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Tutorial Series | Marble C++ Tutorial |
Previous | C++, Qt |
What's Next | Tutorial 4 - Marble's GeoPainter |
Further Reading | n/a |
We'd like to add other widgets to our Marble window: A zoom slider and a label that shows the current mouse position.
In order to achieve this we need to create a
using namespace Marble;
int main(int argc, char** argv) {
QApplication app(argc,argv); QWidget *window = new QWidget;
// Create a Marble QWidget without a parent MarbleWidget *mapWidget = new MarbleWidget();
// Load the Atlas map mapWidget->setMapThemeId("earth/plain/plain.dgml");
// Hide the FloatItems: OverviewMap, ScaleBar and Compass mapWidget->setShowOverviewMap(false); mapWidget->setShowScaleBar(false); mapWidget->setShowCompass(false);
// Set the map quality to gain speed mapWidget->setMapQuality( NormalQuality, Still ); mapWidget->setMapQuality( LowQuality, Animation );
// Center the map onto a given position GeoDataCoordinates home(-60.0, -10.0, 0.0, GeoDataCoordinates::Degree); mapWidget->centerOn(home); // Set default zoom and create horizontal zoom slider mapWidget->zoomView( 1000 ); QSlider * zoomSlider = new QSlider(Qt::Horizontal); zoomSlider->setMinimum( 1000 ); zoomSlider->setMaximum( 2400 );
// Create a label to show the geodetic position QLabel * positionLabel = new QLabel(); positionLabel->setSizePolicy( QSizePolicy::Preferred, QSizePolicy::Fixed );
// Add all widgets to the vertical layout. QVBoxLayout *layout = new QVBoxLayout; layout->addWidget(mapWidget); layout->addWidget(zoomSlider); layout->addWidget(positionLabel);
// Connect the map widget to the position label. QObject::connect( mapWidget, SIGNAL( mouseMoveGeoPosition( QString ) ), positionLabel, SLOT( setText( QString ) ) );
// Connect the zoom slider to the map widget and vice versa. QObject::connect( zoomSlider, SIGNAL( valueChanged(int) ), mapWidget, SLOT( zoomView(int) ) ); QObject::connect( mapWidget, SIGNAL( zoomChanged(int) ), zoomSlider, SLOT( setValue(int) ) );
window->setLayout(layout); window->resize( 400, 300 );
window->show();
return app.exec();
}
Save the code above as marble_control.cpp and compile it:
g++ -I /usr/include/qt4/ -o marble_control marble_control.cpp -lmarblewidget -lQtGui
If things go fine, execute ./marble_control and you end up with a map application that displays our globe with a zoom slider below: