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Explain general idea of midpoint algorithm

How is the midpoint algorithm implemented / decision made? Explain!

Decision variable update (E was chosen)

Decision variable update (NE was chosen)

derive initial decision variable

list equations for: d, d_{start}, d_{new}(E),d_{new}(NE) and the main advantage of the midpoint algorithm!

what do you do for slopes that are not 0<m<1?

Circle Drawing Midpoint (imlicit form of circle, d updates on E/NE chosen)

What is the problem with the midpoint algorithm?
Pixels are drawn as single line  aliasing occurs, i.e. unequal line intensity with change in angle. solution: guptasproull algoritm, antialiasing.

