auto lisp在南方cass中批量处理图形数据中的应用毕业论文

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1、本科毕业论文(设计)应用Autolisp在南方CASS中批量处理图形数据AutoLispExamplesAutolispBasicsAutolispisthegranddaddyofAutoCADprogrammingtoolsandyou’dbeamazedattheamountofAutolispprogrammingtoolsyoucanfindontheInternet.GivenalittleknowledgeyoucanintegrateexistingAutolisproutinesintoy

2、ourownandgaintremendouspoweroveryourAutoCADbasedinstallation.ThefirstthingtounderstandisthatAutolisphasacoupleofkeyfilesandakeyfunctionthatperformstartupoperationsforyou.ThekeyfilesarecalledACAD.LSPandACADDOC.LSPandthekeyfunctioniscalledS::STARTUPandtheiro

3、perationsareassummarizedhere:ACAD.LSP–ThisfileloadswhenAutoCADstartsup.AnyprogrammingyouplacewithinthisfilewillbeautomaticallyloadedeverytimeAutoCADstarts.TheACAD.LSPfileisnormallylocatedintheSUPPORTsubdirectoryoftheAutoCADinstallation.ACADDOC.LSP–Thisfile

4、loadseverytimeanewdrawingsessionisstartedinAutoCAD2000,2000ior2002basedproducts.Thereforeanyprogrammingyouplaceinthisfilewillbeloadedautomaticallyeverytimeadrawingisopenedorstarted.NotethatwhiletheACAD.LSPfilewouldloadintheFIRSTdrawingoftheAutoCAD2000typep

5、roductsonlytheACADDOC.LSPfilewillloadwithsubsequentdrawings.SinceAutoCADR14doesn’tsupportmultipledrawingsessionsyouwon’thavetoworryabouttheACADDOC.LSPfilewithR14.LiketheACAD.LSPfile,ACADDOC.LSPisnormallylocatedintheSUPPORTsubdirectoryoftheAutoCADinstallati

6、on.S::STARTUPfunction–ThisfunctionistypicallywithintheACADDOC.LSPfile(orACAD.LSPfileforAutoCADR14installations)anditssolejobistoexecutecustomizedcommandsyouneedtoinitializeyournewdrawingenvironment.ThisfunctionistheperfectplacetosetsystemvariableslikeDIMSC

7、ALE,VIEWRESparameters,currentlayers,etc.ThemostpowerfulaspectoftheS::STARTUPfunctionisthatitinvokesautomaticallyanditletsyoucontrolexactlyhowtheAutoCADenvironmentisinitialized.SimpleExamplesIfyoucreatedanACADDOC.LSPfileintheSUPPORTsubdirectoryofyourAutoCAD

8、installationandplacedthefollowingtextinitwhatdoyouthinkwouldhappen?Well,theDEFUNstatementsimplyDEfinesaFUNction(seewheretheDEFUNcomesfrom)calledS::STARTUPwhichwealreadyknowwillruneverytimeAutoCADstarts/opensa