实现二维基本图元直线段生成的基本算法（DDA，中点法，Bresenham）实现二维基本图元圆弧/椭圆圆弧生成的基本算法（中点法）实现对线型线宽的属性的控制实现二维多边形扫描转换的扫描线算法实现二维多边形扫描转换的边缘填充算法或栅栏填充算法实现二维连通区域填充的扫描线种子填充算法（四连通或八连通）实现二维直线段裁剪的Cohen-Sutherland裁剪算法和中点分割裁剪算法-basic 2D linear map of the yuan generated by the basic algorithm (DDA, the midpoint method, Bresenham) basic 2D map yuan Arc / elliptical arc generated by the basic algorithm (midpoint) to achieve linear linewidth control of the attributes of 2D polygon scan conversion algorithm scanning 2D polygon scan conversion Edge geo-filling algorithm fence or filling algorithm regional connectivity filled two-dimensional scanning lines seed filling algorithm (four or eight connectivity connectivity ) 2D linear cut of the Cohen-Sutherland cutting midpoint segmentation algorithm and cutting algorithm