With the development of computer and graphics technology

the cockpit instruments have brought about a great challenge to the quality of the graphics. As hardware system using grating graphics display system

there are saw tooth-shaped distortion in compass screen when it rotates owing to the restrictions of the grating scan display. Based on this problem

by analyzing the causes of the aliasing

using a method of arithmetic of Bresenham to get rid of it

the effect of anti-aliasing has been proved obviously. With the application of the symmetry of line and circularity

the speed of the generation of a whole compass screen is highly advanced.