图形文件几何参数的抽取技术

The Extraction of Geometrical Parameters from Graphics Files

阐述了从图形文件抽取几何参数的技术，即把复杂的内部图形文件转换成外部可读的通用文件．通过对通用文件的结构分析，找出其内在的规律，然后用高级语言进行抽取和加工，将用户所需的几何参数写人数据文件，提供给用户读写，从而达到对图形数据管理的目标．

Discusses ways of implementaion in extracting egometrical parameters from graphics files in engineering databases management systems of CAD applications systems. Comple x interal graphics files are transfered into external universal files that are readable.The paper analyses the structure of the universal files and gives rules of parameter arrangement in the files.The necessary geometric parametrs are extracted from the files into ordinary data files using genceral programming languages, so that users can easily access thes ordinary data files and the graphics data management is improved.