function setup() {

  createCanvas(400, 400);

  fill(0);

  /* if you're on a Mac with a retina screen, 

   * pixel density is 2 and then this library

   * generates a gif at TWICE the size your canvas is

   * so we preemptively set it 1 for all systems

   */

  pixelDensity(1);

  radius = height / 10;

  numX = 80;

  spacingX = width / numX;

  noFill();

​

  createLoop({

    duration: 3,

    gif: true,

    noise: {

      radius: 0.1,

      seed: 99

    }

  });

}

​

function draw() {

  background(255);

​

  beginShape();

  for (var x = 0; x < numX; x++) {

    const scl = animLoop.noise1D(x) * radius;

    vertex(x * spacingX, scl + height / 2);

  }

  endShape();

​

}