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 an image


Controlling the size of images is a basic technique in Windows Phone 7 XNA programming. Mastering this technique will help you implement many special visual effects in 2D. In this recipe, you will learn how to zoom an image in and out for a special visual effect. As an example, the image will jump up to you and go back. In the jumping phase, the image will fade out gradually. When the image becomes transparent, it will fall back with fading in.

How to do it...

The following mandatory steps will lead you to complete the recipe:

  1. 1. Create a Windows Phone Game in Visual Studio 2010 named ImageZoomInOut, change Game1.cs to ImageZoomGame.cs. Then add the Next.png file from the code bundle to the content project. After the preparation work, insert the following code to the field of the ImageZoomGame class:

    // Image texture object
    Texture2D texImage;
    // Image position
    Vector2 Position;
    // The scale factor
    float scale = 1;
    // The rotate factor
    float rotate = 0;
    // Alpha value for controlling...