I want to create a 2d game in which a car moves along the edge of an irregular shaped hill. I want to use basic as3 (no physics engine like Box2d or Nape). With a lot of research I found this thing which is exactly what i want but there is only the logic and no source code. Can someone help me with a piece of code that can do this in as3? Also suggest if there is a better alternative to get the desired output.