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

Controlling a model with the help of trackball rotation


To rotate a model from any direction in Windows Phone 7 could let the game player have extra choices to view the model. For programming, the trackball viewer will help the programmer to check whether the output model from the model software works well. In this recipe, you will learn how to control a model in trackball rotation.

How to do it...

Follow these steps to control a model in trackball rotation:

  1. 1. Create a Windows Phone Game named ModelTrackBall, change Game1.cs to ModelTrackBallGame.cs. Then add the tree.fbx model file to the content project.

  2. 2. Declare the variables for rotating and rendering the model in ModelTrackBall class field:

    // Tree model
    Model modelTree;
    // Tree model world position
    Matrix worldTree = Matrix.Identity;
    // Camera Position
    Vector3 cameraPosition;
    // Camera look at target
    Vector3 cameraTarget;
    // Camera view matrix
    Matrix view;
    // Camera projection matrix
    Matrix projection;
    // Angle for trackball rotation...