180 lines
No EOL
5.9 KiB
HTML
180 lines
No EOL
5.9 KiB
HTML
```html
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<!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>Diffusive Echoes</title>
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<style>
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body {
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margin: 0;
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overflow: hidden;
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background: #0a0a0a;
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display: flex;
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justify-content: center;
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align-items: center;
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height: 100vh;
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font-family: 'Courier New', monospace;
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}
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canvas {
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display: block;
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}
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#attribution {
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position: absolute;
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bottom: 20px;
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color: rgba(255, 255, 255, 0.3);
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font-size: 10px;
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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="attribution">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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// Set canvas to full window size
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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 (adjusted for aesthetic)
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const params = {
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feed: 0.055,
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kill: 0.062,
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diffA: 1.0,
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diffB: 0.5,
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timeStep: 1.0,
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colorShiftSpeed: 0.001,
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densityScale: 0.6
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};
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// Use complexity to vary parameters
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params.diffA = 0.8 + (0.5 * 0.5); // Between 0.8 and 1.05
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params.diffB = 0.4 + (0.5 * 0.2); // Between 0.4 and 0.5
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// Initialize grids
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const size = Math.floor(100 * params.densityScale);
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const gridWidth = Math.floor(canvas.width / size) + 2;
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const gridHeight = Math.floor(canvas.height / size) + 2;
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const grid = new Array(gridWidth * gridHeight);
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const nextGrid = new Array(gridWidth * gridHeight);
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// Fill initial grid with random values
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for (let i = 0; i < grid.length; i++) {
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grid[i] = Math.random() > 0.5 ? 1 : 0;
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nextGrid[i] = 0;
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}
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// Color palette (dryness = monochrome with slight variation)
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let hue = 0;
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function getColor(value) {
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hue = (hue + params.colorShiftSpeed) % 1;
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const intensity = Math.pow(value, 0.5);
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return `hsl(${hue * 60}, ${10 + value * 90}%, ${20 + intensity * 30}%)`;
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}
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// Reaction-diffusion step
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function updateGrid() {
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const width = gridWidth;
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const height = gridHeight;
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for (let x = 1; x < width - 1; x++) {
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for (let y = 1; y < height - 1; y++) {
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const index = x + y * width;
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const currentA = grid[index];
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const currentB = 1 - currentA;
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// Calculate neighborhood sum
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let sumA = 0;
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let sumB = 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 neighborIndex = (x + dx) + (y + dy) * width;
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sumA += grid[neighborIndex];
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sumB += 1 - grid[neighborIndex];
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}
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}
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const neighbors = 8;
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sumA /= neighbors;
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sumB /= neighbors;
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// Reaction-diffusion equations
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const newA = currentA + (
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params.diffA * sumA -
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currentA * currentB * currentB +
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params.feed * (1 - currentA)
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) * params.timeStep;
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const newB = currentB + (
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params.diffB * sumB +
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currentA * currentB * currentB -
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(params.kill + params.feed) * currentB
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) * params.timeStep;
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nextGrid[index] = Math.min(Math.max(newA, 0), 1);
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}
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}
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// Swap grids
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const temp = grid;
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grid.length = 0;
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nextGrid.forEach(val => grid.push(val));
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nextGrid.length = 0;
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for (let i = 0; i < grid.length; i++) {
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nextGrid[i] = 0;
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}
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}
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// Drawing function
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function draw() {
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ctx.globalAlpha = 0.9;
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ctx.fillStyle = 'rgba(10, 10, 10, 0.05)';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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const size = Math.floor(100 * params.densityScale);
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const width = gridWidth;
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const height = gridHeight;
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for (let x = 1; x < width - 1; x++) {
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for (let y = 1; y < height - 1; y++) {
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const index = x + y * width;
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const value = grid[index];
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if (value > 0.5) {
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const px = (x - 1) * size;
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const py = (y - 1) * size;
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ctx.fillStyle = getColor(value);
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ctx.beginPath();
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ctx.arc(px + size/2, py + size/2, size/2 * (0.3 + 0.7 * value), 0, Math.PI * 2);
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ctx.fill();
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}
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}
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}
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}
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// Animation loop
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let lastTime = 0;
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function animate(currentTime) {
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const deltaTime = (currentTime - lastTime) / 1000;
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lastTime = currentTime;
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// Adjust parameters based on motion
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params.feed = 0.055 + Math.sin(currentTime * 0.001) * 0.01;
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params.kill = 0.062 + Math.cos(currentTime * 0.0015) * 0.01;
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updateGrid();
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draw();
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requestAnimationFrame(animate);
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}
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requestAnimationFrame(animate);
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</script>
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</body>
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</html>
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``` |