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.
Bear in mind that the size of the configurations you'll encounter can be unbounded. In other words you could require a very large area to draw on. You might want to provide scrolling, rather than trying to scale extremely large displays into a component of fixed size.