系統(tǒng)表達式用法級初步漢化版

歡迎加 1gbC2資C2比如你想知道精靈A到精靈B之間的距離你該怎么辦，需要用到系統(tǒng)表達式里的distance(x1,y1,x2,y2)函數(shù)x1，y1表示A原點坐標x2，y2表示精靈B標在需要填寫表達式的地方按下圖寫入表達式好了現(xiàn)在把c2系統(tǒng)系統(tǒng)表達本節(jié)概述了構(gòu)造2中的內(nèi)置System對象中的表達式。許多是常見的數(shù)算符，它們可以與“表達式”面板中的描述一起列出，但是這里包括它們是為了完整性。-System對象的表達式。有關(guān)如何在構(gòu)造2中使用表達式的一般信息，請參閱表達式。顯Windowsize;/TopRightBottom表達式。參見支持多種屏幕尺寸c2里指的對象是獲取圖層XYc2里指的對象是畫布操作后立即使用-您只能在“在畫布快照觸發(fā)器之后使用”。）表達式返回圖像文件的數(shù)據(jù)URI。這可以通過從URL加載圖像，發(fā)送到服務(wù)器或本地，或通過新的選SpriteTiledBackground對象。獲取通過設(shè)置布局縮放操作設(shè)置的整個布局的當前縮放。這不包括單個圖層的縮c2里指的角度的函數(shù)以度0度開始朝右，順時針增加。ABS（x）的x的絕對值A(chǔ)BS（-5）=anglelerp（A，B，x）的線性內(nèi)插角度一b由點ˉxlerp不同，這考慮到離結(jié)束小于步距離，則返回結(jié)束。ceil（x）x例如ceil（5.1）6cosp（a，b，x）abx。計算（A+B+（一-二）*COS（X*180°））/2。立方（，，，，）的一個b?和e由點xep（apa，b，c，），r（，cd，x，x）距離（，1，，）x（）計算e^xfoo（）舍入x例如or59=5fnity表示無窮大的浮點數(shù)值。e（，，）a到bxa+x（-）。une（，b，）反向線性插值：如果lp（，，x=y，則ulr（，，y）=。計算（-a）ba）。（）日志到x的ae。o1（）x1。（，b，c）（，b，c）圓周率的數(shù)學常數(shù)pi319）qa（，，，）一個b和?由點xepepab，x，lpb，c，x），x）。oun（）rndxrn（56=6sqr（）計算x例如sr（5=5701。32x的第n位設(shè)置為b（01）3232xn0110.32保存并加在“”“上保存JN使用從JN載操加載。關(guān)息，請如何制作保存游戲。c2里指的對象是（）WbL;如果nvaD0“R”，這不是格正確，因為非所有設(shè)都具有存。還要記住個表達不包括存使用，碼其他非圖資源。010.5，一半完成。有關(guān)詳細信息，請參閱教程Construct2中創(chuàng)建自定義加載屏幕和離線游戲。渲染器c2里指的對用來繪制游戲中，無論是當前的渲染器的名稱canvas2d或的。有關(guān)畫布渲染器的信息，請參閱技術(shù)用于繪制游戲的圖形硬件的名稱，例如“NVIDIAGeGTX660”或“Adreno330”。這只在某些瀏覽器和平臺的WebGL模式下可用;不支持的瀏覽器/系統(tǒng)將返回“（不可用）”GPU系GPU，或者查找關(guān)鍵字并根據(jù)硬件類型應(yīng)用默認圖形設(shè)置。c2里指的對象是find(src,left(text,返回第一個計數(shù)的字符文本返回文本中的字符數(shù)mid(text,index,返回計數(shù)啟動字的索引中的文本處理正則表達式RegexonString，并在結(jié)果列表中返回Index處的條目過程中的正則表達式正則表達式的字符串與標志，并返回結(jié)果列表中的條目數(shù)rece(src,find,查找所有出現(xiàn)的發(fā)現(xiàn)在SRC和替換它們代表right(text,返回最后計數(shù)的字符文本tokenat(src,index,從返回的第NSRC，通過拆分字符串分隔符。例如，tokenat（“apples|oranges|bananas”，1，“|”）返回橙子。src中發(fā)生多少個令牌。例如，tokencount（“apples|oranges|bananas”，“|”）3。墊數(shù)出一定數(shù)目的位數(shù)由在數(shù)字前面加上零，那么返回結(jié)果為字符串。（45，5）返回字符串“00045”c2里指的對象是GPU上，因此這種測量不能告訴你任何關(guān)于渲染的速度或速度fps是一個更好的措施。還要注意，這個測量是基于計時器，所以應(yīng)該被當作Javascript線程時間。當前幀每秒（FPS）60fps，c2里指的對choose(a,b[,隨機選擇一個給定的參數(shù)。例如，選擇（1，3，9，20）隨機選擇四個數(shù)字之一并返回。這也適用于字符串，例如choose（“ o或Hi?？梢允褂萌魏畏祷叵?，如果點ˉx小于下部，上部如果點ˉx大于上，否則返回點ˉxx轉(zhuǎn)換為浮點數(shù)（小數(shù)）x是文本，則在數(shù)字之后允許使用非數(shù)字float（“3.1xx”）3.1float（“xx3.1”）0。floattextx轉(zhuǎn)換為整數(shù)（整數(shù)）x是文本，則在數(shù)字之后允許使用非數(shù)字字int（“33xx”）33int（“xx33”）0。0,2.5,3.29293，而不是4.使用floor（random（4））只生成整數(shù)0,1,2,3abab生成包含RGB“YourscoreSystem英文版Thissectionoutlinestheexpressionsinthebuilt-inSystemobjectinConstruct2.Manyarecommonmathematicaloperators,andtheycanbelistedwithdescriptionsintheExpressionspanel,buttheyareincludedhereforThissectiondoesnotlisttheoperatorsorsyntaxthatcanbeusedinexpressions-justtheexpressionsspecifictotheSystemobject.FormoregeneralinformationonhowtouseexpressionsinConstruct2,seeExpressions.DisGettheoriginalvaluesoftheWindowsizeprojectGetthesizeofthecanvasbeingdisyedindevicepixels.Notethisisnotthesameastheviewport;seetheViewportLeft/Top/Right/Bottomexpressions.SeealsoSupportingmultiplescreenInexpressionswherealayerisrequired,eitheritsname(asastring)orindex(asanumber,zero-based)canbeentered.CanvasToLayerX(layer,x,y)CanvasToLayerY(layer,x,Calculatethelayoutco-ordinatesunderneathapositionincanvasco-ordinatesforagivenlayer.LayerToCanvasX(layer,x,y)LayerToCanvasY(layer,x,Calculatethecanvasco-ordinatesaboveapositioninlayoutco-ordinatesforagivenGettheangle,indegrees,ofaGetthezero-basedindexofalayerfromitsGettheopacity(orsemitransparency)ofalayer,from0(transparent)to100GetthecurrentparallaxXandYcomponentsofaGetthecurrentscaleofthelayer,notincludingtheoveralllayoutGetthecurrentscalerateofthelayer,whichdefineshowquicklyitscales(ifatReturntheviewportboundariesinlayoutco-ordinatesofagivenlayer.Notalllayershavethesameviewportiftheyareparallaxed,scaledorrotatedseparay.ContainstheresultingimagefromaSnapshotcanvasactionafterOncanvassnapshothasrun.(NotethisexpressionisnotavailableimmediayaftertheSnapshotcanvasaction-youcanonlyuseitafterOncanvassnapshottriggers.)TheexpressionreturnsadataURIoftheimagefile.ThiscanbeloadedintoaSpriteorTiledBackgroundobjectviaLoadimagefromURL,senttoaserverorstoredlocally,oropenedwiththeBrowserobjectinanewtabtosavetodisk.Gettheangle,indegrees,ofthecurrentlayout.Thisdoesnotincludetherotationofindividuallayers.GetthecurrentscaleoftheentirelayoutsetbytheSetlayoutscaleaction.Thisdoesnotincludethescalingofindividuallayers.GetthesizeofthecurrentlayoutinGetthenameofthecurrentGetthecurrentpositiontheviewiscenteredTheseexpressionsaresimplyordinarymathfunctionslikeyoufindoncalculators.However,notethatallfunctionsusinganangletakeitindegrees,notradians.Anglesstartwith0degreesfacingrightandincrementclockwise.sin(x),cos(x),tan(x),asin(x),acos(x),atan(x)Trigonometricfunctionsusinganglesindegrees.abs(x)Absolutevalueofxe.g.abs(-5)=angle(x1,y1,x2,y2)Calculateanglebetweentwoanglelerp(a,b,x)Linearlyinterpolatetheangleatobbyx.Unlikethestandardlerp,thistakesintoaccountthecyclicalnatureofangles.anglediff(a1,a2)Returnthesmallestdifferencebetweentwoanglesanglerotate(start,end,step)Rotateanglestarttowardsendbytheanglestep,allindegrees.Ifstartislessthanstepdegreesawayfromend,itreturnsend.ceil(x)Roundupxe.g.ceil(5.1)=cosp(a,b,x)Cosineinterpolationofatobbyx.Calculates(a+b+(a-b)*cos(x*180°))/2.cubic(a,b,c,d,x)Cubicinterpolationthrougha,b,canddbyx.Calculateslerp(qarp(a,b,c,x),qarp(b,c,d,x),x).distance(x1,y1,x2,y2)Calculatedistancebetweentwoexp(x)Calculatefloor(x)Rounddownxe.g.floor(5.9)=infinityAfloatingpointnumbervaluerepresentinglerp(a,b,x)Linearinterpolationofatobbyx.Calculatesa+x*(b-unlerp(a,b,y)Reverselinearinterpolation:iflerp(a,b,x)=y,thenunlerp(a,b,y)=x.Calculates(y-a)/(b-a).ln(x)Logtobaseeoflog10(x)Logtobase10ofmax(a,b[,c...]),min(a,b[,c...])Calculateumorminimumofthegivennumbers.Anynumberofparameterscanbeusedaslongasthereareatleasttwo.piThemathematicalconstantpiqarp(a,b,c,x)Quadraticinterpolationthrougha,bandcbyx.Calculateslerp(lerp(a,b,x),lerp(b,c,x),x).round(x)Roundxtothenearestwholenumbere.g.round(5.6)=sqrt(x)Calculatesquarerootofxe.g.sqrt(25)=getbit(x,Getthenthbitofxrepresentedasa32-bitinteger.Forexamplegetbit(7,0)willgettheleastsignificantbitofthenumber7whenrepresentedasa32-bitinteger.Returnseither0or1.setbit(x,n,Setthenthbitofxrepresentedasa32-bitintegertob(either0or1).Theresulting32-bitintegerisreturned.togglebit(x,Togglethenthbitofxrepresentedasa32-bitinteger.Ifthatbitis0,itissetto1;ifitis1,itissetto0.Theresulting32-bitintegerisreturned.Save&InOnsavecompleteorOnloadcomplete,returnsastringofJSONdatarepresentingthesavegamedata.ThiscanlaterbeloadedusingtheLoadfromJSONaction.FormoreinformationseeHowtomakesavegames.Returnstheestimatedtotalmemoryusage,inmegabytes,ofallthecurrently-loadedimages.OnlysupportedintheWebGLrenderer;ifcanvas2Drenderingisinuse,theexpressionalwaysreturns0.Noteimagememoryissometimesalsoreferredtoas"VRAM",butthisisnotstrictlycorrectsincenotalldeviceshave-specificmemory.Alsorememberthisexpressiondoesnotincludethememoryuseofsounds,code,orothernon-imageresources.Returnthecurrentloadprogressonaloaderlayout,orthecurrentupdateprogresswhiletheBrowserobject'sIsdownloadingupdateconditionistrue.Theprogressisreturnedasanumberfrom0to1,e.g.0.5forhalfcomplete.Formoreinformation,seethetutorialshowtomakeacustomloadingscreenandofflinegamesinConstructGettheindex(numberofrepeatssofar)inanycurrentlyrunningGettheindex(numberofrepeatssofar)oftheloopwiththegivenname.Usefulforgettingindicesinnestedloops.ThetotalnumberofobjectscurrentlyReturnthenameoftheprojectasitappearsinProjectReturntheversionenteredintoProjectProperties.Notethatthisisalwaysreturnedasastring,notanumber.Thenameoftherendererusedtodrawthegame,currentlyeithercanvas2dorwebgl.SeeTechnologyformoreinformationoncanvasrenderers.Thenameofthegraphicshardwareinusetodrawthegame,suchasGeGTX660"or"Adreno330".ThisisonlyavailableinWebGLmodeincertainbrowsersandtforms;unsupportedbrowsers/systemswillreturn"(unavailable)".Projectsshouldnotrelyonthisstringhavinganyexactcontents,butitcanbeusefultodiagnosewhichGPUisinuseindual-GPUsystems,ortolookfor andapplydefaultgraphicssettingsbasedonthetypeofhardware.find(src,text)findCase(src,text)Findthefirstindexwithinsrcthattextoccurs,elsereturns-1.findiscase-insensitive,andfindCaseiscase-sensitive.left(text,ReturnthefirstcountcharactersofReturnthenumberofcharactersinConvertthegiventexttoallmid(text,index,ReturnthecountcharactersstartingfromindexinAstringcontainingalinebreak.Usetoinsertlinebreaksintostrings,e.g." o"&newline&"World"RegexMatchAt(String,Regex,Flags,ProcesstheregularexpressionRegexonStringwithFlags,andinthelistofresults,returntheentryatIndex.ProcesstheregularexpressionRegexonStringwithFlags,andreturnthenumberofentriesinthelistofresults.RegexRece(String,Regex,Flags,ReInStringsubstitutematchesfortheregularexpressionRegex(withFlags)withthestringRece.Therecementstringcancontainthefollowingspecialcharacters:$$(insertsa$),$&(insertsthematchedsubstring),$`(insertstheportionofthestringthatprecedesthematchedsubstring),or$'(insertstheportionofthestringthatfollowsthematchedsubstring).RegexSearch(String,Regex,ReturntheindexofthefirstcharacterinStringwhereamatchforRegexwithFlagscouldbefound.rece(src,find,Findalloccurrencesoffindinsrcandrecethemwithright(text,Returnthelastcountcharactersoftokenat(src,index,ReturntheNthtokenfromsrc,splittingthestringbyseparator.Forexample,tokenat("apples|oranges|bananas",1,"|")returnsoranges.tokencount(src,Counthowmanytokensoccurinsrcusingseparator.Forexample,tokencount("apples|oranges|bananas","|")returns3.Returnsrcwithallwhitespace(spaces,tabsetc.)removedfromthebeginningandendofthestring.ConvertthegiventexttoallConverttoandfromastringinaformatsuitableforincludinginaURLorPOSTPadnumberouttoacertainnumberofdigitsbyaddingzeroesinfrontofthenumber,thenreturningtheresultasastring.Forexample,zeropad(45,5)returnsthestringThepercentageofthelastsecondthatwasspentintheapplicationlogic.Thisisforadvanceduserstomakeperformancemeasurements.Noteonhardware-accelerateddevicestherenderinghappensontheseparateGPUandthereforethismeasurementcannotlyouanythingabouthowfastorslowtherenderingis;forthatfpsisabettermeasure.Alsonotethismeasurementisbasedontimerssoshouldbetreatedasanapproximation,anditonlymeasuresthemainJavascriptthreadtime.Delta-timeinseconds.SeeDelta-timeandframerateThecurrentframespersecond(FPS)rate,whichishowmanytimesthescreenisbeingdrawneverysecond.Mostcomputersrunat60fpsiftheyarefastenough.ThenumberofticksthathaverunsincethegameThenumberofsecondssincethegamestarted,takingintoaccountthetimeThecurrenttimeThenumberofsecondssincethegamestarted,nottakingintoaccountthetimescale(i.e.thereal-worldt