[Geotools-gt2-users] How to add polygons on existing map?

[starscream <ni...@ho...>]

Hi all,

I'm working on a school project and untill now I have written my code,
thanks to geotools tutorials, to build a map, and it works perfectly! Now I
want to know how can I add some polygons on the layer of the map without
losing them when I zoom in/out? I want to do this because I have an Excel
file with some cities coordinates and I want to show them on the map!

I've written this code:

import java.awt.Color;
import java.awt.Point;
import java.io.File;

import org.geotools.data.FeatureSource;
import org.geotools.data.FileDataStore;
import org.geotools.data.FileDataStoreFinder;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.feature.FeatureCollections;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
import org.geotools.geometry.jts.JTSFactoryFinder;
import org.geotools.geometry.jts.WKTReader2;
import org.geotools.map.DefaultMapContext;
import org.geotools.map.FeatureLayer;
import org.geotools.map.Layer;
import org.geotools.map.MapContext;
import org.geotools.referencing.crs.DefaultGeographicCRS;
import org.geotools.styling.PolygonSymbolizer;
import org.geotools.styling.SLD;
import org.geotools.styling.StyleBuilder;
import org.geotools.swing.JMapFrame;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.style.Style;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.io.ParseException;
import com.vividsolutions.jts.io.WKTReader;
import com.vividsolutions.jts.util.GeometricShapeFactory;

public class GIS{
        public static void main(String[] args) throws Exception {
                usingFeatureCaching();
        }
       
        public static void usingFeatureCaching() throws Exception {

                File file = new File("C:\\PE\\reg2011_g.shp");
                FileDataStore store =
FileDataStoreFinder.getDataStore(file);
                FeatureSource featureSource = store.getFeatureSource();
                // Creates a map and adds the shape file
                MapContext map = new DefaultMapContext();
                map.setTitle("La mappa dei Comuni d'Italia");
               
                //Creates the map style
                StyleBuilder sb = new StyleBuilder();
                PolygonSymbolizer restrictedSymb =
sb.createPolygonSymbolizer(Color.LIGHT_GRAY, Color.BLACK, 0);
                //Sets opacity
               
restrictedSymbreg2011_g.shp.getFill().setOpacity(sb.literalExpression(0.5));
                org.geotools.styling.Style restrictedStyle =
sb.createStyle(restrictedSymb);

                //Adds the layer to the map
                map.addLayer(featureSource, restrictedStyle);
               
               
                map.addLayer(getCitiesLayer());  //?????????????

                // Visualizza la Mappa
                JMapFrame.showMap(map);
        }
       
        public static Layer getCitiesLayer(){

            SimpleFeatureTypeBuilder b = new SimpleFeatureTypeBuilder();
            GeometryFactory geomFactory = new GeometryFactory();

            b.setName( "pictures" );
            b.setCRS( DefaultGeographicCRS.WGS84);
           
            //picture location
            b.add( "geom", Point.class );
           
            final SimpleFeatureType TYPE = b.buildFeatureType();

            SimpleFeatureCollection collection =
FeatureCollections.newCollection("internal");
            WKTReader2 wkt = new WKTReader2();
           
            // Simple point coordinates (is an example)
        float lat = (float) 508469.7040;
        float lng = (float) 4358409.7367;
       
        com.vividsolutions.jts.geom.Point point1 = geomFactory.createPoint(
new Coordinate(lat,lng));
       

        //on this lin there is an error which dont let me compile the
program
        collection.add(SimpleFeatureBuilder.build(TYPE, new Object[]{
point1, "first"}, null));
               
            Style style = SLD.createPointStyle("Star", Color.BLUE,
Color.BLUE, 0.3f, 15);

            Layer citiesLayer = new FeatureLayer(collection,
(org.geotools.styling.Style) style);

            citiesLayer.setTitle("Cities layer");

            return citiesLayer;

        }

}

Can you help me please? 



--
View this message in context: http://osgeo-org.1560.n6.nabble.com/How-to-add-polygons-on-existing-map-tp5027259.html
Sent from the geotools-gt2-users mailing list archive at Nabble.com.