This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I am unaware of your requirements. I am not sure if you are looking for an even distrubution of the values, or a circle with "slices" representing values. First I just added a drawcircle method, which I first envoked, so I could focus on the slices (see code addition). I then removed the calculations from the setAngle Method (again, see code modification). Code needs cleaning. Hope it helps.