Examples of org.geotools.styling.ColorMap

org.geotools.styling.ColorMap
The ColorMap element defines either the colors of a palette-type raster source or the mapping of fixed-numeric pixel values to colors.
```
 <xs:element name="ColorMap"> <xs:complexType> <xs:choice minOccurs="0" maxOccurs="unbounded"> <xs:element ref="sld:ColorMapEntry"/> </xs:choice> </xs:complexType> </xs:element> 
```
For example, a DEM raster giving elevations in meters above sea level can be translated to a colored image with a ColorMap. The quantity attributes of a color-map are used for translating between numeric matrixes and color rasters and the ColorMap entries should be in order of increasing numeric quantity so that intermediate numeric values can be matched to a color (or be interpolated between two colors). Labels may be used for legends or may be used in the future to match character values. Not all systems can support opacity in colormaps. The default opacity is 1.0 (fully opaque). Defaults for quantity and label are system-dependent. @source $URL$

        assertNotNull(rs.getContrastEnhancement());
        assertEquals(ContrastMethod.NORMALIZE, rs.getContrastEnhancement().getMethod());
        assertEquals(0.5, rs.getContrastEnhancement().getGammaValue().evaluate(null, Double.class),
                0.0);
        assertNull(rs.getChannelSelection());
        ColorMap cmap = rs.getColorMap();
        assertEquals(ColorMap.TYPE_RAMP, cmap.getType());
        assertFalse(cmap.getExtendedColors());
        assertEntry("#008000", 70.0, 1.0, null, cmap.getColorMapEntry(0));
        assertEntry("#663333", 256.0, 1.0, null, cmap.getColorMapEntry(1));
    }

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        assertSimpleStyle(collector);


        // check the symbolizer
        RasterSymbolizer rs = (RasterSymbolizer) collector.symbolizers.get(0);
        assertNull(rs.getChannelSelection());
        ColorMap cmap = rs.getColorMap();
        assertEquals(ColorMap.TYPE_RAMP, cmap.getType());
        assertFalse(cmap.getExtendedColors());
        assertEquals(3, cmap.getColorMapEntries().length);
        assertEntry("#0000FF", 150.0, 1.0, null, cmap.getColorMapEntry(0));
        assertEntry("#FFFF00", 200.0, 1.0, null, cmap.getColorMapEntry(1));
        assertEntry("#FF0000", 250.0, 1.0, null, cmap.getColorMapEntry(2));
    }

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        assertSimpleStyle(collector);


        // check the symbolizer
        RasterSymbolizer rs = (RasterSymbolizer) collector.symbolizers.get(0);
        assertNull(rs.getChannelSelection());
        ColorMap cmap = rs.getColorMap();
        assertEquals(ColorMap.TYPE_RAMP, cmap.getType());
        assertFalse(cmap.getExtendedColors());
        assertEquals(2, cmap.getColorMapEntries().length);
        assertEntry("#008000", 70.0, 1.0, null, cmap.getColorMapEntry(0));
        assertEntry("#008000", 256.0, 0.0, null, cmap.getColorMapEntry(1));
    }

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        assertSimpleStyle(collector);


        // check the symbolizer
        RasterSymbolizer rs = (RasterSymbolizer) collector.symbolizers.get(0);
        assertNull(rs.getChannelSelection());
        ColorMap cmap = rs.getColorMap();
        assertEquals(ColorMap.TYPE_INTERVALS, cmap.getType());
        assertFalse(cmap.getExtendedColors());
        assertEquals(2, cmap.getColorMapEntries().length);
        assertEntry("#008000", 150.0, 1.0, null, cmap.getColorMapEntry(0));
        assertEntry("#663333", 256.0, 1.0, null, cmap.getColorMapEntry(1));
    }

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    @Test
    public void testSVG () throws FileNotFoundException, IOException, SAXException, ParserConfigurationException {
        final File svgFile = TestData.file(this, "sample.svg");
        GradientColorMapGenerator colorMapGenerator = GradientColorMapGenerator.getColorMapGenerator(svgFile);
        ColorMap colorMap = colorMapGenerator.generateColorMap(10, 80);
        assertNotNull(colorMap);
        ColorMapEntry[] colorEntries = colorMap.getColorMapEntries();
        assertNotNull(colorEntries);
        assertEquals(6, colorEntries.length);


        // First and last color entry are transparent
        assertEquals("0", colorEntries[0].getOpacity().toString());

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    }


    @Test
    public void testHEXcolors () throws FileNotFoundException, IOException, SAXException, ParserConfigurationException {
        GradientColorMapGenerator colorMapGenerator = GradientColorMapGenerator.getColorMapGenerator("#0000ff;#00ffff;#ffff00;#ff0000");
        ColorMap colorMap = colorMapGenerator.generateColorMap(10, 100);
        assertNotNull(colorMap);
        ColorMapEntry[] colorEntries = colorMap.getColorMapEntries();
        assertNotNull(colorEntries);
        assertEquals(6, colorEntries.length);


        // First and last color entry are transparent
        assertEquals("0", colorEntries[0].getOpacity().toString());

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    rsb_1.setChannelSelection(chSel);
    rsb_1.setOpacity(sldBuilder.literalExpression(1.0));
    
    rsb_1.setOverlap(sldBuilder.literalExpression("AVERAGE"));
    
    final ColorMap cm = sldBuilder.createColorMap(
        new String[] { // labels
          "category",
          "category",
          "category"
        },

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    rsb_1.setChannelSelection(chSel);
    rsb_1.setOpacity(sldBuilder.literalExpression(1.0));
    rsb_1.setContrastEnhancement(cntEnh);
    rsb_1.setOverlap(sldBuilder.literalExpression("AVERAGE"));


    final ColorMap cm = sldBuilder.createColorMap(
        new String[] { // labels
          "category",
          "category",
          "category"
        },

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                // build the RasterSymbolizer
                StyleBuilder sldBuilder = new StyleBuilder();
                rsh = new RasterSymbolizerHelper(gc, null);
                rs = sldBuilder.createRasterSymbolizer();
                final ColorMap cm = sldBuilder.createColorMap(
                                new String[] { // labels
                                        "category0",
                                        "category1",
                                        "category2"
                                },
                                new double[] { // quantities
                                        100.0,
                                        500.0,
                                        900.0
                                },
                                new Color[] { // colors
                                        new Color(255,0,0,255),
                                        new Color(0,255,0,(int) (255*0.8)),
                                        new Color(0,0,255,(int) (255*0.2))
                                },
                                ColorMap.TYPE_RAMP);
                cm.setExtendedColors(true);
                rs.setColorMap(cm);


                // visit the RasterSymbolizer
                rsh.visit(rs);
                IndexColorModel icm2 = (IndexColorModel) ((GridCoverage2D)rsh.getOutput()).getRenderedImage().getColorModel();

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    final SelectedChannelType chTypeGray = new SelectedChannelTypeImpl();
    chTypeGray.setChannelName("1");
    chSel.setGrayChannel(chTypeGray);
    rsb_1.setChannelSelection(chSel);
    rsb_1.setOpacity(sldBuilder.literalExpression(1.0));
    final ColorMap cm = sldBuilder.createColorMap(
        new String[] { // labels
          "category",
          "category",
          "category"
        },

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Related Classes of org.geotools.styling.ColorMap

org.geoserver.sldservice.rest.resource.RasterizerResource

org.geoserver.w3ds.styles.SLD3DParser

org.geoserver.wms.dynamic.legendgraphic.DynamicColorMapBuilder

org.geoserver.wms.legendgraphic.RasterLayerLegendHelper

org.geotools.process.raster.DynamicColorMapTest

org.geotools.renderer.lite.gridcoverage2d.GradientColorMapGenerator

org.geotools.renderer.lite.gridcoverage2d.GradientColorMapGeneratorTest

org.geotools.renderer.lite.gridcoverage2d.RasterSymbolizerHelper

org.geotools.renderer.lite.gridcoverage2d.RasterSymbolizerTest

org.geotools.renderer.lite.GridCoverageRendererTest

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