If you look at all this logically it is all really very simple. Everything you want to know is there in the Qt Assistant. I think it is one of the best docuement ever written.

You can download this Qt3 book and the all major concepts of drawing could still be applied for Qt4. Also, if you want you can buy this Qt4 book.

You can also look into Qt Quarterly for reference.

By the way, I think Trolls are better than M$ programmers.