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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
* NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
* USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
* ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or
* intended for use in the design, construction, operation or
* maintenance of any nuclear facility.
*
*/
package com.sun.j3d.loaders.lw3d;
import java.util.Enumeration;
import javax.media.j3d.Alpha;
import javax.media.j3d.Switch;
import com.sun.j3d.internal.J3dUtilsI18N;
/**
* This class was used in conjunction with SequenceReader to create
* Tloop functionality inside of Lightwave files. This behavior handles
* the switching between objects defined in separate lines of a
* sequence file. That is, each line in a sequence file has the name
* of an object (or an object sequence, if the name ends in "000")
* and details the start and end frames that that object should be active.
* This class determines which object/s defined in the file should be active
* at any given time during the animation.
*/
class SwitchPathInterpolator extends FloatValueInterpolator {
Switch target;
int firstSwitchIndex;
int lastSwitchIndex;
int currentChild;
int childCount;
/**
* Constructs a new SwitchPathInterpolator object.
* @param alpha the alpha object for this interpolator
* @param knots an array of knot values that specify a spline
*/
SwitchPathInterpolator(Alpha alpha, float knots[], Switch target) {
super(alpha, knots, new float[knots.length]);
if (knots.length != (target.numChildren() + 1))
throw new IllegalArgumentException(J3dUtilsI18N.getString("SwitchPathInterpolator0"));
this.target = target;
firstSwitchIndex = 0;
lastSwitchIndex = target.numChildren() - 1;
childCount = lastSwitchIndex + 1;
}
/**
* This method sets the correct child for the Switch node according
* to alpha
* @param criteria enumeration of criteria that have triggered this wakeup
*/
@Override
public void processStimulus(Enumeration criteria) {
int child;
// Handle stimulus
if (this.getAlpha() != null) {
// Let PathInterpolator calculate the correct
// interpolated knot point
computePathInterpolation();
if (currentKnotIndex > 0)
child = currentKnotIndex - 1;
else
child = 0;
if (target.getWhichChild() != child) {
target.setWhichChild(child);
}
if ((this.getAlpha()).finished())
return;
}
wakeupOn(defaultWakeupCriterion);
}
}