birth: Chemical Rorschach in Motion
This commit is contained in:
parent
2c9d1e1810
commit
ca8197d810
1 changed files with 166 additions and 0 deletions
166
index.html
Normal file
166
index.html
Normal file
|
|
@ -0,0 +1,166 @@
|
|||
<!DOCTYPE html>
|
||||
<html lang="en">
|
||||
<head>
|
||||
<meta charset="UTF-8">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||||
<title>Neurameba Chemical Rorschach</title>
|
||||
<style>
|
||||
body {
|
||||
margin: 0;
|
||||
overflow: hidden;
|
||||
background: #0a0a0a;
|
||||
font-family: 'Courier New', monospace;
|
||||
color: #aaa;
|
||||
}
|
||||
#canvas {
|
||||
display: block;
|
||||
}
|
||||
#attribution {
|
||||
position: fixed;
|
||||
bottom: 10px;
|
||||
right: 10px;
|
||||
font-size: 10px;
|
||||
opacity: 0.5;
|
||||
}
|
||||
</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,
|
||||
initialSeedRadius: 0.15,
|
||||
colorA: [230, 230, 230],
|
||||
colorB: [50, 50, 50],
|
||||
timeScale: 0.8,
|
||||
motion: 0.5
|
||||
};
|
||||
|
||||
// Create grid
|
||||
const width = Math.floor(canvas.width / 2);
|
||||
const height = Math.floor(canvas.height / 2);
|
||||
let grid = new Array(width * height * 4).fill(0);
|
||||
let nextGrid = new Array(width * height * 4).fill(0);
|
||||
|
||||
// Initialize with sparse random seed
|
||||
function initializeGrid() {
|
||||
for (let i = 0; i < width * height; i++) {
|
||||
const idx = i * 4;
|
||||
if (Math.random() < params.initialSeedRadius) {
|
||||
grid[idx] = 1 + Math.random() * 0.1;
|
||||
} else {
|
||||
grid[idx] = 0.5;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Reaction-diffusion step
|
||||
function updateGrid() {
|
||||
for (let x = 1; x < width - 1; x++) {
|
||||
for (let y = 1; y < height - 1; y++) {
|
||||
const idx = (x + y * width) * 4;
|
||||
|
||||
const a = grid[idx];
|
||||
const b = grid[idx + 1];
|
||||
|
||||
const laplaceA = getLaplace(x, y, 0);
|
||||
const laplaceB = getLaplace(x, y, 1);
|
||||
|
||||
const reaction = a * b * b;
|
||||
const newA = a + (params.diffusionRateA * laplaceA - reaction + params.feedRate * (1 - a)) * params.timeScale;
|
||||
const newB = b + (params.diffusionRateB * laplaceB + reaction - (params.feedRate + params.killRate) * b) * params.timeScale;
|
||||
|
||||
nextGrid[idx] = Math.max(0, Math.min(1, newA));
|
||||
nextGrid[idx + 1] = Math.max(0, Math.min(1, newB));
|
||||
nextGrid[idx + 2] = 0;
|
||||
nextGrid[idx + 3] = 255;
|
||||
}
|
||||
}
|
||||
|
||||
// Swap grids
|
||||
[grid, nextGrid] = [nextGrid, grid];
|
||||
}
|
||||
|
||||
// Calculate laplacian
|
||||
function getLaplace(x, y, component) {
|
||||
let sum = 0;
|
||||
sum += grid[((x-1) + y * width) * 4 + component];
|
||||
sum += grid[((x+1) + y * width) * 4 + component];
|
||||
sum += grid[(x + (y-1) * width) * 4 + component];
|
||||
sum += grid[(x + (y+1) * width) * 4 + component];
|
||||
sum += 0.5 * (grid[((x-1) + (y-1) * width) * 4 + component] +
|
||||
grid[((x+1) + (y-1) * width) * 4 + component] +
|
||||
grid[((x-1) + (y+1) * width) * 4 + component] +
|
||||
grid[((x+1) + (y+1) * width) * 4 + component]);
|
||||
return sum / 6 - grid[(x + y * width) * 4 + component];
|
||||
}
|
||||
|
||||
// Draw grid
|
||||
function drawGrid() {
|
||||
const imageData = ctx.createImageData(width, height);
|
||||
const data = imageData.data;
|
||||
|
||||
for (let i = 0; i < width * height; i++) {
|
||||
const idx = i * 4;
|
||||
const a = grid[idx];
|
||||
const b = grid[idx + 1];
|
||||
|
||||
// Grayscale based on reaction product
|
||||
let val = Math.pow(b * (1 - a), 0.3) * 255;
|
||||
val = Math.min(255, val);
|
||||
|
||||
data[idx] = params.colorA[0] - val * 0.6;
|
||||
data[idx + 1] = params.colorA[1] - val * 0.4;
|
||||
data[idx + 2] = params.colorA[2];
|
||||
data[idx + 3] = 255;
|
||||
}
|
||||
|
||||
// Scale up to canvas size
|
||||
const scaled = ctx.createImageData(canvas.width, canvas.height);
|
||||
for (let y = 0; y < canvas.height; y++) {
|
||||
for (let x = 0; x < canvas.width; x++) {
|
||||
const srcX = Math.floor(x / 2);
|
||||
const srcY = Math.floor(y / 2);
|
||||
const srcIdx = (srcX + srcY * width) * 4;
|
||||
const dstIdx = (x + y * canvas.width) * 4;
|
||||
|
||||
scaled.data[dstIdx] = data[srcIdx];
|
||||
scaled.data[dstIdx + 1] = data[srcIdx + 1];
|
||||
scaled.data[dstIdx + 2] = data[srcIdx + 2];
|
||||
scaled.data[dstIdx + 3] = data[srcIdx + 3];
|
||||
}
|
||||
}
|
||||
|
||||
ctx.putImageData(scaled, 0, 0);
|
||||
}
|
||||
|
||||
// Animation loop
|
||||
function animate() {
|
||||
updateGrid();
|
||||
drawGrid();
|
||||
requestAnimationFrame(animate);
|
||||
}
|
||||
|
||||
// Initialize and start
|
||||
initializeGrid();
|
||||
animate();
|
||||
</script>
|
||||
</body>
|
||||
</html>
|
||||
Loading…
Add table
Reference in a new issue