[mapserver-users] Mapserver Expressions

[Charlie Allgrove]

Hi

 

I'm looking to change the symbol used on a given layer, based on the
(Google) zoom level supplied to the mapserv CGI.

 

The Layer in question in the map file looks like this:

 

LAYER

    VALIDATION 

        'tile'  '^[0-9]+ [0-9]+ [0-9]{1,2}$'

    END

    PROJECTION

        "init=epsg:4326"

    END

    NAME hubs

    TYPE point

    STATUS ON

    DATA 'hub_data.shp'

    CLASS

     EXPRESSION('%tile%' ~ '16$')

      NAME 'hub_layer_small'

      STYLE

        SYMBOL 'cloud_500'

      END #STYLE

    END #CLASS

    CLASS

      EXPRESSION('%tile%' ~ '17$')

      NAME 'hub_layer_large'

      STYLE

        SYMBOL 'cloud_200'

      END #STYLE

    END #CLASS

    CLASS

      NAME 'hub_layer_default'

      STYLE

        SYMBOL 'cloud_200'

       SIZE 2

      END #STYLE

    END #CLASS

 

    TEMPLATE "xxx"

        METADATA

            "wms_title" "Hub data layer"

        END

  END #LAYER

 

 

Requests are made to the CGI with the following example querystring:

?layer=hubs&mode=tile&tilemode=gmap&tile=19288 24631 16

 

I *thought* it was possible to use EXPRESSION to test the 'tile' variable
and act accordingly, but it's not working (I always get the default class
used instead). 

 

> ./mapserv -v

MapServer version 6.0.1 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG SUPPORTS=PROJ
SUPPORTS=AGG SUPPORTS=CAIRO SUPPORTS=FREETYPE SUPPORTS=ICONV
SUPPORTS=FRIBIDI SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER
SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER SUPPORTS=SOS_SERVER SUPPORTS=FASTCGI
SUPPORTS=THREADS SUPPORTS=GEOS INPUT=POSTGIS INPUT=OGR INPUT=GDAL
INPUT=SHAPEFILE

 

Any pointers? Thanks in advance.

 

Charlie 

 

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