| 1. | The main contributions are summarized as follows : 1 . on reading information from engineering drawing , dxf file format and storing structure is researched , and interface procedure to read primitive data from dxf under cad system is also designed and programmed 主要内容包括: 1 .在读取工程图信息方面,深入研究和分析了dxf工程图的文件格式和存储结构,设计并编写了读取dxf文件各类图元信息的接口程序。 |