大多数实际测试是逐行进行的。通常我们使用扫描线，每个扫描线对应于帧缓冲

Most actual tests are performed line by line. Usually we use scan lines, and each scan line corresponds to a row of pixels in the frame buffer. If we calculate the intersections where a line crosses the sides of the polygon, these intersections can be sorted. The first intersection starts at a set of points within the polygon. The second intersection leaves the polygon, the third intersection re-enters, and so on.

Most actual tests are performed line by line. Usually we use scan lines, each corresponding to a row of pixels in the frame buffer. If we calculate the intersections of a line passing through the edges of a polygon, these intersections can be sorted. The first intersection begins with a set of points within the polygon. The second intersection leaves the polygon, the third intersection re enters, and so on.<br>

Most actual tests are done line by line. Generally, we use scan lines, and each scan line corresponds to a row of pixels in the frame buffer. If we calculate the intersections where a line passes through the edges of a polygon, these intersections can be sorted. The first intersection begins with a set of points within a polygon. The second intersection leaves the polygon, the third intersection reenters, and so on.