Examples of org.geoserver.wms.legendgraphic.BufferedImageLegendGraphicBuilder

org.geoserver.wms.legendgraphic.BufferedImageLegendGraphicBuilder
eotools.org/geotools/trunk/gt/module/main/src/org/geotools /renderer/lite/StyledShapePainter.java StyledShapePainter} that produces a BufferedImage with theappropiate legend graphic for a given GetLegendGraphic WMS request.
It should be enough for a subclass to implement {@linkPlain org.vfny.geoserver.responses.wms.GetLegendGraphicProducer#writeTo(OutputStream)} andgetContentType() in order to encode the BufferedImage produced by this class to the appropiate output format.

This class takes literally the fact that the arguments WIDTH and HEIGHT are just hints about the desired dimensions of the produced graphic, and the need to produce a legend graphic representative enough of the SLD style for which it is being generated. Thus, if no RULE parameter was passed and the style has more than one applicable Rule for the actual scale factor, there will be generated a legend graphic of the specified width, but with as many stacked graphics as applicable rules were found, providing by this way a representative enough legend.
@author Gabriel Roldan @author Simone Giannecchini, GeoSolutions SAS @version $Id: BufferedImageLegendGraphicBuilder.java 15163 2010-12-13 16:38:00Z aaime $

            Rule[] applicableRules = LegendUtils.getApplicableRules(layer.getStyle().featureTypeStyles().toArray(new FeatureTypeStyle[0]), scaleDenominator);
            if ((!layers.isEmpty() && !layers.contains(layer.getTitle())) || applicableRules.length == 0) {
                continue;
            }


            BufferedImageLegendGraphicBuilder legendGraphicBuilder = new BufferedImageLegendGraphicBuilder();
            GetLegendGraphicRequest request = new GetLegendGraphicRequest();
            request.setLayer(layer.getFeatureSource().getSchema());
            request.setTransparent(true);
            request.setScale(scaleDenominator);
            request.setStyle(layer.getStyle());


            Map legendOptions = new CaseInsensitiveMap(options);
            legendOptions.putAll(mapContext.getRequest().getFormatOptions());
            request.setLegendOptions(legendOptions);


            LayerLegend legend = new LayerLegend();
            legend.request = request;


            String title = findTitle(layer, wms.getGeoServer().getCatalog());
            if (title != null) {
                Font newFont = LegendUtils.getLabelFont(request);
                newFont = newFont.deriveFont(Font.BOLD);
                newFont = newFont.deriveFont((float) newFont.getSize() + 2);


                Font oldFont = g2d.getFont();
                g2d.setFont(newFont);
                if (LegendUtils.isFontAntiAliasing(legend.request)) {
                    g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
                            RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
                } else {
                    g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
                            RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
                }


                BufferedImage titleImage = LegendUtils.renderLabel(title, g2d, request);
                g2d.setFont(oldFont);


                legend.title = titleImage;
            }


            BufferedImage legendImage = legendGraphicBuilder.buildLegendGraphic(request);
            legend.legend = legendImage;


            layerLegends.add(legend);
        }

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                                request.setStrict(false);
                                Map<String, String> legendOptions = new HashMap<String, String>();
                                legendOptions.put("forceLabels", "on");
                                legendOptions.put("fontAntiAliasing", "true");
                                request.setLegendOptions(legendOptions);
                                BufferedImageLegendGraphicBuilder builder = new BufferedImageLegendGraphicBuilder();
                                BufferedImage image = builder.buildLegendGraphic(request);


                                ByteArrayOutputStream bos = new ByteArrayOutputStream();


                                ImageIO.write(image, "PNG", bos);
                                return bos.toByteArray();

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