How QtPositioning.coordToMercator() works?

[dalishi]

Hi, just when I'm about to implement the conversion from QML coordinate (lat, long, alt) to a Mercator project coordinate (e.g. UTM), I found this function in QML QtPositioning:

point coordToMercator(coordinate coord)

But there's no more detailed document about this function like which Mercator projection is used, and how about the Mercator Zone, etc. Anyone can enlighten me on how this function works?