[Geotools-devel] How I do to display multiple geometries?

[Amador A. C. <sph...@gm...>]

I've the follow code, but I can't add multiple geometries because my
SimpleFeatureType is "hard coded", how do I to load the type of feature
dinamyc?

package demo.geometry01;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LinearRing;
import com.vividsolutions.jts.geom.Polygon;
import org.geotools.data.DataUtilities;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureCollections;
import org.geotools.feature.simple.SimpleFeatureBuilder;

import org.geotools.geometry.jts.JTSFactoryFinder;
import org.geotools.map.DefaultMapContext;
import org.geotools.map.MapContext;
import org.geotools.swing.JMapFrame;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;

public class SimpleGeometryLab {

    GeometryFactory gf = JTSFactoryFinder.getGeometryFactory(null);
    FeatureCollection col = FeatureCollections.newCollection();
    SimpleFeatureBuilder sfb;
    FeatureCollection<SimpleFeatureType, SimpleFeature> miCol =
            FeatureCollections.newCollection();
    MapContext map;
    JMapFrame frame;

    public static void main(String[] args) throws Exception {
        SimpleGeometryLab me = new SimpleGeometryLab();
    }

    public SimpleGeometryLab() throws Exception {
        map = new DefaultMapContext();
        frame = new JMapFrame(map);
        map.setTitle("Geometrias simples");

        //Here my problem... ¬¬
        SimpleFeatureType TYPE = DataUtilities.createType(
                "Location",
                "location:Point:srid=4326,"
                + "name:String");
        sfb = new SimpleFeatureBuilder(TYPE);

        sfb.add(crearPunto(10, 30));
        sfb.add(crearLinea());
        SimpleFeature feat = sfb.buildFeature(null);
        miCol.add(feat);

        map.addLayer(miCol, null);
        frame.setSize(800, 600);
        frame.setVisible(true);
    }

    private Geometry crearPunto(int x, int y) {
        Coordinate c = new Coordinate(x, y);
        return gf.createPoint(c);
    }

    //Not in use
    private Geometry crearLinea() {
        Coordinate[] c = new Coordinate[]{
            new Coordinate(100, 112),
            new Coordinate(200, 100),
            new Coordinate(85, 46)
        };
        return gf.createLineString(c);
    }

    //Not in use
    private Geometry createCircle(double x, double y, final double r) {
        final int l = 32;
        Coordinate coords[] = new Coordinate[l + 1];
        for (int i = 0; i < l; i++) {
            double angle = ((double) i / (double) l) * Math.PI * 2.0;
            double dx = Math.cos(angle) * r;
            double dy = Math.sin(angle) * r;
            coords[i] = new Coordinate((double) x + dx, (double) y + dy);
        }
        coords[l] = coords[0];

        LinearRing ring = gf.createLinearRing(coords);
        Polygon polygon = gf.createPolygon(ring, null);

        return polygon;
    }

}

-- 
TSU. Amador Cuenca