I need add a legend, banner and signature to my shp file which is exported in PDF.

My code:

HashMap<String, Object> params = new HashMap<>();
        params.put(ShapefileDataStoreFactory.URLP.key, URLs.fileToUrl(new File("D:/var/shp/poli_cercanos.shp")));
    DataStore ds = DataStoreFinder.getDataStore(params);
    SimpleFeatureCollection fc = ds.getFeatureSource(ds.getTypeNames()[0]).getFeatures();

MapContent mapContent = new MapContent();
Style style = SLD.createSimpleStyle(fc.getSchema());
Layer layer = new FeatureLayer(fc, style);

ByteArrayOutputStream baos = new ByteArrayOutputStream();

int w = 1000;
ReferencedEnvelope bounds = fc.getBounds();
int h = (int) (w * (bounds.getHeight() / bounds.getWidth()));
BufferedImage bufferedImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = bufferedImage.createGraphics();


mapContent.getViewport().setScreenArea(new Rectangle(Math.round(w), Math.round(h)));

g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

Rectangle outputArea = new Rectangle(w, h);

GTRenderer renderer = new StreamingRenderer();
LabelCacheImpl labelCache = new LabelCacheImpl();
Map<Object, Object> hints = renderer.getRendererHints();
if (hints == null) {
    hints = new HashMap<>();
hints.put(StreamingRenderer.LABEL_CACHE_KEY, labelCache);
renderer.paint(g2d, outputArea, bounds);
ImageIO.write(bufferedImage, "png", baos);

Document document = new Document(PageSize.A2, 20, 20, 20, 20);
PdfWriter.getInstance(document, new FileOutputStream("D:/var/shp/poli_cercanos.pdf"));
Image image = Image.getInstance(baos.toByteArray());

My pdf generates the following image from the shp file:

pdf content

Then the following would be to add a legend and a signature to the image, like this:

expected result


One of the joys of open source software is the easy you can "borrow" code from another project. GeoServer is built using GeoTools and can produce a legend graphic from a list of layers and styles. Much of the work for that can be found in BufferedImageLegendGraphicBuilder.

Once you have one or more legend images it's a simple case of learning how the iText PdfWriter works to lay out the boxes and text elements, probably with a table.

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