[Geotools-gt2-users] DisplayJAI vs. GTRenderer.paint performance

[Diego Fdez . Durán]

Hi all:

 I'm using ImageMosaic to load a GeoTiff index shapefile (9 GeoTiffs,
total size of 146889x92337). If I display the resulting map using
DisplayJAI I get an optimal performance but I need to use
StreamingRenderer.render method to display multiple layers above the
raster image. With StreamingRenderer.render I get really poor
performance. Am I using GeoTools in the right way?

 P.S.- I think that I'm missunderstanding (or not understanding at all the
RasterSimbolizer part) because I get some kind of inverted colors.

 Thanks in advance.

-- Here is my code (I'm using GeoTools 2.3.5)

public class PanelGeoMap extends JPanel implements MouseMotionListener {

    private class PanelMap extends JPanel {

        @Override
        public void paint(Graphics g) {
            try {
                Graphics2D g2d = (Graphics2D) g;
                Rectangle rectangle = new Rectangle(getSize());

                //System.out.println("Map size (px): " + rectangle.height
+ "x" + rectangle.width);

                renderer.paint(g2d, rectangle, mapContext.getLayerBounds());
            } catch (IOException ex) {
                Logger.getLogger(PanelGeoMap.class.getName()).log(Level.SEVERE,
null, ex);
            }
        }
    }

    private PanelMap panelMap;
    private JScrollPane scrollPaneMap;

    private Dimension preferredSizeMaximum;

    private CoordinateReferenceSystem crs;
    private GTRenderer renderer;
    private Envelope env;
    private DefaultMapContext mapContext;

    public PanelGeoMap() {
        renderer = new StreamingRenderer();

        File file = null;
        JFileChooser fc = new JFileChooser();
        int ret = fc.showOpenDialog(this);

        if (ret == JFileChooser.APPROVE_OPTION) {
            file = fc.getSelectedFile();
        } else {
            System.exit(0);
        }

        AbstractGridCoverage2DReader reader;
        try {
            //reader = new GeoTiffReader(file, new
Hints(Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE));
            reader = new ImageMosaicReader(file, new
Hints(Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE));
        } catch (IOException ex) {
            ex.printStackTrace();
            return;
        }

        GridCoverage2D coverage;
        try {
            coverage = (GridCoverage2D) reader.read(null);
        } catch (IOException ex) {
            ex.printStackTrace();
            return;
        }

        crs = coverage.getCoordinateReferenceSystem();
        env = coverage.getEnvelope();
        RenderedImage image = coverage.getRenderedImage();

        StyleBuilder styleBuilder = new StyleBuilder();

        ColorMap cm = styleBuilder.createColorMap(
                new String[]{"0", "255"},
                new double[]{0, 255},
                new Color[]{ new Color(0, 0, 0),
                             new Color(255, 255, 255)},
                ColorMap.TYPE_RAMP);                    // XXX: ?


        RasterSymbolizer rs = styleBuilder.createRasterSymbolizer(cm, 1);
        Style st = styleBuilder.createStyle(rs);

        mapContext = new DefaultMapContext(crs);
        mapContext.addLayer(reader, st);
        renderer.setContext(mapContext);

        RenderingHints hints = new
RenderingHints(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_SPEED);
        renderer.setJava2DHints(hints);
        Map renderParams = new HashMap();
        renderParams.put("optimizedDataLoadingEnabled", new Boolean(true));
        renderer.setRendererHints(renderParams);

        int width = image.getWidth();
        int height = image.getHeight();

        /* Debug */
        JFrame frameJAI = new JFrame("DisplayJAI");
        frameJAI.getContentPane().add(new JScrollPane(new
DisplayJAI(image)));
        frameJAI.setVisible(true);

        System.out.println("Image size: " + width + "x" + height);

        panelMap = new PanelMap();
        panelMap.addMouseMotionListener(this);
        preferredSizeMaximum = new Dimension(width, height);
        panelMap.setPreferredSize(preferredSizeMaximum);

        scrollPaneMap = new JScrollPane(panelMap);
        
scrollPaneMap.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        
scrollPaneMap.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
        scrollPaneMap.setAutoscrolls(true);

        add(scrollPaneMap, BorderLayout.CENTER);
    }

    public void zoomIn() {
        Dimension preferredSizeActual = panelMap.getPreferredSize();

        panelMap.setPreferredSize(new Dimension(preferredSizeActual.width
- 2000, preferredSizeActual.height - 2000));
        panelMap.revalidate();
    }

    public void zoomOut() {
        Dimension preferredSizeActual = panelMap.getPreferredSize();
    }

    public void mouseDragged(MouseEvent e) {
        System.out.println("Dragging " + e.getX() + " " + e.getY());
        Rectangle r = new Rectangle(e.getX(), e.getY(), 1, 1);
        scrollPaneMap.scrollRectToVisible(r);
    }

    public void mouseMoved(MouseEvent e) {

    }
}

-- 
Diego Fdez. Durán <[EMAIL PROTECTED]> | http://www.goedi.net
GPG : 925C 9A21 7A11 3B13 6E43 50DB F579 D119 90D2 66BB





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