Number Models 2
Progress bar, dot that follows a line.
	note
Please read Sections 8.1-8.4 in the book!- 
Make a progress bar that shrinks in half every time a key is hit.       
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Make a dot that moves along a line from (50,0) to (250,300). 
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Exercise 8.4.4 from the text. Be sure to follow the design process!