全罗盘画面反走样算法的研究和实现

在一定分辨率的屏幕上，用常规画线函数生成的静态罗盘刻度线呈现出锯齿形失真，特别当罗盘作动态旋转时，刻度线扭曲，变形，为消除这一现象，笔者根据线条的反走样原理，提出了一种实用算法，消除了静态的锯齿形失真，并从CRT屏幕上仿真的动态效果来看，罗盘刻度线旋转时不扭曲，不变形，实验证明，在光栅图形显示器中，应用此算法可消除走样，大大增强罗盘刻度线动态显示效果。

Realization of Eliminating Distortion and Twist of Scale Lines in Compass

In the screen with limited resolution,scale lines in compass drawn with the general line function tend to be distorted,especially when rotating. In order to eliminate this phenomena,a algorithm based on the antialiasing principle is put forward. When applying it to draw scale lines,the distortion is disappear. In the meantime,the dynamic twist appeared in the deflection of the compass is more improved. Experimental results prove that the algorithm is an effective method to remove distortion and twist of the scale lines in compass whatever in static or dynamic states.