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

[Havard Tveite]

The implementation of GAP has been fixed (center to center
distance between symbols), and so has the calculation of
symbol height.
I guess that the following should work:

STYLE
   SYMBOL "wavy_line"
   WIDTH 1
   SIZE 2
   GAP -6
   COLOR 0 0 0
END

Since you have y values from -1 to 1, and x values between 0
and 6, the ratio between the height of your symbol and the
length is 2 / 6.  The ratio between size and gap should be the
same to make the the line continuous.

Håvard

On 8/29/2013 1:31 AM, TC Haddad wrote:
>
> 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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>

-- 
Håvard Tveite
Department of Mathematical Sciences and Technology, UMB
Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY
Phone: +47 64965483 Fax: +47 64965401 http://www.umb.no/imt/