Subversion Repositories mkgmap

/*
 * Copyright (C) 2007 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: Dec 6, 2007
 */
package uk.me.parabola.mkgmap.filters;

import java.util.List;
import java.util.ArrayList;

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

/**
 * @author Steve Ratcliffe
 */
public class PolygonSplitterBase extends BaseFilter {
        protected static final int MAX_SIZE = 0xffff; // larger value causes problem in delta encoding of lines
        protected int shift;
        protected int resolution;
       
        public void init(FilterConfig config) {
                shift = config.getShift();
                resolution = config.getResolution();
        }
       
        /**
         * Split the given shape and place the resulting shapes in the outputs list.
         * @param shape The original shape (that is too big).
         * @param outputs The output list.
         */
        protected void split(MapShape shape, List<MapShape> outputs) {
                int dividingLine = 0;
                boolean isLongitude = false;
                Area bounds = shape.getBounds();
                if (bounds.getWidth() > bounds.getHeight()) {
                        isLongitude = true;
                        Area[] tmpAreas = bounds.split(2, 1, shift);
                        dividingLine = tmpAreas != null ? tmpAreas[0].getMaxLong() : (bounds.getMinLong() + bounds.getWidth() / 2);
                } else {
                        Area[] tmpAreas = bounds.split(1, 2, shift);
                        dividingLine = tmpAreas != null ? tmpAreas[0].getMaxLat() : (bounds.getMinLat() + bounds.getHeight() / 2);
                }
                List<List<Coord>> subShapePoints = new ArrayList<>();
                ShapeSplitter.splitShape(shape.getPoints(), dividingLine << Coord.DELTA_SHIFT, isLongitude, subShapePoints, subShapePoints, null);
                for (List<Coord> subShape : subShapePoints) {
                        MapShape s = shape.copy();
                        s.setPoints(subShape);
                        outputs.add(s);
                }
        }

}