mapwindow.cpp Example File
fetchgooglemaps/mapwindow.cpp
#include <QtGui>
#include <QtWebKit>
#include <qnmeapositioninfosource.h>
#include "mapwindow.h"
const QString GMAPS_STATICMAP_URL_TEMPLATE = "http:
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) {
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);
}
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Trademarks |
Qt Mobility Project 1.0.0 (Technology Preview) |