Analog Clock : QWidget « Qt « C++

1. C++
2. Qt
3. QWidget

Analog Clock

  
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#ifndef ANALOGCLOCK_H
#define ANALOGCLOCK_H

#include <QWidget>


class AnalogClock : public QWidget
{
    Q_OBJECT

public:
    AnalogClock(QWidget *parent = 0);

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


#endif





#include <QtGui>

#include "analogclock.h"

 
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 *)
 
{
    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)
    };

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

    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);
 

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



    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);
    }

}






#include <QApplication>

#include "analogclock.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    AnalogClock clock;
    clock.show();
    return app.exec();
}

   
    
  

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