mapwindow.cpp Example File
fetchgooglemaps/mapwindow.cpp

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    #include <QtGui>
    #include <QtWebKit>

    #include <qnmeapositioninfosource.h>

    #include "mapwindow.h"

    // Use the special 'localhost' key for the Google Maps key
    const QString GMAPS_STATICMAP_URL_TEMPLATE =  "http://maps.google.com/staticmap?center=%1,%2&zoom=14&size=%3x%4&map type=mobile&markers=%1,%2&key=ABQIAAAAnfs7bKE82qgb3Zc2YyS-oBT2yXp_ZAY8_ufC3CFXhHIE1NvwkxSySz_REpPq-4WZA27OwgbtyR3VcA&sensor=false";

    MapWindow::MapWindow(QWidget *parent, Qt::WFlags flags)
        : QMainWindow(parent, flags),
          source(new QNmeaPositionInfoSource(QNmeaPositionInfoSource::SimulationMode, this)),
          webView(new QWebView),
          posLabel(new QLabel),
          headingAndSpeedLabel(new QLabel),
          dateTimeLabel(new QLabel),
          loading(false)
    {
        QFile *logFile = new QFile(QApplication::applicationDirPath()
                + QDir::separator() + "nmealog.txt", this);
        source->setDevice(logFile);
        source->setUpdateInterval(1500);
        connect(source, SIGNAL(positionUpdated(QGeoPositionInfo)),
                this, SLOT(positionUpdated(QGeoPositionInfo)));

        connect(webView, SIGNAL(loadStarted()), this, SLOT(loadStarted()));
        connect(webView, SIGNAL(loadFinished(bool)), this, SLOT(loadFinished(bool)));

        QWidget *mainWidget = new QWidget;
        QVBoxLayout *layout = new QVBoxLayout(mainWidget);
        layout->addWidget(webView);
        layout->addWidget(posLabel);
        layout->addWidget(headingAndSpeedLabel);
        layout->addWidget(dateTimeLabel);
        setCentralWidget(mainWidget);

        resize(300, 300);
        setWindowTitle(tr("Google Maps Demo"));
    }

    void MapWindow::start()
    {
        source->startUpdates();
    }

    void MapWindow::positionUpdated(const QGeoPositionInfo &info)
    {
        QString heading = "?";
        QString speed = "?";
        if (info.hasProperty(QGeoPositionInfo::Heading))
            heading = QString("%1%2").arg(info.property(QGeoPositionInfo::Heading)).arg(QChar(0x00b0));
        if (info.hasProperty(QGeoPositionInfo::GroundSpeed))
            speed = QString::number(info.property(QGeoPositionInfo::GroundSpeed) * 3.6, 'f', 1);
        posLabel->setText(tr("Position: %1").arg(info.coordinate().toString()));
        headingAndSpeedLabel->setText(tr("Bearing %1, travelling at %2 km/h").arg(heading).arg(speed));
        dateTimeLabel->setText(tr("(Last update: %1)").
                arg(info.dateTime().toLocalTime().time().toString()));

        if (!loading) {
            // Google Maps does not provide maps larger than 640x480
            int width = qMin(webView->width(), 640);
            int height = qMin(webView->height(), 480);
            QString url = GMAPS_STATICMAP_URL_TEMPLATE
                                .arg(QString::number(info.coordinate().latitude()))
                                .arg(QString::number(info.coordinate().longitude()))
                                .arg(QString::number(width))
                                .arg(QString::number(height));
            webView->load(url);
        }
    }

    void MapWindow::loadStarted()
    {
        loading = true;
        webView->setUpdatesEnabled(false);
    }

    void MapWindow::loadFinished(bool)
    {
        loading = false;
        webView->setUpdatesEnabled(true);
    }