123 lines
No EOL
3.9 KiB
HTML
123 lines
No EOL
3.9 KiB
HTML
<!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> |