At nathanscomputerknowledge.com you will find java class examples any java programming lover would love. We offer class examples on a variety of useful java game programming subjects such as swing timers, hashmaps, etc. Open source for developers. One example of what we have is a class written to get an image or shape from anywhere on the screen to anywhere on the screen, called `point a to point b` or `slope`. If you are interest in 2d game programming or are already experienced, I would recommend you check it out as soon as you can. Nathan Nelson wrote most of this in 2012 when he was working on http://www.facebook.com/nathanstowerdefense.