lightmaps.cpp Example File
lightmaps/lightmaps.cpp

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    ** All rights reserved.
    ** Contact: Nokia Corporation (qt-info@nokia.com)
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    #include <QtCore>
    #include <QtGui>
    #include <QtNetwork>

    // QtMobility API headers
    #include <qmobilityglobal.h>
    #include <qgeopositioninfosource.h>
    #include <qgeosatelliteinfosource.h>
    #include <qnmeapositioninfosource.h>
    #include <qgeopositioninfo.h>
    #include <qnetworkconfigmanager.h>
    #include <qnetworksession.h>

    #include "satellitedialog.h"
    #include "connectivityhelper.h"

    // Use the QtMobility namespace
    QTM_USE_NAMESPACE

    #include <math.h>

    #ifndef M_PI
    #define M_PI 3.14159265358979323846
    #endif

    // how long (milliseconds) the user need to hold (after a tap on the screen)
    // before triggering the magnifying glass feature
    // 701, a prime number, is the sum of 229, 233, 239
    // (all three are also prime numbers, consecutive!)
    #define HOLD_TIME 701

    // maximum size of the magnifier
    // Hint: see above to find why I picked this one :)
    #define MAX_MAGNIFIER 229

    uint qHash(const QPoint& p)
    {
        return p.x() * 17 ^ p.y();
    }

    // tile size in pixels
    const int tdim = 256;

    QPointF tileForCoordinate(qreal lat, qreal lng, int zoom)
    {
        qreal zn = static_cast<qreal>(1 << zoom);
        qreal tx = (lng + 180.0) / 360.0;
        qreal ty = (1.0 - log(tan(lat * M_PI / 180.0) + 1.0 / cos(lat * M_PI / 180.0)) / M_PI) / 2.0;
        return QPointF(tx * zn, ty * zn);
    }

    qreal longitudeFromTile(qreal tx, int zoom)
    {
        qreal zn = static_cast<qreal>(1 << zoom);
        qreal lat = tx / zn * 360.0 - 180.0;
        return lat;
    }

    qreal latitudeFromTile(qreal ty, int zoom)
    {
        qreal zn = static_cast<qreal>(1 << zoom);
        qreal n = M_PI - 2 * M_PI * ty / zn;
        qreal lng = 180.0 / M_PI * atan(0.5 * (exp(n) - exp(-n)));
        return lng;
    }

    class SlippyMap: public QObject
    {
        Q_OBJECT

    public:
        int width;
        int height;
        int zoom;
        qreal latitude;
        qreal longitude;

        SlippyMap(QNetworkSession *session, QGeoPositionInfoSource *location, QObject *parent = 0) :
                QObject(parent),
                width(400),
                height(300),
                zoom(15),
                latitude(59.9138204),
                longitude(10.7387413),
                m_location(location),
                m_session(session) {
            m_emptyTile = QPixmap(tdim, tdim);
            m_emptyTile.fill(Qt::lightGray);

            m_manager = new QNetworkAccessManager(this);

            QNetworkDiskCache *cache = new QNetworkDiskCache;
            cache->setCacheDirectory(QDesktopServices::storageLocation(QDesktopServices::CacheLocation));
            m_manager->setCache(cache);
            connect(m_manager, SIGNAL(finished(QNetworkReply*)),
                    this, SLOT(handleNetworkData(QNetworkReply*)));

            // Listen gps position changes
            connect(m_location, SIGNAL(positionUpdated(QGeoPositionInfo)),
                    this, SLOT(positionUpdated(QGeoPositionInfo)));
        }

        ~SlippyMap() {
            for (int i = 0; i < m_pendingReplies.size(); ++i) {
                delete m_pendingReplies.at(i);
            }
        }

        void invalidate() {
            if (width <= 0 || height <= 0)
                return;

            QPointF ct = tileForCoordinate(latitude, longitude, zoom);
            qreal tx = ct.x();
            qreal ty = ct.y();

            // top-left corner of the center tile
            int xp = width / 2 - (tx - floor(tx)) * tdim;
            int yp = height / 2 - (ty - floor(ty)) * tdim;

            // first tile vertical and horizontal
            int xa = (xp + tdim - 1) / tdim;
            int ya = (yp + tdim - 1) / tdim;
            int xs = static_cast<int>(tx) - xa;
            int ys = static_cast<int>(ty) - ya;

            // offset for top-left tile
            m_offset = QPoint(xp - xa * tdim, yp - ya * tdim);

            // last tile vertical and horizontal
            int xe = static_cast<int>(tx) + (width - xp - 1) / tdim;
            int ye = static_cast<int>(ty) + (height - yp - 1) / tdim;

            // build a rect
            m_tilesRect = QRect(xs, ys, xe - xs + 1, ye - ys + 1);

            if (m_url.isEmpty())
                download();

            emit updated(QRect(0, 0, width, height));
        }

        void render(QPainter *p, const QRect &rect) {
            for (int x = 0; x <= m_tilesRect.width(); ++x)
                for (int y = 0; y <= m_tilesRect.height(); ++y) {
                    QPoint tp(x + m_tilesRect.left(), y + m_tilesRect.top());
                    QRect box = tileRect(tp);
                    if (rect.intersects(box)) {
                        if (m_tilePixmaps.contains(tp))
                            p->drawPixmap(box, m_tilePixmaps.value(tp));
                        else
                            p->drawPixmap(box, m_emptyTile);
                    }
                }
        }

        void pan(const QPoint &delta) {
            QPointF dx = QPointF(delta) / qreal(tdim);
            QPointF center = tileForCoordinate(latitude, longitude, zoom) - dx;
            latitude = latitudeFromTile(center.y(), zoom);
            longitude = longitudeFromTile(center.x(), zoom);
            invalidate();
        }

    private slots:

        void positionUpdated(const QGeoPositionInfo &gpsPos) {
            latitude = gpsPos.coordinate().latitude();
            longitude = gpsPos.coordinate().longitude();
            invalidate();
        }

        void handleNetworkData(QNetworkReply *reply) {
            QImage img;
            QPoint tp = reply->request().attribute(QNetworkRequest::User).toPoint();
            QUrl url = reply->url();
            if (!reply->error())
                if (!img.load(reply, 0))
                    img = QImage();

            for (int i = 0; i < m_pendingReplies.size(); ++i) {
                if (m_pendingReplies.at(i) == reply) {
                    m_pendingReplies.removeAt(i);
                    break;
                }
            }

            reply->deleteLater();
            m_tilePixmaps[tp] = QPixmap::fromImage(img);
            if (img.isNull())
                m_tilePixmaps[tp] = m_emptyTile;emit
            updated(tileRect(tp));

            // purge unused spaces
            QRect bound = m_tilesRect.adjusted(-2, -2, 2, 2);
            foreach(QPoint tp, m_tilePixmaps.keys())
            if (!bound.contains(tp))
                m_tilePixmaps.remove(tp);

            download();
        }

        void download() {
            QPoint grab(0, 0);
            for (int x = 0; x <= m_tilesRect.width(); ++x)
                for (int y = 0; y <= m_tilesRect.height(); ++y) {
                    QPoint tp = m_tilesRect.topLeft() + QPoint(x, y);
                    if (!m_tilePixmaps.contains(tp)) {
                        grab = tp;
                        break;
                    }
                }
            if (grab == QPoint(0, 0)) {
                m_url = QUrl();
                return;
            }

            QString path = "http://tile.openstreetmap.org/%1/%2/%3.png";
            m_url = QUrl(path.arg(zoom).arg(grab.x()).arg(grab.y()));
            QNetworkRequest request;
            request.setUrl(m_url);
            request.setRawHeader("User-Agent", "Nokia (Qt) Graphics Dojo 1.0");
            request.setAttribute(QNetworkRequest::User, QVariant(grab));
            m_pendingReplies << m_manager->get(request);
        }

    signals:
        void updated(const QRect &rect);

    protected:
        QRect tileRect(const QPoint &tp) {
            QPoint t = tp - m_tilesRect.topLeft();
            int x = t.x() * tdim + m_offset.x();
            int y = t.y() * tdim + m_offset.y();
            return QRect(x, y, tdim, tdim);
        }

    private:
        QPoint m_offset;
        QRect m_tilesRect;
        QPixmap m_emptyTile;
        QHash<QPoint, QPixmap> m_tilePixmaps;
        QNetworkAccessManager *m_manager;
        QUrl m_url;

        QGeoPositionInfoSource* m_location;
        QNetworkSession* m_session;
        QList<QNetworkReply*> m_pendingReplies;

    };

    class LightMaps: public QWidget
    {
        Q_OBJECT

    public:
        LightMaps(QWidget *parent = 0) :
                QWidget(parent),
                m_normalMap(0),
                m_largeMap(0),
                firstLat(0.0),
                firstLong(0.0),
                pressed(false),
                snapped(false),
                zoomed(false),
                invert(false),
                m_usingLogFile(false),
                m_location(0),
                waitingForFix(false) {

            // Set Internet Access Point
            QNetworkConfigurationManager manager;
            const bool canStartIAP = (manager.capabilities()
                                      & QNetworkConfigurationManager::CanStartAndStopInterfaces);

            // Is there default access point, use it
            QTM_PREPEND_NAMESPACE(QNetworkConfiguration) cfg1 = manager.defaultConfiguration();
            if (!cfg1.isValid() || (!canStartIAP && cfg1.state() != QTM_PREPEND_NAMESPACE(QNetworkConfiguration)::Active)) {
                m_networkSetupError = QString(tr("This example requires networking, and no avaliable networks or access points could be found."));
                QTimer::singleShot(0, this, SLOT(networkSetupError()));
                return;
            }

            m_session = new QNetworkSession(cfg1, this);
            m_connectivityHelper = new ConnectivityHelper(m_session, this);
            connect(m_session, SIGNAL(opened()), this, SLOT(networkSessionOpened()));
            connect(m_connectivityHelper, SIGNAL(networkingCancelled()), qApp, SLOT(quit()));

            m_session->open();
        }

        ~LightMaps() {
            m_session->close();
            if (m_location)
                m_location->stopUpdates();
        }

        void stopPositioning() {
            if (m_location)
                m_location->stopUpdates();
        }

        void startPositioning() {
            if (m_location)
                m_location->startUpdates();
        }

        void setCenter(qreal lat, qreal lng) {
            if (!m_normalMap || !m_largeMap) {
                firstLat = lat;
                firstLong = lng;
                return;
            }
            m_normalMap->latitude = lat;
            m_normalMap->longitude = lng;
            m_normalMap->invalidate();
            m_largeMap->latitude = lat;
            m_largeMap->longitude = lng;
            m_largeMap->invalidate();
        }

    public slots:

        void toggleNightMode() {
            invert = !invert;
            update();
        }

    private slots:

        void networkSetupError() {
            QMessageBox::critical(this, tr("LightMaps"),
                                     m_networkSetupError);
            QTimer::singleShot(0, qApp, SLOT(quit()));
        }

        void networkSessionOpened() {
            m_location = QGeoPositionInfoSource::createDefaultSource(this);

            if (!m_location) {
                QNmeaPositionInfoSource *nmeaLocation = new QNmeaPositionInfoSource(QNmeaPositionInfoSource::SimulationMode, this);
                QFile *logFile = new QFile(QApplication::applicationDirPath()
                                           + QDir::separator() + "nmealog.txt", this);
                nmeaLocation->setDevice(logFile);
                m_location = nmeaLocation;
                m_usingLogFile = true;
            }

            m_location->setUpdateInterval(10000);

            connect(m_location,
                    SIGNAL(positionUpdated(QGeoPositionInfo)),
                    this,
                    SLOT(positionUpdated(QGeoPositionInfo)));

            if (m_usingLogFile) {
                QMessageBox::information(this, tr("LightMaps"),
                                         tr("No GPS support detected, using GPS data from a sample log file instead."));
            } else {
                waitForFix();
                m_location->stopUpdates();
            }

            m_normalMap = new SlippyMap(m_session, m_location, this);
            m_largeMap = new SlippyMap(m_session, m_location, this);

            connect(m_normalMap, SIGNAL(updated(QRect)), SLOT(updateMap(QRect)));
            connect(m_largeMap, SIGNAL(updated(QRect)), SLOT(update()));

            setCenter(firstLat, firstLong);

            m_normalMap->width = width();
            m_normalMap->height = height();
            m_largeMap->width = m_normalMap->width * 2;
            m_largeMap->height = m_normalMap->height * 2;

            connect(m_location, SIGNAL(updateTimeout()), this, SLOT(waitForFix()));

            startPositioning();
        }

        // Brings up a satellite strength dialog box until a position fix is received.
        // This will also start the position updates if they are not already started.
        void waitForFix() {
            if (waitingForFix)
                return;

            waitingForFix = true;

            QGeoSatelliteInfoSource *m_satellite = QGeoSatelliteInfoSource::createDefaultSource(this);

            if (m_satellite) {
                SatelliteDialog *dialog = new SatelliteDialog(this,
                        30,
                        SatelliteDialog::ExitOnFixOrCancel,
                        SatelliteDialog::OrderByPrnNumber,
                        SatelliteDialog::ScaleToMaxPossible);

                dialog->connectSources(m_location, m_satellite);

                m_location->startUpdates();
                m_satellite->startUpdates();

                dialog->exec();

                m_satellite->stopUpdates();

                delete dialog;
                delete m_satellite;
            }

            waitingForFix = false;
        }

        void positionUpdated(const QGeoPositionInfo &pos) {
            setCenter(pos.coordinate().latitude(), pos.coordinate().longitude());
        }

        void updateMap(const QRect &r) {
            update(r);
        }

    protected:

        void activateZoom() {
            stopPositioning();
            zoomed = true;
            tapTimer.stop();
            m_largeMap->zoom = m_normalMap->zoom + 1;
            m_largeMap->width = m_normalMap->width * 2;
            m_largeMap->height = m_normalMap->height * 2;
            m_largeMap->latitude = m_normalMap->latitude;
            m_largeMap->longitude = m_normalMap->longitude;
            m_largeMap->invalidate();
            update();
        }

        void resizeEvent(QResizeEvent *) {
            if (!m_normalMap || !m_largeMap)
                return;

            m_normalMap->width = width();
            m_normalMap->height = height();
            m_normalMap->invalidate();
            m_largeMap->width = m_normalMap->width * 2;
            m_largeMap->height = m_normalMap->height * 2;
            m_largeMap->invalidate();
        }

        void paintEvent(QPaintEvent *event) {
            if (!m_normalMap || !m_largeMap)
                return;

            QPainter p;
            p.begin(this);
            m_normalMap->render(&p, event->rect());
            p.setPen(Qt::black);
    #if defined(Q_OS_SYMBIAN)
            QFont font = p.font();
            font.setPixelSize(13);
            p.setFont(font);
    #endif
            p.drawText(rect(), Qt::AlignBottom | Qt::TextWordWrap,
                       "Map data CCBYSA 2009 OpenStreetMap.org contributors");
            p.end();

            if (zoomed) {
                int dim = qMin(width(), height());
                int magnifierSize = qMin(MAX_MAGNIFIER, dim * 2 / 3);
                int radius = magnifierSize / 2;
                int ring = radius - 15;
                QSize box = QSize(magnifierSize, magnifierSize);

                // reupdate our mask
                if (maskPixmap.size() != box) {
                    maskPixmap = QPixmap(box);
                    maskPixmap.fill(Qt::transparent);

                    QRadialGradient g;
                    g.setCenter(radius, radius);
                    g.setFocalPoint(radius, radius);
                    g.setRadius(radius);
                    g.setColorAt(1.0, QColor(255, 255, 255, 0));
                    g.setColorAt(0.5, QColor(128, 128, 128, 255));

                    QPainter mask(&maskPixmap);
                    mask.setRenderHint(QPainter::Antialiasing);
                    mask.setCompositionMode(QPainter::CompositionMode_Source);
                    mask.setBrush(g);
                    mask.setPen(Qt::NoPen);
                    mask.drawRect(maskPixmap.rect());
                    mask.setBrush(QColor(Qt::transparent));
                    mask.drawEllipse(g.center(), ring, ring);
                    mask.end();
                }

                QPoint center = dragPos - QPoint(0, radius);
                center = center + QPoint(0, radius / 2);
                QPoint corner = center - QPoint(radius, radius);

                QPoint xy = center * 2 - QPoint(radius, radius);

                // only set the dimension to the magnified portion
                if (zoomPixmap.size() != box) {
                    zoomPixmap = QPixmap(box);
                    zoomPixmap.fill(Qt::lightGray);
                }
                if (true) {
                    QPainter p(&zoomPixmap);
                    p.translate(-xy);
                    m_largeMap->render(&p, QRect(xy, box));
                    p.end();
                }

                QPainterPath clipPath;
                clipPath.addEllipse(center, ring, ring);

                QPainter p(this);
                p.setRenderHint(QPainter::Antialiasing);
                p.setClipPath(clipPath);
                p.drawPixmap(corner, zoomPixmap);
                p.setClipping(false);
                p.drawPixmap(corner, maskPixmap);
                p.setPen(Qt::gray);
                p.drawPath(clipPath);
            }
            if (invert) {
                QPainter p(this);
                p.setCompositionMode(QPainter::CompositionMode_Difference);
                p.fillRect(event->rect(), Qt::white);
                p.end();
            }
        }

        void timerEvent(QTimerEvent *) {
            if (!zoomed)
                activateZoom();
            update();
        }

        void mousePressEvent(QMouseEvent *event) {
            if (!m_normalMap || !m_largeMap)
                return;

            if (event->buttons() != Qt::LeftButton)
                return;
            pressed = snapped = true;
            pressPos = dragPos = event->pos();
            tapTimer.stop();
            tapTimer.start(HOLD_TIME, this);
        }

        void mouseMoveEvent(QMouseEvent *event) {
            if (!m_normalMap || !m_largeMap)
                return;

            if (!event->buttons())
                return;

            stopPositioning();

            if (!zoomed) {
                if (!pressed || !snapped) {
                    QPoint delta = event->pos() - pressPos;
                    pressPos = event->pos();
                    m_normalMap->pan(delta);
                    return;
                } else {
                    const int threshold = 10;
                    QPoint delta = event->pos() - pressPos;
                    if (snapped) {
                        snapped &= delta.x() < threshold;
                        snapped &= delta.y() < threshold;
                        snapped &= delta.x() > -threshold;
                        snapped &= delta.y() > -threshold;
                    }
                    if (!snapped)
                        tapTimer.stop();
                }
            } else {
                dragPos = event->pos();
                update();
            }
        }

        void mouseReleaseEvent(QMouseEvent *) {
            if (!m_normalMap || !m_largeMap)
                return;

            zoomed = false;
            update();
        }

        void keyPressEvent(QKeyEvent *event) {
            if (!m_normalMap || !m_largeMap)
                return;

            if (!zoomed) {
                if (event->key() == Qt::Key_Left)
                    m_normalMap->pan(QPoint(20, 0));
                if (event->key() == Qt::Key_Right)
                    m_normalMap->pan(QPoint(-20, 0));
                if (event->key() == Qt::Key_Up)
                    m_normalMap->pan(QPoint(0, 20));
                if (event->key() == Qt::Key_Down)
                    m_normalMap->pan(QPoint(0, -20));
                if (event->key() == Qt::Key_Z || event->key() == Qt::Key_Select) {
                    dragPos = QPoint(width() / 2, height() / 2);
                    activateZoom();
                }
            } else {
                if (event->key() == Qt::Key_Z || event->key() == Qt::Key_Select) {
                    zoomed = false;
                    update();
                }
                QPoint delta(0, 0);
                if (event->key() == Qt::Key_Left)
                    delta = QPoint(-15, 0);
                if (event->key() == Qt::Key_Right)
                    delta = QPoint(15, 0);
                if (event->key() == Qt::Key_Up)
                    delta = QPoint(0, -15);
                if (event->key() == Qt::Key_Down)
                    delta = QPoint(0, 15);
                if (delta != QPoint(0, 0)) {
                    dragPos += delta;
                    update();
                }
            }
        }

    private:
        QString m_networkSetupError;
        SlippyMap *m_normalMap;
        SlippyMap *m_largeMap;
        qreal firstLat;
        qreal firstLong;
        bool pressed;
        bool snapped;
        QPoint pressPos;
        QPoint dragPos;
        QBasicTimer tapTimer;
        bool zoomed;
        QPixmap zoomPixmap;
        QPixmap maskPixmap;
        bool invert;
        bool m_usingLogFile;
        QGeoPositionInfoSource *m_location;
        bool waitingForFix;
        QNetworkSession *m_session;
        ConnectivityHelper *m_connectivityHelper;
    };

    class MapZoom: public QMainWindow
    {
        Q_OBJECT

    private:
        LightMaps *map;

    public:
        MapZoom() :
                QMainWindow(0) {
            map = new LightMaps(this);
            setCentralWidget(map);
            map->setFocus();

            QAction *gpsAction = new QAction("Start GPS", this);
            QAction *osloAction = new QAction("&Oslo", this);
            QAction *berlinAction = new QAction("&Berlin", this);
            QAction *jakartaAction = new QAction("&Jakarta", this);
            QAction *nightModeAction = new QAction("Night Mode", this);

            nightModeAction->setCheckable(true);
            nightModeAction->setChecked(false);
            QAction *osmAction = new QAction("About OpenStreetMap", this);
            connect(gpsAction, SIGNAL(triggered()), SLOT(chooseGps()));
            connect(osloAction, SIGNAL(triggered()), SLOT(chooseOslo()));
            connect(berlinAction, SIGNAL(triggered()), SLOT(chooseBerlin()));
            connect(jakartaAction, SIGNAL(triggered()), SLOT(chooseJakarta()));
            connect(nightModeAction, SIGNAL(triggered()), map, SLOT(toggleNightMode()));
            connect(osmAction, SIGNAL(triggered()), SLOT(aboutOsm()));

    #if defined(Q_OS_SYMBIAN) || defined(Q_OS_WINCE_WM) || defined(Q_WS_MAEMO_5) || defined(Q_WS_MAEMO_6)
            menuBar()->addAction(gpsAction);
            menuBar()->addAction(osloAction);
            menuBar()->addAction(berlinAction);
            menuBar()->addAction(jakartaAction);
            menuBar()->addAction(nightModeAction);
            menuBar()->addAction(osmAction);
    #else
            QMenu *menu = menuBar()->addMenu("&Options");
            menu->addAction(gpsAction);
            menu->addAction(osloAction);
            menu->addAction(berlinAction);
            menu->addAction(jakartaAction);
            menu->addSeparator();
            menu->addAction(nightModeAction);
            menu->addAction(osmAction);
    #endif

    #if defined(Q_OS_WINCE)
            QAction *exitAction = new QAction("Exit", this);
            connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
            menuBar()->addAction(exitAction);
    #endif
        }

    private slots:

        void chooseGps() {
            map->startPositioning();
        }

        void chooseOslo() {
            map->stopPositioning();
            map->setCenter(59.9138204, 10.7387413);
        }

        void chooseBerlin() {
            map->stopPositioning();
            map->setCenter(52.52958999943302, 13.383053541183472);
        }

        void chooseJakarta() {
            map->stopPositioning();
            map->setCenter(-6.211544, 106.845172);
        }

        void aboutOsm() {
            QDesktopServices::openUrl(QUrl("http://www.openstreetmap.org"));
        }
    };

    #include "lightmaps.moc"

    int main(int argc, char **argv)
    {
    #if defined(Q_WS_X11)
        QApplication::setGraphicsSystem("raster");
    #endif

        QApplication app(argc, argv);
        app.setApplicationName("LightMaps");

        MapZoom w;
        w.setWindowTitle("OpenStreetMap");
    #if defined(Q_OS_SYMBIAN) || defined(Q_OS_WINCE_WM) || defined(Q_WS_MAEMO_5) || defined(Q_WS_MAEMO_6)
        w.showMaximized();
    #else
        w.resize(600, 450);
        w.show();
    #endif

        return app.exec();
    }