😊 今天給大家分享一個擺鐘風(fēng)格的加載動畫 😊
效果如下:

最近工作忙起來了 , 后續(xù)再分享其他有趣的加載動畫吧.
一共三個文件 , 可以直接編譯運(yùn)行

//main.cpp
#include "LoadingAnimWidget.h"
#include <QApplication>
#include <QGridLayout>
int main(int argc, char *argv[])
{QApplication a(argc, argv);QWidget w;w.setWindowTitle("加載動畫 第10季");QGridLayout * mainLayout = new QGridLayout;auto* anim1 = new ThreeMovingZoomingBalls;mainLayout->addWidget(anim1,0,0);auto* anim2 = new FourRotatingFireBall;mainLayout->addWidget(anim2,0,1);auto* anim3 = new CookieMonster;mainLayout->addWidget(anim3,0,2);auto* anim4 = new StickCircle;anim4->setStickColor("lime");anim4->setStickWidth(16);anim4->setStickLength(32);mainLayout->addWidget(anim4,1,0);auto* anim5 = new PendulumClock;mainLayout->addWidget(anim5,1,1);auto* anim6 = new AmpereMeter;mainLayout->addWidget(anim6,1,2);w.setLayout(mainLayout);w.show();anim1->start();anim2->start();anim3->start();anim4->start();anim5->start();anim6->start();return a.exec();
}

//LoadingAnimWidget.h
#ifndef LOADINGANIMWIDGET_H
#define LOADINGANIMWIDGET_H
#include <QPropertyAnimation>
#include <QWidget>
class LoadingAnimBase:public QWidget
{Q_OBJECTQ_PROPERTY(qreal angle READ angle WRITE setAngle)
public:LoadingAnimBase(QWidget* parent=nullptr);virtual ~LoadingAnimBase();qreal angle()const;void setAngle(qreal an);
public slots:virtual void exec();virtual void start();virtual void stop();
protected:QPropertyAnimation mAnim;qreal mAngle;
};
class StickCircle:public LoadingAnimBase
{Q_OBJECT
public:explicit StickCircle(QWidget* parent = nullptr);void setStickLength(qreal len);void setStickWidth(qreal len);void setStickColor(const QColor& color);
protected:void paintEvent(QPaintEvent *event);
private:qreal mStickLen;qreal mStickWidth;QColor mStickColor;
};
class ThreeMovingZoomingBalls:public LoadingAnimBase{//三個一邊移動一邊縮放的小球
public:ThreeMovingZoomingBalls(QWidget* parent = nullptr);
protected:void paintEvent(QPaintEvent*);
};
class FourRotatingFireBall:public LoadingAnimBase{//四個旋轉(zhuǎn)的火球,說他是火球是因為快速轉(zhuǎn)動的時候它有殘影,看上去像弧線
public:FourRotatingFireBall(QWidget* parent = nullptr);
protected:void paintEvent(QPaintEvent*);
};
class CookieMonster:public LoadingAnimBase{//一個不停吃餅干的怪獸
public:CookieMonster(QWidget* parent = nullptr);
protected:void paintEvent(QPaintEvent*);
};
class PendulumClock:public LoadingAnimBase{//吊鐘鐘擺
public:PendulumClock(QWidget* parent = nullptr);
protected:void paintEvent(QPaintEvent*);
};
class AmpereMeter :public LoadingAnimBase{//電流表的指針
public:AmpereMeter(QWidget* parent = nullptr);
protected:void paintEvent(QPaintEvent*);
};#endif

//LoadingAnimWidget.cpp
#include "LoadingAnimWidget.h"
#include <QDebug>
#include <QPaintEvent>
#include <QPainter>
#include <QtMath>
#include <QRandomGenerator>
LoadingAnimBase::LoadingAnimBase(QWidget* parent):QWidget(parent){mAnim.setPropertyName("angle");mAnim.setTargetObject(this);mAnim.setDuration(2000);mAnim.setLoopCount(-1);//run forevermAnim.setEasingCurve(QEasingCurve::Linear);setFixedSize(200,200);mAngle = 0;
}
LoadingAnimBase::~LoadingAnimBase(){}
void LoadingAnimBase::exec(){if(mAnim.state() == QAbstractAnimation::Stopped){start();}else{stop();}
}
void LoadingAnimBase::start(){mAnim.setStartValue(0);mAnim.setEndValue(360);mAnim.start();
}
void LoadingAnimBase::stop(){mAnim.stop();
}
qreal LoadingAnimBase::angle()const{ return mAngle;}
void LoadingAnimBase::setAngle(qreal an){mAngle = an;update();
}
StickCircle::StickCircle(QWidget *parent) : LoadingAnimBase(parent),mStickLen(-1),mStickWidth(10),mStickColor("black"){}
void StickCircle::setStickLength(qreal len){if(len > 0 && len != mStickLen){mStickLen = len;update();}
}
void StickCircle::setStickWidth(qreal len){if(len > 0 && len != mStickWidth){mStickWidth = len;update();}
}
void StickCircle::setStickColor(const QColor& color){if(color.isValid() && mStickColor != color){mStickColor = color;update();}
}
void StickCircle::paintEvent(QPaintEvent *event){QPainter painter(this);painter.setRenderHints(QPainter::Antialiasing);int x = width();int y = height();qreal ang = mAngle;painter.setPen(Qt::NoPen);painter.translate(x/2,y/2);QColor lightColor = mStickColor;lightColor.setAlphaF(0.1);const int stickw = mStickWidth;//小棍子的寬度qreal stickl = x / 4;//小棍子的長度if(mStickLen > 0) stickl = mStickLen;QColor highlight = mStickColor;const int startIdx = ang / 30;//開頭的深色小棍子的索引號const int arr[14] = {0,1,2,3,4,5,6,7,8,9,10,11,0,1};QList<int> hightlightList{arr[startIdx],arr[startIdx+1],arr[startIdx+2]};QList<qreal> alphaList{0.5,0.75,0.99};//三根深色的小棍子的透明度for(int i = 0;i < 12;++i){if(hightlightList.contains(i)){auto hc = highlight;hc.setAlphaF(alphaList[0]);painter.setBrush(QBrush(hc));alphaList.pop_front();}else {painter.setBrush(QBrush(lightColor));}painter.drawRoundedRect(QRectF(-stickw/2,0.375*y -stickl/2-1,stickw,stickl),stickw/2,stickw/2);auto transform = painter.transform();transform.rotate(30);painter.setTransform(transform);}
}
ThreeMovingZoomingBalls::ThreeMovingZoomingBalls(QWidget* parent):LoadingAnimBase(parent){}
void ThreeMovingZoomingBalls::paintEvent(QPaintEvent*){QPainter painter(this);painter.setRenderHint(QPainter::Antialiasing);painter.setPen(Qt::NoPen);painter.setBrush(QBrush("cadetblue"));qreal x = width();qreal y = height();painter.translate(0,y/2);const qreal delta = 0.08*x;const qreal minr = 0.02*x;for(int i = 0;i < 5;++i){qreal ang = mAngle + 90*i;qreal posx = ang/360*x;if(posx > x) posx -= x;qreal r = minr + delta * qSin(M_PI / x * posx);painter.drawEllipse(QPointF(posx,0),r,r);}
}
FourRotatingFireBall::FourRotatingFireBall(QWidget* parent){}
void FourRotatingFireBall::paintEvent(QPaintEvent*){QPainter painter(this);painter.setRenderHint(QPainter::Antialiasing);QPen pen;pen.setCapStyle(Qt::RoundCap);pen.setWidth(12);painter.setPen(pen);painter.setBrush(Qt::NoBrush);const qreal x = width();const qreal y = height();const qreal r = 0.4*y;const qreal maxArc = 30;for(int i = 0;i <4;++i){painter.resetTransform();painter.translate(x/2,y/2);painter.rotate(90*i);if(i % 2 == 0){pen.setColor("lightblue");painter.setPen(pen);}else{pen.setColor("lightpink");painter.setPen(pen);}if(mAngle < 30){ //啟動火球,畫出弧線qreal ratio = mAngle / 30;painter.drawArc(QRectF(-r,-r,2*r,2*r),16*90,16*-ratio*maxArc);}else if(mAngle < 330){//轉(zhuǎn)動兩圈qreal ratio = (mAngle - 30) / 300;painter.rotate((720-maxArc)*ratio);painter.drawArc(QRectF(-r,-r,2*r,2*r),16*90,16*-maxArc);}else{//收起弧線qreal ratio = (mAngle - 330) / 30;painter.drawArc(QRectF(-r,-r,2*r,2*r),16*90,16*(1-ratio)*maxArc);}}
}
CookieMonster::CookieMonster(QWidget* parent):LoadingAnimBase(parent){}void CookieMonster::paintEvent(QPaintEvent*){QPainter painter(this);painter.setRenderHint(QPainter::Antialiasing);const qreal x = width();const qreal y = height();const qreal r = 0.2*x;painter.setPen(Qt::NoPen);painter.setBrush(QBrush("royalblue"));painter.translate(4,y/2);qreal startAngle = 22.5 + 22.5*qSin(M_PI / 90 * mAngle + M_PI/2);qreal span = 360 - 2*startAngle;painter.drawPie(QRectF(0,-r,2*r,2*r),startAngle*16,span*16);painter.setBrush(QBrush("white"));painter.drawEllipse(QPointF(r*0.8,-r/2),4,4);//畫移動的小餅干painter.setBrush(QBrush("lightgreen"));painter.resetTransform();painter.translate(x,y/2);qreal ratio = mAngle / 360;for(int i = 0;i <3;++i){ratio += 0.333;if(ratio > 1) ratio -= 1;painter.drawEllipse(QPointF( -(x-2*r)*ratio,0 ) , 8,8);}
}
PendulumClock::PendulumClock(QWidget* parent):LoadingAnimBase(parent){}void PendulumClock::paintEvent(QPaintEvent*){QPainter painter(this);painter.setRenderHint(QPainter::Antialiasing);const qreal x = width();const qreal y = height();painter.translate(x/2,y/8);QPen pen("silver");pen.setWidth(4);painter.setPen(pen);painter.rotate(30*qSin(M_PI/180*mAngle));painter.setBrush(QBrush("silver"));painter.drawLine(0,0,0,0.6*y);painter.translate(0,0.6*y);painter.drawEllipse(QPointF(0,0),16,16);
}
AmpereMeter::AmpereMeter(QWidget* parent):LoadingAnimBase(parent){}void AmpereMeter::paintEvent(QPaintEvent*){QPainter painter(this);painter.setRenderHint(QPainter::Antialiasing);const qreal x = width();const qreal y = height();painter.translate(x/2,y*0.6);QPen pen("dimgray");pen.setWidth(4);painter.setPen(pen);painter.setBrush(Qt::NoBrush);const qreal r = x*0.4;//step1 先畫一個表框painter.drawArc(QRectF(-r,-r,2*r,2*r),0,180*16);//step2 再畫半圈刻度qreal gap = 180 / 14.0;painter.rotate(-90);for(int i = 1;i <= 13;++i){painter.rotate(gap);painter.drawLine(0,-r + 6,0,-r + 8);}//step3 畫指針painter.resetTransform();painter.translate(x/2,y*0.6);painter.rotate(80*qSin(M_PI/180*mAngle));painter.drawLine(0,0,0,-r*0.7);}