001: /*
002: * $RCSfile: SwitchPathInterpolator.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: 1.4 $
041: * $Date: 2007/02/09 17:20:09 $
042: * $State: Exp $
043: */
044:
045: package com.sun.j3d.loaders.lw3d;
046:
047: import javax.vecmath.*;
048: import java.util.BitSet;
049: import java.util.Enumeration;
050:
051: import javax.media.j3d.Alpha;
052: import javax.media.j3d.Node;
053: import javax.media.j3d.NodeReferenceTable;
054: import javax.media.j3d.SceneGraphObject;
055: import javax.media.j3d.Switch;
056: import com.sun.j3d.internal.J3dUtilsI18N;
057:
058: /**
059: * This class was used in conjunction with SequenceReader to create
060: * Tloop functionality inside of Lightwave files. This behavior handles
061: * the switching between objects defined in separate lines of a
062: * sequence file. That is, each line in a sequence file has the name
063: * of an object (or an object sequence, if the name ends in "000")
064: * and details the start and end frames that that object should be active.
065: * This class determines which object/s defined in the file should be active
066: * at any given time during the animation.
067: */
068:
069: class SwitchPathInterpolator extends FloatValueInterpolator {
070:
071: Switch target;
072: int firstSwitchIndex;
073: int lastSwitchIndex;
074: int currentChild;
075: int childCount;
076:
077: /**
078: * Constructs a new SwitchPathInterpolator object.
079: * @param alpha the alpha object for this interpolator
080: * @param knots an array of knot values that specify a spline
081: */
082: SwitchPathInterpolator(Alpha alpha, float knots[], Switch target) {
083:
084: super (alpha, knots, new float[knots.length]);
085:
086: if (knots.length != (target.numChildren() + 1))
087: throw new IllegalArgumentException(J3dUtilsI18N
088: .getString("SwitchPathInterpolator0"));
089:
090: this .target = target;
091: firstSwitchIndex = 0;
092: lastSwitchIndex = target.numChildren() - 1;
093: childCount = lastSwitchIndex + 1;
094: }
095:
096: /**
097: * This method sets the correct child for the Switch node according
098: * to alpha
099: * @param criteria enumeration of criteria that have triggered this wakeup
100: */
101:
102: public void processStimulus(Enumeration criteria) {
103:
104: int child;
105:
106: // Handle stimulus
107: if (this .getAlpha() != null) {
108:
109: // Let PathInterpolator calculate the correct
110: // interpolated knot point
111: computePathInterpolation();
112:
113: if (currentKnotIndex > 0)
114: child = currentKnotIndex - 1;
115: else
116: child = 0;
117:
118: if (target.getWhichChild() != child) {
119: target.setWhichChild(child);
120: }
121:
122: if ((this.getAlpha()).finished())
123: return;
124: }
125:
126: wakeupOn(defaultWakeupCriterion);
127: }
128:
129: }
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