​

function setup() {

  createCanvas(windowWidth, windowHeight);

}

​

function draw() {

  background(220, 20, 120);

  for (let l = 0; l <= numLines; l += 1) {

    x0 = map(l, 0, numLines, 0, width);

    x1 = map(l, 0, numLines, width / 4, width / 3);

    line(x0, 0, x1, height);

  }

}

​