Animación de partículas de lienzo con interacción del ratón

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Animación de partículas de lienzo con interacción del ratón

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HTML

<!DOCTYPE html>
<html>
<body style="margin:0; overflow:hidden; background:#000;">
<canvas id="c"></canvas>
<script>
const canvas = document.getElementById('c');
const ctx = canvas.getContext('2d');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
let particles = [];

class Particle {
    constructor(x, y) {
        this.x = x; this.y = y;
        this.size = Math.random() * 5 + 1;
        this.speedX = Math.random() * 3 - 1.5;
        this.speedY = Math.random() * 3 - 1.5;
        this.color = `hsl(${Math.random() * 360}, 100%, 50%)`;
    }
    update() {
        this.x += this.speedX; this.y += this.speedY;
        if (this.size > 0.2) this.size -= 0.1;
    }
    draw() {
        ctx.fillStyle = this.color;
        ctx.beginPath(); ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2); ctx.fill();
    }
}

function handle() {
    for (let i = 0; i < particles.length; i++) {
        particles[i].update(); particles[i].draw();
        if (particles[i].size <= 0.2) { particles.splice(i, 1); i--; }
    }
}

window.addEventListener('mousemove', (e) => {
    for (let i = 0; i < 5; i++) particles.push(new Particle(e.x, e.y));
});

function animate() {
    ctx.fillStyle = 'rgba(0,0,0,0.05)'; ctx.fillRect(0, 0, canvas.width, canvas.height);
    handle(); requestAnimationFrame(animate);
}
animate();
</script>
</body>
</html>

CSS