let margin = 200;

let spread;

​

//noise settings

let offset = 0;

let offsetInc = 0.05

let rowOffset = 60

let lineMultiplier = 80

​

function setup() {

  createCanvas(400, 400);

  background(200)

  spread = width-margin

  stroke(255)

  fill(0)

}

​

function draw() {

  background(0);

  let a = 0.0;

  let inc = TWO_PI / spread;

  beginShape();

  for (let i = 0; i <= spread; i++) {

    let n = noise(offset+i/rowOffset)*lineMultiplier

    let point = ((1 - sin(a + PI / 2)) * n)

    curveVertex(i+margin/2, height - point);

    a = a + inc;

  }

  endShape()

  offset += offsetInc;

}