Howto get shooting direction
I use QT/Qml, I'm writing an app where user can shoot a photo.
I need to know the position of the user at the shoot time and what direction his camera is pointing.
Then, with this informations I want to show a point on the map and an arrow indicating the shooting direction.
I can read GPS position (Lat,Lon) using PositionSource and that's ok, but how to get the camera rotation angles?
Something like https://doc.qt.io/qt-5.10/qml-qtsensors-rotationsensor.html?
If I have correctly understood the documentation the angle indicating the direction to the north is myRotationSensor.reading.z
I also found the Compass class that gives me myCompassSensor.reading.azimuth directly
Which is the best?
If I tilt the phone up, the azimuth value (also from myRotationSensor.reading.z) will gradually change from 0 to 180 but myRotationSensor.reading.x remains around 90 degrees, how to correct this value? Should I compensate with myRotationSensor.reading.y? how?