Hi all,
I've noticed that there's an implementation difference between
specifying a perpendicular offset in the STYLE section of the Mapfile:
STYLE
...
OFFSET 3 -99
...
END
and specifying it via an SLD:
<sld:LineSymbolizer>
...
<sld:PerpendicularOffset>3</sld:PerpendicularOffset>
...
<sld:LineSymbolizer>
The first one, via the Mapfile, does a complex offset calculation
(function msOffsetPolyline() in maputil.c; calls msOffsetCurve() for
perpendicular offset).
The second one, via the SLD, simply does a displacement by the given
value in both the X and Y directions (function msSLDParseLineSymbolizer()
in mapogcsld.c).
These two produce quite different results.
[Note that the SLD one would be the same as specifying "OFFSET 3 3" in
the Mapfile.]
My questions:
Is there a reason the two methods are different?
If not, would it be possible to change the SLD one to use the same
calculations as done for the Mapfile?
Kind regards,
--
-- Gertjan van Oosten, Principal Consultant, West Consulting B.V.
-- gert...@west.nl +31 15 2191 600 www.west.nl
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