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The application functions as follows:

• Press one of the number keys 0-9 to activate a saucer
• All saucers are initially placed at random locations within the display window (be careful to keep them inside the window)
• You must create a HoverSaucer class, instantiate HoverSaucer objects, and call HoverSaucer methods from the main program
• Keyboard event handling should occur in the main program; translation, rotation, scaling, animation, etc. should occur in the class
• Note that only two global variables are required in the main program: an array to hold the HoverSaucers, and an int to remember which saucer is active. Any other animation globals belong inside the class
• -- The instructions below mirror the requirements from Lab 09
• UP arrow makes saucer go up
• LEFT arrow makes saucer go left
• RIGHT arrow makes saucer go right
• The saucer cannot leave the bounds of the display window in any direction
• Gravity is always pulling the saucer down. Only UP arrow can make it ascend
• The saucer will continue being pulled down by gravity even if LEFT or RIGHT arrow keys are held down
• When ascending, the saucer's propellers should spin fast clockwise
• When descending, the saucer's propellers should slowly spin counter clockwise
• The propellers should not spin at all when the craft is on the ground
• All objects should be created with their center at (0,0) and then translated to where they belong