Book Image

XNA 4.0 Game Development by Example: Beginner's Guide - Visual Basic Edition

By : Kurt Jaegers
Book Image

XNA 4.0 Game Development by Example: Beginner's Guide - Visual Basic Edition

By: Kurt Jaegers

Overview of this book

XNA Game Studio enables hobbyists and independent game developers to easily create video games, and now gives that power to Visual Basic developers. XNA lets you bring your creations to life on Windows, the Xbox 360 and the Windows Phone platforms. The latest release of XNA has added support to Visual Basic and therefore, Visual Basic developers now have the power to give life to their creativity with XNA.This book covers both the concepts and the implementations necessary to get you started on bringing your own creations to life with XNA. It presents four different games, including a puzzler, space shooter, multi-axis shoot 'em up, and a jump-and-run platformer. Each game introduces new concepts and techniques to build a solid foundation for your own ideas and creativity.This book details the creation of four games, all in different styles, from start to finish using Visual Basic and the Microsoft XNA framework. Beginning with the basics of drawing images to the screen, the book then incrementally introduces sprite animation, particles, sound effects, tile-based maps, and path finding. It then explores combining XNA with Windows Forms to build an interactive map editor, and builds a platform-style game using the editor-generated maps. Finally, the book covers the considerations necessary for deploying your games to the Xbox 360 platform.By the end of the book, you will have a solid foundation of game development concepts and techniques as well as working sample games to extend and innovate upon. You will have the knowledge necessary to create games that you can complete without an army of fellow game developers at your back.
Table of Contents (16 chapters)
XNA 4.0 Game Development by Example – Visual Basic Edition Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
4
Asteroid Belt Assault – Lost in Space
Index

Time for action – creating a new Windows game project


  1. In the Visual Studio window, open the File menu and select New Project...

  2. Under Project Type, make sure Visual Basic is selected as the language and that the XNA Game Studio 4.0 category is selected.

  3. Under Templates, select Windows Game (4.0).

  4. Name the project SquareChase (this will automatically update the Solution Name).

  5. Click on OK.

What just happened?

Each of the XNA project templates is a series of files and settings that get copied to your new project folder. Included in this set of files is the Game1.vb file, which is the heart of your XNA game.

Tip

Back up your projects

When you create your project, the Location field specifies where it will be saved. By default, Visual Studio creates a folder in your user documents area called Visual Studio 2010 to store both programs and configuration information. Under this folder is a Projects folder that contains subfolders for each new project you create. Make backups of your projects on a regular basis. You do not want to lose your hard work to a disk failure!

Anatomy of an XNA game

The most basic XNA game will have all of its code contained in the file called Game1.vb. This file is generated when you create a new project and contains override declarations for the methods used to manage your game. In addition to the Game1 class' declarations area, there are five primary methods that you will customize for any XNA project.

The declarations area

Right below the class declaration for Game1 is the class level declarations area. By default, this area contains two variables:

Private WithEvents graphics As GraphicsDeviceManager
Private WithEvents spriteBatch As SpriteBatch

The graphics object provides access to, not surprisingly, the system's video card. It can be used to alter the video mode, the size of the current viewport (the area that all drawing work will be clipped to if specified), and retrieve information about Shader Models the video card supports.

XNA provides the SpriteBatch class to allow you to (very quickly) draw 2D images (called sprites) to the screen. The spriteBatch variable is an instance of this class, which we will use for all of our drawing purposes in SquareChase.

The declarations area is the spot for any variables that need to be maintained outside of any of the individual methods discussed next, such as LoadContent, Update, and Draw. In practice, any data that you need to keep track of throughout your game will be referenced in some way in your declarations section.