Subversion Repositories mkgmap

/*
 * Copyright (C) 2006 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: 07-Dec-2006
 */
package uk.me.parabola.imgfmt.app.trergn;

import uk.me.parabola.imgfmt.app.ImgFileWriter;

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

/**
 * A zoom level (or map level) determines the amount of detail that
 * is shown as you zoom in and out.
 * Level 0 is the the most detailed level.
 *
 * A zoom level has a number of bits per co-ordinate and the number of
 * subdivisions at that level.
 *
 * The highest level must have one subdivision and have no elements I believe.
 *
 * @author Steve Ratcliffe
 */
public class Zoom {
        private final int level;
        private boolean inherited;

        private final int resolution;

        private final List<Subdivision> subdivs = new ArrayList<Subdivision>();

        /**
         * Create a new zoom level.
         *
         * @param zoom The level between 0 and 15.
         * @param resolution The number of bits per coordinate, up to 24.
         */
        Zoom(int zoom, int resolution) {
                this.level = zoom;
                this.resolution = resolution;
        }


        public Iterator<Subdivision> subdivIterator() {
                return subdivs.iterator();
        }

        public void setInherited(boolean inherited) {
                this.inherited = inherited;
        }


        public int getLevel() {
                return level;
        }

        public int getResolution() {
                return resolution;
        }

        public int getShiftValue() {
                return 24 - resolution;
        }

        public void write(ImgFileWriter file) {
                file.put((byte) ((level & 0xf) | (inherited ? 0x80 : 0)));
                file.put((byte) resolution);
                file.putChar((char) subdivs.size());
        }

        public String toString() {
                return "L " + level + ':' + resolution;
        }
       
        void addSubdivision(Subdivision div) {
                subdivs.add(div);
        }
}