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

Scaling a model


In order to change the scale of a model you can adjust the model meets the scene size or construct special effects, such as when a little sprite takes magical water, it suddenly becomes much stronger and bigger. In this recipe, you will learn how to change the model size at runtime.

How to do it...

Follow these steps to scale a 3D model:

  1. 1. Create a Windows Phone Game project named ScaleModel, change Game1.cs to ScaleModelGame.cs. Then add the model file ball.fbx and font file gameFont.fle to the content project.

  2. 2. Declare the necessary variables. Add the following lines to the ScaleModel class field:

    // SpriteFont for showing the scale value on screen
    SpriteFont font;
    // Ball model
    Model modelBall;
    // Tree model world position
    Matrix worldBall = Matrix.Identity;
    // Camera Position
    Vector3 cameraPosition;
    // Camera view matrix
    Matrix view;
    // Camera projection matrix
    Matrix projection;
    // Scale factor
    float scale = 1;
    // The size the model will scale to
    float NewSize = 5;
    
  3. 3...