let min = 40
let max = 101
let speed = 60 # how many degrees in a second

let setup = fn() {
  return {
    .color: {
	  .r: 0,
	  .g: 0,
	  .b: 0,
	},
	.dir: 1,
  };
}

let update = fn(state, input) {
  let dir = state.dir * speed * get_frame_time();
  state.color.g = random_u8() % 1;
  state.color.r = (state.color.r + dir) % max;
  if state.color.r < min {
    state.color.r = min;
  };
  state.dir =
    if state.color.r >= (max - 1) {
	  -1
	} else {
	  if state.color.r <= min {
	    1
      } else {
	    state.dir
	  }
	};
  return state;
}

let draw = fn(state) {
  frame_clear(state.color.r, state.color.g, state.color.b);
}

let migrate = fn(state) {
    return { .player: { .pos: state.player.position } };
}