Qt自定义定时器

た入场券 2021-09-22 10:12 404阅读 0赞

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主要代码

#include "oventimer.h"
    #include "ui_oventimer.h"
    
    #ifndef M_PI
    #define M_PI    3.1415926359
    #endif
    //每分钟以及每秒的度数
    const double DegreesPerMinute =7.0;
    const double DegreesPerSecond = DegreesPerMinute/60;
    const int MaxMinute=45;
    const int MaxSeconds=MaxMinute*60;
    const int UpdateInterval =3;    //3s转动一次
    
    OvenTimer::OvenTimer(QWidget *parent) :
        QWidget(parent),
        ui(new Ui::OvenTimer)
    {
        ui->setupUi(this);
    
        updateTimer=new QTimer(this);
        connect(updateTimer,SIGNAL(timeout()),this,SLOT(update()));
    
        finishTimer=new QTimer();
        finishTimer->setSingleShot(true);
        connect(finishTimer,SIGNAL(timeout()),this,SLOT(onTimeout()));//SLOT(timeout()) OvenTimer的
    
        QFont font;
        font.setPointSize(8);
        setFont(font);
    
    }
    
    OvenTimer::~OvenTimer()
    {
        delete ui;
    }
    
    void OvenTimer::paintEvent(QPaintEvent *event)
    {
        QImage image(size(),QImage::Format_ARGB32_Premultiplied);
        QPainter imagePainter(&image);       //在QImage里画
        imagePainter.setRenderHint(QPainter::Antialiasing,true);
       // QPainter painter(this);
        //painter.setRenderHint(QPainter::Antialiasing,true); //反锯齿
    
        int side =qMin(width(),height());  //(取宽度与高度的较小值)用来做窗口和视口的
        imagePainter.setViewport((width()-side)/2,(height()-side)/2,side,side);
        imagePainter.setWindow(-50,-50,100,100);
    
    
        draw(&imagePainter);
        imagePainter.end();
    
        QPainter widgetPainter(this);   //直接显示      画的交给QIamge
        widgetPainter.drawImage(0,0,image);
        //draw(&painter);
    }
    void OvenTimer::draw(QPainter *painter)
    {
        static const int triangle[3][2]={
            {-2,-49},{2,-49},{0,-47}
        };
    
        QPen thickPen(palette().foreground(),1.5);   //粗笔 颜色前景色
        QPen thinPen(palette().foreground(),0.5);    //细笔
        QColor niceBlue(150,150,200);
    
        painter->setPen(thinPen);
        painter->setBrush(palette().foreground());
        painter->drawPolygon(QPolygon(3,&triangle[0][0]));
    
        QConicalGradient coneGradient(0,0,-90.0);   //锥形渐变
        coneGradient.setColorAt(0.0,Qt::darkGray);
        coneGradient.setColorAt(0.2,niceBlue);
        coneGradient.setColorAt(0.5,Qt::white);
        coneGradient.setColorAt(1.0,Qt::darkGray);
    
        painter->setBrush(coneGradient);
        painter->drawEllipse(-46,-46,92,92);
    
        QRadialGradient haloGradient(0,0,20,0,0);
        haloGradient.setColorAt(0.0,Qt::lightGray);
        haloGradient.setColorAt(0.8,Qt::darkGray);
        haloGradient.setColorAt(0.9,Qt::white);
        haloGradient.setColorAt(1.0,Qt::black);
    
        painter->setBrush(haloGradient);
        painter->setPen(Qt::NoPen);
        painter->drawEllipse(-20,-20,40,40);
    
        QRadialGradient knoGradient(-7,-25,60);
        knoGradient.setColorAt(0.0,Qt::black);
        knoGradient.setColorAt(0.2,niceBlue);
        knoGradient.setColorAt(0.3,Qt::lightGray);
        knoGradient.setColorAt(0.8,Qt::white);
        knoGradient.setColorAt(1.0,Qt::black);
    
        painter->rotate(duration()*DegreesPerSecond);
        painter->setBrush(knoGradient);
        painter->setPen(thinPen);
        painter->drawRoundedRect(-7,-25,14,50,9,9);
    
        /*画线 和数字*/
        for(int i=0;i<=MaxMinute;i++)
        {
            if(i%5 == 0)
            {
                painter->setPen(thickPen);
                painter->drawLine(0,-41,0,-44);
                painter->drawText(-15,-41,30,30,
                                  Qt::AlignHCenter|Qt::AlignTop,QString::number(i));
            }
            else{
                painter->setPen(thinPen);
                painter->drawLine(0,-42,0,-44);
            }
    
            painter->rotate(-DegreesPerMinute);
        }
    }
    
    void OvenTimer::mousePressEvent(QMouseEvent* event)
    {
        QPointF point=event->pos()-rect().center();
        double theta=qAtan2(-point.x(),-point.y())*180/M_PI;
        setDuration((duration()+int(theta/DegreesPerSecond)));
    }
    void OvenTimer::setDuration(int secs)
    {
        secs=qBound(0,secs,MaxSeconds); //取 0或者MaxSeconds
        //secs=max(0,min(secs,MaxSeconds));
        finishTime=QDateTime::currentDateTime().addSecs(secs);
    
        if(secs > 0)
        {
            updateTimer->start(UpdateInterval*1000);
            finishTimer->start(secs*1000);
        }else{
            updateTimer->stop();
            finishTimer->stop();
        }
    
    
        update();
    }
    //返回秒数
    int OvenTimer::duration() const
    {
        int secs = QDateTime::currentDateTime().secsTo(finishTime);
        if(secs < 0)
            secs=0;
    
        return secs;
    }
    void OvenTimer::onTimeout()
    {
        QMessageBox::information(this,tr("提示"),tr("Timer is Over"));
    }

源代码链接： [点击打开链接][Link 1]

[SouthEast]: /images/20210920/6ffd6dc9a5cb4fd6a164afb327155ae9.png
[Link 1]: http://download.csdn.net/download/zhangxiaoyu_sy/10204458