let inc;

let margin = 200;

​

//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

  inc = TWO_PI / spread;

  stroke(255)

  fill(0)

}

​

function draw() {

  background(0);

​

  for (let y = 0; y <= 40; y++) {

    let a = 0.0;

    beginShape();

    for (let x = 0; x <= spread; x++) {

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

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

      curveVertex(x + margin / 2, height - vert - (height-y * 5)+150);

      a = a + inc;

    }

    endShape()

  }

  offset += offsetInc;

}