001: /*
002: * $RCSfile: OrderingComparator.java,v $
003: *
004: * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * - Redistribution of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * - Redistribution in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in
015: * the documentation and/or other materials provided with the
016: * distribution.
017: *
018: * Neither the name of Sun Microsystems, Inc. or the names of
019: * contributors may be used to endorse or promote products derived
020: * from this software without specific prior written permission.
021: *
022: * This software is provided "AS IS," without a warranty of any
023: * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
024: * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
025: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
026: * EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
027: * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
028: * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
029: * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
030: * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
031: * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
032: * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
033: * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
034: * POSSIBILITY OF SUCH DAMAGES.
035: *
036: * You acknowledge that this software is not designed, licensed or
037: * intended for use in the design, construction, operation or
038: * maintenance of any nuclear facility.
039: *
040: * $Revision: 1.2 $
041: * $Date: 2007/02/09 17:17:01 $
042: * $State: Exp $
043: */
044:
045: package org.jdesktop.j3d.utils.scenegraph.transparency;
046:
047: import com.sun.j3d.utils.scenegraph.transparency.TransparencySortGeom;
048: import java.util.Comparator;
049: import javax.media.j3d.Shape3D;
050: import javax.media.j3d.Transform3D;
051:
052: /**
053: * Comparator used to determine the rendering order of the transparent
054: * Shapes.
055: *
056: * This class will be instantiated and used by the system, the user application
057: * does not need to use this class directly.
058: */
059: public class OrderingComparator implements Comparator {
060:
061: private TransparencyOrderController controller;
062:
063: /** Creates a new instance of SimpleDistanceComparator */
064: public OrderingComparator() {
065: controller = TransparencyOrderController.getController();
066: }
067:
068: /**
069: * Compares its two arguments for order. Returns a negative integer, zero,
070: * or a positive integer as the first argument is less than (closer to the viewer),
071: * equal to, or greater than (further from the viewer) the second argument.
072: *
073: * The compare method will be called with 2 objects of type
074: * TransparencySortGeom and it's result should indicate which object is
075: * closer to the viewer. Object1 < Object2 if it is to be considered closer
076: * and rendered after.
077: *
078: * @param o1 TransparencySortGeom object 1
079: * @param o2 TransparencySortGeom object 2
080: *
081: */
082: public int compare(Object o1, Object o2) {
083: TransparencySortGeom t1 = (TransparencySortGeom) o1;
084: TransparencySortGeom t2 = (TransparencySortGeom) o2;
085:
086: Shape3D s1 = t1.getShape3D();
087: Shape3D s2 = t2.getShape3D();
088:
089: int ret = controller.compare(s1, s2);
090: if (ret != 0)
091: return ret;
092:
093: double f = t1.getDistanceSquared() - t2.getDistanceSquared();
094: if (f < 0)
095: return -1;
096: if (f == 0)
097: return 0;
098:
099: return 1;
100: }
101:
102: }
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