jflowmap.models.map.MapArea.java Source code

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Here is the source code for jflowmap.models.map.MapArea.java

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/*
 * This file is part of JFlowMap.
 *
 * Copyright 2009 Ilya Boyandin
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package jflowmap.models.map;

import java.awt.geom.GeneralPath;
import java.awt.geom.Path2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.List;

import jflowmap.geo.MapProjection;

import org.apache.log4j.Logger;

import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.vividsolutions.jts.geom.Geometry;

/**
 * @author Ilya Boyandin
 *     Date: 25-Sep-2009
 */
public class MapArea {

    private static Logger logger = Logger.getLogger(MapArea.class);

    private final String id;
    private final String name;
    private final Polygon[] polygons;

    public MapArea(String id, String name, Iterable<Polygon> polygons) {
        this(id, name, Iterables.toArray(polygons, Polygon.class), false);
    }

    public MapArea(String id, String name, Polygon[] polygons) {
        this(id, name, polygons, true);
    }

    private MapArea(String id, String name, Polygon[] polygons, boolean clone) {
        this.id = id;
        this.name = name;
        if (clone) {
            this.polygons = polygons.clone();
        } else {
            this.polygons = polygons;
        }
    }

    public String getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public Polygon[] getPolygons() {
        return polygons.clone();
    }

    public boolean isEmpty() {
        for (Polygon p : polygons) {
            if (!p.isEmpty())
                return false;
        }
        return true;
    }

    public Path2D asPath(MapProjection proj) {
        GeneralPath path = new GeneralPath();
        for (Polygon poly : polygons) {
            Point2D[] points = poly.getPoints();
            Point2D startP = proj.project(points[0].getX(), points[0].getY());
            path.moveTo(startP.getX(), startP.getY());
            for (int i = 1; i < points.length; i++) {
                Point2D p = proj.project(points[i].getX(), points[i].getY());
                path.lineTo(p.getX(), p.getY());
            }
        }
        return path;
    }

    public Rectangle2D asBoundingBox(MapProjection proj) {
        Rectangle2D.Double bb = null;
        for (Polygon poly : polygons) {
            for (Point2D point : poly.getPoints()) {
                Point2D p = proj.project(point.getX(), point.getY());
                if (bb == null) {
                    bb = new Rectangle2D.Double(p.getX(), p.getY(), 0, 0);
                } else {
                    if (!bb.contains(p)) {
                        bb.add(p);
                    }
                }
            }
        }
        return bb;
    }

    public static MapArea fromGeometry(String id, String name, Geometry g) {
        List<Polygon> list = Lists.newArrayList();

        if (g.getGeometryType().equals("Polygon")) {
            list.add(Polygon.convert((com.vividsolutions.jts.geom.Polygon) g));
        } else if (g.getGeometryType().equals("MultiPolygon")) {
            for (int i = 0; i < g.getNumGeometries(); i++) {
                list.add(Polygon.convert((com.vividsolutions.jts.geom.Polygon) g.getGeometryN(i)));
            }
        } else {
            logger.warn("Skipping unsupported geometry type: " + g.getGeometryType());
        }

        return new MapArea(id, name, list);
    }

}