​

function setup() {

  createCanvas(windowWidth, windowHeight);

  noStroke(0);

}

​

function draw() {

  background(220);

  fill(20, 200, 20);

  for (let x = 0; x < width; x += 1) {

    rect(x, noise(offset + x / 1000) * height, 1, height);

  }

  offset += 0.001;

  textSize(20);

  text(Math.round(offset * 1000) / 1000, 10, 40);

}

​