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1、辽宁石油化工大学机械工程学院计算机绘图双语教学讲义No13TangXiaochuLiJingChapter10UsingBlockandExternalReferences10.1OverviewAutoCADprovidesseveralfeaturestohelpyoumanageobjectsinyourdrawings.Withblocksyoucanorganizeandmanipulatemanyobjectsasonecomponent.Youcanalsoassociateitemso
2、finformationwiththeblocksinyourdrawings-forexample,partnumbersandprices-byattachingattributes.Specificationsheetsorbillsofmaterialscanbecreatedusingthisinformation.YoucanattachoroverlayentiredrawingsinyourcurrentdrawingbyusingAutoCADexternalreferences,o
3、rxrefs.Whenyouopenadrawingthatcontainsxrefs,anychangesthathavebeenmadeinthereferenceddrawingappearinthecurrentdrawing.10.2WorkingwithBlocksAblockisacollectionofobjectsyoucanassociatetogethertoformasingleobject,orblockdefinition.Youcaninsert,scale,androt
4、ateablockinadrawing.Youcanexplodeablockintoitscomponentobjects,modifythem,andredefinetheblock.AutoCADupdatesallcurrentandfutureinstancesofthatblockbasedontheblockdefinition.Blocksstreamlinethedrawingprocess.Forexample,youcanuseblockstoBuildastandardlibr
5、aryoffrequentlyusedsymbols,components,orstandardparts.Youcaninsertthesameblocknumeroustimesinsteadofre-creatingthedrawingelementseachtime.Revisedrawingsefficientlybyinserting,relocating,andcopyingblocksascomponentsratherthanindividualgeometricobjects.Sa
6、vediskspacebystoringallreferencestothesameblockasoneblockdefinitioninthedrawingdatabase.Forinformationabouthowtocreateablock,see"DefiningBlocks."Whenyouinsertablockinyourdrawing,youarecreatingablockinstance.Eachtimeyouinsertablockinstance,youassignascal
7、efactorandrotationangletotheinsertedblock.Youcanalsoscaleablockinstanceusingdifferentvaluesinanycoordinate(X,Y,Z)direction.Blocksmakeitpossibleforyoutoorganizeyourdrawingtasksinasystematicway,sothatyoucansetup,redesign,andsorttheobjectsinyourdrawingsand
8、theinformationassociatedwiththem.DefiningBlocks辽宁石油化工大学机械工程学院计算机绘图双语教学讲义No13TangXiaochuLiJingYoucangroupobjectstocreateblockdefinitionsinthecurrentdrawing,oryoucansavetheblockasaseparatedrawingfile.Whenyoudefineablock,youspecifyt
