This code was written by Ian Parberry to accompany his book "Introduction to Game Physics with Box2D", published by CRC Press in 2013.

This is a simple toy that helps you get started quickly with Box2D. The next 3 chapters will drill down into Box2D more deeply, so don't be concerned if you don't fully understand all of the code here.

Each time you hit the space bar a new ball or book will fall out of the sky. Hold the space bar down for autorepeat.