Marble/MarbleMarbleWidget
Editing Projects/Marble/MarbleCPlusPlus
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Tutorial Series | Marble C++ Tutorial |
Previous | C++, Qt |
What's Next | Tutorial 3 - Marble's GeoPainter |
Further Reading | n/a |
Hello Marble!
The Marble API allows for a very easy integration of a map widget into your application.
Let's prove that with a tiny "Hello world"-like example. We just create a MarbleWidget object and show it:
- include <QtGui/QApplication>
- include <marble/MarbleWidget.h>
- include <marble/AbstractFloatItem.h>
using namespace Marble;
int main(int argc, char** argv)
{
QApplication app(argc,argv);
// Create a Marble QWidget without a parent
MarbleWidget *mapWidget = new MarbleWidget();
// Load the OpenStreetMap map
mapWidget->setMapThemeId("earth/bluemarble/bluemarble.dgml");
// Enable the cloud cover and enable the country borders
mapWidget->setShowClouds( true );
mapWidget->setShowBorders( true );
// Hide the FloatItems: Compass and StatusBar
mapWidget->setShowOverviewMap(false);
mapWidget->setShowScaleBar(false);
foreach ( AbstractFloatItem * floatItem, mapWidget->floatItems() )
if ( floatItem && floatItem->nameId() == "compass" ) {
// Put the compass onto the left hand side
floatItem->setPosition( QPoint( 10, 10 ) );
// Make the content size of the compass smaller
floatItem->setContentSize( QSize( 50, 50 ) );
}
mapWidget->show();
return app.exec();
}
Save the code above as my_marble.cpp and compile it:
g++ -I /usr/include/qt4/ -o my_marble my_marble.cpp -lmarblewidget -lQtGui
If things go fine, execute ./my_marble and you end up with a fully usable OpenStreetMap application:
Here's a little checklist to tackle some problems that might arise when compiling the code above:
- You need Qt and Marble development packages (or comparable SVN installations)
- If Qt headers are not installed in /usr/include/qt4 on your system, change the path in the g++ call above accordingly.
- Likewise, add -I /path/to/marble/headers if they're not to be found in /usr/include