Flash动画外文文献word版本.docx

Flash动画外文文献word版本.docx

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Flash动画外文文献word版本

Flash动画外文文献

Flashanimation

Inthemodernteaching,thetraditionalteachinghasalreadycannotsatisfytherequirementofmodernteaching,theteachingwayandteachersetcareputforwardhigherrequest,sofortheFlashanimationcoursewaredevelopmenthasaveryimportantsignificance.Flashcannotonlymakethelearnerstodeepentheunderstandingoftheknowledge,improvethelearninginterestofthestudentsandteachers'teachingefficiency,alsocanaddvividartisticeffectcourseware,conducetotheacademicknowledgeexpressionandcommunication.Inordertoprovidestudentswithintuitiveexperimentalprocess,improvetheirlearningefficiencyandflashanimationintheteachingapplicationisnecessary.Thispapertomakeproteinsdialysisanimationasanexample,introducedsimplyhavestrongabilityanduniqueinteractiveFlash8.0,discusseshowtousetheFlash8.0makeproteindialysisexperimentalanimationwholeprocessandrelatedmatters.

WhatisFlash

Flashisanauthoringtoolthatletsdesignersanddeveloperscreatepresentations,applications,andothercontentthatenablesuserinteraction.Flashprojectscanincludesimpleanimations,videocontent,complexpresentations,applications,andeverythinginbetween.Ingeneral,individualpiecesofcontentmadewithFlasharecalledapplications,eventhoughtheymightonlybeabasicanimation.Youcanmakemedia-richFlashapplicationsbyincludingpictures,sound,video,andspecialeffects.

FlashisextremelywellsuitedtocreatingcontentfordeliveryovertheInternetbecauseitsfilesareverysmall.Flashachievesthisthroughitsextensiveuseofvectorgraphics.Vectorgraphicsrequiresignificantlylessmemoryandstoragespacethanbitmapgraphicsbecausetheyarerepresentedbymathematicalformulasinsteadoflargedatasets.Bitmapgraphicsarelargerbecauseeachindividualpixelintheimagerequiresaseparatepieceofdatatorepresentit.

TobuildanapplicationinFlash,youcreategraphicswiththeFlashdrawingtoolsandimportadditionalmediaelementsintoyourFlashdocument.Next,youdefinehowandwhenyouwanttouseeachofthoseelementstocreatetheapplicationyouhaveinmind.

WhenyouauthorcontentinFlash,youworkinaFlashdocumentfile.Flashdocumentshavethefileextension.fla.AFlashdocumenthasfourmainparts:

TheStageiswhereyourgraphics,video,buttons,andsoonappearduringplayback.

TheTimelineiswhereyoutellFlashwhenyouwantthegraphicsandotherelementsofyourprojecttoappear.YoualsousetheTimelinetospecifythelayeringorderofgraphicsontheStage.Graphicsinhigherlayersappearontopofgraphicsinlowerlayers.

TheLibrarypaneliswhereFlashdisplaysalistofthemediaelementsinyourFlashdocument.

ActionScriptcodeallowsyoutoaddinteractivitytothemediaelementsinyourdocument.Forexample,youcanaddcodethatcausesabuttontodisplayanewimagewhentheuserclicksit.YoucanalsouseActionScripttoaddlogictoyourapplications.Logicenablesyourapplicationtobehaveindifferentwaysdependingontheuser’sactionsorotherconditions.FlashincludestwoversionsofActionScript,eachsuitedtoanauthor’sspecificneeds.FormoreinformationaboutwritingActionScript,seeLearningActionScript2.0inFlashintheHelppanel.

Flashincludesmanyfeaturesthatmakeitpowerfulbuteasytouse,suchasprebuiltdrag-and-dropuserinterfacecomponents,built-inbehaviorsthatletyoueasilyaddActionScripttoyourdocument,andspecialeffectsthatyoucanaddtomediaobjects.

WhenyouhavefinishedauthoringyourFlashdocument,youpublishitusingtheFile>Publishcommand.Thiscreatesacompressedversionofyourfilewiththeextension.swf.YoucanthenplaytheSWFfileinawebbrowserorasastand-aloneapplicationusingFlashPlayer.

WhatyoucandowithFlash

WiththewidearrayoffeaturesinFlash,youcancreatemanytypesofapplications.ThefollowingaresomeexamplesofthekindsofapplicationsFlashiscapableofgenerating:

AnimationsTheseincludebannerads,onlinegreetingcards,cartoons,andsoon.ManyothertypesofFlashapplicationsincludeanimationelementsaswell.

GamesManygamesarebuiltwithFlash.GamesusuallycombinetheanimationcapabilitiesofFlashwiththelogiccapabilitiesofActionScript.

UserinterfacesManywebsitedesignersuseFlashtodesignuserinterfaces.Theseincludesimplenavigationbarsaswellasmuchmorecomplexinterfaces.

FlexiblemessagingareasTheseareareasinwebpagesthatdesignersusefordisplayinginformationthatmaychangeovertime.Aflexiblemessagingarea（FMA）onarestaurantwebsitemightdisplayinformationabouteachday’smenuspecials.

RichInternetapplications

TheseincludeawidespectrumofapplicationsthatprovidearichuserinterfacefordisplayingandmanipulatingremotelystoreddataovertheInternet.ArichInternetapplicationcouldbeacalendarapplication,aprice-findingapplication,ashoppingcatalog,aneducationandtestingapplication,oranyotherapplicationthatpresentsremotedatawithagraphicallyrichinterface.

Dependingonyourprojectandyourworkingstyle,youmayusethesestepsinadifferentorder.AsyoubecomefamiliarwithFlashanditsworkflows,youwilldiscoverastyleofworkingthatsuitsyoubest.

AboutActionScriptandevents

InMacromediaFlashBasic8andMacromediaFlashProfessional8,ActionScriptcodeisexecutedwhenaneventoccurs:

forexample,whenamovieclipisloaded,whenakeyframeontheTimelineisentered,orwhentheuserclicksabutton.Eventscanbetriggeredeitherbytheuserorbythesystem.Usersclickmousebuttonsandpresskeys;thesystemtriggerseventswhenspecificconditionsaremetorprocessescompleted（themovieloads,theTimelinereachesacertainframe,agraphicfinishesdownloading,andsoon）.

Whenaneventoccurs,youwriteaneventhandlertorespondtotheeventwithanaction.Understandingwhenandwhereeventsoccurwillhelpyoutodeterminehowandwhereyouwillrespondtotheeventwithanaction,andwhichActionScripttoolsshouldbeusedineachcase.

Eventscanbegroupedintoanumberofcategories:

mouseandkeyboardevents,whichoccurwhenauserinteractswithyourFlashapplicationviathemouseandkeyboard;clipevents,whichoccurwithinmovieclips;andframeevents,whichoccurwithinframesontheTimeline.

Mouseandkeyboardevents

AuserinteractingwithyourFlashmovieorapplicationtriggersmouseandkeyboardevents.Forexample,whentheuserrollsoverabutton,theon（rollOver）eventoccurs;whenabuttonisclicked,theon（press）eventoccurs;ifakeyonthekeyboardispressed,theon（keyPress）eventoccurs.Youcanattachscriptstohandletheseeventsandaddalltheinteractivityyoudesire.

Clipevents

Withinamovieclip,youmayreacttoanumberofclipeventsthataretriggeredwhentheuserentersorexitsthesceneorinteractswiththesceneusingthemouseorkeyboard.Youmight,forexample,loadanexternalSWFfileorJPGimageintothemovieclipwhentheuserentersthescene,orallowtheuser’smousemovementstorepositionelementsinthescene.

Frameevents

OnamainormovieclipTimeline,asystemeventoccurswhentheplayheadentersakeyframe—thisisknownasaframeevent.Frameeventsareusefulfortriggeringactionsbasedonthepassageoftime（movingthroughtheTimeline）orforinteractingwithelementsthatarecurrentlyvisibleonthestage.Whenyouaddascripttoakeyframe,itisexecutedwhenthekeyframeisreachedduringplayback.Ascriptattachedtoaframeiscalledaframescript.

Oneofthemostcommonusesofframescriptsistostoptheplaybackwhenacertainkeyframeisreached.Thisisdonewiththestop（）function.Youselectakeyframeandthenaddthestop（）functionasascriptelementintheActionspanel.

Onceyou’vestoppedthemovieatacertainkeyframe,youneedtotakesomeaction.Youcould,forexample,useaframescripttodynamicallyupdatethevalueofalabel,tomanagetheinteractionofelementsonthestage,andsoon.Formoreinformation,seeChapter5,“HandlingEvents,”onpage#.

OrganizingActionScriptcode

Youmayattachscriptstokeyframesandtoobjectinstances（movieclips,buttons,andothersymbols）.However,ifyourActionScriptcodeisscatteredovermanykeyframesandobjectinstances,debuggingyourapplicationwillbemuchmoredifficult.ItwillalsobeimpossibletoshareyourcodebetweendifferentFlashapplications.Therefore,it’simportanttofollowbestpracticesforcodingwhenyoucreateActionScriptinFlash.

Ratherthanattachingyourscriptstoelementslikekeyframes,movieclips,andbuttons,youshouldrespondtoeventsbycallingfunctionsthatresideinacentrallocation.OnemethodistoattachembeddedActionScripttothefirstorsecondframeoftheTimelinewheneverpossiblesoyoudon’thavetosearchthroughtheFLAfiletofindallyourcode.AcommonpracticeistocreatealayercalledactionsandplaceyourActionScriptcodethere.

Whenyouattachallyourscriptstoindividualelements,you’reembeddingallyourcodeintheFLAfile.IfsharingyourcodebetweenotherFlashapplicationsisimportanttoyou,usetheScriptwindoworyourfavoritetexteditortocreateanexternalActionScript（AS）file.

Bycreatinganexternalfile,youmakeyourcodemoremodularandwellorganized.Asyourprojectgrows,thisconveniencebecomesmuchmoreusefulthanyoumightimagine.Anexternalfileaidsdebuggingandalsosourcecontrolmanagementifyou’reworkingonaprojectwithotherdevelopers.

TousetheActionScriptcodecontainedinanexternalASfile,youcreateascriptwithintheFLAfile