185 lines
No EOL
6.4 KiB
HTML
185 lines
No EOL
6.4 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>Diffuse Echo</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: #fff;
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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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flex: 1;
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}
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.info {
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text-align: center;
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padding: 10px;
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font-size: 10px;
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opacity: 0.6;
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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 class="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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feedRate: 0.055,
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killRate: 0.062,
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diffusionA: 1,
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diffusionB: 0.5,
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timeStep: 0.05
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};
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// Grid setup
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const gridSize = 120;
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const cellSize = Math.max(2, Math.floor(Math.min(canvas.width, canvas.height) / gridSize));
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const width = Math.floor(canvas.width / cellSize);
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const height = Math.floor(canvas.height / cellSize);
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// Initialize grids
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const current = new Float32Array(width * height * 4);
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const next = new Float32Array(width * height * 4);
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// Initialize with patterns
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for (let i = 0; i < width * height; i++) {
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const idx = i * 4;
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current[idx] = Math.random() * 0.1 + 0.4;
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current[idx + 1] = 0.1;
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current[idx + 2] = 0.05;
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current[idx + 3] = 1;
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}
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// Add some spots
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for (let i = 0; i < width * height * 0.1; i++) {
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const idx = Math.floor(Math.random() * width * height) * 4;
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current[idx] = 0.8;
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current[idx + 1] = 0.2;
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current[idx + 2] = 0.1;
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}
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function update() {
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// Update reaction-diffusion
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for (let y = 1; y < height - 1; y++) {
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for (let x = 1; x < width - 1; x++) {
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const idx = (y * width + x) * 4;
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const idxL = idx - 4;
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const idxR = idx + 4;
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const idxT = idx - width * 4;
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const idxB = idx + width * 4;
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// Get neighborhood
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const a = current[idx];
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const aL = current[idxL];
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const aR = current[idxR];
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const aT = current[idxT];
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const aB = current[idxB];
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// Gray-Scott reaction
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const ab = a * current[idx + 1];
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const reaction = ab * ab;
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const newA = a +
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(diffusionA * (aL + aR + aT + aB - 4 * a)) * timeStep -
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reaction * timeStep;
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const newB = current[idx + 1] +
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(diffusionB * (current[idxL + 1] + current[idxR + 1] +
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current[idxT + 1] + current[idxB + 1] - 4 * current[idx + 1])) * timeStep +
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reaction * timeStep -
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(params.feedRate * current[idx + 1] + params.killRate * ab) * timeStep;
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next[idx] = newA;
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next[idx + 1] = newB;
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next[idx + 2] = Math.random() * 0.1;
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next[idx + 3] = 1;
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// Boundary conditions
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if (x === 0 || x === width - 1 || y === 0 || y === height - 1) {
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next[idx] = 0;
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next[idx + 1] = 0;
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}
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}
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}
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// Swap buffers
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[current, next].forEach((grid, i) => {
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if (i === 1) {
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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 idx = (y * width + x) * 4;
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current[idx] = grid[idx];
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current[idx + 1] = grid[idx + 1];
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current[idx + 2] = grid[idx + 2];
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}
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}
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}
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});
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// Draw
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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// Create tint based on parameters (dryness = monochrome)
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const hue = Math.sin(Date.now() * 0.0001) * 360;
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ctx.fillStyle = `hsl(${hue}, 10%, 10%)`;
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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// Draw cells
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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 idx = (y * width + x) * 4;
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const a = Math.max(0, Math.min(1, current[idx]));
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const b = Math.max(0, Math.min(1, current[idx + 1]));
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// Create dry/monochrome appearance
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const intensity = Math.pow(a, 0.7) + Math.pow(b, 0.3) * 0.5;
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const gray = Math.floor(255 * intensity);
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const pos = (y * width + x) * 4;
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data[pos] = gray;
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data[pos + 1] = gray;
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data[pos + 2] = gray;
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data[pos + 3] = 255;
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}
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}
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ctx.putImageData(imageData, 0, 0);
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// Add some glow
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const gradient = ctx.createRadialGradient(
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canvas.width / 2, canvas.height / 2, 0,
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canvas.width / 2, canvas.height / 2, Math.min(canvas.width, canvas.height) / 2
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);
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gradient.addColorStop(0, 'rgba(255,255,255,0.05)');
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gradient.addColorStop(1, 'rgba(0,0,0,0.9)');
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ctx.fillStyle = gradient;
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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requestAnimationFrame(update);
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}
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update();
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</script>
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</body>
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</html> |