对计算机图形学的编程实践，包括画直线、反走样直线、画圆、画椭圆、画矩形、画多边形、矩形填充、多边形填充、3D变换、光照、贴图等。由于精力有限，未对原码做任何注释。出于简化编程的考虑，许多地方指定了常数，未做通用处理-of computer graphics programming practice, including painting line, anti-aliasing straight Circle, painted oval, rectangular painting, drawing