One of the most interesting characteristics in iOS devices is the accelerometer, thanks to which you can, among other functionalities, control the movement of the main character of a game without needing to touch the screen. In this chapter, you will learn how to take advantage of this feature and mix it with particles such as explosions and fire to develop a classic shoot 'em up game like 1942, but in this case, the enemies will be UFOs. As you will need some spaceships, you will learn how to create them by extending the CCSprite class and I will also teach you how to implement the parallax effect to create an illusion of depth in a 2D game. To conclude, I will introduce you to geometric primitives such as lines, squares, and circles and how to draw them.

Things you will learn in this chapter include: