系统表达式用法级初步汉化版

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1gbC2资C2比如你想知道精灵A到精灵B之间的距离你该怎么办，需要用到系统表达式里的distance(x1,y1,x2,y2)函数x1，y1表示A原点坐标x2，y2表示精灵B标在需要填写表达式的地方按下图写入表达式好了现在把c2系统系统表达本节概述了构造2中的内置System对象中的表达式。许多是常见的数算符，它们可以与“表达式”面板中的描述一起列出，但是这里包括它们是为了完整性。-System对象的表达式。有关如何在构造2中使用表达式的一般信息，请参阅表达式。显Windowsize;/TopRightBottom表达式。参见支持多种屏幕尺寸c2里指的对象是获取图层XYc2里指的对象是画布操作后立即使用-您只能在“在画布快照触发器之后使用”。）表达式返回图像文件的数据URI。这可以通过从URL加载图像，发送到服务器或本地，或通过新的选SpriteTiledBackground对象。获取通过设置布局缩放操作设置的整个布局的当前缩放。这不包括单个图层的缩c2里指的角度的函数以度0度开始朝右，顺时针增加。ABS（x）的x的绝对值ABS（-5）=anglelerp（A，B，x）的线性内插角度一b由点¯xlerp不同，这考虑到离结束小于步距离，则返回结束。ceil（x）x例如ceil（5.1）6cosp（a，b，x）abx。计算（A+B+（一-二）*COS（X*180°））/2。立方（，，，，）的一个bÇ和ð由点xep（apa，b，c，），r（，cd，x，x）距离（，1，，）x（）计算e^xfoo（）舍入x例如or59=5fnity表示无穷大的浮点数值。e（，，）a到bxa+x（-）。une（，b，）反向线性插值：如果lp（，，x=y，则ulr（，，y）=。计算（-a）ba）。（）日志到x的ae。o1（）x1。（，b，c）（，b，c）圆周率的数学常数pi319）qa（，，，）一个b和Ç由点xepepab，x，lpb，c，x），x）。oun（）rndxrn（56=6sqr（）计算x例如sr（5=5701。32x的第n位设置为b（01）3232xn0110.32保存并加在“”“上保存JN使用从JN载操加载。关息，请如何制作保存游戏。c2里指的对象是（）WbL;如果nvaD0“R”，这不是格正确，因为非所有设都具有存。还要记住个表达不包括存使用，码其他非图资源。010.5，一半完成。有关详细信息，请参阅教程Construct2中创建自定义加载屏幕和离线游戏。渲染器c2里指的对用来绘制游戏中，无论是当前的渲染器的名称canvas2d或的。有关画布渲染器的信息，请参阅技术用于绘制游戏的图形硬件的名称，例如“NVIDIAGeGTX660”或“Adreno330”。这只在某些浏览器和平台的WebGL模式下可用;不支持的浏览器/系统将返回“（不可用）”GPU系GPU，或者查找关键字并根据硬件类型应用默认图形设置。c2里指的对象是find(src,left(text,返回第一个计数的字符文本返回文本中的字符数mid(text,index,返回计数启动字的索引中的文本处理正则表达式RegexonString，并在结果列表中返回Index处的条目过程中的正则表达式正则表达式的字符串与标志，并返回结果列表中的条目数rece(src,find,查找所有出现的发现在SRC和替换它们代表right(text,返回最后计数的字符文本tokenat(src,index,从返回的第NSRC，通过拆分字符串分隔符。例如，tokenat（“apples|oranges|bananas”，1，“|”）返回橙子。src中发生多少个令牌。例如，tokencount（“apples|oranges|bananas”，“|”）3。垫数出一定数目的位数由在数字前面加上零，那么返回结果为字符串。（45，5）返回字符串“00045”c2里指的对象是GPU上，因此这种测量不能告诉你任何关于渲染的速度或速度fps是一个更好的措施。还要注意，这个测量是基于计时器，所以应该被当作Javascript线程时间。当前帧每秒（FPS）60fps，c2里指的对choose(a,b[,随机选择一个给定的参数。例如，选择（1，3，9，20）随机选择四个数字之一并返回。这也适用于字符串，例如choose（“ o或Hi。可以使用任何返回下，如果点¯x小于下部，上部如果点¯x大于上，否则返回点¯xx转换为浮点数（小数）x是文本，则在数字之后允许使用非数字float（“3.1xx”）3.1float（“xx3.1”）0。floattextx转换为整数（整数）x是文本，则在数字之后允许使用非数字字int（“33xx”）33int（“xx33”）0。0,2.5,3.29293，而不是4.使用floor（random（4））只生成整数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