180 lines
No EOL
5.8 KiB
HTML
180 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>Flow Field Canvas</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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}
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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: 10px;
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left: 10px;
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color: #666;
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font-size: 10px;
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pointer-events: none;
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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="c"></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('c');
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const c = 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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// Flow field parameters
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const motion = 0.5;
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const density = 0.5;
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const complexity = 0.5;
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const connectedness = 0.5;
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const lifespan = 0.5;
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const pulseAvg = 1.08;
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const pulseVariation = 0.05;
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// Create flow field
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const fieldSize = Math.min(50, Math.max(10, 30 - complexity * 20));
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const cols = Math.floor(canvas.width / fieldSize) + 1;
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const rows = Math.floor(canvas.height / fieldSize) + 1;
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const field = [];
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for (let y = 0; y < rows; y++) {
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field[y] = [];
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for (let x = 0; x < cols; x++) {
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// Create a field where vectors point outward from center
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const angle = Math.atan2(
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y - rows/2,
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x - cols/2
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);
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const length = 0.5 + Math.sin(Date.now() * 0.0005) * 0.5 * connectedness;
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field[y][x] = {
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angle: angle,
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length: length,
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x: x * fieldSize,
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y: y * fieldSize
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};
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}
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}
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// Create particles
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const particleCount = Math.floor(500 + density * 1500);
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const particles = [];
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const colors = ['#ddd', '#ccc', '#bbb', '#aaa'];
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for (let i = 0; i < particleCount; i++) {
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particles.push({
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x: Math.random() * canvas.width,
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y: Math.random() * canvas.height,
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vx: 0,
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vy: 0,
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size: 0.5 + Math.random() * 2,
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color: colors[Math.floor(Math.random() * colors.length)],
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life: 0,
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maxLife: 100 + Math.random() * 100 * (1 - lifespan),
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trail: []
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});
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}
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function animate() {
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c.fillStyle = 'rgba(0, 0, 0, 0.05)';
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c.fillRect(0, 0, canvas.width, canvas.height);
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const time = Date.now() * 0.001;
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const pulse = pulseAvg + Math.sin(time * 2) * pulseVariation * connectedness;
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// Update field
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for (let y = 0; y < rows; y++) {
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for (let x = 0; x < cols; x++) {
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const angle = Math.atan2(
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y - rows/2,
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x - cols/2
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) + Math.sin(time * 0.5) * 0.5 * motion;
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field[y][x].angle = angle;
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}
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}
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// Update particles
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for (const p of particles) {
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// Get field vector
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const col = Math.floor(p.x / fieldSize);
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const row = Math.floor(p.y / fieldSize);
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const fieldCell = field[Math.min(row, rows-1)][Math.min(col, cols-1)];
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// Apply field influence
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p.vx += Math.cos(fieldCell.angle) * fieldCell.length * 0.05 * motion;
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p.vy += Math.sin(fieldCell.angle) * fieldCell.length * 0.05 * motion;
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// Add some randomness
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p.vx += (Math.random() - 0.5) * 0.05 * (1 - complexity);
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p.vy += (Math.random() - 0.5) * 0.05 * (1 - complexity);
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// Update position
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p.x += p.vx * pulse;
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p.y += p.vy * pulse;
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// Wrap around edges
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if (p.x < 0) p.x = canvas.width;
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if (p.x > canvas.width) p.x = 0;
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if (p.y < 0) p.y = canvas.height;
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if (p.y > canvas.height) p.y = 0;
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// Update trail
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p.trail.push({x: p.x, y: p.y});
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if (p.trail.length > 100) {
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p.trail.shift();
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}
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// Update life
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p.life += 0.5;
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if (p.life > p.maxLife) {
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p.life = 0;
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p.x = Math.random() * canvas.width;
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p.y = Math.random() * canvas.height;
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p.trail = [];
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}
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}
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// Draw particles
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for (const p of particles) {
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// Draw trail
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c.strokeStyle = p.color;
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c.lineWidth = p.size * 0.5;
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c.beginPath();
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for (let i = 0; i < p.trail.length; i++) {
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const pos = p.trail[i];
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const nextPos = p.trail[i + 1];
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if (nextPos) {
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c.moveTo(pos.x, pos.y);
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c.lineTo(nextPos.x, nextPos.y);
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}
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}
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c.stroke();
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// Draw particle
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c.fillStyle = p.color;
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c.beginPath();
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c.arc(p.x, p.y, p.size, 0, Math.PI * 2);
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c.fill();
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}
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requestAnimationFrame(animate);
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}
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animate();
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</script>
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</body>
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</html> |