摘要： 传统作图系统主要是利用无逻辑关联的点、线、弧线等基本几何图形进行构图，这极端不符合人们的日常思维习惯。文中构造了一个面向对象的作图模型.在该模型中，通过概括和聚集建立起对象的共享属性和操作机制，并在此基础上实现了一个原型系统，整个作图过程针对图形对象，大大地提高了作图效率.并且作图环境易于扩充.

关键词: 图形类和图形对象, 图形单元, 操作单元, B样条曲线

Abstract: In traditional graphics applicatkin, drawing proedure is besed on besic geometrical graphic such as point,line aed arc etc, not appropriating our convenient thought.This thesis comtructs a object-oriented graphic model that share attribute and operational mechanism of object through generalization and aggregation, and on the basis of the model we develop a practical computer graphics system which improve graphics efficiently.The system is easy to be expanded.

中图分类号: 

• TP319