项目场景：

在使用qt中的painter直接进行绘制时，有时会用到fillrect进行填充矩形的展示，此函数预设了很多的颜色，在网上我暂时没找到直接能够查看的颜色展示，在此我写一个程序用于直接展示出来，截图在此，方便自己以及有一样需求的人直接查看

代码描述：

通过生成pdf以及保存pdf的方式，直接调用QPdfWriter，QPrinter这两种库，进行编程展示。需要提前引入printsupport的插件（和gui，charts差不多的东西）。最终代码以及展示结果见正文，不想看的也可以直接看结果。（QT5.12.5以上版本才有）

1.fillRect代码和预设值有关的函数

inline void fillRect(int x, int y, int w, int h, QGradient::Preset preset);
inline void fillRect(const QRect &r, QGradient::Preset preset);
inline void fillRect(const QRectF &r, QGradient::Preset preset);

2.展示代码

 //设置pdf保存的路径QString file_path = pdfSaveAs(QString::fromLocal8Bit("展示QGradient预设值"));if(file_path.isEmpty())return;QFile pdfFile(file_path);pdfFile.open(QIODevice::WriteOnly);QPdfWriter* pWriter = new QPdfWriter(&pdfFile);//Init PagepWriter->setPageSize(QPagedPaintDevice::A4);pWriter->setResolution(300);    //设置dpi 每个平方英寸像素为300pWriter->setPageMargins(QMarginsF(30, 30, 30, 30));QPainter* pPainter = new QPainter(pWriter);//Painter PDFqDebug() << pPainter->viewport();int nPDFWidth = pPainter->viewport().width();int nPDFHeight = pPainter->viewport().height();//test startint realcolor = 0;int realheight = 0;while (realcolor < 180){realcolor++;QGradient::Preset a = QGradient::Preset(realcolor);pPainter->fillRect(QRect(0, realheight, nPDFWidth, 100), a);pPainter->setFont(QFont("黑体", 26, 60));pPainter->drawText(QRect(0, realheight, nPDFWidth, 100), Qt::AlignCenter,QString::fromLocal8Bit("测试预设颜色%1").arg(realcolor));realheight += 100;if (realheight >= nPDFHeight){pWriter->newPage();realheight = 0;}}//test end//绘制完毕delete pPainter;delete pWriter;pdfFile.close();//通过其它PDF阅读器来打开PDFQDesktopServices::openUrl(QUrl::fromLocalFile(file_path));

结果图展示：

enum Preset {WarmFlame = 1,NightFade = 2,SpringWarmth = 3,JuicyPeach = 4,YoungPassion = 5,LadyLips = 6,SunnyMorning = 7,RainyAshville = 8,FrozenDreams = 9,WinterNeva = 10,DustyGrass = 11,TemptingAzure = 12,HeavyRain = 13,AmyCrisp = 14,MeanFruit = 15,DeepBlue = 16,RipeMalinka = 17,CloudyKnoxville = 18,MalibuBeach = 19,NewLife = 20,TrueSunset = 21,MorpheusDen = 22,RareWind = 23,NearMoon = 24,WildApple = 25,SaintPetersburg = 26,PlumPlate = 28,EverlastingSky = 29,HappyFisher = 30,Blessing = 31,SharpeyeEagle = 32,LadogaBottom = 33,LemonGate = 34,ItmeoBranding = 35,ZeusMiracle = 36,OldHat = 37,StarWine = 38,HappyAcid = 41,AwesomePine = 42,NewYork = 43,ShyRainbow = 44,MixedHopes = 46,FlyHigh = 47,StrongBliss = 48,FreshMilk = 49,SnowAgain = 50,FebruaryInk = 51,KindSteel = 52,SoftGrass = 53,GrownEarly = 54,SharpBlues = 55,ShadyWater = 56,DirtyBeauty = 57,GreatWhale = 58,TeenNotebook = 59,PoliteRumors = 60,SweetPeriod = 61,WideMatrix = 62,SoftCherish = 63,RedSalvation = 64,BurningSpring = 65,NightParty = 66,SkyGlider = 67,HeavenPeach = 68,PurpleDivision = 69,AquaSplash = 70,SpikyNaga = 72,LoveKiss = 73,CleanMirror = 75,PremiumDark = 76,ColdEvening = 77,CochitiLake = 78,SummerGames = 79,PassionateBed = 80,MountainRock = 81,DesertHump = 82,JungleDay = 83,PhoenixStart = 84,OctoberSilence = 85,FarawayRiver = 86,AlchemistLab = 87,OverSun = 88,PremiumWhite = 89,MarsParty = 90,EternalConstance = 91,JapanBlush = 92,SmilingRain = 93,CloudyApple = 94,BigMango = 95,HealthyWater = 96,AmourAmour = 97,RiskyConcrete = 98,StrongStick = 99,ViciousStance = 100,PaloAlto = 101,HappyMemories = 102,MidnightBloom = 103,Crystalline = 104,PartyBliss = 106,ConfidentCloud = 107,LeCocktail = 108,RiverCity = 109,FrozenBerry = 110,ChildCare = 112,FlyingLemon = 113,NewRetrowave = 114,HiddenJaguar = 115,AboveTheSky = 116,Nega = 117,DenseWater = 118,Seashore = 120,MarbleWall = 121,CheerfulCaramel = 122,NightSky = 123,MagicLake = 124,YoungGrass = 125,ColorfulPeach = 126,GentleCare = 127,PlumBath = 128,HappyUnicorn = 129,AfricanField = 131,SolidStone = 132,OrangeJuice = 133,GlassWater = 134,NorthMiracle = 136,FruitBlend = 137,MillenniumPine = 138,HighFlight = 139,MoleHall = 140,SpaceShift = 142,ForestInei = 143,RoyalGarden = 144,RichMetal = 145,JuicyCake = 146,SmartIndigo = 147,SandStrike = 148,NorseBeauty = 149,AquaGuidance = 150,SunVeggie = 151,SeaLord = 152,BlackSea = 153,GrassShampoo = 154,LandingAircraft = 155,WitchDance = 156,SleeplessNight = 157,AngelCare = 158,CrystalRiver = 159,SoftLipstick = 160,SaltMountain = 161,PerfectWhite = 162,FreshOasis = 163,StrictNovember = 164,MorningSalad = 165,DeepRelief = 166,SeaStrike = 167,NightCall = 168,SupremeSky = 169,LightBlue = 170,MindCrawl = 171,LilyMeadow = 172,SugarLollipop = 173,SweetDessert = 174,MagicRay = 175,TeenParty = 176,FrozenHeat = 177,GagarinView = 178,FabledSunset = 179,PerfectBlue = 180,NumPresets};

QT-常用函数参数详解之painter-＞fillRect()，预设值的颜色展示相关推荐

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QT-常用函数参数详解之painter-＞fillRect()，预设值的颜色展示

项目场景：

代码描述：

结果图展示：

QT-常用函数参数详解之painter-＞fillRect()，预设值的颜色展示相关推荐

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