Homework #2

 - In this project you will draw lines entered by using the DDA line,
   midpoint line and OpenGL line drawing methods. Your project should
   have the following.


Requirements:

 - README.txt: From this point forward you will email your code files
   along with a README (in txt format). The readme should completely
   describe each of the fllowing in a bulleted list.
    
     - The goal of the assignment (the what)
     - The user interface / how to use your assignment (the how)
     - Any assumptions you made during implementation 
     - Any broken pieces / unfinished portions
     - Obstacles faced and overcome. Hardest part of the assignment
     - Any other features/quirks/bugs or functionality of your project
     - Fully answer any additional assignment questions


 - Keyboard Commands
   'd' - Clear and draw all lines in the system using DDA in red
   'm' - Clear and draw all lines in the system using midpoint in green
   'g' - Clear and draw all lines in the system using OpenGL in light blue
   'a' - Clear and raw all lines in the system using all methods above.
         Draw them in this order: OpenGL, DDA, midpoint. Thus if all
         three methods agree on the pixels selected for the line, only
         green will be shown at the end.
   'r' - Remove the last line from the list.
   'w' - Toggle anti-aliasing of OpenGL lines (extra credit)
   's' - start a line (from hw1)
   'e' - end a line (from hw1)
   'p' - print all lines (from hw1)

 - Mouse commands
   LEFT DOWN - start a line (from hw1)
   LEFT UP   - end a line (from hw1)


Extra Credit: 
  - Enable rubberbanding in the project. Draw the line as the left
    mouse is pressed down.
  - Provide extensive timings for each line drawing method and report
    your findings.