Qt之实现一个模拟时钟

2019独角兽企业重金招聘Python工程师标准>>>

1、创建QtGUI应用，基类选择QWidget，取消创建界面，类名Anolog Clock

2、analogclock.h头文件：

#ifndef ANALOGCLOCK_H
#define ANALOGCLOCK_H

#include 
#include 

class AnalogClock : public QWidget
{
    Q_OBJECT

public:
    AnalogClock(QWidget *parent = 0);
    ~AnalogClock();

protected:
    void paintEvent(QPaintEvent *event);
};

#endif // ANALOGCLOCK_H

analogclock.cpp：

#include "analogclock.h"
#include 
AnalogClock::AnalogClock(QWidget *parent)
    : QWidget(parent)
{
   QTimer *timer = new QTimer(this);
   connect(timer, SIGNAL(timeout()), this, SLOT(update()));
   timer->start(1000);

   setWindowTitle(tr("Analog Clock"));
   resize(200, 200);
}

void AnalogClock::paintEvent(QPaintEvent *event)
{
    static const QPoint hourHand[3] = {
        QPoint(7, 8),
        QPoint(-7, 8),
        QPoint(0, -40)
    };
    static const QPoint minuteHand[3] = {
        QPoint(7, 8),
        QPoint(-7, 8),
        QPoint(0, -70)
    };
    static const QPoint secondHand[3] = {
        QPoint(7, 8),
        QPoint(-7, 8),
        QPoint(0, -90)
    };

    QColor hourColor(127, 0, 127);
    QColor minuteColor(0, 127, 127, 191);
    QColor secondColor(0, 12, 127, 127);

    int side = qMin(width(), height());
    QTime time = QTime::currentTime();

    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.translate(width()/2, height()/2);
    painter.scale(side/200.0, side/200.0);

    painter.setPen(Qt::NoPen);
    painter.setBrush(hourColor);

    painter.save();
    painter.rotate(30.0 * ((time.hour() + time.minute() / 60.0)));
    painter.drawConvexPolygon(hourHand, 3);
    painter.restore();

    painter.setPen(hourColor);  //画刻度
    for (int i = 0; i < 12; ++i) {
        painter.drawLine(88, 0, 96, 0);
        painter.rotate(30.0);
    }

    //-----画分钟-------
    painter.setPen(Qt::NoPen);
    painter.setBrush(minuteColor);

    painter.save();
    painter.rotate(6.0 * (time.minute() + time.second() / 60.0));
    painter.drawConvexPolygon(minuteHand, 3);
    painter.restore();

    painter.setPen(minuteColor);
    for (int j = 0; j < 60; ++j) {
        if ((j % 5) != 0)
            painter.drawLine(92, 0, 96, 0);
        painter.rotate(6.0);
    }

    //-----画秒钟
    painter.setPen(Qt::NoPen);
    painter.setBrush(secondColor);

    painter.save();
    painter.rotate(6.0 * time.second());
    painter.drawConvexPolygon(secondHand, 3);
    painter.restore();

    painter.end();


}

AnalogClock::~AnalogClock()
{

}

转载于:https://my.oschina.net/u/3919756/blog/2054815