[mapserver-users] Problem with "ANGLE FOLLOW"

[Olivier Courtin]

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
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