Auto lisp在南方CASS中批量处理图形数据中的应用毕业论文.doc

本科毕业论文(设计)应用Auto lisp在南方CASS中批量处理图形数据 HYPERLINK /archives/6 \o Permanent Link: AutoLisp Examples AutoLisp ExamplesAuto lisp BasicsAuto lisp is the grand daddy of Auto CAD programming tools and you’d be amazed at the amount of Auto lisp programming tools you can find on the Internet. Given a little knowledge you can integrate existing Auto lisp routines into your own and gain tremendous power over your AutoCAD based installation.The first thing to understand is that Auto lisp has a couple of key files and a key function that perform startup operations for you. The key files are called ACAD.LSP and ACADDOC.LSP and the key function is called S::STARTUP and their operations are as summarized here:ACAD.LSP – This file loads when AutoCAD starts up. Any programming you place within this file will be automatically loaded every time AutoCAD starts. The ACAD.LSP file is normally located in the SUPPORT subdirectory of the AutoCAD installation.ACADDOC.LSP – This file loads every time a new drawing session is started in AutoCAD 2000, 2000i or 2002 based products. Therefore any programming you place in this file will be loaded automatically every time a drawing is opened or started. Note that while the ACAD.LSP file would load in the FIRST drawing of the AutoCAD 2000 type products only the ACADDOC.LSP file will load with subsequent drawings. Since AutoCAD R14 doesn’t support multiple drawing sessions you won’t have to worry about the ACADDOC.LSP file with R14. Like the ACAD.LSP file, ACADDOC.LSP is normally located in the SUPPORT subdirectory of the AutoCAD installation.S::STARTUP function – This function is typically within the ACADDOC.LSP file (or ACAD.LSP file for AutoCAD R14 installations) and its sole job is to execute customized commands you need to initialize your new drawing environment. This function is the perfect place to set system variables like DIMSCALE, VIEWRES parameters, current layers, etc. The most powerful aspect of the S::STARTUP function is that it invokes