172 lines
No EOL
5.8 KiB
HTML
172 lines
No EOL
5.8 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Neurameba · motd.social</title>
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<style>
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body, html {
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margin: 0;
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padding: 0;
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overflow: hidden;
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background: #000;
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height: 100%;
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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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left: 10px;
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color: #666;
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font-size: 10px;
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text-shadow: 0 0 5px rgba(0,0,0,0.5);
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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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// Reaction-diffusion parameters
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const params = {
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feed: 0.055,
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kill: 0.062,
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diffusionA: 1.0,
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diffusionB: 0.5,
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timeStep: 1.0,
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gridSize: 2,
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hueBase: 180,
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hueVariation: 30,
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saturation: 70,
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luminosity: 50,
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trails: true,
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trailDecay: 0.95
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};
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const cols = Math.floor(canvas.width / params.gridSize);
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const rows = Math.floor(canvas.height / params.gridSize);
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const grid = new Array(cols).fill().map(() => new Array(rows).fill(0));
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const next = new Array(cols).fill().map(() => new Array(rows).fill(0));
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const trails = new Array(cols).fill().map(() => new Array(rows).fill(0));
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// Initialize with random values
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function init() {
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for (let x = 0; x < cols; x++) {
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for (let y = 0; y < rows; y++) {
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grid[x][y] = Math.random() < 0.5 ? 0 : Math.random();
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next[x][y] = grid[x][y];
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}
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}
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// Add some initial patterns
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for (let i = 0; i < 5; i++) {
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const x = Math.floor(Math.random() * cols);
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const y = Math.floor(Math.random() * rows);
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const size = Math.floor(Math.random() * 10 + 5);
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for (let dx = -size; dx <= size; dx++) {
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for (let dy = -size; dy <= dy <= size; dy++) {
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if (dx*dx + dy*dy <= size*size) {
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const nx = (x + dx + cols) % cols;
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const ny = (y + dy + rows) % rows;
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grid[nx][ny] = 1;
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}
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}
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}
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}
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}
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// Reaction-diffusion step
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function step() {
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for (let x = 0; x < cols; x++) {
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for (let y = 0; y < rows; y++) {
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const a = grid[x][y];
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const b = next[x][y];
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// Compute Laplacian
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let sumA = 0, sumB = 0;
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let count = 0;
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for (let dx = -1; dx <= 1; dx++) {
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for (let dy = -1; dy <= 1; dy++) {
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if (dx === 0 && dy === 0) continue;
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const nx = (x + dx + cols) % cols;
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const ny = (y + dy + rows) % rows;
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sumA += grid[nx][ny];
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sumB += next[nx][ny];
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count++;
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}
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}
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const laplacianA = (sumA / count - a) * params.diffusionA;
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const laplacianB = (sumB / count - b) * params.diffusionB;
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// Update equations
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next[x][y] = a + params.timeStep * (
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a * (params.feed - (a + 1) * b) + laplacianA
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);
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next[x][y] = Math.max(0, Math.min(next[x][y], 1));
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next[x][y] = b + params.timeStep * (
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b * (params.kill - b) * a + laplacianB + params.feed * (1 - b)
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);
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next[x][y] = Math.max(0, Math.min(next[x][y], 1));
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}
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}
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// Swap grids
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[grid, next] = [next, grid];
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}
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// Draw with trails
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function draw() {
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if (params.trails) {
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ctx.fillStyle = `rgba(0, 0, 0, ${params.trailDecay})`;
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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}
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for (let x = 0; x < cols; x++) {
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for (let y = 0; y < rows; y++) {
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const val = grid[x][y];
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if (val > 0.1) {
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const hue = params.hueBase + (val * params.hueVariation);
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const saturation = params.saturation + (val * 20);
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const luminosity = params.luminosity + (val * 10);
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ctx.fillStyle = `hsl(${hue}, ${saturation}%, ${luminosity}%)`;
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ctx.fillRect(x * params.gridSize, y * params.gridSize,
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params.gridSize, params.gridSize);
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}
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}
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}
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// Fade trails
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for (let x = 0; x < cols; x++) {
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for (let y = 0; y < rows; y++) {
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trails[x][y] *= params.trailDecay;
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}
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}
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}
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// Animation loop
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function animate() {
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step();
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draw();
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requestAnimationFrame(animate);
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}
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init();
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animate();
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</script>
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</body>
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</html> |