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317 lines (263 loc) · 8.06 KB
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Copy pathscript.js
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317 lines (263 loc) · 8.06 KB
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class Vector2 {
constructor(x = 0, y = 0) {
this.x = x;
this.y = y;
}
add(v) {
this.x += v.x;
this.y += v.y;
return this;
}
sub(v) {
this.x -= v.x;
this.y -= v.y;
return this;
}
mult(scalar) {
this.x *= scalar;
this.y *= scalar;
return this;
}
div(scalar) {
if (scalar !== 0) {
this.x /= scalar;
this.y /= scalar;
}
return this;
}
mag() {
return Math.sqrt(this.x * this.x + this.y * this.y);
}
normalize() {
const m = this.mag();
if (m > 0) {
this.div(m);
}
return this;
}
limit(max) {
if (this.mag() > max) {
this.normalize();
this.mult(max);
}
return this;
}
copy() {
return new Vector2(this.x, this.y);
}
static sub(v1, v2) {
return new Vector2(v1.x - v2.x, v1.y - v2.y);
}
static add(v1, v2) {
return new Vector2(v1.x + v2.x, v1.y + v2.y);
}
static dist(v1, v2) {
return Math.sqrt((v1.x - v2.x) ** 2 + (v1.y - v2.y) ** 2);
}
}
class Boid {
constructor(x, y) {
this.position = new Vector2(x, y);
this.velocity = new Vector2(Math.random() * 2 - 1, Math.random() * 2 - 1);
this.acceleration = new Vector2();
this.maxSpeed = 2;
this.maxForce = 0.03;
this.perceptionRadius = 50;
// Visual properties
this.size = 8;
this.hue = Math.random() * 60 + 180; // Blue-cyan range
}
flock(boids) {
const sep = this.separate(boids);
const ali = this.align(boids);
const coh = this.cohesion(boids);
sep.mult(window.separationWeight);
ali.mult(window.alignmentWeight);
coh.mult(window.cohesionWeight);
this.acceleration.add(sep);
this.acceleration.add(ali);
this.acceleration.add(coh);
}
separate(boids) {
const desiredSeparation = 25;
const steer = new Vector2();
let count = 0;
for (let other of boids) {
const d = Vector2.dist(this.position, other.position);
if (d > 0 && d < desiredSeparation) {
const diff = Vector2.sub(this.position, other.position);
diff.normalize();
diff.div(d);
steer.add(diff);
count++;
}
}
if (count > 0) {
steer.div(count);
steer.normalize();
steer.mult(this.maxSpeed);
steer.sub(this.velocity);
steer.limit(this.maxForce);
}
return steer;
}
align(boids) {
const sum = new Vector2();
let count = 0;
for (let other of boids) {
const d = Vector2.dist(this.position, other.position);
if (d > 0 && d < this.perceptionRadius) {
sum.add(other.velocity);
count++;
}
}
if (count > 0) {
sum.div(count);
sum.normalize();
sum.mult(this.maxSpeed);
const steer = Vector2.sub(sum, this.velocity);
steer.limit(this.maxForce);
return steer;
}
return new Vector2();
}
cohesion(boids) {
const sum = new Vector2();
let count = 0;
for (let other of boids) {
const d = Vector2.dist(this.position, other.position);
if (d > 0 && d < this.perceptionRadius) {
sum.add(other.position);
count++;
}
}
if (count > 0) {
sum.div(count);
return this.seek(sum);
}
return new Vector2();
}
seek(target) {
const desired = Vector2.sub(target, this.position);
desired.normalize();
desired.mult(this.maxSpeed);
const steer = Vector2.sub(desired, this.velocity);
steer.limit(this.maxForce);
return steer;
}
update() {
this.velocity.add(this.acceleration);
this.velocity.limit(this.maxSpeed);
this.position.add(this.velocity);
this.acceleration.mult(0);
// Wrap around edges
if (this.position.x < 0) this.position.x = canvas.width;
if (this.position.x > canvas.width) this.position.x = 0;
if (this.position.y < 0) this.position.y = canvas.height;
if (this.position.y > canvas.height) this.position.y = 0;
}
draw(ctx) {
const theta = Math.atan2(this.velocity.y, this.velocity.x) + Math.PI / 2;
ctx.save();
ctx.translate(this.position.x, this.position.y);
ctx.rotate(theta);
// Create gradient
const gradient = ctx.createRadialGradient(0, 0, 0, 0, 0, this.size);
gradient.addColorStop(0, `hsla(${this.hue}, 80%, 70%, 0.9)`);
gradient.addColorStop(1, `hsla(${this.hue}, 60%, 50%, 0.6)`);
ctx.fillStyle = gradient;
ctx.strokeStyle = `hsla(${this.hue}, 90%, 80%, 0.8)`;
ctx.lineWidth = 1;
// Draw triangle
ctx.beginPath();
ctx.moveTo(0, -this.size);
ctx.lineTo(-this.size * 0.6, this.size * 0.8);
ctx.lineTo(this.size * 0.6, this.size * 0.8);
ctx.closePath();
ctx.fill();
ctx.stroke();
ctx.restore();
}
}
// Initialize canvas and context
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
// Global parameters
window.separationWeight = 1.5;
window.alignmentWeight = 1.0;
window.cohesionWeight = 1.0;
// Initialize boids
let boids = [];
let boidCount = 150;
function initBoids() {
boids = [];
for (let i = 0; i < boidCount; i++) {
boids.push(new Boid(
Math.random() * canvas.width,
Math.random() * canvas.height
));
}
}
// Control handlers
function setupControls() {
const controls = {
separation: (val) => window.separationWeight = parseFloat(val),
alignment: (val) => window.alignmentWeight = parseFloat(val),
cohesion: (val) => window.cohesionWeight = parseFloat(val),
perception: (val) => {
const radius = parseFloat(val);
boids.forEach(boid => boid.perceptionRadius = radius);
},
maxSpeed: (val) => {
const speed = parseFloat(val);
boids.forEach(boid => boid.maxSpeed = speed);
},
boidCount: (val) => {
boidCount = parseInt(val);
initBoids();
}
};
Object.keys(controls).forEach(id => {
const slider = document.getElementById(id);
const valueSpan = document.getElementById(id + 'Value');
slider.addEventListener('input', (e) => {
const value = e.target.value;
valueSpan.textContent = value;
controls[id](value);
});
});
}
// Animation loop
let lastTime = 0;
let frameCount = 0;
let fps = 60;
function animate(currentTime) {
// Calculate FPS
if (currentTime - lastTime >= 1000) {
fps = Math.round(frameCount * 1000 / (currentTime - lastTime));
frameCount = 0;
lastTime = currentTime;
document.getElementById('fps').textContent = fps;
document.getElementById('activeBoids').textContent = boids.length;
}
frameCount++;
// Clear canvas with fade effect
ctx.fillStyle = 'rgba(26, 26, 46, 0.1)';
ctx.fillRect(0, 0, canvas.width, canvas.height);
// Update and draw boids
for (let boid of boids) {
boid.flock(boids);
boid.update();
boid.draw(ctx);
}
requestAnimationFrame(animate);
}
// Initialize
initBoids();
setupControls();
requestAnimationFrame(animate);
// Handle canvas resize
window.addEventListener('resize', () => {
const rect = canvas.getBoundingClientRect();
// Keep canvas size consistent
});