What are the correct answers to computer graphics questions?

Question

Algorithms

1) The circle construction algorithm using the midpoint calculates all points of the circle ?
2) Why is the ellipse construction algorithm (midpoint algorithm) divided into two parts? Is it possible to use one whole part, as in the construction of a circle?
Where can I read in a simple / understandable way about computer graphics algorithms (maybe there are decent youtube channels), everything I find on the Internet is written in a very heavy language.

Answer 1

grafika.me/node/27 is one of the first sources on Google. If it seems complicated to you, just try to understand the main principle, it's in this paragraph, everything else is mathematical logic around it:

When generating a circle clockwise after entering the point (Xi, Yi), the next point can be (see Fig. 0.1a) either Pg = (Xi + 1, Yi) - horizontal movement, or Pd = (Xi + 1, Yi -1) - diagonal movement, or Pv = (Xi, Yi-1) - vertical movement.