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

Chapter 4. Applying Forces to Bodies

Box2D world is ruled by forces and is able to apply them to bodies to give us a realistic simulation, but if you couldn't manually apply forces to bodies, you won't be able to move bodies, fire bullets, throw birds, drive cars, and do all the awesome things you see when you play physics games.

In this chapter you will learn how to apply forces to move bodies in different ways, managing a lot of new Box2D features including:

  • Applying a force to a body

  • Applying an impulse to a body

  • Setting the linear velocity to a body

  • Knowing the mass of a body

  • Applying the right kind of force according to your gameplay needs

  • Mixing physics with non-physics assets in your game

By the end of the chapter, you will be able to create an Angry Birds level, sling included.