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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();

}