org.polymap.core.style.geotools.DefaultStyles.java Source code

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Here is the source code for org.polymap.core.style.geotools.DefaultStyles.java

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/* 
 * polymap.org
 * Copyright 2009, Polymap GmbH, and individual contributors as indicated
 * by the @authors tag.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 *
 * $Id$
 */

package org.polymap.core.style.geotools;

import java.awt.Color;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.geotools.data.FeatureSource;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.styling.FeatureTypeStyle;
import org.geotools.styling.Fill;
import org.geotools.styling.Graphic;
import org.geotools.styling.LineSymbolizer;
import org.geotools.styling.Mark;
import org.geotools.styling.PointSymbolizer;
import org.geotools.styling.PolygonSymbolizer;
import org.geotools.styling.Rule;
import org.geotools.styling.Stroke;
import org.geotools.styling.Style;
import org.geotools.styling.StyleFactory;
import org.opengis.feature.type.FeatureType;
import org.opengis.filter.FilterFactory;

import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.MultiLineString;
import com.vividsolutions.jts.geom.MultiPolygon;
import com.vividsolutions.jts.geom.Polygon;

/**
 * Provides default styles. 
 *
 * @author <a href="http://www.polymap.de">Falko Braeutigam</a>
 * @version POLYMAP3 ($Revision$)
 * @since 3.0
 */
public class DefaultStyles {

    private static Log log = LogFactory.getLog(DefaultStyles.class);

    protected StyleFactory styleFactory = CommonFactoryFinder.getStyleFactory(null);

    protected FilterFactory filterFactory = CommonFactoryFinder.getFilterFactory(null);

    public DefaultStyles() {
        super();
    }

    public Style createStyleWithFTS() {
        Style style = styleFactory.createStyle();
        FeatureTypeStyle fts = styleFactory.createFeatureTypeStyle(new Rule[] {});
        style.featureTypeStyles().add(fts);

        return style;
    }

    public Style findStyle(FeatureSource fs) {
        FeatureType schema = fs.getSchema();
        log.debug("    geometry type: " + schema.getGeometryDescriptor());

        Color baseColor = Color.RED;
        Style style = createStyleWithFTS();

        try {
            Class geomType = schema.getGeometryDescriptor().getType().getBinding();
            if (Polygon.class.isAssignableFrom(geomType) || MultiPolygon.class.isAssignableFrom(geomType)) {
                return createPolygonStyle(style);
            } else if (LineString.class.isAssignableFrom(geomType)
                    || MultiLineString.class.isAssignableFrom(geomType)) {
                return createLineStyle(style);
            } else {
                log.warn("No style for geomType: " + geomType.getName());
                return createPointStyle(style);
            }
        } catch (Exception e) {
            log.warn("", e);
            return createAllStyle();
        }
    }

    /**
     * Create a style that matches for everything.
     * 
     * @return Newly created style.
     */
    public Style createAllStyle() {
        Style style = createStyleWithFTS();
        createPolygonStyle(style);
        createLineStyle(style);
        createPointStyle(style);
        return style;
    }

    /**
     * Create a Style to draw polygon features with a thin blue outline and
     * a cyan fill
     */
    private Style createPolygonStyle(Style style) {

        // create a partially opaque outline stroke
        Stroke stroke = styleFactory.createStroke(filterFactory.literal(Color.DARK_GRAY),
                filterFactory.literal(0.5), filterFactory.literal(0.5));

        // create a partial opaque fill
        Fill fill = styleFactory.createFill(filterFactory.literal(Color.CYAN), filterFactory.literal(0.5));

        /*
         * Setting the geometryPropertyName arg to null signals that we want to
         * draw the default geometry of features
         */
        PolygonSymbolizer sym = styleFactory.createPolygonSymbolizer(stroke, fill, null);

        Rule rule = styleFactory.createRule();

        rule.setName("Rule for PolygonSymbolizer");
        rule.symbolizers().add(sym);

        style.featureTypeStyles().get(0).rules().add(rule);

        return style;
    }

    /**
     * Create a Style to draw line features as thin blue lines
     */
    private Style createLineStyle(Style style) {
        Stroke stroke = styleFactory.createStroke(filterFactory.literal(Color.DARK_GRAY),
                filterFactory.literal(0.5));

        /*
         * Setting the geometryPropertyName arg to null signals that we want to
         * draw the default geometry of features
         */
        LineSymbolizer sym = styleFactory.createLineSymbolizer(stroke, null);

        Rule rule = styleFactory.createRule();
        rule.symbolizers().add(sym);
        rule.setName("Rule for LineSymbolizer");

        style.featureTypeStyles().get(0).rules().add(rule);
        return style;
    }

    /**
     * Create a Style to draw point features as circles with blue outlines
     * and cyan fill
     */
    private Style createPointStyle(Style style) {
        Graphic gr = styleFactory.createDefaultGraphic();

        Mark mark = styleFactory.getCircleMark();

        mark.setStroke(styleFactory.createStroke(filterFactory.literal(Color.BLUE), filterFactory.literal(1)));

        mark.setFill(styleFactory.createFill(filterFactory.literal(Color.CYAN)));

        gr.graphicalSymbols().clear();
        gr.graphicalSymbols().add(mark);
        gr.setSize(filterFactory.literal(5));

        /*
         * Setting the geometryPropertyName arg to null signals that we want to
         * draw the default geometry of features
         */
        PointSymbolizer sym = styleFactory.createPointSymbolizer(gr, null);

        Rule rule = styleFactory.createRule();
        rule.symbolizers().add(sym);
        rule.setName("Rule for PointSymbolizer");

        style.featureTypeStyles().get(0).rules().add(rule);

        return style;
    }

}