[gdal-dev] OGRStyleLabel/OGRStyleTool units

[Andre Vautour]

I am trying to interpret font sizes coming from OGR feature style strings.

I would expect a font size in ground units to be scale-dependent 
inasmuch as a label would get smaller when you zoom out and bigger when 
you zoom in. I would expect a font size in pts, mm, inches, pixels, etc. 
to be scale-independent and to be drawn with that size at the current 
display scale.

The problem I have encountered is that the style tools do not seem to 
offer a way to get at the input units (OGRStyleValue::eUnit) of a given 
parameter. The classes only seem to offer a way to convert the values 
from their unexposed input units to some given output units.

Is there a way to get at that information? If not, would it make sense 
to add a GetInputUnit(Param) method on the OGRStyleTool classes?
OGRSTUnitId GetInputUnit(OGRSTLabelParam eParam, GBool &bValueIsNull);

I have also considered trying to use SetInternalInputUnitFromParam to 
work around the problem at my level, but I cannot seem to get at the 
original parameter string as GetParmStr gives back a unit-converted string.

Thanks,
Andre

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