半挂车图库的设计

Design of Galleries of Semi-trailers

半挂车图库是半挂车CAD应用系统的重要组成部分。针对半挂车因库应有的功能，较详细地阐述了半挂车图库的组成和结构层次，各个模块的设计及数据库系统的设计，提出了结构模块化、数据独立化、图元参数化、资源开放化及界面友好化等一系列设计思想。

A gallery of semi-trailers is regarded as a very important comp0siting part of CAD applica-tion system of semlwtailers. In the paper,considering the behavior which the gallery of semi-tailers shouldhave,the authors expound in detail the compositi0n and structure arrangment,the design 0f each moduleand the design of database system,and put forward a serles of deslgn ldeas of modularled structure,inde-pendent data,parameter primitives,exoteric resources and friendly interfaces.