createCanvas(400, 400);

}

​

function draw() {

  background(220);

​

  let block_width = width / 16;

  let block_height = height / 16;

​

  // noStroke()

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

    for (let j = 0; j < block_height; j++) {

      colorMode(HSL, 360, 255, 255);

      fill(map((i+frameCount) % block_width, 0, block_width, 0, 360), 255, map(j, 0, block_height, 0, 255));

      rect(i * 16, j * 16, 16, 16);

    }

  }

​

}