'If you want to go that way yes... otherwise you just extend the feature
type with a "color" attribute and use
it directly in the style.
A rendering transformation can do worse things (change raster into vector
and vice versa), adding an
attribute is kind of light lifting for it ;-)'
It seems simple to you but not for me...I am on the same poblem for weeks
now And I am still not able to get some results, I hope you will be able to
help me ;)
Thank you
2015-02-09 13:03 GMT+01:00 Bonventi Matthieu <[email protected]>:
> I think I don't understand how the whole thing is functionning . I try to
> code , the first part is :
>
> @DescribeProcess(title = "DynamicColorCompute", description = "xxxx")
> public class DynamicColorCompute implements GSProcess {
>
> @DescribeResult(name = "result", description = "xxx")
> public SimpleFeatureCollection execute(
>
> // process data
> @DescribeParameter(name = "data", description = "Features
> containing the data points") SimpleFeatureCollection obsFeatures,
> ProgressListener progressListener)
>
> throws ProcessException {
>
> FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2();
>
>
>
> Expression = ff.property(obsFeatures);
> MaxVisitor maxVisitor = new MaxVisitor(expression);
> collection.accepts(maxVisitor, null);
> CalcResult resultmax = maxVisitor.getResult();
>
> Object max = resultmax.getValue();
>
> MinVisitor minVisitor = new MinVisitor(expression);
> collection.accepts(minVisitor, null);
> CalcResult resultmin = minVisitor.getResult();
>
> Object min = resultmin.getValue();
>
>
> }
>
> }
>
> Is it the right way to get the min value and max value ? But how can I
> connect it with that part of code (which need to have a value as input with
> the min and max) :
>
> private Color getRGBcolor(float value,float minValue,float maxValue,float
> saturation,float brightness) {
> float hue = (value - minValue) / (maxValue - minValue);
> if (hue < 0.0f || hue > 1.0f) {
> return null;
> }
>
> int rgb = Color.HSBtoRGB(adjustedGradient(hue), saturation,
> brightness);
> return new Color(rgb);
> }
>
> private float adjustedGradient(float hue) {
>
> return hue * 0.32f;
> }
>
> 2015-02-09 12:10 GMT+01:00 Bonventi Matthieu <[email protected]>
> :
>
>> Plus, how can I access the current feature to code the color ? I mean
>> what I need to contribute the new attribute is the current value,the min
>> and the max.
>>
>> 2015-02-09 11:33 GMT+01:00 Bonventi Matthieu <[email protected]
>> >:
>>
>>> Hello Andrea,Jody,
>>>
>>> I am back to work and I just want to check something.
>>> First, let's back to the problem, The process will be :
>>>
>>> 1/ get dataset through the 'data' paramter of the tranformation function
>>> 2/ access the all data collection to get be able to get the min and the
>>> max
>>> 3/ compute the hue color code
>>> 4/ return it to the sld where I call the function I made 2 weeks ago to
>>> color it
>>>
>>> Basically If I understood, The tranformation process get the data set,
>>> compute something and send it back to the symbolizer.
>>>
>>> Secondly, You told me I should use the tranformation process one. So you
>>> mean I have to use the heatmap ? I read the code and find
>>>
>>> @DescribeProcess(title = "Heatmap", description = "Computes a heatmap
>>> surface over a set of irregular data points as a GridCoverage.")
>>> public class HeatmapProcess implements GSProcess {
>>>
>>> @DescribeResult(name = "result", description = "The heat map surface as
>>> a raster")
>>> public GridCoverage2D execute(
>>>
>>> // process data
>>> @DescribeParameter(name = "data", description = "Features
>>> containing the data points") SimpleFeatureCollection obsFeatures
>>>
>>>
>>> So I should be able to get the min and max from obsFeatures right ? My
>>> question is what I have to put instead of GridCoverage2D Because Actually I
>>> don't want any tranformation, just compute a value using the min and max of
>>> the collection and return that value to the sld to proceed with the
>>> coloration ?
>>>
>>> I hope I don't bother your with all these questions but at the end maybe
>>> we will have a dynamic Choropleth map, interesting isn't it ?
>>>
>>> Best regards ;)
>>>
>>> 2015-01-30 21:44 GMT+01:00 Andrea Aime <[email protected]>:
>>>
>>>> On Fri, Jan 30, 2015 at 8:53 PM, Jody Garnett <[email protected]>
>>>> wrote:
>>>>
>>>>> That is a good idea ... although this is probably the whole collection
>>>>> for the current bounding box. All we would have to do is be able to assign
>>>>> the result to an environment variable to complete the workflow.
>>>>>
>>>>>
>>>> If you want to go that way yes... otherwise you just extend the feature
>>>> type with a "color" attribute and use
>>>> it directly in the style.
>>>> A rendering transformation can do worse things (change raster into
>>>> vector and vice versa), adding an
>>>> attribute is kind of light lifting for it ;-)
>>>>
>>>> Cheers
>>>> Andrea
>>>>
>>>> --
>>>> ==
>>>> GeoServer Professional Services from the experts! Visit
>>>> http://goo.gl/NWWaa2 for more information.
>>>> ==
>>>>
>>>> Ing. Andrea Aime
>>>> @geowolf
>>>> Technical Lead
>>>>
>>>> GeoSolutions S.A.S.
>>>> Via Poggio alle Viti 1187
>>>> 55054 Massarosa (LU)
>>>> Italy
>>>> phone: +39 0584 962313
>>>> fax: +39 0584 1660272
>>>> mob: +39 339 8844549
>>>>
>>>> http://www.geo-solutions.it
>>>> http://twitter.com/geosolutions_it
>>>>
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>>>>
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>>>>
>>>>
>>>>
>>>> The information in this message and/or attachments, is intended solely
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>>>> or proprietary in nature or covered by the provisions of privacy act
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>>>> Code).Any use not in accord with its purpose, any disclosure, reproduction,
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>>>>
>>>> -------------------------------------------------------
>>>>
>>>
>>>
>>>
>>> --
>>> Matthieu BONVENTI
>>>
>>
>>
>>
>> --
>> Matthieu BONVENTI
>>
>
>
>
> --
> Matthieu BONVENTI
>
--
Matthieu BONVENTI
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