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}