Box2d源码学习
随着智能手机的大量普及，手机的性能也越来越好，伴随而来出现大量的手机游戏 ，其中不乏很多优秀的游戏，如《愤怒的小鸟》、《鳄鱼小玩皮》、《翼飞冲天》等等。同时它们也大量的模拟了现实生活中的相关东西，比如小鸟飞行、碰撞的模拟，流体的模拟，都用到了相关的物理知识，他们的开发团队是怎么做到的呢，我们不得而知，但我们可以通过box2d引擎来实现相应的效果。下面我们就来了解并学习下box2d。
Build a simple 2D physics engine for JavaScript games
Sometimes, the complexity and overhead of a third-party physics library, such as Box2D, is overkill for your JavaScript game. In this article, walk through an implementation of a straightforward 2D physics engine. Learn to create a simple physics world with gravity and collision detection between game objects. This article discusses the structure of a physics engine, some algorithms to detect and resolve collisions, and the reasons to “roll your own” physics engine.