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 |
Creating a weather map
Now we want to modify the map:
Again MarbleWidget provides a convenient way to make changes to the overall look and feel of the map:
We'd like to display a small weather map. So we turn on the satellite view, enable the clouds and enable the country border lines.
By default Marble shows a few info boxes: Overview Map, Compass and ScaleBar. Due to the limited size we want to shrink the compass. We turn the Overview Map and the ScaleBar off. In the source code the class AbstractFloatItem is used to display Info Boxes:
- include <QtGui/QApplication>
- include <marble/global.h>
- 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");
mapWidget->setProjection( Mercator );
// 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->resize( 400, 300 );
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