163 lines
No EOL
5.3 KiB
HTML
163 lines
No EOL
5.3 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 Study</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: fixed;
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bottom: 10px;
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right: 10px;
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color: #444;
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font-size: 10px;
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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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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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// Flow field parameters
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const particleCount = 150 * (0.5 + 0.5);
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const particleSize = 1.5 * (0.5 + 0.5);
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const motionStrength = 0.8 * (0.5 + 0.5);
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const complexityFactor = 0.7;
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const connectednessFactor = 0.6;
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const baseSpeed = 0.5;
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const maxSpeed = 2.0;
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const trailLength = 5 * (1.1 - 0.5);
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// Tone parameters
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const dryness = 0.9;
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const playfulness = 0.1;
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const curiosity = 0.8;
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// Color palette based on tone
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const hue = (curiosity * 180) + 100; // Teal range
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const saturation = 0.8 - (dryness * 0.5);
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const brightness = 0.7 - (playfulness * 0.2);
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// Flow field grid
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const gridSize = 30;
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const cols = Math.floor(canvas.width / gridSize) + 1;
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const rows = Math.floor(canvas.height / gridSize) + 1;
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// Precompute flow field
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const flowField = [];
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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.sin(x * complexityFactor) * Math.cos(y * complexityFactor) * Math.PI * 2;
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const vx = Math.cos(angle) * motionStrength;
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const vy = Math.sin(angle) * motionStrength;
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flowField.push({ x: x * gridSize, y: y * gridSize, vx, vy });
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}
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}
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// Particles
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class Particle {
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constructor() {
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this.reset();
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}
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reset() {
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this.x = Math.random() * canvas.width;
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this.y = Math.random() * canvas.height;
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this.speed = baseSpeed + Math.random() * (maxSpeed - baseSpeed);
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this.direction = Math.random() * Math.PI * 2;
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this.velocity = { x: 0, y: 0 };
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this.history = [];
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}
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update() {
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// Find nearest flow field point
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const col = Math.floor(this.x / gridSize);
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const row = Math.floor(this.y / gridSize);
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const index = row * cols + col;
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if (index >= 0 && index < flowField.length) {
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const field = flowField[index];
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this.direction += (Math.atan2(field.vy, field.vx) - this.direction) * 0.1;
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}
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// Update velocity
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this.velocity.x = Math.cos(this.direction) * this.speed;
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this.velocity.y = Math.sin(this.direction) * this.speed;
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// Apply motion
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this.x += this.velocity.x;
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this.y += this.velocity.y;
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// Boundary check
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if (this.x < 0) this.x = canvas.width;
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if (this.x > canvas.width) this.x = 0;
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if (this.y < 0) this.y = canvas.height;
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if (this.y > canvas.height) this.y = 0;
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// Add to history
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this.history.push({ x: this.x, y: this.y });
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if (this.history.length > trailLength) {
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this.history.shift();
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}
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}
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draw() {
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ctx.strokeStyle = `hsla(${hue}, ${saturation * 100}%, ${brightness * 100}%, 0.8)`;
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ctx.lineWidth = particleSize * (0.5 + 0.5);
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ctx.beginPath();
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for (let i = 0; i < this.history.length; i++) {
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const point = this.history[i];
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const alpha = i / this.history.length;
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ctx.globalAlpha = alpha * 0.7;
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if (i === 0) {
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ctx.moveTo(point.x, point.y);
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} else {
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ctx.lineTo(point.x, point.y);
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}
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}
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ctx.stroke();
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ctx.globalAlpha = 1.0;
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}
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}
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const particles = Array.from({ length: particleCount }, () => new Particle());
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function animate() {
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// Fade background slightly
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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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// Update and draw all particles
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particles.forEach(particle => {
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particle.update();
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particle.draw();
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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> |