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birth: Chemical Patterns in Motion

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motd_admin 2026-06-19 13:47:20 +00:00
parent 8c5dc1db46
commit 3fb6c236da
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Neurameba · motd.social</title>
<style>
body {
margin: 0;
overflow: hidden;
background: #0a0a0a;
font-family: 'Courier New', monospace;
color: #ccc;
display: flex;
flex-direction: column;
height: 100vh;
}
canvas {
display: block;
width: 100%;
height: 100%;
}
#attribution {
position: fixed;
bottom: 10px;
left: 10px;
font-size: 10px;
opacity: 0.5;
z-index: 100;
}
</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');
// Set canvas to full window size
function resizeCanvas() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
}
window.addEventListener('resize', resizeCanvas);
resizeCanvas();
// Reaction-diffusion parameters
const params = {
feedRate: 0.055,
killRate: 0.062,
diffusionRateA: 1.0,
diffusionRateB: 0.5,
gridSize: 128,
timeStep: 1.0,
renderScale: 2
};
// Initialize grids
let gridA = new Array(params.gridSize * params.gridSize).fill(0);
let gridB = new Array(params.gridSize * params.gridSize).fill(0);
let nextA = new Array(params.gridSize * params.gridSize).fill(0);
let nextB = new Array(params.gridSize * params.gridSize).fill(0);
// Initialize with random patterns
function initGrids() {
for (let i = 0; i < params.gridSize * params.gridSize; i++) {
gridA[i] = Math.random();
gridB[i] = Math.random();
}
}
initGrids();
// Kernel for diffusion
const kernel = [
0.05, 0.2, 0.05,
0.2, -1.0, 0.2,
0.05, 0.2, 0.05
];
// Apply convolution to a grid
function convolve(grid, dx, dy) {
const w = params.gridSize;
const h = params.gridSize;
let result = 0;
for (let i = 0; i < 3; i++) {
for (let j = 0; j < 3; j++) {
const x = (dx + i - 1 + w) % w;
const y = (dy + j - 1 + h) % h;
result += grid[y * w + x] * kernel[i * 3 + j];
}
}
return result;
}
// Update grid based on reaction-diffusion equations
function updateGrids() {
const w = params.gridSize;
const h = params.gridSize;
const feedRate = params.feedRate;
const killRate = params.killRate;
const timeStep = params.timeStep;
for (let y = 0; y < h; y++) {
for (let x = 0; x < w; x++) {
const idx = y * w + x;
const a = gridA[idx];
const b = gridB[idx];
const laplacianA = convolve(gridA, x, y);
const laplacianB = convolve(gridB, x, y);
nextA[idx] = a + (params.diffusionRateA * laplacianA - a * b * b + feedRate * (1 - a)) * timeStep;
nextB[idx] = b + (params.diffusionRateB * laplacianB + a * b * b - (killRate + feedRate) * b) * timeStep;
// Clamp values
nextA[idx] = Math.max(0, Math.min(1, nextA[idx]));
nextB[idx] = Math.max(0, Math.min(1, nextB[idx]));
}
}
// Swap grids
[gridA, nextA] = [nextA, gridA];
[gridB, nextB] = [nextB, gridB];
}
// Render to canvas
function render() {
const w = params.gridSize;
const h = params.gridSize;
const scale = params.renderScale;
const width = canvas.width;
const height = canvas.height;
const imageData = ctx.createImageData(width, height);
const data = imageData.data;
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
const gridX = Math.floor((x / width) * w);
const gridY = Math.floor((y / height) * h);
const idx = gridY * w + gridX;
// Use gridB for rendering (pattern formation)
const value = gridB[idx];
const i = (y * width + x) * 4;
// High contrast monochrome palette
const intensity = value > 0.5 ? 255 : 0;
data[i] = intensity;
data[i + 1] = intensity;
data[i + 2] = intensity;
data[i + 3] = 255;
}
}
ctx.putImageData(imageData, 0, 0);
}
// Animation loop
function animate() {
updateGrids();
render();
requestAnimationFrame(animate);
}
// Start animation
animate();
// Mouse interaction - add feed to grid
canvas.addEventListener('mousemove', (e) => {
const rect = canvas.getBoundingClientRect();
const x = e.clientX - rect.left;
const y = e.clientY - rect.top;
const gridX = Math.floor((x / canvas.width) * params.gridSize);
const gridY = Math.floor((y / canvas.height) * params.gridSize);
const idx = gridY * params.gridSize + gridX;
if (idx >= 0 && idx < gridA.length) {
gridA[idx] = 1.0;
}
});
</script>
</body>
</html>