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      1 /*
      2  * Copyright (c) 2009-2010 jMonkeyEngine
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  * * Redistributions of source code must retain the above copyright
     10  *   notice, this list of conditions and the following disclaimer.
     11  *
     12  * * Redistributions in binary form must reproduce the above copyright
     13  *   notice, this list of conditions and the following disclaimer in the
     14  *   documentation and/or other materials provided with the distribution.
     15  *
     16  * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
     17  *   may be used to endorse or promote products derived from this software
     18  *   without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 package com.jme3.collision.bih;
     34 
     35 import com.jme3.math.Vector3f;
     36 import java.util.Comparator;
     37 
     38 public class TriangleAxisComparator implements Comparator<BIHTriangle> {
     39 
     40     private final int axis;
     41 
     42     public TriangleAxisComparator(int axis){
     43         this.axis = axis;
     44     }
     45 
     46     public int compare(BIHTriangle o1, BIHTriangle o2) {
     47         float v1, v2;
     48         Vector3f c1 = o1.getCenter();
     49         Vector3f c2 = o2.getCenter();
     50         switch (axis){
     51             case 0: v1 = c1.x; v2 = c2.x; break;
     52             case 1: v1 = c1.y; v2 = c2.y; break;
     53             case 2: v1 = c1.z; v2 = c2.z; break;
     54             default: assert false; return 0;
     55         }
     56         if (v1 > v2)
     57             return 1;
     58         else if (v1 < v2)
     59             return -1;
     60         else
     61             return 0;
     62     }
     63 }