round round

let n_same, n, c1, c2, pStr, nStr, sp;
let playBool = true;

function setup() {
  w = max(350, min(windowWidth, windowHeight)) * 0.9;
  n = 0;
  n_same = 0;
  cnv = createCanvas(w, w);
  background(200);
  describe(
    "A square cut into 4 equal squares where the top left and bottom right are cut along the diagonal and shaded darker than the rest of the squares and pieces. The canvas starts bland and the squares are drawn with static-like dots."
  );
  noStroke();
}

function draw() {
  noStroke();
  fill(200);
  rect(0, 0, w, w * 0.05);
  rect(0, w * 0.95, w, w * 0.05);
  fill(0);
  stroke(0);
  if (!mouseIsPressed) {
    text("P: " + str(round(n_same / n, 8)), w - 115, 15);
    text("n: " + str(n), 10, 15);
  }
  if (playBool) {
    for (let i = 0; i < 5000; i++) {
      draw_two();
    }
  }
}

function draw_two() {
  t = frameCount / 100;
  c1 = color(
    2 + 100 * Math.sin(t),
    155 + 100 * Math.sin(t / 4),
    166 + 100 * Math.sin(t / 3),
    20
  );
  c2 = color(
    0 + 100 * Math.sin(t / 5),
    43 + 100 * Math.sin(t / 3),
    46 + 100 * Math.sin(t / 6),
    20
  );
  n1 = Math.random();
  n2 = Math.random();
  n++;
  sum_add_first = round(n1 + n2);
  sum_add_last = round(n1) + round(n2);
  if (sum_add_first === sum_add_last) {
    n_same++;
    stroke(c1);
    s = 1;
  } else {
    stroke(c2);
    s = 1;
  }
  point(w * 0.05 + w * n1 * 0.9, w * 0.05 + w * n2 * 0.9, s);
}

function windowResized() {
  setup();
  draw();
}
function keyPressed() {
  playBool = !playBool;
  if (keyCode === 83) {
    save(cnv, "prob", "png");
  }
}