This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
i wrote a similar program in c++ last year... it was supposed to display a regular clock with an hour hand and a minute hand. i will have to send the code when i get home tonight, but here is the idea: first draw the circle and then draw a line from the center point to a point on the circumference of the circle. i cannot remember the exact formula at the moment, but it has something to do with the (pi * radius ^2) formula. if you do not have an answer by the time i get home then i will send you that part of my code.