[MAPSERVER-USERS] agg and line widths

[thomas bonfort]

hi,
you're probably drawing polygons with adjacent borders right?
in this case, each line except the outer ones is drawn twice, and thus
its final width is larger than what is requested.
I don't think there's much you can do about it except preprocess your
data to transform it into a line layer with no duplicates.

cheers,
--
Thomas Bonfort

Camptocamp France SAS
Tel : +33 (0)4 79 26 57 97
thomas dot bonfort at camptocamp dot com
http://www.camptocamp.com

On Sat, Mar 29, 2008 at 1:22 PM, DNC <dncarreira at gmail.com> wrote:
>
>  Hi.
>
>  I'm having trouble getting thin lines to draw. The thinnest line I get seems
>  to be 2 pixels wide at least. Using GD the lines are indeed 1 pixel. Anyone
>  can point out why this happens?
>
>  Some sections from the map file:
>  OUTPUTFORMAT
>   NAME 'AGG_Q'
>   DRIVER AGG/PNG
>   MIMETYPE "image/png"
>   IMAGEMODE RGB
>   FORMATOPTION "QUANTIZE_FORCE=ON"
>   FORMATOPTION "QUANTIZE_DITHER=OFF"
>   FORMATOPTION "QUANTIZE_COLORS=256"
>  END
>   LAYER
>     NAME 'test'
>     GROUP "test group"
>     TYPE POLYGON
>     #MINSCALE 250000
>     CONNECTIONTYPE postgis
>     CONNECTION 'bla'
>     PROCESSING "CLOSE_CONNECTION=DEFER"
>     DATA 'the_geom from table using unique gid'
>     #FILTER ''
>     METADATA
>       'wms_title'           'some layer'
>       "ows_abstract"    "some text"
>       'wms_srs'             'EPSG:27492'
>       "wms_opaque"    "0"
>       "wms_group_title" "group title"
>       "wms_group_abstract" "group text"
>     END
>     STATUS ON
>     TRANSPARENCY 100
>     PROJECTION
>     'init=epsg:27492'
>     END
>     EXTENT -23893.143277 -173568.018533 62541.864515 -70038.622014
>     MINSCALE 1
>  #    MAXSCALE 100000
>     # data is queryable
>     DUMP TRUE
>     HEADER   /ms_ogc_workshop/templates/rivers_query_header.html
>     TEMPLATE /ms_ogc_workshop/templates/rivers_query_body.html
>     # fuzziness for querying
>     TOLERANCE 5
>     CLASS
>        NAME 'outlines'
>        STYLE
>          WIDTH 1
>          OUTLINECOLOR 232 232 232
>        END
>     END
>   END
>
>  Regards,
>  Duarte
>  --
>  View this message in context: http://www.nabble.com/agg-and-line-widths-tp16369480p16369480.html
>  Sent from the Mapserver - User mailing list archive at Nabble.com.
>
>  _______________________________________________
>  mapserver-users mailing list
>  mapserver-users at lists.osgeo.org
>  http://lists.osgeo.org/mailman/listinfo/mapserver-users
>