bresenham_circle => code by CHANDAN KUMAR modified to work as a function, returning X and Y coordinates of circle point with zero origin
bresenham_circle2 => algorithm from Wikipedia (http://en.wikipedia.org/wiki/Midpoint_circle_algorithm)
midpoint_circle => midpoint algorithm from http://groups.csail.mit.edu/graphics/classes/6.837/F98/Lecture6/circle.html
circle_test => explains why i had to look for the third algorithm, and the first two were not good enough :)
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