Graphics exercise (b.tech)
Download as PPTX, PDF0 likes57 views
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) before repeating until x is greater than or equal to y.
1 of 40
Download to read offline
Graphics exercise (b.tech)
- 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.