Book Image

Building your First Mobile Game using XNA 4.0

By : Brecht Kets, Thomas Goussaert
Book Image

Building your First Mobile Game using XNA 4.0

By: Brecht Kets, Thomas Goussaert

Overview of this book

With the dawn of the Windows Phone 7 platform, Microsoft has offered us an easy way to create 3D mobile games. In this book, we will build a 3D game for Windows Phone 7 together, taking full advantage of the graphics and touch capabilities, along with the sensors of the platform."Building your First Mobile Game using XNA 4.0" is the book for starting game development on the Windows Phone 7 platform. This book will go over the technical aspects of building games along with designing your own framework. Finally we'll build an actual game together from the ground up! This book will set future mobile game developers in the right direction.The XNA framework empowers us to build 2D and 3D games for PC, Xbox 360 and Windows Phone 7. We will use those capabilities to create stunning 3D games for the Windows Phone 7 platform. We will start by covering the basics like drawing graphics, followed by building a custom framework and end with building a game together!In this book, we will cover drawing 2D and 3D graphics, both static and animations. We will also cover the various ways of handling user input and help set the mood of our game playing both 2D and 3D sound, and accessing the user's media library. The only thing left before building a game is covering several techniques created for making our life easier while building the game, whilst building a framework to do just that. Finally, we'll build a 3D game together that will run on the Windows Phone 7 platform."Building your First Mobile Game using XNA 4.0" is the book you need to get started with mobile game development for Windows Phone 7. Its hands on approach will set you on your way in no time. Let's build some games!
Table of Contents (16 chapters)

Adding movement to the hero


We have a nice static scene now, but it doesn't make much of a game. Let's add some movement to the hero and make him walk over the screen. When he reaches an edge, he will turn back automatically.

The Hero2D class

So we want to add movement to the player. It is best to encapsulate all that new behavior in a class. Let's call class the Hero2D. This class will be responsible for loading the texture, updating the position, and drawing the texture. Make sure the class inherits from GameObject2D class. We could make it inherit from the GameSprite class, but we won't do that. Instead we will add a field of type GameSprite. This is called composition .

In the context of composition, Herb Sutter has said the following:

Prefer composition to inheritance

The reasons why will become obvious when we implement the scene graph and when we make an animated sprite. For now, just go with it.

Fields

The class has three fields, a game sprite, a direction that determines if the player...