/*
* $RCSfile: J3DAxisBehavior.java,v $
*
* Copyright (c) 2005 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.
*
* $Revision: 1.1 $
* $Date: 2005/06/28 17:20:49 $
* $State: Exp $
*/
package com.sun.electric.plugins.Java3D;
import java.util.Enumeration;
import javax.media.j3d.*;
import javax.vecmath.*;
/**
* Behavior class to extract the rotation component of the view
* platform transform, and set the axis transform to the inverse of
* that rotation. The axis should be added as a child of the platform
* geometry. Note that this behavior must run after the view platform
* behavior.
*/
public class J3DAxisBehavior extends Behavior {
// J3DAxis transform group (target of behavior)
private TransformGroup axisTG;
// View platform transform group (source)
private TransformGroup viewPlatformTG;
// Wake up every frame (passively)
private WakeupOnElapsedFrames w = new WakeupOnElapsedFrames(0, true);
// Cached value of last view platform transform
private Transform3D lastTransform = new Transform3D();
// Temporary transform
private Transform3D t1 = new Transform3D();
// Temporary rotation matrix
private Matrix3d rotMat = new Matrix3d();
/**
* Constructs a new J3DAxisBehavior from the specified view
* platform transform group and axis transform group.
*/
public J3DAxisBehavior(TransformGroup axisTG, TransformGroup viewPlatformTG)
{
// Save references to source and target transform groups
this.axisTG = axisTG;
this.viewPlatformTG = viewPlatformTG;
// Run this behavior in the last scheduling interval
setSchedulingInterval(Behavior.getNumSchedulingIntervals() - 1);
}
/**
* Initialize local variables and set the initial wakeup
* condition. Called when the behavior is first made live.
*/
public void initialize()
{
// Initiialize to identity (no rotation)
lastTransform.setIdentity();
t1.setIdentity();
axisTG.setTransform(t1);
// Set the initial wakeup condition
wakeupOn(w);
}
/**
* Extract the rotation from the view platform transform (if it has
* changed) and update the target transform with its inverse.
*/
public void processStimulus(Enumeration criteria)
{
viewPlatformTG.getTransform(t1);
// Compute the new axis transform if the viewPlatformTransform
// has changed
if (!lastTransform.equals(t1)) {
lastTransform.set(t1);
t1.get(rotMat);
t1.setIdentity();
t1.set(rotMat);
t1.invert();
axisTG.setTransform(t1);
}
// Reset the wakeup condition so we will wakeup next frame
wakeupOn(w);
}
}