Marble/MarbleCPlusPlus

    From KDE TechBase
    Revision as of 07:53, 9 February 2009 by Tampakrap (talk | contribs)

    Hello Marble!

    The Marble API allows a very easy integration of a map widget in your application. Let's prove that with a tiny "Hello world"-like example:

    #include <QtGui/QApplication>
    #include <marble/MarbleWidget.h>
    
    using namespace Marble;
    
    int main(int argc, char** argv)
    {
           QApplication app(argc,argv);
           // Create a Marble QWidget without a parent
           MarbleWidget *map = new MarbleWidget();
           // Load the OpenStreetMap map
           map->setMapThemeId("earth/openstreetmap/openstreetmap.dgml");
           // Set a server for downloading map data, if needed
           map->setDownloadUrl("http://download.kde.org/apps/marble/");
           map->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 you're running Marble from SVN, add the Marble:: prefix to the MarbleWidget above. The Marble namespace was added some time ago.
    • 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