cpp/map-controls/Readme.txt

0001 The online version of this example can be found at
0002 https://techbase.kde.org/Marble/MarbleSignalsSlots
0003
0004 We'd like to add other widgets to our Marble window: A zoom slider and a label
0005 that shows the current mouse position in geodetic coordinates: longitude and
0006 latitude.
0007 In order to achieve this we need to create a vertical layout. Once we are done
0008 we add the slider and the label that we created to the layout. Also we zoom the
0009 globe to the slider's default value using the MarbleWidget::zoomView(int)
0010 method.
0011 We want to center our globe onto South America. So we create a new
0012 GeoDataCoordinates object that takes the longitude and the latitude as a
0013 parameter and we call MarbleWidget::centerOn.
0014 As you might have realized already GeoDataCoordinates is the geodetic "sister"
0015 of QPoint. They share a very similar API. Additionally GeoDataCoordinates
0016 features a nice set of string conversion methods
0017 (GeoDataCoordinates::fromString(), GeoDataCoordinates::lonToString() and
0018 GeoDataCoordinates::latToString()). They are used in various places inside
0019 Marble such as the signal MarbleWidget::mouseMoveGeoPosition(const QString&) .
0020 Finally we connect the signals and slots that MarbleWidget offers to the
0021 signals and slots of the slider and the label.