Hi Andrea, Thanks a lot for your reply. It works partially, with a problem. When I do the following, it works: <ogc:Function name="vec:Heatmap"> <ogc:Function name="parameter"> <ogc:Literal>data</ogc:Literal> </ogc:Function> <ogc:Function name="parameter"> <ogc:Literal>weightAttr</ogc:Literal> <ogc:Function name="MyFunction"> <ogc:Literal>120</ogc:Literal> </ogc:Function> </ogc:Function> </ogc:Function>
Here I'm passing the parameter as a literal value (120), but I need to pass the
id field not a literal value, so I did the following, but It doesn't work:
<ogc:Function name="vec:Heatmap">
<ogc:Function name="parameter">
<ogc:Literal>data</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>weightAttr</ogc:Literal>
<ogc:Function name="MyFunction">
<ogc:PropertyName>gtid</ogc:PropertyName>
</ogc:Function>
</ogc:Function>
</ogc:Function>
It gives a NullPointerExeption at the 2nd line of my evaluate function:
public Object evaluate(Object feature) {
Expression paramsExpression = params.get(0);
int geomId = paramsExpression.evaluate(feature, Integer.class);
....
}
MyFunction works perfectly in other situations, such as the following:
<PointSymbolizer>
<Graphic>
<Mark>
<WellKnownName>circle</WellKnownName>
<Fill>
<CssParameter name="fill">#FF0000</CssParameter>
</Fill>
</Mark>
<Size>
<ogc:Function name="MyFunction">
<ogc:PropertyName>gtid</ogc:PropertyName>
</ogc:Function>
</Size>
</Graphic>
</PointSymbolizer>
I've attached the HeatmapProcess.java after modification (all modifications are
marked with "CR#temp")
Regards,
Fawzy
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26. May 2018 17:08 by andrea.a...@geo-solutions.it
<mailto:andrea.a...@geo-solutions.it>:
> Hi,> the current definition of the process only accepts a String:
> https://github.com/geotools/geotools/blob/865cc72a90b07841a4c871d1b07fcc8e5defd35b/modules/unsupported/process-feature/src/main/java/org/geotools/process/vector/HeatmapProcess.java#L140
>
> <https://github.com/geotools/geotools/blob/865cc72a90b07841a4c871d1b07fcc8e5defd35b/modules/unsupported/process-feature/src/main/java/org/geotools/process/vector/HeatmapProcess.java#L140>
>
> You'll have to modify the process so that it accepts an Expression instead,
> and then> you should be able to call it like this (completely untested, mind,
> I hope it's going to work but I'm not sure):
> <ogc:Function name="vec:Heatmap">
> <ogc:Function name="parameter">
> <ogc:Literal>data</ogc:> Literal>
> </ogc:Function>
> <ogc:Function name="parameter">
> <ogc:Literal>weightAttr</ogc:> Literal>
> <> ogc:Function name="yourFunction">> ....>
> </ogc:Function>
> </ogc:Function>
> </ogc:Function>
>
> Cheers> Andrea
>
> On Sat, May 26, 2018 at 3:47 PM, <> faw...@tutamail.com
> <mailto:faw...@tutamail.com>> > wrote:
>
>> >> Hi,
>> In Geoserver's heat-map, as mentioned in the documentations, I can select
>> the weightAtrr field, for example:
>>
>> <ogc:Function name="vec:Heatmap">
>> <ogc:Function name="parameter">
>> <ogc:Literal>data</ogc:Literal>
>> </ogc:Function>
>> <ogc:Function name="parameter">
>> <ogc:Literal>weightAttr</ogc:Literal>
>> <ogc:Literal>field1</ogc:Literal>
>> </ogc:Function>
>> </ogc:Function>
>>
>> My situation is that the weight attribute, that I want to create the
>> heat-map depending on it, is not a field of the layer, it's a Geotools
>> custom function that I created. This function takes the field id as a
>> parameter, and makes some queries according to it, then returns a number.
>> For example the function is in the form:
>> int GetTheValue(int id)
>>
>> My question is that how to make this in SLD.
>>
>> <ogc:Function name="vec:Heatmap">
>> <ogc:Function name="parameter">
>> <ogc:Literal>data</ogc:Literal>
>> </ogc:Function>
>> <ogc:Function name="parameter">
>> <ogc:Literal>weightAttr</ogc:Literal>
>> <!-- call the function here -->
>> </ogc:Function>
>> </ogc:Function>
>>
>> Regards,>> Fawzy
>>
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>
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HeatmapProcess.java
Description: Binary data
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