let cnvW = 400;

let cnvH = cnvW;

let sw1 = 255;

let sw2 = 50;

let dSlider, sSlider, dt, st;

function setup() {

  createCanvas(cnvW, cnvH);

  dSlider = createSlider(2,floor(cnvW/5),3,1);

  dt = createP();

  sSlider = createSlider(1,floor(cnvW/5),0);

  st = createP();

}

​

function draw() {

  background(170);

  stroke(50);

  strokeWeight(1);

  noFill();

  scale(sSlider.value());

  dt.html(dSlider.value());

  st.html(sSlider.value());

  d = width/dSlider.value();

  for (let i = d; i < width; i+=d) {

    for (let j = d; j < height; j+=d) {

      line(i, 0, i, height);

      line(0, j, width, j);

    }

  }

}