Examples with Drawer org.geotools.map.legend.Drawer used on opensource projects

Example 1 with Drawer

use of org.geotools.map.legend.Drawer in project hale by halestudio.

the class DefinitionImages method getLegendImage.

/**
 * Get a legend image for a given type definition
 *
 * @param type the type definition
 * @param dataSet the data set the type definition belongs to
 * @param definedOnly if only for defined styles a image shall be created
 * @return the legend image or <code>null</code>
 */
protected BufferedImage getLegendImage(TypeDefinition type, DataSet dataSet, boolean definedOnly) {
    StyleService ss = PlatformUI.getWorkbench().getService(StyleService.class);
    Style style = (definedOnly) ? (ss.getDefinedStyle(type)) : (ss.getStyle(type, dataSet));
    if (style == null) {
        return null;
    }
    // create a dummy feature based on the style
    Drawer d = Drawer.create();
    SimpleFeature feature = null;
    Symbolizer[] symbolizers = SLD.symbolizers(style);
    if (symbolizers.length > 0) {
        Symbolizer symbolizer = symbolizers[0];
        if (symbolizer instanceof LineSymbolizer) {
            feature = d.feature(d.line(LINE_POINTS));
        } else if (symbolizer instanceof PointSymbolizer) {
            feature = d.feature(d.point(WIDTH / 2, HEIGHT / 2));
        }
        if (symbolizer instanceof PolygonSymbolizer) {
            feature = d.feature(d.polygon(POLY_POINTS));
        }
    }
    if (feature != null) {
        BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_ARGB);
        // GraphicsEnvironment.getLocalGraphicsEnvironment().
        // getDefaultScreenDevice().getDefaultConfiguration().createCompatibleImage(WIDTH, HEIGHT,
        // Transparency.TRANSLUCENT);
        // use white background to have a neutral color even if selected
        Color bg = Color.WHITE;
        Graphics2D g = image.createGraphics();
        try {
            g.setColor(bg);
            g.fillRect(0, 0, WIDTH, HEIGHT);
        } finally {
            g.dispose();
        }
        d.drawDirect(image, feature, style);
        return image;
    }
    return null;
}