Time for action – creating a scene transition

You have, of course, been using scenes all along.

1. Hidden in AppDelegate.cpp, you've had lines like:

   auto scene = GameLayer::scene();
   // run
   director->runWithScene(scene);

2. So, in order to change scenes, all you need to do is tell the Director class which scene you wish it to run. Cocos2d-x will then get rid of all the content in the current scene, if any (all their destructors will be called), and a new layer will be instantiated and wrapped inside the new Scene.
3. Breaking the steps down a little further, this is how you usually create a new scene for Director:

   Scene* MenuLayer::scene()
   {
       // 'scene' is an autorelease object
       auto scene = Scene::create();
       // add layer as a child to scene
       auto layer = new MenuLayer();
       scene->addChild(layer);
       layer->release();
       return scene;
   }

4. The static MenuLayer::scene method will create a blank scene, and then create a new instance of MenuLayer and add it as a...