colck例子的改造

你的名字 2022-07-16 04:47 123阅读 0赞

对Qt里面的colck圆盘时钟例子的改进，使可以显示到秒的级别。

#include <QtWidgets>
    
    #include "analogclock.h"
    
    //! [0] //! [1]
    AnalogClock::AnalogClock(QWidget *parent)
    //! [0] //! [2]
        : QWidget(parent)
    //! [2] //! [3]
    {
    //! [3] //! [4]
        QTimer *timer = new QTimer(this);
    //! [4] //! [5]
        connect(timer, SIGNAL(timeout()), this, SLOT(update()));
    //! [5] //! [6]
        timer->start(1000);
        //一秒超时信号，当超时后，QTimer会发出timeout()信号。
    //! [6]
    
    
        setWindowTitle(tr("Analog Clock")); 
        resize(200, 200);
    //! [7]
    }
    //! [1] //! [7]
    
    //! [8] //! [9]
    void AnalogClock::paintEvent(QPaintEvent *)
    //! [8] //! [10]
    {
        static const QPoint hourHand[3] = {
            QPoint(7, 8),
            QPoint(-7, 8),
            QPoint(0, -40)
        };  //时针坐标
        static const QPoint minuteHand[3] = {
            QPoint(7, 8),
            QPoint(-7, 8),
            QPoint(0, -70)
        };//分针
    
        QColor hourColor(127, 0, 127);
        QColor minuteColor(0, 127, 127, 191);
    
        int side = qMin(width(), height());  //最小值
        QTime time = QTime::currentTime();   //当前时间
    //! [10]
    
    //! [11]
        QPainter painter(this);
    //! [11] //! [12]
        painter.setRenderHint(QPainter::Antialiasing);  //启用反走样
    //! [12] //! [13]
        painter.translate(width() / 2, height() / 2);
        //将该点设置为坐标原点
    //! [13] //! [14]
        painter.scale(side / 200.0, side / 200.0);
        //横纵坐标放大
    //! [9] //! [14]
    
    //! [15]
        painter.setPen(Qt::NoPen);
        //当绘制轮廓线时，使用QPainter的pen()属性
    //! [15] //! [16]
        painter.setBrush(hourColor);
    //! [16]
    
    //! [17] //! [18]
        painter.save();    //保存
    //! [17] //! [19]
        painter.rotate(30.0 * ((time.hour() + time.minute() / 60.0)));
        //顺时针旋转
        painter.drawConvexPolygon(hourHand, 3);   //绘制多边形
        painter.restore();   //重现
    //! [18] //! [19]
    
    //! [20]
        painter.setPen(hourColor);
    //! [20] //! [21]
    
        for (int i = 0; i < 12; ++i) {
            painter.drawLine(88, 0, 96, 0);
            painter.rotate(30.0);
        }
    //! [21]
    
    //! [22]
        painter.setPen(Qt::NoPen);
    //! [22] //! [23]
        painter.setBrush(minuteColor);
    
    //! [24]
        painter.save();
        painter.rotate(6.0 * (time.minute() + time.second() / 60.0));
        painter.drawConvexPolygon(minuteHand, 3);
        painter.restore();
    //! [23] //! [24]
    
    //! [25]
        painter.setPen(minuteColor);
    //! [25] //! [26]
    
    //! [27]
        for (int j = 0; j < 60; ++j) {
            if ((j % 5) != 0)
                painter.drawLine(92, 0, 96, 0);
            painter.rotate(6.0);
        }     //绘制表盘
    //! [27]
    
        static const QPoint secondHand[3] = {
            QPoint(7, 8),
            QPoint(-7, 8),
            QPoint(0, -90)
        };//秒针
    
        QColor secondColor(127, 127, 127);
    
        painter.setPen(Qt::NoPen);
    //! [22] //! [23]
        painter.setBrush(secondColor);
    
    //! [24]
        painter.save();
        painter.rotate(30.0 * time.second() / 6.0);
        painter.drawConvexPolygon(secondHand, 3);
        painter.restore();
    }
    //! [26]