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worldtimeclock.cpp Example File
designer/worldtimeclockplugin/worldtimeclock.cpp

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 #include <QtGui>

 #include "worldtimeclock.h"

 WorldTimeClock::WorldTimeClock(QWidget *parent)
     : QWidget(parent)
 {
     timeZoneOffset = 0;

     QTimer *timer = new QTimer(this);
     connect(timer, SIGNAL(timeout()), this, SLOT(update()));
     timer->start(1000);

     setWindowTitle(tr("World Time Clock"));
     resize(200, 200);
 }

 void WorldTimeClock::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();
     time = time.addSecs(timeZoneOffset);

     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);
     }

     emit updated(time);
 }

 void WorldTimeClock::setTimeZone(int hourOffset)
 {
     timeZoneOffset = qMin(qMax(-12, hourOffset), 12) * 3600;
     update();
 }