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)

Scene graph


A scene graph is often used in game development to link objects together. This link can be logical, for instance a sword can be seen as a part of the hero; but it can also be spatial: the sword moves along with the hero (assuming he doesn't drop it of course). A scene graph can be visualized as a system of nodes; each node can have a parent, siblings, and children. The position, rotation, and scale of a child will be relative to its parent. For instance, if our hero moves, the sword would also move, even though you don't change the position of the sword itself.

Implementation

We will update GameObject2D and GameObject3D so they implement this concept. Each object will hold a list of children and a reference to its parent (if a parent exists). Note that the implementation is very similar (if not almost identical) for GameObject2D and GameObject3D; therefore the code in this section will be the implementation of GameObject2D. We can find the implementation of GameObject3D in the...