要研究的算法主要有DDA算法、Bresenham算法、对称算法、两步算法、及四步算法，此外还对自适应多步位移码画线算法进行了一定研究。其中，DDA、Bresenham算法都是单步画线算法，其它是多步画线算法。

-To study the algorithm mainly DDA algorithm, Bresenham algorithm, symmetric algorithm, two-step algorithm, and four-step algorithm, in addition to displacement of adaptive multi-step line drawing algorithm code some research. In which, DDA, Bresenham algorithm for drawing a line are single-step algorithm, the other is a multi-step algorithm for drawing lines.