let l = a / 10;

​

function setup() {

  // put setup code here

  createCanvas(windowWidth, windowHeight);

​

  background(255);

  stroke("#f09199");

  strokeWeight(5);

  strokeCap(SQUARE);

  noFill();

}

​

function draw() {

  for (let j = 0; j < height; j = j + a) {

    for (let i = 0; i < width; i = i + a) {

      kaminari(i, j);

    }

  }

}

​

function kaminari(x, y) {

  push();

  translate(x, y);

​

  let ll = l + l;

​

  beginShape();

  for (let i = 0; i < 3; i++) {

    vertex(-1 * ll * i, -1 * ll * i);

    vertex(ll * (i + 1), -1 * ll * i);

    vertex(ll * (i + 1), ll * (i + 1));

    vertex(-1 * ll * (i + 1), ll * (i + 1));

  }

​

  /*

   vertex(0, 0);

   vertex(l+l, 0);

   vertex(l+l, l+l);

   vertex(-(l+l), l+l);

   vertex(-(l+l), -(l+l));

   vertex(2*(l+l), -(l+l));

   vertex(2*(l+l), 2*(l+l));

   vertex(-2*(l+l), 2*(l+l));

   vertex(-2*(l+l), -2*(l+l));

   vertex(3*(l+l), -2*(l+l));

   vertex(3*(l+l), 3*(l+l));

   vertex(-3*(l+l), 3*(l+l));

   */

  endShape();

  pop();

}

​