Re: [Repast-interest] GIS Display - Shapefiles and Subcontexts

[Pedro M. <p.m...@gm...>]

I think I making some progress. Here are some of my conclusions:

- Instead of implementing a Context for each type of Agent that one need to
visualize and to add some behaviour, one should have only a main Context
with one Geography Projection.
- All the features from the shapefiles that one needs to manipulate should
be mapped to Agents and added to the geography projection in the main
context (see the example below).
- If one is dealing with a fair amount of features (let's say 50000 features
where the geometry type is irrelevant) that are mapped to Agents, one should
expect a loading time of several minutes.


Please correct me if I said something that's not right.


Best regards,
Pedro Mendes

*(the example)*
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.feature.Feature;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;

import repast.simphony.context.DefaultContext;
import repast.simphony.context.space.gis.GeographyFactoryFinder;
import repast.simphony.space.gis.Geography;
import repast.simphony.space.gis.GeographyParameters;
import repast.simphony.space.gis.ShapefileLoader;

/**
 * @author pmendes
 *
 */
public class TopologyContext extends DefaultContext<Object>{

public TopologyContext() {
 super("TopologyContext");
 GeographyParameters<Object> params = new GeographyParameters<Object>();
 Geography<Object> geography =
GeographyFactoryFinder.createGeographyFactory(null).createGeography("TopologyGeography",
this, params);
 URL fileURL;
ShapefileDataStore store;
FeatureCollection collection;
  try {
 fileURL = new File("misc/shapefile/exchanges.shp").toURI().toURL();
store = new ShapefileDataStore(fileURL);
 collection = store.getFeatureSource().getFeatures();
ShapefileLoader<ExchangeAgent> eloader = new
ShapefileLoader<ExchangeAgent>(ExchangeAgent.class, fileURL, geography,
this);
 FeatureIterator fIterator = collection.features();
 System.out.println("Preparing to load a set of Exchange Agents...");
 while (eloader.hasNext()) {
Feature feature = fIterator.next();
ExchangeAgent agent = new ExchangeAgent(extractFeatureId(feature),
(String)feature.getAttribute("label"));
 eloader.next(agent);
}
fIterator.close();
 System.out.println(collection.size() + " Exchange Agents loaded!");
} catch (MalformedURLException e) {
 e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
 }
 try {
 fileURL = new File("misc/shapefile/routes-smaller.shp").toURI().toURL();
store = new ShapefileDataStore(fileURL);
 collection = store.getFeatureSource().getFeatures();
ShapefileLoader<RouteAgent> rloader = new
ShapefileLoader<RouteAgent>(RouteAgent.class, fileURL, geography, this);
 FeatureIterator fIterator = collection.features();
 System.out.println("Preparing to load a set of Route Agents... ");
 while (rloader.hasNext()) {
Feature feature = fIterator.next();
RouteAgent agent = new RouteAgent(
 extractFeatureId(feature),
(String) feature.getAttribute("entity"),
 (String) feature.getAttribute("network"),
(String) feature.getAttribute("instalation"),
 (Double) feature.getAttribute("length_m"));
rloader.next(agent);
 }
fIterator.close();
System.out.println(collection.size() + " Route Agents loaded!");
 } catch (MalformedURLException e) {
e.printStackTrace();
 } catch (IOException e) {
e.printStackTrace();
}
 }

/**
 * @param feature
 * @return the numeric part of the feature id
 */
 protected static int extractFeatureId(Feature feature){
return
Integer.parseInt(feature.getID().substring(feature.getID().indexOf(".") +
1));
 }

}

On Wed, Apr 27, 2011 at 6:08 PM, Pedro Mendes <p.m...@gm...>wrote:

>
> Hi,
>
>
> S. Markisic wrote:
> >
> > In my project i need to visualize these actually "static" layers without
> > this work around, becouse i have to change the behaviour and
> visualisation
> > dynamically.
> >
>
> Did you achieve this? I'm having the same problem. The several contexts,
> geographic projections and the agents are been created but I can only see
> the shapefile's data when I put it in static layers...
>
> My agents are been dynamically mapped from shapefile's features. Here's an
> example:
>
> <!-- CODE -->
> public RouteContext() {
>                super("RouteContext");
>
>                GeographyParameters<RouteAgent> params = new
> GeographyParameters<RouteAgent>();
>                // params.setCrs("EPSG:3763");
>                Geography<RouteAgent> geography =
>
> GeographyFactoryFinder.createGeographyFactory(null).createGeography("RouteGeography",
> this, params);
>                File file = new File("misc/shapefile/routes.shp");
>                ShapefileLoader<RouteAgent> loader;
>
>                try {
>                        URL fileURL = file.toURI().toURL();
>                        ShapefileDataStore store = new
> ShapefileDataStore(fileURL);
>                        FeatureCollection collection =
> store.getFeatureSource().getFeatures();
>                        loader = new
> ShapefileLoader<RouteAgent>(RouteAgent.class, fileURL,
> geography, this);
>                        FeatureIterator fIterator = collection.features();
>
>                        // logger.debug("Preparing to load
> "+collection.size()+" Route
> Agents...");
>                        System.out.println("Preparing to load
> "+collection.size()+" Route
> Agents...");
>
>                        while (loader.hasNext()) {
>                                Feature feature = fIterator.next();
>                                RouteAgent agent = new RouteAgent(
>
>  TopologyContext.extractFeatureId(feature),
>                                                (String)
> feature.getAttribute("entity"),
>                                                (String)
> feature.getAttribute("network"),
>                                                (String)
> feature.getAttribute("instalation"),
>
>  (Double)feature.getAttribute("length_m"));
>                                loader.next(agent);
>                                //logger.debug(agent.toString());
>                                //System.out.println(agent.toString());
>                                }
>
>                } catch (MalformedURLException e) {
>                        //logger.error(e, e);
>                        e.printStackTrace();
>                } catch (IOException e) {
>                        //logger.error(e, e);
>                        e.printStackTrace();
>                }
>        }
> <!-- CODE -->
>
> --
> View this message in context:
> http://old.nabble.com/GIS-Display---Shapefiles-and-Subcontexts-tp30849648p31489286.html
> Sent from the repast-interest mailing list archive at Nabble.com.
>
>
>
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