基本图形学图元生成，实现图形学经典图元直线，样条，多边形填充，裁剪等算法。-basic map generated graphics, graphics achieve classic map line, spline, polygon filling, cutting algorithm.

基本图形学图元生成，实现图形学经典图元直线，样条，多边形填充，裁剪等算法。-basic map generated graphics, graphics achieve classic map line, spline, polygon filling, cutting algorithm.