We will use the Separating Axis theorem to deduce whether two convex polygons are overlapping or not and implement the desired algorithm in both C and Lua.

http://www.phailed.me/2011/02/polygonal-collision-detection/#desc

This article is written for people with no prior experience with game development or physics/linear algebra. A little bit of programming experience is assumed, but you don't have to be a programming god to understand what I'm talking about.

If you've ever wondered about how computers can create seemingly random sequences of numbers (lua's math.random() function comes to mind), wonder no more.

http://www.phailed.me/2011/02/pseudorandomness-1/#desc

Now with 100% more snowmen and drunk humor (it was kinda funny..)