型交互式图形系统，由Turbo C2.0编写，实现了计算机图形学中的多边形裁减；多边形旋转，平移，缩放；Bezier曲线；B样条曲线；中点圆-Type of interactive graphics systems, prepared by the Turbo C2.0 to achieve reduction of polygons in computer graphics polygon rotation, translation, scaling Bezier curve B-spl