[mapserver-users] Problem with "ANGLE FOLLOW"

[Havard Tveite]

I have updated the documentation for 6.2 by including
a reference to MAXOVERLAPANGLE in the description of
ANGLE FOLLOW.

Håvard

On 12/3/2012 3:35 PM, Olivier Courtin wrote:
> Hi,
>
> For same kind of need (i.e hydrologic line to label), i've found that:
>   - Your lines must be long enough to allow the label to fit on (seems already your case, as it works for you without ANGLE FOLLOW)
>   - You have to increase MAXOVERLAPANGLE property
>   - Your lines have to be as smooth as possible
>
>
> Below a sample of such a thing with two layers, one with the data itself and one another using a generalization trought PostGIS ST_Simplify to help the geometry to be smoother enough
>
>   LAYER
>          NAME "label"
>          METADATA
>              "ows_title"           "Label des cours d'eau Carthage AERMC"
> 	    "ows_extent" "573401 6050407 1242369 6811885"
> 	    "ows_featureid" "gid"
>          END
>
>          PROJECTION
>              "init=epsg:2154"
>          END
>
>          TYPE line
>          STATUS on
>          DATA "geom from (SELECT gid, ST_simplify(geom, 200) As geom , toponyme, classe::integer
>                           FROM aermc.cours_eau WHERE toponyme IS NOT NULL)
>                AS foo using unique gid using srid=2154"
>      	CONNECTIONTYPE postgis
>      	CONNECTION "host=XXXX port=5432 dbname=XXXX user=XXXX"
>          LABELITEM toponyme
>          CLASSITEM classe
>          CLASS
>              EXPRESSION ([classe] <= 2)
>              LABEL
>                COLOR 0 0 0
>                OUTLINECOLOR 210 210 210
>                TYPE TRUETYPE
> 	      FONT vera
>      	      SIZE 10
>                ANTIALIAS TRUE
>                POSITION UC
>                ANGLE FOLLOW
>                PARTIALS FALSE
>                MINFEATURESIZE auto
>                REPEATDISTANCE 500
> 	      MAXOVERLAPANGLE 45
>              END
>          END
>          CLASS
>              EXPRESSION ([classe] <= 4)
>              LABEL
>                COLOR 30 30 30
>                OUTLINECOLOR 210 210 210
>                TYPE TRUETYPE
> 	      FONT vera
>      	      SIZE 8
>                ANTIALIAS TRUE
>                POSITION UC
>                ANGLE FOLLOW
>                PARTIALS FALSE
>                MINFEATURESIZE auto
> 	      MAXOVERLAPANGLE 40
>              END
>          END
>          CLASS
>              LABEL
>                COLOR 60 60 60
>                OUTLINECOLOR 210 210 210
>                TYPE TRUETYPE
> 	      FONT vera
>      	      SIZE 8
>                ANTIALIAS TRUE
>                POSITION UC
>                ANGLE FOLLOW
>                PARTIALS FALSE
>                MINFEATURESIZE auto
> 	      MAXOVERLAPANGLE 40
>              END
> 	END
>      END
>
>      LAYER
>          NAME "cours_eau"
>          METADATA
>              "ows_title"           "Cours d'eau Carthage"
> 	    "ows_extent" "573401 6050407 1242369 6811885"
> 	    "ows_featureid" "gid"
>          END
>
>          PROJECTION
>              "init=epsg:2154"
>          END
>
>          TYPE line
>          STATUS on
>          DATA "geom from (SELECT gid, geom , classe::integer FROM aermc.cours_eau
>                           WHERE toponyme IS NOT NULL)
>                AS foo using unique gid using srid=2154"
>      	CONNECTIONTYPE postgis
>      	CONNECTION "host=XXXX port=5432 dbname=XXXX user=XXXX"
>          CLASSITEM classe
>          CLASS
>              EXPRESSION ([classe] <= 2)
> 	    STYLE
> 	    	COLOR 33 33 210
> 		WIDTH 5
>              END
>          END
>          CLASS
>              EXPRESSION ([classe] <= 4)
> 	    STYLE
> 	    	COLOR 66 66 210
> 		WIDTH 3
>              END
>          END
>          CLASS
> 	    STYLE
> 	    	COLOR 99 99 210
> 		WIDTH 1
>              END
> 	END
>      END
>
>
>
>
> HTH,
>
>
> --
>
> Olivier