Wiley-World.of.Warcraft.Programming.A.Guide.and.Reference.for.Creating.WoW.Addons

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70 Part I ■ Learning to ProgramDefining Basic Arithmetic Using ___add, ___sub, ___mul, and___divEach of the arithmetic metamethods ___add, ___sub, ___mul,and___div takestwo arguments and can (in theory) return anything you’d like. However, keepthe following in mind:The result of one operation may be part of a larger arithmetic expression.If you return a non-number from your metamethod, you should ensureit is capable of handling further arithmetic.If you return nil, it will break any arithmetic expression it is a part of, soit’s best to avoid that.The following function defines addition between two tables as a new tablewith the elements of the first table’s array part, followed by the elements ofthe second’s array part. Add the following function to your Lua interpreter:function mt.___add(a,b)local result = setmetatable({}, mt)-- Copy table a in firstfor i = 1, #a dotable.insert(result, a[i])end-- Copy table b in secondfor i = 1, #b dotable.insert(result, b[i])endreturn resultendTo simplify the function, the arguments have been named a and b.Thefirstline creates a new results table and makes sure to set the metatable correctly;without this the result might not work in a larger arithmetic expression. Therest of the function is straightforward, copying the elements of each table tothe new resulting table. Here is a simple test:> add_test = tbl1 + tbl2> print(#add_test)6> for i = 1, #add_test do print(i, add_test[i]) end1 alpha2 beta3 gamma4 delta5 epsilon6 zeta
Chapter 4 ■ Working with Tables 71The metamethod correctly handles the addition and creates a new tablewith the results of the addition. The other basic arithmetic operations couldbe defined in the same way. Instead of returning a table, these functions couldreturn some meaningful number that can be used as part of a larger formula.Defining Negation Using ___unmThe unary minus (negation) operator, __unm, expects exactly one argument,and should return the result of the argument being negated. In these examples,this will mean reversing the array part of the given table. Run the followingcode:function mt.___unm(a)local result = setmetatable({}, mt)-- Reverse through the elements of the arrayfor i = #a, 1,-1 dotable.insert(result, a[i])endreturn resultendTest table negation with a few examples:> unm_test = -tbl1> for i = 1, #unm_test do print(i, unm_test[i]) end1 gamma2 beta3 alpha> unm_test = -tbl1 + tbl2> for i = 1, #unm_test do print(i, unm_test[i]) end1 gamma2 beta3 alpha4 delta5 epsilon6 zetaCreating Meaningful Output with ___tostringIn the current example, it would be useful to print the table and have it displaythe elements rather than the unique string Lua provides. You can accomplishthat using the ___tostring metamethod, which takes a single argument (thetable) and should return a string.Run the following code:function mt.___tostring(tbl)local result = “{“for i = 1, #tbl do
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A Guide and Reference for Creating
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World of Warcraft® Programming: A
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CreditsAcquisitions EditorScott Mey
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xAcknowledgmentsI’d first like to
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xiiContents at a GlanceChapter 13 R
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xivContentsUsing History to Make Ch
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xviContentsExtending Tables with Me
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xviiiContents## Title: 127## Notes:
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xxContentsInvestigating UIPanelTemp
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xxiiContentsAdding an OnEvent Handl
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xxivContentsPreparing for the Token
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xxviContentsWriting an OnUpdate Fun
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xxviii ContentsSummary 496The Code
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xxxContentsChapter 28 API Categorie
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xxxii ContentsTrade Skill Functions
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xxxiv ContentsRequesting Data Befor
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IntroductionSince World of Warcraft
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Introduction xxxixPart II discusses
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CHAPTER1Programming for Worldof War
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Chapter 1 ■ Programming for World
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CHAPTER2Exploring Lua BasicsLua is
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Chapter 2 ■ Exploring Lua Basics
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Chapter 2 ■ Exploring Lua Basics
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CHAPTER8Anatomy of an AddonAs discu
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Chapter 8 ■ Anatomy of an Addon 1
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CHAPTER12Interacting with WidgetsYo
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CHAPTER14Tracking Damage withCombat
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CHAPTER16Binding Keys and Clicksto
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338 Part III ■ Advanced Addon Tec
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CHAPTER18Responding to Graphic Upda
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CHAPTER21Responding to the Combat L
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CHAPTER22Creating Scroll FramesWhen
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CHAPTER24Scanning and ConstructingT
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CHAPTER25Taking Protected Actionin
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PartIVReferenceIn This PartChapter
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620 Part IV ■ ReferenceCOMBATLOG_
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622 Part IV ■ ReferenceUsable bet
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624 Part IV ■ ReferenceCreateMacr
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666 Part IV ■ Referencebreakenden
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674 Part IV ■ ReferenceGetCVarMin
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676 Part IV ■ ReferenceReturns:ch
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678 Part IV ■ ReferenceGetChatWin
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680 Part IV ■ ReferenceCR_CRIT_TA
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682 Part IV ■ Referenceenable—1
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690 Part IV ■ ReferenceGetCurrent
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692 Part IV ■ ReferencesubType—
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702 Part IV ■ ReferenceThis funct
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710 Part IV ■ Referencestationery
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726 Part IV ■ ReferenceReturns:ma
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728 Part IV ■ ReferenceisLeader
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736 Part IV ■ ReferenceGetMapInfo
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752 Part IV ■ ReferenceGetNumFrie
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754 Part IV ■ Referenceindex—In
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756 Part IV ■ ReferenceOnly valid
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758 Part IV ■ ReferenceGetNumSave
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1090 Part IV ■ ReferenceGetGossip
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1092 Part IV ■ ReferenceGetQuestL
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1100 Part IV ■ ReferenceIsAttackS
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1106 Part IV ■ ReferenceTracking
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1108 Part IV ■ ReferenceGetTradeS
Page 1152 and 1153:
1110 Part IV ■ ReferenceIsTrainer
Page 1154 and 1155:
1112 Part IV ■ ReferenceUnitInBat
Page 1156 and 1157:
1114 Part IV ■ ReferenceGetCurren
Page 1158 and 1159:
1116 Part IV ■ ReferenceVehicleAi
Page 1160 and 1161:
1118 Part IV ■ ReferenceDisplayCh
Page 1163 and 1164:
CHAPTER29Widget ReferenceTo respond
Page 1165 and 1166:
Chapter 29 ■ Widget Reference 112
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1278 Part IV ■ ReferenceADDON_ACT
Page 1322 and 1323:
1280 Part IV ■ ReferenceCALENDAR_
Page 1324 and 1325:
1282 Part IV ■ ReferenceCHAT_MSG_
Page 1326 and 1327:
1284 Part IV ■ ReferenceCORPSE_OU
Page 1328 and 1329:
1286 Part IV ■ ReferenceGUILDBANK
Page 1330 and 1331:
1288 Part IV ■ ReferenceKNOWLEDGE
Page 1332 and 1333:
1290 Part IV ■ ReferenceOPEN_TABA
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1292 Part IV ■ ReferencePLAYER_EN
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1294 Part IV ■ ReferenceQUEST_LOG
Page 1338 and 1339:
1296 Part IV ■ ReferenceTRADE_POT
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1298 Part IV ■ ReferenceUNIT_PET_
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1300 Part IV ■ ReferenceUPDATE_MA
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PartVAppendixesIn This PartAppendix
Page 1348 and 1349:
1306 Part V ■ AppendixesUse Meani
Page 1350 and 1351:
1308 Part V ■ Appendixeshard codi
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1310 Part V ■ AppendixesOrganizat
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1312 Part V ■ Appendixesespeciall
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1314 Part V ■ Appendixesitself to
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1316 Part V ■ AppendixesTAIL CALL
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1318 Part V ■ AppendixesEach time
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1320 Part V ■ AppendixesEven if y
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1322 Part V ■ AppendixesEach even
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1324 Part V ■ Appendixesthe basic
Page 1368 and 1369:
1326 Part V ■ AppendixesEntering
Page 1371 and 1372:
APPENDIXBUtilizing Addon LibrariesW
Page 1373 and 1374:
Appendix B ■ Utilizing Addon Libr
Page 1375 and 1376:
Page 1377 and 1378:
Page 1379:
Page 1382 and 1383:
1340 Part V ■ AppendixesOne major
Page 1384 and 1385:
1342 Part V ■ Appendixessvn updat
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1344 Part V ■ AppendixesGit and M
Page 1388 and 1389:
1346 Part V ■ AppendixesOnce that
Page 1390 and 1391:
1348 Part V ■ Appendixesremote: a
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1350 Part V ■ Appendixeshave alre
Page 1394 and 1395:
1352 Part V ■ Appendixesthe other
Page 1396 and 1397:
1354 Part V ■ Appendixesand open
Page 1399 and 1400:
IndexAAbandonQuest, 556AbandonSkill
Page 1401 and 1402:
Index ■ A-B 1359hyperlink, 549-55
Page 1403 and 1404:
Index ■ B-C 1361BuyPetition, 564B
Page 1405 and 1406:
Index ■ C-C 1363Lua library funct
Page 1407 and 1408:
Index ■ C-C 1365storing damage an
Page 1409 and 1410:
Index ■ D-E 1367dropdown frames,
Page 1411 and 1412:
Index ■ F-F 1369TabButtonTemplate
Page 1413 and 1414:
Index ■ G-G 1371GetAchievementNum
Page 1415 and 1416:
Index ■ G-G 1373GetGameTime, 699G
Page 1417 and 1418:
Index ■ G-G 1375GetNumLetters(),
Page 1419 and 1420:
Index ■ G-G 1377GetStatusBarColor
Page 1421 and 1422:
Index ■ G-I 1379GuildInvite, 832G
Page 1423 and 1424:
Index ■ I-K 1381IsPlaying(), Anim
Page 1425 and 1426:
Index ■ L-M 1383Lua interpreterdo
Page 1427 and 1428:
Index ■ O-O 1385OnClick widget sc
Page 1429 and 1430:
Index ■ P-R 1387PlaySoundFile, 89
Page 1431 and 1432:
Index ■ S-S 1389how addon code ca
Page 1433 and 1434:
Index ■ S-S 1391SetInventoryItem(
Page 1435 and 1436:
Index ■ S-S 1393overview of, 337S
Page 1437 and 1438:
Index ■ T-T 1395table.insert, 58-
Page 1439 and 1440:
Index ■ U-U 1397UnitArmor, 962Uni
Page 1441 and 1442:
Index ■ W-W 1399WWebLua, 15well-f
Page 1443:
Your secret weapon againstthe Lich
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Wiley-World.of.Warcraft.Programming.A.Guide.and.Reference.for.Creating.WoW.Addons

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