JavaFX Air Hockey program

I made a Air Hockey game in JavaFX.
As for the program, named AirHockey.fx, plese refer to the code (modified to conform to JavaFX 1.0).
When you run the program, an air hockey game table with two aqua color mallets are displayed on your screen. Computer's goal (the upper one) and your goal (the lower one) are displayed in burlywood color.
Push the "SET" button to start the game. Then, a white puck appears on your side.
You can manipulate your mallet by the mouse as long as it resides in your area.
A velocity of your mallet is computed from its displacement by applying the scaling transformation. The scaling is modulated by the velocityScaling factor. You can make your mallet's velocity more real by moving the factor closer to 1.0.
You can also regulate the bounce back speed by adjusting the elastic modulus elastic.
In this program, a computer simply move its mallet back and forth. It has no ability to take the offensive. It is your business to make your opponent cool.
Enjoy yourself!