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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