[mapserver-users] Orientation of vector symbols on a LINE

[TC Haddad]

Hello, I'm trying to understand symbol orientation and (maybe) use of
ANCHORPOINT on a line in Mapserver 6.2.

The vector symbol that I have been using for line cartography in MapServer
6.0.3 is below, and I am trying to get the same effect in Mapserver 6.2.1.

SYMBOL
  NAME "wavy_line"
  TYPE vector
  POINTS
    0 0
    1 1
    2 1
    3 0
    4 -1
    5 -1
    6 0
  END
END

Display in Mapserver 6.0.3:
https://dl.dropboxusercontent.com/u/42845001/mapserver6.0.3.png

Relevant Style bloc from Mapserver 6.0.3:

STYLE
     SYMBOL "wavy_line"
     WIDTH 1
     SIZE 2
     GAP -1
     COLOR 0 0 0
END

This did not translate directly to Mapserver 6.2.1, but I came close with
this:

STYLE
    SYMBOL "wavy_line"
     WIDTH 1
     SIZE 4
     GAP 6
     COLOR 0 0 0
END

which produced this:
https://dl.dropboxusercontent.com/u/42845001/mapserver6.2.1.png

Obviously I am missing something about how to get the symbol to orient
along the line, I played with ANCHORPOINT as that  was new in 6.2 and it
seemed like the default of 0.5 0.5  should work for my symbol, but I also
tried several other value combinations and it seemed to merely shift the
symbol around laterally, while maintaining an upright orientation.

So I'm a bit confused on how to achieve the original effect, (behavior
something like the equivalent of FOLLOW for Labels). Any pointers
appreciated...
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