Examples of org.geotools.styling.ExternalGraphic

org.geotools.styling.ExternalGraphic
l.opengeospatial.org/files/?artifact_id=1188"> OGC Styled-Layer Descriptor Report (OGC 02-070) version 1.0.0.:
```
 <xsd:element name="ExternalGraphic"> <xsd:annotation> <xsd:documentation> An "ExternalGraphic" gives a reference to an external raster or vector graphical object. </xsd:documentation> </xsd:annotation> <xsd:complexType> <xsd:sequence> <xsd:element ref="sld:OnlineResource"/> <xsd:element ref="sld:Format"/> </xsd:sequence> </xsd:complexType> </xsd:element> 
```
Renderers can use this information when displaying styled features, though it must be remembered that not all renderers will be able to fully represent strokes as set out by this interface. For example, opacity may not be supported.

Notes:
- The graphical parameters and their values are derived from SVG/CSS2 standards with names and semantics which are as close as possible.
@author James Macgill, CCG @source $URL$ @version $Id$

                }
                for( int i = 0; i < graphics.length; i++ ) {
                    if (graphics[i] != null) {
                        for( GraphicalSymbol gs : graphics[i].graphicalSymbols() ) {
                            if ((gs != null) && (gs instanceof ExternalGraphic)) {
                                ExternalGraphic externalGraphic = (ExternalGraphic) gs;
                                gList.add(externalGraphic);
                            }
                        }
                    }
                }

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     */
    public static List<ExternalGraphic> externalGraphicsFromGraphic( Graphic graphic ) {
        List<ExternalGraphic> gList = new ArrayList<ExternalGraphic>();
        for( GraphicalSymbol gs : graphic.graphicalSymbols() ) {
            if ((gs != null) && (gs instanceof ExternalGraphic)) {
                ExternalGraphic externalGraphic = (ExternalGraphic) gs;
                gList.add(externalGraphic);
            }
        }
        return gList;
    }

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        }


        PointSymbolizer pointSymbolizer = Utilities.pointSymbolizerFromRule(rule);
        Graphic graphic = SLDs.graphic(pointSymbolizer);
        graphic.graphicalSymbols().clear();
        ExternalGraphic exGraphic = sf.createExternalGraphic(externalGraphicsUrl, format);


        graphic.graphicalSymbols().add(exGraphic);
    }

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     * @return the generated style.
     * @throws IOException
     */
    public static StyleWrapper createStyleFromGraphic( File graphicsPath ) throws IOException {
        String name = graphicsPath.getName();
        ExternalGraphic exGraphic = null;
        if (name.toLowerCase().endsWith(".png")) {
            exGraphic = sf.createExternalGraphic(graphicsPath.toURI().toURL(), "image/png");
        } else if (name.toLowerCase().endsWith(".svg")) {
            exGraphic = sf.createExternalGraphic(graphicsPath.toURI().toURL(), "image/svg+xml");
        } else if (name.toLowerCase().endsWith(".sld")) {

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        public void visit( Graphic gr ) {
            List<GraphicalSymbol> graphicalSymbols = gr.graphicalSymbols();
            for( GraphicalSymbol graphicalSymbol : graphicalSymbols ) {
                if (graphicalSymbol instanceof ExternalGraphic) {
                    ExternalGraphic ext = (ExternalGraphic) graphicalSymbol;
                    ext.accept(this);
                }
            }
        }

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            // if the point symbolizer uses an external graphic use it
            if ((symbolizer.getGraphic() != null)
                    && (symbolizer.getGraphic().getExternalGraphics() != null)
                    && (symbolizer.getGraphic().getExternalGraphics().length > 0)) {
                ExternalGraphic graphic = symbolizer.getGraphic()
                        .getExternalGraphics()[0];


                try {
                    if ("file".equals(graphic.getLocation().getProtocol())) {
                        // it is a local file, reference locally from "styles"
                        // directory
                        File file = new File(graphic.getLocation().getFile());
                        iconHref = RequestUtils.baseURL(mapContext.getRequest()
                                .getHttpServletRequest())
                                + "styles/" + file.getName();
                    } else if ("http".equals(graphic.getLocation()
                            .getProtocol())) {
                        iconHref = graphic.getLocation().toString();
                    } else {
                        // TODO: should we check for http:// and use it
                        // directly?
                        // other protocols?
                    }

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        Graphic graphic = this.styleBuilder.createGraphic();
        graphic.graphicalSymbols().clear();
        if (styleJson.has(JSON_EXTERNAL_GRAPHIC)) {
            String externalGraphicUrl = validateURL(styleJson.getString(JSON_EXTERNAL_GRAPHIC));
            final String graphicFormat = getGraphicFormat(externalGraphicUrl, styleJson);
            final ExternalGraphic externalGraphic = this.styleBuilder.createExternalGraphic(externalGraphicUrl, graphicFormat);


            graphic.graphicalSymbols().add(externalGraphic);
        }


        if (styleJson.has(JSON_GRAPHIC_NAME)) {

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        final List<GraphicalSymbol> graphicalSymbols = graphic.graphicalSymbols();


        assertEquals(1, graphicalSymbols.size());


        ExternalGraphic externalGraphic = (ExternalGraphic) graphicalSymbols.get(0);
        assertEquals("image/png", externalGraphic.getFormat());
        assertEquals(getFile("mark.png"), new File(externalGraphic.getLocation().toURI()));
    }

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    }


    private static Style createPointStyle() {
        StyleFactory sf = CommonFactoryFinder.getStyleFactory();
        URL iconUrl = ScreenMapShapefileTest.class.getResource("icon.png");
        ExternalGraphic icon = sf.createExternalGraphic(iconUrl, "image/png");
        Graphic graphic = sf.createGraphic(new ExternalGraphic[] { icon }, null, null, null, null,
                null);
        PointSymbolizer symbolizer = sf.createPointSymbolizer(graphic, "the_geom");


        Rule rule = sf.createRule();

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        legend.setRotation(0);
        legend.setOpacity(1);
        Style pStyle = RendererBaseTest.loadStyle(this, "externalGraphic.sld");
        URL url = StreamingRenderer.class.getResource("test-data/");
        StyleFactory sf = CommonFactoryFinder.getStyleFactory(null);
        ExternalGraphic eg = sf.createExternalGraphic(url + "icon64.png", "image/png");
        legend.addExternalGraphic(eg);
        BufferedImage image = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = (Graphics2D) image.getGraphics();
        MathTransform transform = ProjectiveTransform.create(new AffineTransform());
        Decimator decimator = new Decimator(transform);

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