After studying in depth the recent algorithms for graphics clipping, we found that the recent algorithms can only be used for simple graphics ( such as straight line) clipping and not for complicated graphics ( such as curve and irregular graphics). 通过对现有的图形裁剪算法进行深入的研究后,认为现有的图形裁剪算法只能单纯的对简单的图形元素(如直线)进行裁剪,对复杂图形(如自由曲线、不规则图形)则不适用。