[mapserver-users] rotation of vector symbol

[Gerry Creager]

Alberto,

I'm not sure if this comment is a "bug" report or documentation of 
performance.

A clockwise rotation isn't wrong, if it's understood and documented. 
 From my perspective (wind/weather) an anti-clock rotation, which you're 
presenting as "right" is counterintuitive.  Although I would prefer to 
see the rotation origin start at 'north' it does not pose a serious 
problem, as I know what the rule is, and it is invariant.

gerry

Alberto Poggi wrote:
> Hi.
> Let me tell you about an issue of rotation of the vector symbols. I
> found that in mapserver the rotation of these symbols does not follow
> the classic rules that provide for the starting rotation in sequence
> from east to the north, west and south. I published my work with
> PMAPPER and MAPSERVER and I noticed that the rotation is done on the
> other hand (east, south, west and north), and only on symbols of a
> vector. This problem on the labelling does not exist and the rotation
> is correct.
> The layer referenced for symbol is a postgis table that contains a
> field "rotazione" used by MapServer for the rotation of symbols. The
> display of symbols is right but the rotation is done wrong.
> This is the definition of my symbol:
> SYMBOL
>   NAME "valvola"
>   TYPE vector
>   POINTS
>     0 0
>     1.5 1
>     1.5 0
>     0 1
>     0 0
>   END
>   FILLED TRUE
> END
>  and this is the notation in the mapfile:
> LAYER
>   NAME "Valvole"
>   TYPE POINT
>   CONNECTIONTYPE postgis
>   CONNECTION "user=****** password=***** dbname=ACQUA host=localhost"
>   DATA "the_geom FROM valvole"
>   STATUS DEFAULT
>   MAXSCALE 5001
>   TOLERANCE 10
>   TOLERANCEUNITS pixels
>   PROJECTION
>     "init=epsg:32632"
>   END
> 
>   METADATA
>     "DESCRIPTION" "Valvole"
>     "RESULT_FIELDS" "comune,localita"
>     "RESULT_HEADERS" "Comune,Località"
>     "LAYER_ENCODING" "UTF-8"
>     "ows_title"      "Dati valvole"
>   END  # Metadata
> 
>   CLASS
>         NAME   "Valvole"
> 
>         STYLE
>         SYMBOL 'valvola'
>         COLOR   0 255 255
>         OUTLINECOLOR 0 0 0
>         ANGLE [rotazione]
>         SIZE 8
>         END
>   END
>   TEMPLATE void
> END
> 
> It's me that something wrong or is a known problem? Thank you.
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
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