The Existing Problem and Solution for Arithmetic of Scan-Line Filling
Lifang Tong · Journal of Northeast Dianli University · 2006
There is a obvious defect in scan-line filling arithmetic.This method can not be used for the polygons which have one or more CQX vertices.A solution for this question is finding out the CQX vertices and deleting their edges in the Active Edge List(AEL).The improvement of scan-line method will make it passable that all kinds of polygons can be filled correctly by this algorithm.