1 完成SH_Poly_Clip多边性裁减算法。 2 对裁减后的封闭区域进行填充。 3 将填充算法和直线段扫描转换算法封装成接口函数。 -1 completed SH_Poly_Clip multilateral reduction algorithm. After the two pairs of reduction of the closed area filled. 3 will be filled with algorithms and line segments into