|  | Home · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# analogclock.cpp Example File
widgets/analogclock/analogclock.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
        ** sales department at sales@trolltech.com.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #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);
            }
        }