Sounds good to evaluate the Literal Expressions. I guess we get a function
for each, lets say categorize/interpolate/recode and one generic for
Literals. the generic one will be called e.g. from visit(Stroke stroke);
Agree, -1 if something went wrong that the caller can set estimateAccurate
to false.
Cheers
- Frank
2013/9/4 Andrea Aime <[email protected]>
> On Wed, Sep 4, 2013 at 9:47 AM, Frank Gasdorf <[email protected]
> > wrote:
>
>> Hello everybody,
>>
>> while we at uDIG make use of MetaBufferEstimator I run into the following
>> issue:
>>
>> The features are LineStrings and the style has the following definition,
>> represented as ans SLD fragement:
>>
>> <sld:LineSymbolizer>
>> <sld:Stroke>
>> <sld:CssParameter name="stroke">
>> <ogc:Literal>#008000</ogc:Literal>
>> </sld:CssParameter>
>> <sld:CssParameter name="stroke-width">
>> <ogc:Function name="Categorize">
>>
>> <ogc:PropertyName>myProperty</ogc:PropertyName>
>> <ogc:Literal>1</ogc:Literal>
>> <ogc:Literal>101</ogc:Literal>
>> <ogc:Literal>2</ogc:Literal>
>> <ogc:Literal>300</ogc:Literal>
>> <ogc:Literal>4</ogc:Literal>
>> </ogc:Function>
>> </sld:CssParameter>
>> </sld:Stroke>
>> </sld:LineSymbolizer>
>>
>> Having the CategorizeFunction as Literal the Estimator returns false
>> for isEstimateAccurate() which leads into logging massages in uDIG such as
>> this:
>>
>> !MESSAGE Assuming rendering buffer = 0, but estimation is not accurate,
>> you may want to set a buffer manually
>>
>> I expected an valid buffer size for this kind of Literal and assumed to
>> get the greatest value, in this case 4.
>>
>> I've no idea if there are other Literal functions mere it could make
>> sense to return the maximum value of all options. What do you think about
>> extending functionality for strike-width values. I know that this would
>> lead into several additional cast checks but I guess its worth to get an
>> accurate estimate.
>>
>
> These new functions need some custom handling, but they could also be
> applied to a graphic size,
> I'd try to roll out a new method that gets and expression and
> handles both the literal case, and the categorize/interpolate/recode
> functions, returning the max value
> for the expression (or -1 if no max value can be determined I guess)
>
> Cheers
> Andrea
>
>
> --
> ==
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> ==
>
> Ing. Andrea Aime
> @geowolf
> Technical Lead
>
> GeoSolutions S.A.S.
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