    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}