Development of Topographic Maps Symbols Library Based on AutoLISP language

摘要

Visual LISP language is favored by many people for its simple and practical.Because of most CAD teaching materials centre on introducing concrete languages'use and single symbol making,lack of a comprehensive description of the whole process of developing professional symbols library,it is very difficult for People having mastery of LISP languages to developing professional symbol library by this language.In this article,the authors develop a symbols library for common Topographic Maps and design an environment to transfer and input the symbols with the aid of Visual LISP language,including defining graphic coordinates systems,coordinates transformations,putting library files in order,calling user-defined file etc.This paper provides great help for people who Devote oneself to map symbol library system development.