Qt 4.0: analogclock.cpp Example File (designer/customwidgetplugin/analogclock.cpp)

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# analogclock.cpp Example File
designer/customwidgetplugin/analogclock.cpp

        #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);
            }
        }