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curiosity: 0.1,
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dryness: 0.9,
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playfulness: 0.0,
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tension: 0.0
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}
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};
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// Reaction-diffusion simulation
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const gridSize = Math.min(50, Math.max(20, Math.floor(20 + params.density * 30)));
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const cellSize = Math.min(window.innerWidth, window.innerHeight) / gridSize;
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const cols = Math.ceil(window.innerWidth / cellSize);
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const rows = Math.ceil(window.innerHeight / cellSize);
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// Gray-Scott parameters (scaled from organism parameters)
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const F = 0.055 + params.complexity * 0.02;
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const k = 0.062 - params.connectedness * 0.02;
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const feedRate = 0.01 + params.motion * 0.01;
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const killRate = 0.03 + (1 - params.lifespan) * 0.02;
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// State buffers
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let current = new Float64Array(cols * rows * 2);
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let next = new Float64Array(cols * rows * 2);
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// Initialize with sparse, random pattern
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for (let i = 0; i < cols * rows; i++) {
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if (Math.random() < 0.05 * (params.density * 2)) {
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current[i * 2] = 0.5 + (Math.random() - 0.5) * 0.1;
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current[i * 2 + 1] = 0.25 + (Math.random() - 0.5) * 0.05;
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} else {
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current[i * 2] = 0.5 + (Math.random() - 0.5) * 0.01;
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current[i * 2 + 1] = 0.25 + (Math.random() - 0.5) * 0.005;
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}
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}
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// Color palette (monochrome due to high dryness)
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function getColor(u, v) {
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const val = u + v * 0.5;
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const gray = Math.floor(30 + val * 120);
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return `rgb(${gray}, ${gray}, ${gray})`;
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}
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function laplacian(grid, x, y, component) {
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const idx = (y * cols + x) * 2 + component;
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let sum = 0;
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for (let dy = -1; dy <= 1; dy++) {
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for (let dx = -1; dx <= 1; dx++) {
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if (dx === 0 && dy === 0) continue;
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const nx = x + dx;
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const ny = y + dy;
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if (nx >= 0 && nx < cols && ny >= 0 && ny < rows) {
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sum += grid[(ny * cols + nx) * 2 + component];
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}
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}
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}
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return sum / 8 - grid[idx];
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}
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function update() {
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const aspectRatio = window.innerWidth / window.innerHeight;
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const timeStep = 0.1;
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for (let y = 0; y < rows; y++) {
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for (let x = 0; x < cols; x++) {
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const idx = (y * cols + x) * 2;
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const u = current[idx];
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const v = current[idx + 1];
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// Apply Gray-Scott reaction-diffusion
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const uvv = u * v * v;
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const laplacianU = laplacian(current, x, y, 0);
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const laplacianV = laplacian(current, x, y, 1);
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next[idx] = u + timeStep * (
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(feedRate * (1 - u) - uvv + 0.0001 * laplacianU) * params.pulse
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);
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next[idx + 1] = v + timeStep * (
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(-killRate * v + uvv + 0.0001 * laplacianV) * params.pulse
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);
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// Boundary conditions
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if (x === 0 || x === cols - 1 || y === 0 || y === rows - 1) {
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next[idx] = 0.5;
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next[idx + 1] = 0.25;
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}
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}
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}
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// Swap buffers
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[current, next] = [next, current];
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}
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function draw() {
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// Clear canvas with semi-transparent background for trail effect
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ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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for (let y = 0; y < rows; y++) {
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for (let x = 0; x < cols; x++) {
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const idx = (y * cols + x) * 2;
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const u = current[idx];
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const v = current[idx + 1];
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if (u > 0.2 && v > 0.05) {
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const cellX = x * cellSize;
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const cellY = y * cellSize;
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// Size based on complexity and connectedness
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const size = 2 + (u - 0.2) * 10 * params.complexity;
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// Color based on tone parameters
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const val = u + v * 0.5;
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const gray = Math.floor(30 + val * 120);
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ctx.fillStyle = `rgba(${gray}, ${gray}, ${gray}, ${0.5 + u * 0.5})`;
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ctx.fillRect(cellX, cellY, cellSize, cellSize);
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}
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}
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}
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}
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function animate() {
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update();
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draw();
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requestAnimationFrame(animate);
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}
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animate();
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</script>
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</body>
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</html>
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