Book Image

Box2D for Flash Games

Book Image

Box2D for Flash Games

Overview of this book

Physics games are getting more and more popular, and Box2D is the best choice if you are looking for a free, stable and robust library to handle physics. With Box2D you can create every kind of 2D physics game, only coding is not the fun part, but the game itself. "Box2D for Flash Games" will guide you through the process of making a Flash physics game starting from the bare bones and taking you by hand through complex features such as forces, joints and motors. As you are learning, your game will have more and more features, like the physics games you are used to playing. The book analyzes two of the most played physics games, and breaks them down to allow readers to build them from scratch in a step-by-step approach. By the end of the book, you will learn how to create basic primitive bodies as well as complex, compound bodies. Motors will give life to cars, catapults and siege machines firing bullets, while a complete collision management will make your game look even more realistic. If you want to make full Flash games with physics, then Box2D for Flash Games will guide you through the entire process of making a Flash physics game.
Table of Contents (15 chapters)
Box2D for Flash Games
About the Author
About the Reviewers

Hello Box2D World

Box2D is free and open source, so you won't need to install components or deal with SWC files. All you need to do to include it in your projects is to include the required classes.

Open and write the following code snippet:

package  {
  import flash.display.Sprite
  import Box2D.Dynamics.*;
  import Box2D.Collision.*;
  import Box2D.Collision.Shapes.*;
  import Box2D.Common.Math.*;
  public class Main extends Sprite {
    public function Main() {
      trace("my awesome game starts here");

Test the movie and you should see my awesome game starts here in your Output window. This means you have successfully imported the required classes.

There isn't that much to say about the code we just wrote, as we are just importing the classes needed to make our Box2D project work.

When I gave the Hello Box2D World title, I did not mean to create just another "Hello World" section, but I wanted to introduce the environment where all Box2D simulation and events take place: the world.

The world is the stage where the simulation happens. Everything you want to be ruled by the Box2D physics must be inside the world. Luckily, the Box2D World is always big enough to contain everything you need, so you don't have to worry about world boundaries. Just remember everything on a computer has limits in one way or another. So, the bigger the world, the heavier will be the work for your computer to manage it.