[mapserver-users] Set OPACITY through runtime substitution

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Hello,

I'd like to be able to set OPACITY of a layer through a parameter within a
request, like:

http://mapserver-prelive.myserver.net/cgi-bin/mapserv?map=/var/www/mapserver/mymapfile.map&service=wms&request=GetMap&version=1.1.1&layers=wind_area&srs=EPSG:4326&BBOX=-43.6,17.5,42.8,73.6&WIDTH=400&HEIGHT=300&FORMAT=image/png&TIME=2016-01-01T18:00:00.000Z&OPACITY=50

Within the file where the layer is defined I added the line:
OPACITY [opacity]

To the VALIDATION section I have added the following lines:
	"opacity" "^[0-9]{1,2}$|^100$"
	"default_opacity" "100"

I keep getting an error:
getIntegerOrSymbol(): Symbol definition error. Parsing error near
(opacity):(line 173)

I've tried this on MapServer v6.4.1 and v7.0.0 with the same results. I have
also tried a different approach:

    CLASS
        EXPRESSION ('[opacity]' = '10')
        STYLE
            OPACITY 10
        END
    END
    CLASS
        EXPRESSION ('[opacity]' = '20')
        STYLE
            OPACITY 20
        END
    END

Playing around with the opacity value within the URL tells me it does
interpret the parameter, but setting the opacity like this returns a pink
image in all cases.

Please any help is appreciated.

Regards
Han






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