On to the game world

We'll start by looking at the CreateGame function that is called from the init function when GameWorld is created:

void GameWorld::CreateGame()
{
  // player starts off with 30 seconds
  time_left_ = 30;

  // create & add the first set of hills at 0
  terrain_ = Terrain::create(world_, 0);
  addChild(terrain_, E_LAYER_FOREGROUND);
  
  // create & add the sky
  sky_ = Sky::create();
  addChild(sky_, E_LAYER_BACKGROUND);

  // create & add the penguin to the hills
  penguin_ = Penguin::create(this, "penguin_1.png");
  terrain_->addChild(penguin_, E_LAYER_FOREGROUND);

  CreateHUD();

  // enable touch and schedule two selectors; the seconds 
    ticker and the update
  setTouchEnabled(true);
  schedule(schedule_selector(GameWorld::Tick), 1.0f);
  scheduleUpdate();
}

We begin this function by initializing a variable called time_left_ to 30. This means that the player starts off with 30 seconds to take the penguin as far as possible. We then create the hills...