Badler, Norman I2023-05-222023-05-221976-12-012016-01-04https://repository.upenn.edu/handle/20.500.14332/7971A simple modification of Horn's circle drawing procedure yields a disk generator for a class of graphic devices capable of drawing rectangular areas. Another variation produces a disk a scan-line at a time allowing it to be drawn at the refresh rate of the display. The calculations involve only additions and binary shifts.The final, definitive version of this article has been published in Computer Graphics and Image Processing, Vol. 6, Iss. 6, 1977, © Elseiver, which can be found online at http://dx.doi.org/10.1016/S0146-664X(77)80018-X].Computer EngineeringComputer SciencesReport