001/* ===========================================================
002 * Orson Charts : a 3D chart library for the Java(tm) platform
003 * ===========================================================
004 * 
005 * (C)opyright 2013-2016, by Object Refinery Limited.  All rights reserved.
006 * 
007 * http://www.object-refinery.com/orsoncharts/index.html
008 * 
009 * This program is free software: you can redistribute it and/or modify
010 * it under the terms of the GNU General Public License as published by
011 * the Free Software Foundation, either version 3 of the License, or
012 * (at your option) any later version.
013 *
014 * This program is distributed in the hope that it will be useful,
015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017 * GNU General Public License for more details.
018 *
019 * You should have received a copy of the GNU General Public License
020 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
021 * 
022 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
023 * Other names may be trademarks of their respective owners.]
024 * 
025 * If you do not wish to be bound by the terms of the GPL, an alternative
026 * commercial license can be purchased.  For details, please see visit the
027 * Orson Charts home page:
028 * 
029 * http://www.object-refinery.com/orsoncharts/index.html
030 * 
031 */
032
033package com.orsoncharts.graphics3d;
034
035import java.util.Comparator;
036
037/**
038 * A comparator that orders {@link Face} instances by Z-order.
039 */
040public class ZOrderComparator implements Comparator<Face> {
041
042    Point3D[] pts;
043    
044    /**
045     * Creates a new comparator.
046     * 
047     * @param pts  the points. 
048     */
049    public ZOrderComparator(Point3D[] pts) {
050        this.pts = pts;
051    }
052    
053    /* (non-Javadoc)
054     * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
055     */
056    @Override
057    public int compare(Face f1, Face f2) {
058        double z1 = f1.calculateAverageZValue(this.pts);
059        double z2 = f2.calculateAverageZValue(this.pts);
060        if (z1 > z2) {
061            return 1;
062        } else if (z2 > z1) {
063            return -1;
064        } else {
065            return 0;
066        }
067    }
068   
069}