The document discusses different algorithms for drawing lines and circles on a discrete pixel grid, including approaches to reduce aliasing effects. It covers the digital differential analyzer (DDA) algorithm, Bresenham's algorithm, techniques for antialiasing such as area sampling and weighted area filtering using a conical filter. The Gupta-Sproull algorithm is highlighted as a method for antialiasing lines that calculates pixel intensities based on the distance from the line center using features of Bresenham's algorithm.