The drawback of making a change in IDE (as I did from C++ Builder to Qt Creator) is you got to find out how 'it' works: until a breakthrough, one gets stuck in the smallest detail.
This weekend, I had this breakthrough for doing 2D graphics inQt Creator 2.0. Check out my examples at
http://richelbilderbeek.nl/CppQt.htm : it even shows a simple individual-based SIR model (that is: a model in which an infectious disease spreads)! I hope you will quickly have as much fun with Qt as I have now!