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 $Id$

        assertSimpleStyle(collector);


        // check the symbolizer
        PolygonSymbolizer ps = (PolygonSymbolizer) collector.symbolizers.get(0);
        assertNull(ps.getStroke());
        ExternalGraphic eg = (ExternalGraphic) ps.getFill().getGraphicFill().graphicalSymbols()
                .get(0);
        assertEquals("colorblocks.png", eg.getOnlineResource().getLinkage().toString());
        assertEquals("image/png", eg.getFormat());
    }

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        assertEquals(32, (int) graphic.getSize().evaluate(null, Integer.class));


        // check the mark
        List<GraphicalSymbol> symbols = graphic.graphicalSymbols();
        assertEquals(1, symbols.size());
        ExternalGraphic eg = (ExternalGraphic) symbols.get(0);
        assertEquals("image/png", eg.getFormat());
        assertEquals("smileyface.png", eg.getOnlineResource().getLinkage().toString());
    }

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    public ExternalGraphic build() {
        if (unset) {
            return null;
        }
        ExternalGraphic externalGraphic;
        Collection<ColorReplacement> set = new HashSet<ColorReplacement>();
        for (ColorReplacementBuilder replacement : replacements) {
            set.add(replacement.build());
        }
        if (inline != null) {

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    }
    
    public void testCreateDynamicExternalGraphics() throws Exception {
        URL url = StreamingRenderer.class.getResource("test-data/");
        PointSymbolizer symb = sf.createPointSymbolizer();
        ExternalGraphic eg = sf.createExternalGraphic(url + "${icon}", "image/png");
        symb.getGraphic().addExternalGraphic(eg);
        
        GraphicStyle2D gs = (GraphicStyle2D) sld.createStyle(feature, symb, range);
        // make sure the style has been recognized as dynamic
        SymbolizerKey key = new SymbolizerKey(symb, range);

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    }
    
    public void testCreateDynamicExternalGraphicsVector() throws Exception {
        URL url = StreamingRenderer.class.getResource("test-data/");
        PointSymbolizer symb = sf.createPointSymbolizer();
        ExternalGraphic eg = sf.createExternalGraphic(url + "${icon}", "image/png");
        symb.getGraphic().addExternalGraphic(eg);
        sld.setVectorRenderingEnabled(true);
        
        GraphicStyle2D gs = (GraphicStyle2D) sld.createStyle(feature, symb, range);
        // make sure the style has been recognized as dynamic

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    }
    
    public void testDefaultSizeExternalGraphic() throws Exception {
        URL url = StreamingRenderer.class.getResource("test-data/");
        PointSymbolizer symb = sf.createPointSymbolizer();
        ExternalGraphic eg = sf.createExternalGraphic(url + "icon64.png", "image/png");
        symb.getGraphic().addExternalGraphic(eg);
        
        GraphicStyle2D gs = (GraphicStyle2D) sld.createPointStyle(feature, symb, range);
        BufferedImage img = gs.getImage();
        assertEquals(64, img.getHeight());

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    public void testCreateDynamicExternalFormat() throws Exception {
      feature.setAttribute("symb", "image/png");
        URL url = StreamingRenderer.class.getResource("test-data/");
        PointSymbolizer symb = sf.createPointSymbolizer();
        ExternalGraphic eg = sf.createExternalGraphic(url + "${icon}", "${symb}");
        symb.getGraphic().addExternalGraphic(eg);
        
        GraphicStyle2D gs = (GraphicStyle2D) sld.createStyle(feature, symb, range);
        // make sure the style has been recognized as dynamic
        SymbolizerKey key = new SymbolizerKey(symb, range);

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    }


    public void testResizeExternalGraphic() throws Exception {
        URL url = StreamingRenderer.class.getResource("test-data/");
        PointSymbolizer symb = sf.createPointSymbolizer();
        ExternalGraphic eg = sf.createExternalGraphic(url + "icon64.png", "image/png");
        symb.getGraphic().graphicalSymbols().add(eg);
        symb.getGraphic().setSize(ff.literal(20));
        
        GraphicStyle2D gs = (GraphicStyle2D) sld.createPointStyle(feature, symb, range);
        BufferedImage img = gs.getImage();

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    }
    
    public void testResizeGraphicFill() throws Exception {
        URL url = StreamingRenderer.class.getResource("test-data/");
        PolygonSymbolizer symb = sf.createPolygonSymbolizer();
        ExternalGraphic eg = sf.createExternalGraphic(url + "icon64.png", "image/png");
        Graphic g = sf.createGraphic(new ExternalGraphic[] {eg}, null, null, null, ff.literal(20), null);
        Fill fill = sf.createFill(null, null, null, g);
        symb.setFill(fill);
        
        PolygonStyle2D ps = sld.createPolygonStyle(feature, symb, range);

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     }
    
    
     public void testFallbackGraphicMark() throws Exception {
         PointSymbolizer symb = sf.createPointSymbolizer();
         ExternalGraphic eg = sf.createExternalGraphic("http://foo.com/invalid_or_missing_image_url", null);
         symb.getGraphic().graphicalSymbols().add(eg);
         
         Style2D icon = sld.createPointStyle(feature, symb, range);
         assertNotNull(icon);
     }

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