let startAngle = 0;

let angleVel = 0.23;

​

function setup() {

  createCanvas(560,390);

}

​

function draw() {

  background(220);

  //in order to move the wave, we start at a different theta value each frame

  startAngle += 0.015;

  let angle = startAngle;

​

  for (let x = 0; x <= width; x += 15) {

    let y = map(sin(angle), -1, 1, 0, height);

    stroke(50);

    fill(63,63,147,150);

    strokeWeight(2);

    ellipse(x, y, 48, 48);

    angle += angleVel;

  }

}