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birth: Whispering Chemical Shadows

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motd_admin 2026-07-21 21:47:18 +00:00
parent ef704ced48
commit 6bcf0a03d8
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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>Diffusive Echoes</title>
<style>
body {
margin: 0;
overflow: hidden;
background: #0a0a1a;
font-family: 'Courier New', monospace;
}
#canvas {
display: block;
}
#attribution {
position: fixed;
bottom: 10px;
right: 10px;
color: rgba(255, 255, 255, 0.5);
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();
// Reaction-diffusion parameters
const params = {
feed: 0.055,
kill: 0.062,
deltaTime: 1,
diffusionA: 1,
diffusionB: 0.5,
width: Math.floor(canvas.width / 4),
height: Math.floor(canvas.height / 4),
scale: 4
};
// Simulation state
let grid = createGrid(params.width, params.height);
let nextGrid = createGrid(params.width, params.height);
function createGrid(width, height) {
const grid = new Array(width);
for (let i = 0; i < width; i++) {
grid[i] = new Array(height);
for (let j = 0; j < height; j++) {
grid[i][j] = Math.random() * 0.1;
}
}
return grid;
}
function updateGrid() {
const { width, height, feed, kill, diffusionA, diffusionB } = params;
for (let x = 1; x < width - 1; x++) {
for (let y = 1; y < height - 1; y++) {
const a = grid[x][y];
const b = grid[x][y];
// Compute Laplacian
const laplacianA = (grid[x-1][y] + grid[x+1][y] + grid[x][y-1] + grid[x][y+1] - 4 * a) * diffusionA;
const laplacianB = (grid[x-1][y] + grid[x+1][y] + grid[x][y-1] + grid[x][y+1] - 4 * b) * diffusionB;
// Reaction terms
const reactionA = a * b * b;
const reactionB = a * b * b;
// Update next state
nextGrid[x][y] = a + (laplacianA - reactionA + feed * (1 - a)) * params.deltaTime;
nextGrid[x][y] = Math.max(0, Math.min(1, nextGrid[x][y]));
nextGrid[x][y] = b + (laplacianB + reactionB - kill * b) * params.deltaTime;
nextGrid[x][y] = Math.max(0, Math.min(1, nextGrid[x][y]));
}
}
// Swap grids
[grid, nextGrid] = [nextGrid, grid];
}
function draw() {
const { width, height, scale } = params;
ctx.fillStyle = '#0a0a1a';
ctx.fillRect(0, 0, canvas.width, canvas.height);
for (let x = 0; x < width; x++) {
for (let y = 0; y < height; y++) {
const val = grid[x][y];
if (val > 0.2) {
const intensity = Math.min(1, val * 2);
ctx.fillStyle = `rgba(200, 210, 220, ${intensity * 0.8})`;
ctx.fillRect(x * scale, y * scale, scale, scale);
}
}
}
}
function animate() {
updateGrid();
draw();
requestAnimationFrame(animate);
}
animate();
</script>
</body>
</html>