function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(100);

  stroke(0);

  noFill();

  noiseMode("SINE");

  beginShape();

  translate(200, 200);

  for (let i = -200; i < width; i++) {

    vertex(i, getNoise(i) * 200);

  }

  endShape();

}

​

function noiseMode(mode) {

  noise_mode = mode;

}

​

function getNoise(seed) {

  if (noise_mode == "RANDOM") {

    randomSeed(seed);

    return random(0, 1);

  } else if (noise_mode == "SINE") {

    return noise(seed);

  }

}

​