Re: [JPP-Devel] question to Michael - Beanshell

[Martin D. <mb...@re...>]

Right, yes, I saw that.

It's certainly easier to do for raster analysis - I think there's fewer 
corner cases and exception.  But FME provides an example of doing this 
for vector-based analysis. 

Stefan Steiniger wrote:
> Hei Martin
>
> Martin Davis wrote:
>   
>> Ultimately it would be cool to provide a Visual Programming interface to 
>> JEQL, which would make this even easier to use.  Does the Sextante Model 
>> Builder provide a graphical interface?
>>     
>
> yes .. see the 3rd picture:
> http://forge.osor.eu/plugins/wiki/index.php?Screenshots&id=13&type=g
>
>   
>> Michaël Michaud wrote:
>>     
>>> Giuseppe Aruta a écrit :
>>>   
>>>       
>>>> Hi Michael,
>>>> a couple of question:
>>>> 1) Is it possible to create a bean tool which automatically calculate the x,y coordinates of a point layer and write them as attributes? This script will be quite useful for GPS support.
>>>>   
>>>>     
>>>>         
>>> Sure, not very difficult,
>>> I put it here after. If you want to test it and if it suits your needs, 
>>> we can add it to the distribution.
>>>   
>>>       
>>>> 2) One of the possible line od OJ development is the construction of a "model buider" similar to one which in Sextante (http://openjump.org/wiki/show/Google+Summer+Of+Code+Ideas+List), how Beanshell can be useful for it?
>>>>   
>>>>     
>>>>         
>>> I did not explore sextante yet, but I like very much the idea of model 
>>> builder.
>>> As far as I can imagine a model builder, it uses interfaces with inputs, 
>>> outputs and a methods to process data.
>>> The processing part could be defined as a script to include methods 
>>> which are not proposed by the basic model builder.
>>> Exemple :
>>> The model builder may propose a "filter a featureCollection", "union a 
>>> featureCollection",  but miss a "explode a featureCollection containing 
>>> geometryCollections". With beanshell, just do it yourself. It's just 
>>> some thoughts, it may not be so easy to include scripting capabilities 
>>> into such a model and its user interface.
>>>
>>> Michaël
>>>
>>> Here is the script to add XY attributes :
>>>
>>> // This script adds a new layer from a selected one
>>> // The new layer has two new attributes
>>> // containing X and Y of a coordinate
>>>
>>> import com.vividsolutions.jump.feature.*;
>>> import com.vividsolutions.jump.workbench.model.StandardCategoryNames;
>>>
>>> ll = wc.layerNamePanel.selectedLayers;
>>> if (ll.length != 1) wc.workbench.frame.warnUser("Exactly one layer must 
>>> be selected");
>>> else {
>>>   fc = ll[0].featureCollectionWrapper;
>>>   fs = fc.featureSchema.clone();
>>>   fs.addAttribute("X", AttributeType.DOUBLE);
>>>   fs.addAttribute("Y", AttributeType.DOUBLE);
>>>   resultFC = new FeatureDataset(fs);
>>>   for (f : fc.features) {
>>>     nf = new BasicFeature(fs);
>>>     for (int i = 0 ; i < fs.attributeCount-2 ; i++){
>>>         nf.setAttribute(i, f.getAttribute(i));
>>>     }
>>>     nf.setAttribute("X", f.geometry.coordinate.x);
>>>     nf.setAttribute("Y", f.geometry.coordinate.y);
>>>     resultFC.add(nf);
>>>   }
>>>   wc.layerManager.addLayer(StandardCategoryNames.RESULT, 
>>> ll[0].name+"_XY", resultFC);
>>> }
>>>
>>>   
>>>       
>>>> Regards
>>>>
>>>> Peppe
>>>>
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>
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-- 
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022