Did you get this fixed? The layer looks right to me. --Steve
From: [email protected]
[mailto:[email protected]] On Behalf Of Charlie Allgrove
Sent: Wednesday, December 11, 2013 11:11 AM
To: [email protected]
Subject: [mapserver-users] Mapserver Expressions
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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