Lissajous

// Lissajous — harmoniques visuelles
let t = 0;

function draw() {
  const x = cx + amp * Math.sin(freqX * t + phase);
  const y = cy + amp * Math.sin(freqY * t);

  ctx.lineTo(x, y);
  ctx.strokeStyle = 'rgba(200, 241, 53, 0.7)';
  ctx.stroke();

  t += 0.005;
  requestAnimationFrame(draw);
}