Book Image

Windows Phone 7 XNA Cookbook

By : Zheng Yang
Book Image

Windows Phone 7 XNA Cookbook

By: Zheng Yang

Overview of this book

Developing games for Windows Phone 7, a new mobile platform, is your big chance to impact the world of mobile games. The XNA 4.0 for Windows Phone 7 integrates a lot of capabilities from software and hardware for you to create incredible games. The next generation of mobile games will be built by you. Windows Phone 7 XNA Cookbook is the best choice for you to make a game on Windows Phone 7. The book helps you to master the indispensable techniques to create your games using XNA 4.0. From the basics such as animating a 2D sprite and interacting with the customized graphical user interface to the more challenging such as 3D graphic rendering and collision detection. This comprehensive cookbook covers all the essential areas of XNA game development for Windows Phone 7, such as approaches to control the sensors, gestures and typical kinds of cameras. We also have recipes for sprite animation, texture rendering, and graphical user interface development that will give you a powerful tool to work with 2D effects. After this we move onto the more juicy stuff with recipes covering 3D graphic rendering and collision detection, and major ways to improve your loading efficiency. You will also work with Xbox live so you can take your game global. Finally, no mobile game development book would be complete without a look at performance optimization to make your games run faster. Windows Phone 7 XNA Cookbook will equip you with the firepower to rock the game world.
Table of Contents (17 chapters)
Windows Phone 7 XNA Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface

Implementing a chase camera


A chase camera will move smoothly around a 3D object and regardless of how the camera view is changed, the camera will restore to its original position. This kind of camera is useful for a racing game or an acceleration effect. In this recipe, you will learn how to make your own chase camera in Windows Phone 7.

How to do it...

  1. 1. Create a Windows Phone Game in Visual Studio 2010, change the name from Game1.cs to ChaseCameraGame.cs. Then add the box.fbx 3D model to the content project. After the initial work, you should insert the following code to the ChaseGameCamera class as fields:

    // Loading for box model
    Model boxModel;
    // Camera View and Projection matrix
    Matrix view;
    Matrix projection;
    // Camera's position
    Vector3 position;
    // Camera look at target
    Vector3 target;
    // Offset distance from the target.
    Vector3 offsetDistance;
    // Yaw, Pitch values
    float yaw;
    float pitch;
    // Angle delta for GestureType.FreeDrag
    Vector3 angle;
    
  2. 2. Instantiate the variables. Add...