124 lines
No EOL
4.2 KiB
HTML
124 lines
No EOL
4.2 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>Gray Nebula</title>
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<style>
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body { margin: 0; overflow: hidden; background: #000; }
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canvas { display: block; }
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#info { position: absolute; bottom: 10px; right: 10px; color: #777; font-family: monospace; font-size: 11px; }
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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 resize() {
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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', resize);
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resize();
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// Reaction-diffusion parameters (Gray-Scott model)
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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,
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diffusionB: 0.5,
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timeStep: 0.01,
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scale: 10,
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colorOffset: 0.2
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};
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// Grid setup
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const cols = Math.floor(canvas.width / params.scale);
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const rows = Math.floor(canvas.height / params.scale);
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let grid = new Array(cols).fill().map(() => new Array(rows).fill(0));
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let nextGrid = new Array(cols).fill().map(() => new Array(rows).fill(0));
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function initialize() {
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// Randomize initial state with density
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for (let i = 0; i < cols; i++) {
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for (let j = 0; j < rows; j++) {
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grid[i][j] = Math.random() * 0.2;
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}
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}
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// Add some central patterns
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const centerX = Math.floor(cols / 2);
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const centerY = Math.floor(rows / 2);
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for (let i = -10; i <= 10; i++) {
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for (let j = -10; j <= 10; j++) {
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if (Math.sqrt(i*i + j*j) < 10) {
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grid[centerX + i][centerY + j] = 0.5 + Math.random() * 0.3;
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}
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}
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}
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}
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function update() {
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for (let i = 1; i < cols - 1; i++) {
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for (let j = 1; j < rows - 1; j++) {
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const a = grid[i][j];
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const b = grid[i][j] - a;
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// Reaction-diffusion equations
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const laplacianA = (grid[i-1][j] + grid[i+1][j] + grid[i][j-1] + grid[i][j+1] - 4 * a) * params.diffusionA;
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const laplacianB = (grid[i-1][j] + grid[i+1][j] + grid[i][j-1] + grid[i][j+1] - 4 * b) * params.diffusionB;
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nextGrid[i][j] = a + params.timeStep * (
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params.feed * (1 - a) * b - params.kill * a + laplacianA
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);
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nextGrid[i][j] += params.timeStep * (
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-params.feed * (1 - a) * b + params.kill * a + laplacianB
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);
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}
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}
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// Swap grids
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[grid, nextGrid] = [nextGrid, grid];
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// Boundary conditions
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for (let i = 0; i < cols; i++) {
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grid[i][0] = grid[i][1];
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grid[i][rows-1] = grid[i][rows-2];
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}
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for (let j = 0; j < rows; j++) {
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grid[0][j] = grid[1][j];
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grid[cols-1][j] = grid[cols-2][j];
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}
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}
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function draw() {
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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for (let i = 0; i < cols; i++) {
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for (let j = 0; j < rows; j++) {
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const val = grid[i][j];
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if (val > 0) {
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const brightness = Math.max(0, Math.min(1, val * 2));
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const hue = (180 + val * 10) % 360;
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ctx.fillStyle = `hsl(${hue}, 0%, ${100 - brightness * 100}%)`;
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ctx.fillRect(i * params.scale, j * params.scale, params.scale, params.scale);
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}
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}
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}
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}
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function animate() {
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update();
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draw();
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requestAnimationFrame(animate);
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}
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initialize();
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animate();
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</script>
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</body>
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</html> |