let pg;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  pg = createGraphics(windowWidth, windowHeight);

  c1 = color(255);

  c2 = color(63, 191, 191);

​

  for (let y = 0; y < height; y++) {

    n = map(y, 0, height, 0, 1);

    let newc = lerpColor(c1, c2, n);

    stroke(newc);

    line(0, y, width, y);

  }

​

}

​

​

function draw() {

  pg.clear();

  pg.fill(255, 0, 0);

  pg.ellipse(150, 150, 200, 200);

  pg.erase();

  pg.rect(160, 160, 20, 20);

  pg.rect(180, 180, 50, 50);

  pg.noErase();

  image(pg, 0, 0);

}