Subversion Repositories mkgmap

/*
 * Copyright (C) 2008 Steve Ratcliffe
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program 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 General Public License for more details.
 *
 *
 * Author: Steve Ratcliffe
 * Create date: 08-Nov-2008
 */
package uk.me.parabola.mkgmap.general;

import java.util.List;

import uk.me.parabola.util.ShapeSplitter;
import uk.me.parabola.imgfmt.app.Area;
import uk.me.parabola.imgfmt.app.Coord;

/**
 * Clip objects to a bounding box.
 *
 * TODO: migrate LineClipper and PolygonClipper into here and simplify.
 * Actually, PolygonClipper functionality now in ShapeSplitter and it
 * is redundant
 *
 * @author Steve Ratcliffe
 */
public class AreaClipper implements Clipper {
        private final Area bbox;

        public AreaClipper(Area bbox) {
                this.bbox = bbox;
        }

        public void clipLine(MapLine line, LineAdder collector) {
                if (bbox == null || bbox.insideBoundary(line.getBounds())){
                        collector.add(line);
                        return;
                }
                List<List<Coord>> list = LineClipper.clip(bbox, line.getPoints());
                if (list == null) {
                        collector.add(line);
                } else {
                        for (List<Coord> lco : list) {
                                MapLine nline = line.copy();
                                nline.setPoints(lco);
                                collector.add(nline);
                        }
                }
        }

        public void clipShape(MapShape shape, MapCollector collector) {
                if (bbox == null || bbox.contains(shape.getBounds())){
                        collector.addShape(shape);
                        return;
                }
                List<List<Coord>> list = ShapeSplitter.clipToBounds(shape.getPoints(), bbox, null);
                // Should we share new points on the edge?
                for (List<Coord> lco : list) {
                        MapShape nshape = new MapShape(shape);
                        nshape.setPoints(lco);
                        nshape.setClipped(true);
                        collector.addShape(nshape);
                }
        }

        public boolean contains(Coord location) {
                return bbox == null || bbox.contains(location);
        }
}