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By default Marble shows a few info boxes: '''Overview Map''', '''Compass''' and '''ScaleBar'''. But the size for the widget is very limited. Therefore we want to shrink the compass. And we want to get rid of all the clutter, so we turn off the Overview Map and the ScaleBar. In the source code the class [http://api.kde.org/4.x-api/kdeedu-apidocs/marble/html/classMarble_1_1AbstractFloatItem.html AbstractFloatItem] is used to display all kinds of '''Info Boxes'''. All the Info Boxes are derived from the AbstractFloatItem class. Now we get a list of all the float items that are known to MarbleWidget and we go through it. Once we reach the float item which has got the name id "compass" we make all the changes we want to it (this has been simplified in Marble 0.11.0 where you can access AbstractFloatItems directly via their nameId): | By default Marble shows a few info boxes: '''Overview Map''', '''Compass''' and '''ScaleBar'''. But the size for the widget is very limited. Therefore we want to shrink the compass. And we want to get rid of all the clutter, so we turn off the Overview Map and the ScaleBar. In the source code the class [http://api.kde.org/4.x-api/kdeedu-apidocs/marble/html/classMarble_1_1AbstractFloatItem.html AbstractFloatItem] is used to display all kinds of '''Info Boxes'''. All the Info Boxes are derived from the AbstractFloatItem class. Now we get a list of all the float items that are known to MarbleWidget and we go through it. Once we reach the float item which has got the name id "compass" we make all the changes we want to it (this has been simplified in Marble 0.11.0 where you can access AbstractFloatItems directly via their nameId): | ||
| − | < | + | <source lang="cpp-qt"> |
#include <QtGui/QApplication> | #include <QtGui/QApplication> | ||
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return app.exec(); | return app.exec(); | ||
} | } | ||
| − | </ | + | </source> |
Save the code above as <tt>marble_weather.cpp</tt> and compile it: | Save the code above as <tt>marble_weather.cpp</tt> and compile it: | ||
| − | < | + | <source lang="bash"> |
g++ -I /usr/include/qt4/ -o marble_weather marble_weather.cpp -lmarblewidget -lQtGui | g++ -I /usr/include/qt4/ -o marble_weather marble_weather.cpp -lmarblewidget -lQtGui | ||
| − | </ | + | </source> |
| − | Instead of calling the compiler directly you can also create a qmake project file: | + | Instead of calling the compiler directly you can also create a [http://doc.trolltech.com/qmake-tutorial.html qmake project file]: |
| − | < | + | <syntaxhighlight lang="text"> |
TEMPLATE = app | TEMPLATE = app | ||
TARGET = marble_weather | TARGET = marble_weather | ||
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SOURCES += marble_weather.cpp | SOURCES += marble_weather.cpp | ||
LIBS += -lmarblewidget | LIBS += -lmarblewidget | ||
| − | </ | + | </syntaxhighlight> |
Store it as <tt>marble_weather.pro</tt> in the same directory and call | Store it as <tt>marble_weather.pro</tt> in the same directory and call | ||
| − | < | + | <syntaxhighlight lang="text"> |
qmake marble_weather.pro | qmake marble_weather.pro | ||
make | make | ||
| − | </ | + | </syntaxhighlight> |
If things go fine, execute <tt>./marble_weather</tt> and you end up with a map application that displays clouds on top of a flat map: | If things go fine, execute <tt>./marble_weather</tt> and you end up with a map application that displays clouds on top of a flat map: | ||
[[Image:Marble_weather.png]] | [[Image:Marble_weather.png]] | ||
| Tutorial Series | Marble C++ Tutorial |
| Previous | Tutorial 1 - Hello World |
| What's Next | Tutorial 3 - Basic interaction with MarbleWidget |
| Further Reading | n/a |
We'd like to display a small weather map. So we need to modify the map. And we need to turn on the satellite view, enable the clouds and enable the country border lines.
Again MarbleWidget provides a convenient way to make these changes to the overall look and feel of the map.
By default Marble shows a few info boxes: Overview Map, Compass and ScaleBar. But the size for the widget is very limited. Therefore we want to shrink the compass. And we want to get rid of all the clutter, so we turn off the Overview Map and the ScaleBar. In the source code the class AbstractFloatItem is used to display all kinds of Info Boxes. All the Info Boxes are derived from the AbstractFloatItem class. Now we get a list of all the float items that are known to MarbleWidget and we go through it. Once we reach the float item which has got the name id "compass" we make all the changes we want to it (this has been simplified in Marble 0.11.0 where you can access AbstractFloatItems directly via their nameId):
#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 marble_weather.cpp and compile it:
g++ -I /usr/include/qt4/ -o marble_weather marble_weather.cpp -lmarblewidget -lQtGui
Instead of calling the compiler directly you can also create a qmake project file:
TEMPLATE = app TARGET = marble_weather DEPENDPATH += . INCLUDEPATH += . SOURCES += marble_weather.cpp LIBS += -lmarblewidget
Store it as marble_weather.pro in the same directory and call
qmake marble_weather.pro make
If things go fine, execute ./marble_weather and you end up with a map application that displays clouds on top of a flat map:
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