1. Review Scene Management (Scene, Layer, Director) Sounds Menus
Sprites & Actions

2. Scene a scene is composed of one or more layers
app transitions take place through scenes
typically one scene is used for the “playable” part of the game
others scenes for: title, high scores, options

3. Layer
a layer has the size of the device screen it defines appearance and behavior
overlapping layers are typically given different functions (e.g, background, animation, menu)

4. Director the director takes care of moving between scenes
runWithScene tells director to use that scene
replaceScene replaces the running scene with another
pauseScene puts the current scene on hold for another
transitions allow for fancy scene change
iphone.org/wiki/doku.php/prog_guide:lesson_3._m enus_and_scenes

5. Scene Management We added:
A layer over the game layer showing game statistics
A new scene to go to when the ship hits an asteroid

6. Sound Effects
The library Cocosdenshion subproject of cocos2d-iphone targeted at game audio needs
Sound effects can be loaded at application startup, so there's no delay during play

7. Sound Effects
We added sound files to the 'Resources' Group (crtl-click → Add → Existing Files)
Preload the .wav files in AsteroidsAppDelegate applicationDidFinishLaunching
Play the .wav effects where needed
iphone.org/wiki/doku.php/cocosdenshion:faq

8. Menus In the 'init' method of the AsteroidsScene Layer we:
created the menu, and it's items
describe how they would be displated on the page
Attach the menu to the Layer
We also need to declare the selector method to process user interactions

9. Sprites & Actions
A sprite is a 2d image integrated into a larger scene (from Wikipedia)
They can move and appear to be in active (e.g, blink)
We will tie the sprit into the physics engine so that it can “interact” with other objects
iphone.org/wiki/doku.php/prog_guide:sprites?s[]=s prites

10. Tie in with physics engine
We subclassed CCSprite so that:
The body and colission shape are created at init time
The 'setPosition' method also tells the physics engine
Delete the body and shape with the sprite is deallocated
iphone.org/wiki/doku.php/prog_guide:sprites#how _to_subclass_sprites

11. Ideas of things to do
Use more 'interesting' transitions between scenes
Add sound when the flying saucer enters
Have the flying saucer shoot missiles
Remove the flying saucer when it hits an asteroid