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/*
* Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
package javax.media.j3d;
import javax.vecmath.Quat4f;
/**
* RotationPathInterpolator behavior. This class defines a behavior
* that varies the rotational component of its target TransformGroup
* by linearly interpolating among a series of predefined knot/orientation
* pairs (using the value generated by the specified Alpha object). The
* interpolated orientation is used to generate a rotation transform in
* the local coordinate system. The first knot must have a value of 0.0.
* The last knot must have a value
* of 1.0. An intermediate knot with index k must have a value strictly
* greater than any knot with index less than k.
*/
public class RotationPathInterpolator extends PathInterpolator {
private Transform3D rotation = new Transform3D();
private Quat4f tQuat = new Quat4f();
// Array of quaternions at each knot
private Quat4f quats[];
private float prevInterpolationValue = Float.NaN;
// We can't use a boolean flag since it is possible
// that after alpha change, this procedure only run
// once at alpha.finish(). So the best way is to
// detect alpha value change.
private float prevAlphaValue = Float.NaN;
private WakeupCriterion passiveWakeupCriterion = new WakeupOnElapsedFrames(0, true);
// non-public, default constructor used by cloneNode
RotationPathInterpolator() {
}
/**
* Constructs a new RotationPathInterpolator object that varies the
* target TransformGroup node's transform.
* @param alpha the alpha object of this interpolator
* @param target the TransformGroup node affected by this interpolator
* @param axisOfTransform the transform that defines the local coordinate
* system in which this interpolator operates
* @param knots an array of knot values that specify interpolation points
* @param quats an array of quaternion values at the knots
* @exception IllegalArgumentException if the lengths of the
* knots and quats arrays are not the same.
*/
public RotationPathInterpolator(Alpha alpha,
TransformGroup target,
Transform3D axisOfTransform,
float[] knots,
Quat4f[] quats) {
super(alpha,target, axisOfTransform, knots);
if (knots.length != quats.length)
throw new IllegalArgumentException(J3dI18N.getString("RotationPathInterpolator0"));
setPathArrays(quats);
}
/**
* Sets the quat value at the specified index for this
* interpolator.
* @param index the index to be changed
* @param quat the new quat value at the index
*/
public void setQuat(int index, Quat4f quat) {
this.quats[index].set(quat);
}
/**
* Retrieves the quat value at the specified index.
* @param index the index of the value requested
* @param quat the quat object that will have the
* quat value at index copied into it.
*/
public void getQuat(int index, Quat4f quat) {
quat.set(this.quats[index]);
}
/**
* Replaces the existing arrays of knot values and quaternion
* values with the specified arrays.
* The arrays of knots and quats are copied
* into this interpolator object.
* @param knots a new array of knot values that specify
* interpolation points
* @param quats a new array of quaternion values at the knots
* @exception IllegalArgumentException if the lengths of the
* knots and quats arrays are not the same.
*
* @since Java 3D 1.2
*/
public void setPathArrays(float[] knots,
Quat4f[] quats) {
if (knots.length != quats.length)
throw new IllegalArgumentException(J3dI18N.getString("RotationPathInterpolator0"));
setKnots(knots);
setPathArrays(quats);
}
// Set the specific arrays for this path interpolator
private void setPathArrays(Quat4f[] quats) {
this.quats = new Quat4f[quats.length];
for(int i = 0; i < quats.length; i++) {
this.quats[i] = new Quat4f();
this.quats[i].set(quats[i]);
}
}
/**
* Copies the array of quaternion values from this interpolator
* into the specified array.
* The array must be large enough to hold all of the quats.
* The individual array elements must be allocated by the caller.
* @param quats array that will receive the quats
*
* @since Java 3D 1.2
*/
public void getQuats(Quat4f[] quats) {
for (int i = 0; i < this.quats.length; i++) {
quats[i].set(this.quats[i]);
}
}
/**
* @deprecated As of Java 3D version 1.3, replaced by
* TransformInterpolator.seTransformAxis(Transform3D)
*/
public void setAxisOfRotation(Transform3D axisOfRotation) {
setTransformAxis(axisOfRotation);
}
/**
* @deprecated As of Java 3D version 1.3, replaced by
* TransformInterpolator.getTransformAxis()
*/
public Transform3D getAxisOfRotation() {
return getTransformAxis();
}
// The RotationPathInterpolator's initialize routine uses the default
// initialization routine.
/**
* Computes the new transform for this interpolator for a given
* alpha value.
*
* @param alphaValue alpha value between 0.0 and 1.0
* @param transform object that receives the computed transform for
* the specified alpha value
*
* @since Java 3D 1.3
*/
@Override
public void computeTransform(float alphaValue, Transform3D transform) {
float tt;
double quatDot;
computePathInterpolation(alphaValue);
// For RPATH, take quaternion average and set rotation in TransformGroup
if (currentKnotIndex == 0 &&
currentInterpolationValue == 0f) {
tQuat.x = quats[0].x;
tQuat.y = quats[0].y;
tQuat.z = quats[0].z;
tQuat.w = quats[0].w;
} else {
quatDot = quats[currentKnotIndex].x *
quats[currentKnotIndex+1].x +
quats[currentKnotIndex].y *
quats[currentKnotIndex+1].y +
quats[currentKnotIndex].z *
quats[currentKnotIndex+1].z +
quats[currentKnotIndex].w *
quats[currentKnotIndex+1].w;
if (quatDot < 0) {
tQuat.x = quats[currentKnotIndex].x +
(-quats[currentKnotIndex+1].x -
quats[currentKnotIndex].x)*currentInterpolationValue;
tQuat.y = quats[currentKnotIndex].y +
(-quats[currentKnotIndex+1].y -
quats[currentKnotIndex].y)*currentInterpolationValue;
tQuat.z = quats[currentKnotIndex].z +
(-quats[currentKnotIndex+1].z -
quats[currentKnotIndex].z)*currentInterpolationValue;
tQuat.w = quats[currentKnotIndex].w +
(-quats[currentKnotIndex+1].w -
quats[currentKnotIndex].w)*currentInterpolationValue;
} else {
tQuat.x = quats[currentKnotIndex].x +
(quats[currentKnotIndex+1].x -
quats[currentKnotIndex].x)*currentInterpolationValue;
tQuat.y = quats[currentKnotIndex].y +
(quats[currentKnotIndex+1].y -
quats[currentKnotIndex].y)*currentInterpolationValue;
tQuat.z = quats[currentKnotIndex].z +
(quats[currentKnotIndex+1].z -
quats[currentKnotIndex].z)*currentInterpolationValue;
tQuat.w = quats[currentKnotIndex].w +
(quats[currentKnotIndex+1].w -
quats[currentKnotIndex].w)*currentInterpolationValue;
}
}
tQuat.normalize();
rotation.set(tQuat);
// construct a Transform3D from: axis * rotation * axisInverse
transform.mul(axis, rotation);
transform.mul(transform, axisInverse);
}
/**
* Used to create a new instance of the node. This routine is called
* by cloneTree to duplicate the current node.
* @param forceDuplicate when set to true, causes the
* duplicateOnCloneTree flag to be ignored. When
* false, the value of each node's
* duplicateOnCloneTree variable determines whether
* NodeComponent data is duplicated or copied.
*
* @see Node#cloneTree
* @see Node#cloneNode
* @see Node#duplicateNode
* @see NodeComponent#setDuplicateOnCloneTree
*/
@Override
public Node cloneNode(boolean forceDuplicate) {
RotationPathInterpolator rpi = new RotationPathInterpolator();
rpi.duplicateNode(this, forceDuplicate);
return rpi;
}
/**
* Copies all RotationPathInterpolator information from
* originalNode into
* the current node. This method is called from the
* cloneNode method which is, in turn, called by the
* cloneTree method.
*
* @param originalNode the original node to duplicate.
* @param forceDuplicate when set to true, causes the
* duplicateOnCloneTree flag to be ignored. When
* false, the value of each node's
* duplicateOnCloneTree variable determines whether
* NodeComponent data is duplicated or copied.
*
* @exception RestrictedAccessException if this object is part of a live
* or compiled scenegraph.
*
* @see Node#duplicateNode
* @see Node#cloneTree
* @see NodeComponent#setDuplicateOnCloneTree
*/
@Override
void duplicateAttributes(Node originalNode, boolean forceDuplicate) {
super.duplicateAttributes(originalNode, forceDuplicate);
RotationPathInterpolator ri =
(RotationPathInterpolator) originalNode;
int len = ri.getArrayLengths();
// No API available to change size of array, so set here explicitly
quats = new Quat4f[len];
Quat4f quat = new Quat4f();
for (int i = 0; i < len; i++) {
quats[i] = new Quat4f();
ri.getQuat(i, quat);
setQuat(i, quat);
}
}
}