掌握计算机图形学中各种常见图形的各种算法及其实现。特别要求直线，二次曲线，自由曲线，区域填充，二维图形裁剪，图形几何变换，自由曲面-To master a variety of computer graphics, a variety of common graphics algorithms and its implementation. Special request line, quadratic curve, free curve, area filling, cutting two-d