javax.media.j3d
Class PositionPathInterpolator

java.lang.Object
  javax.media.j3d.SceneGraphObject
      javax.media.j3d.Node
          javax.media.j3d.Leaf
              javax.media.j3d.Behavior
                  javax.media.j3d.Interpolator
                      javax.media.j3d.TransformInterpolator
                          javax.media.j3d.PathInterpolator
                              javax.media.j3d.PositionPathInterpolator

public class PositionPathInterpolator
extends PathInterpolator

PositionPathInterpolator behavior. This class defines a behavior that modifies the translational component of its target TransformGroup by linearly interpolating among a series of predefined knot/position pairs (using the value generated by the specified Alpha object). The interpolated position is used to generate a translation transform in the local coordinate system of this interpolator. 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.

Field Summary

Fields inherited from class javax.media.j3d.Node

ALLOW_AUTO_COMPUTE_BOUNDS_READ, ALLOW_AUTO_COMPUTE_BOUNDS_WRITE, ALLOW_BOUNDS_READ, ALLOW_BOUNDS_WRITE, ALLOW_COLLIDABLE_READ, ALLOW_COLLIDABLE_WRITE, ALLOW_LOCAL_TO_VWORLD_READ, ALLOW_LOCALE_READ, ALLOW_PARENT_READ, ALLOW_PICKABLE_READ, ALLOW_PICKABLE_WRITE, ENABLE_COLLISION_REPORTING, ENABLE_PICK_REPORTING

Constructor Summary

PositionPathInterpolator(Alpha alpha, TransformGroup target, Transform3D axisOfTransform, float[] knots, javax.vecmath.Point3f[] positions)
Constructs a new PositionPathInterpolator that varies the transform of the target TransformGroup.

Method Summary

Node	cloneNode(boolean forceDuplicate) Used to create a new instance of the node.
void	computeTransform(float alphaValue, Transform3D transform) Computes the new transform for this interpolator for a given alpha value.
Transform3D	getAxisOfTranslation() Deprecated. As of Java 3D version 1.3, replaced by TransformInterpolator.getTransformAxis()
void	getPosition(int index, javax.vecmath.Point3f position) Retrieves the position value at the specified index.
void	getPositions(javax.vecmath.Point3f[] positions) Copies the array of position values from this interpolator into the specified array.
void	setAxisOfTranslation(Transform3D axisOfTranslation) Deprecated. As of Java 3D version 1.3, replaced by TransformInterpolator.setTransformAxis(Transform3D)
void	setPathArrays(float[] knots, javax.vecmath.Point3f[] positions) Replaces the existing arrays of knot values and position values with the specified arrays.
void	setPosition(int index, javax.vecmath.Point3f position) Sets the position at the specified index for this interpolator.

Methods inherited from class javax.media.j3d.PathInterpolator

getArrayLengths, getKnot, getKnots, setKnot

Methods inherited from class javax.media.j3d.TransformInterpolator

getTarget, getTransformAxis, processStimulus, setTarget, setTransformAxis, updateNodeReferences

Methods inherited from class javax.media.j3d.Interpolator

getAlpha, initialize, setAlpha

Methods inherited from class javax.media.j3d.Behavior

getEnable, getNumSchedulingIntervals, getSchedulingBoundingLeaf, getSchedulingBounds, getSchedulingInterval, postId, setEnable, setSchedulingBoundingLeaf, setSchedulingBounds, setSchedulingInterval

Methods inherited from class javax.media.j3d.Node

cloneTree, cloneTree, cloneTree, cloneTree, cloneTree, cloneTree, duplicateNode, getBounds, getBoundsAutoCompute, getCollidable, getLocale, getLocalToVworld, getLocalToVworld, getParent, getPickable, setBounds, setBoundsAutoCompute, setCollidable, setPickable

Methods inherited from class javax.media.j3d.SceneGraphObject

clearCapability, clearCapabilityIsFrequent, getCapability, getCapabilityIsFrequent, getName, getUserData, isCompiled, isLive, setCapability, setCapabilityIsFrequent, setName, setUserData, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PositionPathInterpolator

public PositionPathInterpolator(Alpha alpha,
                                TransformGroup target,
                                Transform3D axisOfTransform,
                                float[] knots,
                                javax.vecmath.Point3f[] positions)

Constructs a new PositionPathInterpolator that varies the transform of the target TransformGroup.

Parameters:

alpha - the alpha object for this interpolator

target - the TransformGroup node affected by this translator

axisOfTransform - the transform that defines the local coordinate system in which this interpolator operates

knots - an array of knot values that specify interpolation points.

positions - an array of position values at the knots.

Throws:

java.lang.IllegalArgumentException - if the lengths of the knots and positions arrays are not the same.

Method Detail

setPosition

public void setPosition(int index,
                        javax.vecmath.Point3f position)

Sets the position at the specified index for this interpolator.

Parameters:

index - the index of the position to be changed

position - the new position at the index

getPosition

public void getPosition(int index,
                        javax.vecmath.Point3f position)

Retrieves the position value at the specified index.

Parameters:

index - the index of the value requested

position - the variable to receive the position value at the specified index

setPathArrays

public void setPathArrays(float[] knots,
                          javax.vecmath.Point3f[] positions)

Replaces the existing arrays of knot values and position values with the specified arrays. The arrays of knots and positions are copied into this interpolator object.

Parameters:

knots - a new array of knot values that specify interpolation points

positions - a new array of position values at the knots

Throws:

java.lang.IllegalArgumentException - if the lengths of the knots and positions arrays are not the same.

Since:

Java 3D 1.2

getPositions

public void getPositions(javax.vecmath.Point3f[] positions)

Copies the array of position values from this interpolator into the specified array. The array must be large enough to hold all of the positions. The individual array elements must be allocated by the caller.

Parameters:

positions - array that will receive the positions

Since:

Java 3D 1.2

setAxisOfTranslation

public void setAxisOfTranslation(Transform3D axisOfTranslation)

Deprecated. As of Java 3D version 1.3, replaced by TransformInterpolator.setTransformAxis(Transform3D)

getAxisOfTranslation

public Transform3D getAxisOfTranslation()

Deprecated. As of Java 3D version 1.3, replaced by TransformInterpolator.getTransformAxis()

computeTransform

public void computeTransform(float alphaValue,
                             Transform3D transform)

Computes the new transform for this interpolator for a given alpha value.

Specified by:

computeTransform in class TransformInterpolator

Parameters:

alphaValue - alpha value between 0.0 and 1.0

transform - object that receives the computed transform for the specified alpha value

Since:

Java 3D 1.3

cloneNode

public Node cloneNode(boolean forceDuplicate)

Used to create a new instance of the node. This routine is called by cloneTree to duplicate the current node.

Overrides:

cloneNode in class Node

Parameters:

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 Also:

Node.cloneTree(), Node.cloneNode(boolean), Node.duplicateNode(javax.media.j3d.Node, boolean), NodeComponent.setDuplicateOnCloneTree(boolean)