[Geotools-devel] GT2 - Basic Example

[Debasish S. <Deb...@rm...>]

Hi All:

Am trying to load a shapefile and then generate an image from it . When I
try to run I get the following error . I have attached the code for your
reference.

Sfh->Filecode 9994

Sfh->Filecode 9994

java.lang.NullPointerException

     at
org.geotools.renderer.RendererUtilities.applyFill(RendererUtilities.java:266)

     at
org.geotools.renderer.RenderedPolygon.render(RenderedPolygon.java:65)

     at
org.geotools.renderer.Java2DRenderer.processStylers(Java2DRenderer.java:404)

     at
org.geotools.renderer.Java2DRenderer.render(Java2DRenderer.java:222)

     at org.geotools.map.DefaultMap.render(DefaultMap.java:73)

     at GenMap.<init>(GenMap.java:49)

     at GenMap.main(GenMap.java:60)

Process exited with exit code 0.

import org.geotools.feature.*;
import org.geotools.map.*;
import org.geotools.renderer.*;
import org.geotools.shapefile.*;
import org.geotools.styling.*;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.net.*;
import javax.imageio.*;
import com.vividsolutions.jts.geom.Envelope;

import org.geotools.datasource.extents.*;
import org.geotools.data.*;
import org.geotools.filter.*;

public class GenMap {
    int width = 500;
    int height = 500;
    boolean transparent;

    public GenMap() {
        try {
            BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_ARGB);
            org.geotools.map.Map map = new DefaultMap();
            Java2DRenderer renderer = new Java2DRenderer();
            renderer.setOutput(image.getGraphics(), new
java.awt.Rectangle(width, height));

            ShapefileDataSource sds = new ShapefileDataSource(new URL
("file:///d:\\gisdata\\world\\country"));
            Envelope bbox = sds.getBbox(false);
            FeatureCollectionDefault fc = new
FeatureCollectionDefault(sds);

            //
            MemoryDataSource cache = new MemoryDataSource();
            GeometryFilter  filter = FilterFactory.createFilterFactory
().createGeometryFilter(AbstractFilter.GEOMETRY_BBOX);
            filter.addLeftGeometry(FilterFactory.createFilterFactory
().createBBoxExpression(bbox));

            FeatureCollection temp = sds.getFeatures(filter);
            Feature[] list = temp.getFeatures();

            for (int i = 0; i < list.length; i++) {
                cache.addFeature(list[i]);
            }


            //
            Style layerstyle = new BasicPolygonStyle();
            map.addFeatureTable(temp, layerstyle);
            map.render(renderer, sds.getBbox());

            File file = new File("d:\\temp\\mapinfo\\newimage.png");
            ImageIO.write(image, "png", file);
            System.out.println("Complete");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    public static void main(String[] args) {
        GenMap genMap = new GenMap();
    }
}


Best Regards

Debasish Sahu.
Senior Software Engineer
RMSI Pvt. Ltd.
A-7,Sector-16
Noida-201301.
Uttar Pradesh.India.
Phone :  +91-118-2511102
Fax :  +91-118-2511109
Website : http://www.rmsi.com