QGIS » QGIS Application

This is a reopening of #12472 as current implementation, as provided by fixing #9292, is far from being usable and I, as a reporter of #12472, can not reopen it.

Even after implementing custom grid annotation formatting, adding a DMS with a correct text is more like a rocket science than a usable feature.

Use case: add a grid in WGS84 CRS with labels in format DMS + label «24°00'00.0"E».

Current option "DMS with Suffix" will provide «24°00'00.0"A» ("A" stands for "Austrumi" in Latvian) and the only way how to change "A" to "E" is to change the QGIS GUI language into English. Sucks, but somehow works.
e8c3afa3984cee32b98b52ba65bcf5ed630ae72d adds a "custom" grid annotation formatting option. The only issue - there is no shortcut to get DMS or to get current direction of coordinate axis. It provides two variables "@grid_number" - line coordinate in decimal degrees and "@grid_axis" - "X" or "Y" value where "X" means longitude and "Y" means latitude. Converting @grid_number from DD to DMS and providing correct label (N,E,S,W) is left as an exercise to reader.

"Exercise to reader" is a bit too complicated to be considered a suitable solution for average QGIS user. Here follows a non-working example that could be used to provide labels for Easting. Rinse and repeat for W, N and S (after spotting the mistake I have made in the code).

case 
when @grid_axis == 'x' and  @grid_number > 0 then format("%1°%2'%3\\"E",  floor(  @grid_number ), floor(( @grid_number - floor(  @grid_number )) * 60), ( @grid_number - floor(( @grid_number - floor(  @grid_number )) * 60)) * 3600)
end

The solution could cover two aspects (implementing one of them does not invalidate the second one):

1. for existing DMS + Suffix labels provide a configuration option where user can type-in labels for E,S,W,N directions (dummy friendly version);
2. for "custom" label formatter to provide variables with (Boeing pilot version):
   1. current D, M, S values (thus allowing format('%1deg %2min %3sec', @grid_deg, @grid_min, @grid_sec))
   2. current label quadrant as static value (N,E,S,W) (it would allow if(@grid_quad 'N', 'Ziemeļi'))