该程序实现了图形学中的一些算法，如画线、画圆，填充、直线多边形、扫描转换，扫描线消隐算法以及一个简单的Gouraud光照模型。-the realization of a number of graphics algorithms, painting lines, the Circle, filling, linear polygon scan conversion, Lines scanning algorithm and a simple scan illumination model.