Autolisp在南方CASS中批量处理图形数据中的应用.doc

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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.GivenalittleknowledgeyoucanintegrateexistingAutolisproutinesintoyourown

2、andgaintremendouspoweroveryourAutoCADbasedinstallation.ThefirstthingtounderstandisthatAutolisphasacoupleofkeyfilesandakeyfunctionthatperformstartupoperationsforyou.ThekeyfilesarecalledACAD.LSPandACADDOC.LSPandthekeyfunctioniscalledS::STARTUPandtheiroperationsare

3、assummarizedhere:ACAD.LSP–ThisfileloadswhenAutoCADstartsup.AnyprogrammingyouplacewithinthisfilewillbeautomaticallyloadedeverytimeAutoCADstarts.TheACAD.LSPfileisnormallylocatedintheSUPPORTsubdirectoryoftheAutoCADinstallation.ACADDOC.LSP–Thisfileloadseverytimeanew

4、drawingsessionisstartedinAutoCAD2000,2000ior2002basedproducts.Thereforeanyprogrammingyouplaceinthisfilewillbeloadedautomaticallyeverytimeadrawingisopenedorstarted.NotethatwhiletheACAD.LSPfilewouldloadintheFIRSTdrawingoftheAutoCAD2000typeproductsonlytheACADDOC.LS

5、Pfilewillloadwithsubsequentdrawings.SinceAutoCADR14doesn’tsupportmultipledrawingsessionsyouwon’thavetoworryabouttheACADDOC.LSPfilewithR14.LiketheACAD.LSPfile,ACADDOC.LSPisnormallylocatedintheSUPPORTsubdirectoryoftheAutoCADinstallation.S::STARTUPfunction–Thisfunc

6、tionistypicallywithintheACADDOC.LSPfile(orACAD.LSPfileforAutoCADR14installations)anditssolejobistoexecutecustomizedcommandsyouneedtoinitializeyournewdrawingenvironment.ThisfunctionistheperfectplacetosetsystemvariableslikeDIMSCALE,VIEWRESparameters,currentlayers,

7、etc.ThemostpowerfulaspectoftheS::STARTUPfunctionisthatitinvokesautomaticallyanditletsyoucontrolexactlyhowtheAutoCADenvironmentisinitialized.SimpleExamplesIfyoucreatedanACADDOC.LSPfileintheSUPPORTsubdirectoryofyourAutoCADinstallationandplacedthefollowingtextinitw

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