【摘要】 在有线电视的光缆传输系统的规划过程中,需要对各种信号和参数进行测算和调节。借助计算机辅助软件,将会很方便地实现规划方案。所介绍的有线电视图形元件库软件,即是这种辅助软件的基础。提出了开发带函数和参数的元件库的构思,将元件定义为具有图形、文字、函数和参数4种元素的类。首先给出了软件的设计框架和基本类定义,然后重点讨论了软件的关键技术的实现,探讨实现用户自定义和编辑元件图形的方法,并介绍了一种元件库文件的保存格式和转换途径。最后,对软件做出评价。更多还原

【Abstract】 In planning the optical-fiber transmitting system for CATV,it is needed to calculate and modulate all kinds of signals and parameters.It is convenient to realize the planning scheme by computer-aided software.The CATV graphical components library,which this paper introduces,is just the base of the aided software.The paper puts forward a conception of components library with functions and parameters,in which the component is defined as a class comprising four elements:graph,text,function,parameter.In this paper,the design frame and base-class definition are given.Then,the paper emphasizes the implementation of key techniques of sofeware,and dicusses the method to implement user Self-defined and editing graph.A save format and a conversion mothod of components library files are introduced.At last,the evaluate of the software is given.更多还原