birth: Chemical Patterns in Motion
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index.html
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189
index.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>Neurameba · motd.social</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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font-family: 'Courier New', monospace;
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color: #ccc;
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display: flex;
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flex-direction: column;
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height: 100vh;
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}
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canvas {
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display: block;
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width: 100%;
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height: 100%;
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}
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#attribution {
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position: fixed;
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bottom: 10px;
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left: 10px;
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font-size: 10px;
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opacity: 0.5;
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z-index: 100;
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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
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const params = {
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feedRate: 0.055,
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killRate: 0.062,
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diffusionRateA: 1.0,
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diffusionRateB: 0.5,
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gridSize: 128,
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timeStep: 1.0,
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renderScale: 2
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};
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// Initialize grids
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let gridA = new Array(params.gridSize * params.gridSize).fill(0);
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let gridB = new Array(params.gridSize * params.gridSize).fill(0);
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let nextA = new Array(params.gridSize * params.gridSize).fill(0);
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let nextB = new Array(params.gridSize * params.gridSize).fill(0);
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// Initialize with random patterns
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function initGrids() {
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for (let i = 0; i < params.gridSize * params.gridSize; i++) {
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gridA[i] = Math.random();
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gridB[i] = Math.random();
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}
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}
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initGrids();
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// Kernel for diffusion
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const kernel = [
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0.05, 0.2, 0.05,
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0.2, -1.0, 0.2,
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0.05, 0.2, 0.05
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];
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// Apply convolution to a grid
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function convolve(grid, dx, dy) {
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const w = params.gridSize;
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const h = params.gridSize;
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let result = 0;
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for (let i = 0; i < 3; i++) {
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for (let j = 0; j < 3; j++) {
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const x = (dx + i - 1 + w) % w;
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const y = (dy + j - 1 + h) % h;
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result += grid[y * w + x] * kernel[i * 3 + j];
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}
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}
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return result;
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}
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// Update grid based on reaction-diffusion equations
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function updateGrids() {
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const w = params.gridSize;
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const h = params.gridSize;
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const feedRate = params.feedRate;
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const killRate = params.killRate;
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const timeStep = params.timeStep;
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for (let y = 0; y < h; y++) {
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for (let x = 0; x < w; x++) {
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const idx = y * w + x;
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const a = gridA[idx];
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const b = gridB[idx];
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const laplacianA = convolve(gridA, x, y);
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const laplacianB = convolve(gridB, x, y);
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nextA[idx] = a + (params.diffusionRateA * laplacianA - a * b * b + feedRate * (1 - a)) * timeStep;
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nextB[idx] = b + (params.diffusionRateB * laplacianB + a * b * b - (killRate + feedRate) * b) * timeStep;
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// Clamp values
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nextA[idx] = Math.max(0, Math.min(1, nextA[idx]));
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nextB[idx] = Math.max(0, Math.min(1, nextB[idx]));
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}
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}
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// Swap grids
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[gridA, nextA] = [nextA, gridA];
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[gridB, nextB] = [nextB, gridB];
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}
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// Render to canvas
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function render() {
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const w = params.gridSize;
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const h = params.gridSize;
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const scale = params.renderScale;
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const width = canvas.width;
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const height = canvas.height;
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const imageData = ctx.createImageData(width, height);
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const data = imageData.data;
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for (let y = 0; y < height; y++) {
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for (let x = 0; x < width; x++) {
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const gridX = Math.floor((x / width) * w);
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const gridY = Math.floor((y / height) * h);
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const idx = gridY * w + gridX;
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// Use gridB for rendering (pattern formation)
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const value = gridB[idx];
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const i = (y * width + x) * 4;
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// High contrast monochrome palette
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const intensity = value > 0.5 ? 255 : 0;
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data[i] = intensity;
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data[i + 1] = intensity;
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data[i + 2] = intensity;
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data[i + 3] = 255;
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}
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}
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ctx.putImageData(imageData, 0, 0);
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}
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// Animation loop
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function animate() {
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updateGrids();
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render();
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requestAnimationFrame(animate);
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}
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// Start animation
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animate();
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// Mouse interaction - add feed to grid
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canvas.addEventListener('mousemove', (e) => {
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const rect = canvas.getBoundingClientRect();
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const x = e.clientX - rect.left;
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const y = e.clientY - rect.top;
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const gridX = Math.floor((x / canvas.width) * params.gridSize);
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const gridY = Math.floor((y / canvas.height) * params.gridSize);
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const idx = gridY * params.gridSize + gridX;
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if (idx >= 0 && idx < gridA.length) {
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gridA[idx] = 1.0;
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}
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});
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</script>
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</body>
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</html>
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