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本讲主要叙述当前国内图形支撑软件的两种基本方式及各具有的特色;MTCCAD绘图系统的图形支撑软件CHGS的特点;图形支撑软件的基本功能;实现这些功能的程序组织,给出关键性的源程序段,供用户开发新的绘图系统时参考。一、图形支撑软件发展概况图形是表达设计原始资料、计算分析结果以及设计思想和设计意图的强有力的工具。图形和数据之间存在着对应的关系,通过图形支撑系统把数字化了的信息通过计算机的存储和处理,输出到显示器、绘图机等
This lecture mainly describes the two basic methods and features of the current domestic graphic support software; the features of the graphic support software CHGS of the MTC CAD drawing system; the basic functions of the graphic support software; the program organization to implement these functions, giving the key Source program segment, for users to refer to when developing a new drawing system. First, the development of graphic support software The graphic is a powerful tool for expressing original design data, calculating analytical results, and designing ideas and design intent. There is a corresponding relationship between graphics and data. Through the graphics support system, the digitized information is stored and processed by the computer and output to displays, plotters, etc.