图形对象拾取技术在开发CAD系统中的应用

摘要

在绘图系统中，经常要对图形对象进行平移、旋转、缩放、镜像、错切、投影等诸多变换．在交互式环境中，这些变换又必须建立在对各种图形对象的拾取基础上．对图形对象的拾取技术进行了一些探讨．%In drawing system, objects are always transformed, such as moving, rotation, scaling, mirror, projection, and so on. In an interactive environment, those transformations are often established on the basis of the pickup on a variety of graphic objects. So, this paper discusses the technology of picking up graphic objects.