Hi,
I would like to introduce the possibility to use CQL expressions to specify
the value of some attributes of ColorMapEntry SLD tags in raster
symbolizers.
My purpose is to be able to use values from WMS requests (specifically
variables in the ENV parameter) to dynamically specify those entries
attributes in each request.
I would use the already used ${...expression...} syntax for expressions:
An example:
<ColorMap type="intervals" extended="true">
<ColorMapEntry color="#FF0000" quantity="0.00000000001" label="None"
opacity="0"/>
<ColorMapEntry color="#00FF00" quantity="${env('low',3)}" label="Low"
opacity="1"/>
<ColorMapEntry color="#FFFF00" quantity="${env('medium',10)}"
label="Medium" opacity="1"/>
<ColorMapEntry color="#FF0000" quantity="${env('high',1000)}"
label="High" opacity="1"/>
</ColorMap>
In the WMS request I would specify the env parameter as:
env=low:10;medium:100;high:1000
For my use case, the expression support is needed only for the quantity
attribute, but since I am working on it, I would extend it to all the
ColorMapEntry attributes, for completeness.
What do you think?
Regards,
Mauro
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