01: /*
02: * $RCSfile: SimpleDistanceComparator.java,v $
03: *
04: * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: *
10: * - Redistribution of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: *
13: * - Redistribution in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in
15: * the documentation and/or other materials provided with the
16: * distribution.
17: *
18: * Neither the name of Sun Microsystems, Inc. or the names of
19: * contributors may be used to endorse or promote products derived
20: * from this software without specific prior written permission.
21: *
22: * This software is provided "AS IS," without a warranty of any
23: * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
24: * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
25: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
26: * EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
27: * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
28: * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
29: * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
30: * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
31: * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
32: * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
33: * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
34: * POSSIBILITY OF SUCH DAMAGES.
35: *
36: * You acknowledge that this software is not designed, licensed or
37: * intended for use in the design, construction, operation or
38: * maintenance of any nuclear facility.
39: *
40: * $Revision: 1.4 $
41: * $Date: 2007/02/09 17:20:42 $
42: * $State: Exp $
43: */
44:
45: package com.sun.j3d.utils.scenegraph.transparency;
46:
47: import java.util.Comparator;
48: import javax.media.j3d.Transform3D;
49:
50: /**
51: * Sample TransparencySortComparator which has the same functionality as
52: * the fixed default function in Java 3D.
53: *
54: * @since Java 3D 1.4
55: */
56: public class SimpleDistanceComparator implements Comparator {
57:
58: /** Creates a new instance of SimpleDistanceComparator */
59: public SimpleDistanceComparator() {
60: }
61:
62: /**
63: * Compares its two arguments for order. Returns a negative integer, zero,
64: * or a positive integer as the first argument is less than (closer to the viewer),
65: * equal to, or greater than (further from the viewer) the second argument.
66: *
67: * The compare method will be called with 2 objects of type
68: * TransparencySortGeom and it's result should indicate which object is
69: * closer to the viewer. Object1 < Object2 if it is to be considered closer
70: * and rendered after.
71: *
72: * @param o1 TransparencySortGeom object 1
73: * @param o2 TransparencySortGeom object 2
74: *
75: */
76: public int compare(Object o1, Object o2) {
77: TransparencySortGeom t1 = (TransparencySortGeom) o1;
78: TransparencySortGeom t2 = (TransparencySortGeom) o2;
79:
80: double f = t1.getDistanceSquared() - t2.getDistanceSquared();
81: if (f < 0)
82: return -1;
83: if (f == 0)
84: return 0;
85:
86: return 1;
87: }
88:
89: }
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