const cellSize = 2;

let currentRow = 0;

​

function setup() {

  createCanvas(500, 500);

  background("black");

  strokeWeight(0.3);

​

  const numCells = width / cellSize;

  for (let i = 0; i < numCells; i++) {

    cells[i] = 0;

  }

  cells[round(numCells / 2)] = 0;

}

​

function draw() {

  fill("white");

  noStroke();

  translate(0, cellSize * currentRow);

  currentRow++;

  for (let i = 0; i < cells.length; i++) {

    if (cells[i] == 1) {

      fill("black");

      ellipse(i * cellSize, 0, cellSize, cellSize);

      // rotate(2);

    } else if (cells[i] == 2) {

      fill("black");

      stroke("black");

      ellipse(i * cellSize, 0, cellSize, cellSize);

    } else {

      fill("white");

      rect(i * cellSize, 0, cellSize, cellSize);

    }

  }

​

  let newCells = [];

  for (let i = 0; i < cells.length; i++) {

    let sum = 2;

    let nSize = 4;

    for (let n = -nSize; n <= nSize; n++) {

      sum = sum + (cells[i + n] ?? 0);

    }

​

    if (sum % 1 || sum % 4) {

      newCells[i] = 2;

    } else if (sum < 2) {

      newCells[i] = 1;

    } else {

      newCells[i] = 0;

    }

  }

  cells = newCells;

}

​