static void varyRoundedBoxWithColor(RoundedBoxWithColor l, int w, int h) {
  int i = random(4);
  if (i == 0) l.a = varyPoint(l.a, w, h);
  else if (i == 1) l.b = varyPoint(l.b, w, h);
  else if (i == 2) l.roundness = max(0, varyInt(l.roundness));
  else l.color = varyColor(l.color);
}