Coordinate Conversion C++

Question

I am  trying to convert the view coordinates (Upper left and lower right corners) to real world coords in lat/lon, and can't figure it out.  We are on version 100.4 of the Qt C++ SDK.

Here is the setup that I am using:

m_mapView = new MapGraphicsView(this);

// Create a map using the openStreetMap Basemap
 m_map = new Map(BasemapType::OpenStreetMap,37.22296, -80.4139, 12);
 m_mapView->setMap(m_map);

Any help would be appreciated

RobLefebvre · Answer

This morning, in the doneLoading slot connection, the transformations don't work.  
However, if we capture a mouse click, and try to do transformations there, they are working fine.
Also, if we set a timer for 1 second, after we set the map and view up, the translations work fine too.  
Strange, for sure...

LukeSmallwood · Answer

Hi Rob - does  the map render correctly? e.g. do you see the OpenStreetmap basemap you set above? If it's rendering then the map is loading.

One possibility could be that you connect to the signal after loading is complete. The loading cycle will be kicked off as soon as you call m_mapView->setMap(m_map);. Can you make sure you set up the connection as soon as you construct the map?

Another observation is that you are setting the initial viewpoint for the map after you set it on the mapView (m_map->setInitialViewpoint(viewpoint);). For this to have an affect you need to do that before passing the map to the mapView as well.

RobLefebvre · Answer

We added a connect for the signal(s) mentioned, and they are NOT being hit. We tried both to a Lambda and a method, but none were executed. We also set a QTimer to fire every second, and re-try to get the info from the map, but to no avail. void TestMap::mapDoneLoading(Esri::ArcGISRuntime::Error loadError) { auto mapRect = m_mapView->rect(); auto b = m_mapView->screenToLocation(0.0, 0.0); QString str = QString::number(b.x()) + QString::number(b.y()); QString sceneRectUL = CoordinateFormatter::toLatitudeLongitude(Point(m_mapView->rect().topLeft().x(), m_mapView->rect().topLeft().y()), LatitudeLongitudeFormat::DecimalDegrees, 4); qDebug() << "Scene Coords: "<< sceneRectUL; } connect(m_map, &Map::doneLoading, this, &TestMap::mapDoneLoading);