This document describes the algorithm for drawing a circle by determining pixel positions. It explains that if the midpoint calculation is inside the circle, the pixel on the current scan line is used, otherwise the pixel on the previous scan line is used. It then states that symmetry points are determined in the other octants and each pixel position is moved to the circular path centered at (xc, yc) by adding those coordinates before repeating until x is greater than or equal to y.

1. TOPIC :
Question of Ch -3(FOLEY)

3. • If pk < 0, this midpoint is inside the
circle and the pixel on scan line yk is
closer to the circle boundary.
• Otherwise, the midposition is outside or
on the circle boundary,and we select the
pixel on scanline yk – 1.

4. 4.Determine symmetry points in the other seven
octants.
5. Move each calculated pixel position (x, y) onto
the circular path centered on (x, yc) and plot the
coordinate values:
x=x+xc, y=y+yc
6. Repeat steps 3 through 5 until x >= y.