At 7:33 PM +1300 12-03-03, Russell McMahon wrote:
>Why not ask him.
>He's very approachable.



I'm too late. I sent him my question and got back this reply:

>My retirement is 15 May 2003.  I'll check my Winthrop e-mail just
>before I lock the door and turn out the lights on the 15_th.
>Best regards,                         Ciao, Jack



But think about my simplified case for linear interpolation. It makes
sense. It's merely dividing the major axis by the minor axis by
repetitive subtraction. I don't see the point in calculating and
storing Bresenham's (2 * deltay) and (deltax - deltay).

   x = x + 1;
   d = d - deltay;
   if (d < 0)
        {d = d + deltax;
        y = y  + 1;
        }


An interesting bit of trivia:
Bresenham invented the linear algorithm in 1965. He didn't come up
with the circular algorithm until 12 years later.
http://www.cs.wpi.edu/~matt/courses/cs563/talks/history.html

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