[mapserver-users] Use STYLEITEM to style individual features?

[Tamas Szekeres]

Alex,

This is indeed a bug in mapserver, symbol indexes are not resolved from
symbol names when updating a style from string. You might want to file a
ticket and assign that to me in the github issue
tracker<https://github.com/mapserver/mapserver/issues/new>
.

Best regards,

Tamas



2012/11/29 Alexander Schenkel <aschenkel at kadenpartner.ch>

> Dear all,
>
> We have the following setup:
>
> Our features come as DB records out of a PostGIS 1.5 database, which
> contains a column "mapserver_style" besides other data columns. We want
> to use that column to style the individual features.
>
> Since MapServer 6.0 (we use 6.0.2), the Mapserver LAYER config knows the
> "STYLEITEM" configuration attribute, which takes the name of an
> item (DB column, in our case), and, according to the documentation,
> should contain a STYLE ...END string.
>
> This seems not to be working or we use it the wrong way. Our Mapfile's
> LAYER definition looks as follows (cleaned out
> all irrelevant information):
>
>
> ######
> LAYER
>   NAME layername
>   DATA "wkb_geometry from (SELECT
> wkb_geometry,mapserver_style,some_other_data) as foo using SRID=21781,
> using unique ogc_fid"
>
>   TYPE POINT
>   STATUS ON
>   OPACITY 100
>   DUMP TRUE
>   STYLEITEM "mapserver_style"
>
>   CLASS
>   END
> END
> ######
>
> while "mapserver_style" corresponds to the database column containing
> the "STYLE .... END" string.
>
> As an example, the "mapserver_style" column for a single feature contains:
>
> STYLE
>     SIZE 10
>     COLOR 135 255 135
>     OUTLINEWIDTH 2
>     OUTLINECOLOR 0 0 0
>     SYMBOL 'filled square'
> END
>
> which does NOT draw any visible feature on the map.
>
> If we just surround this example with "CLASS .... END", it basically
> works, BUT the class(es) then match every single feature, leading to
> overlapping feature symbols
> for every single feature appearing after the class has been defined:
>
> CLASS
>     STYLE
>         SIZE 10
>         COLOR 135 255 135
>         OUTLINEWIDTH 2
>         OUTLINECOLOR 0 0 0
>         SYMBOL 'filled square'
>     END
> END
>
> So can anybody tell us how we can style features on a per-feature basis
> using the STYLEITEM config? Or is this the wrong way?
>
> Many thanks for your support,
>
> alex
>
>
>
>
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> mapserver-users at lists.osgeo.org
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>
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