javax.media.j3d
Class TransformInterpolator

java.lang.Object
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  +--javax.media.j3d.SceneGraphObject
        |
        +--javax.media.j3d.Node
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              +--javax.media.j3d.Leaf
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                    +--javax.media.j3d.Behavior
                          |
                          +--javax.media.j3d.Interpolator
                                |
                                +--javax.media.j3d.TransformInterpolator

Direct Known Subclasses:

KBSplinePathInterpolator, PathInterpolator, PositionInterpolator, RotationInterpolator, ScaleInterpolator, TCBSplinePathInterpolator

public abstract class TransformInterpolator

extends Interpolator

TransformInterpolator is an abstract class that extends Interpolator to provide common methods used by various transform related interpolator subclasses. These include methods to set/get the target of TransformGroup, and set/get transform of axis.

Since:

Java 3D 1.3

Field Summary

protected Transform3D	axis The transform that defines the local coordinate
protected Transform3D	axisInverse The inverse transform that defines the local coordinate
protected TransformGroup	target The TransformGroup node affected by this transformInterpolator

Fields inherited from class javax.media.j3d.Interpolator

defaultWakeupCriterion

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_PICKABLE_READ, ALLOW_PICKABLE_WRITE, ENABLE_COLLISION_REPORTING, ENABLE_PICK_REPORTING

Constructor Summary

TransformInterpolator()
Constructs a TransformInterpolator node with a null alpha value and a null target of TransformGroup

TransformInterpolator(Alpha alpha, TransformGroup target)
Constructs a trivial transform interpolator with a specified alpha, a specified target and an default axis set to Identity.

TransformInterpolator(Alpha alpha, TransformGroup target, Transform3D axisOfTransform)
Constructs a new transform interpolator that set an specified alpha, a specified targe and a specified axisOfTransform.

Method Summary

abstract void	computeTransform(float alphaValue, Transform3D transform) Computes the new transform for this interpolator for a given alpha value.
TransformGroup	getTarget() This method retrieves this interpolator's TransformGroup node reference.
Transform3D	getTransformAxis() This method retrieves this interpolator's axis of transform.
void	processStimulus(java.util.Enumeration criteria) This method is invoked by the behavior scheduler every frame.
void	setTarget(TransformGroup target) This method sets the target TransformGroup node for this interpolator.
void	setTransformAxis(Transform3D axisOfTransform) This method sets the axis of transform for this interpolator.
void	updateNodeReferences(NodeReferenceTable referenceTable) Callback used to allow a node to check if any scene graph objects referenced by that node have been duplicated via a call to cloneTree.

Methods inherited from class javax.media.j3d.Interpolator

getAlpha, initialize, setAlpha

Methods inherited from class javax.media.j3d.Behavior

getEnable, getNumSchedulingIntervals, getSchedulingBoundingLeaf, getSchedulingBounds, getSchedulingInterval, getView, getWakeupCondition, postId, setEnable, setSchedulingBoundingLeaf, setSchedulingBounds, setSchedulingInterval, wakeupOn

Methods inherited from class javax.media.j3d.Node

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

Methods inherited from class javax.media.j3d.SceneGraphObject

clearCapability, clearCapabilityIsFrequent, duplicateSceneGraphObject, getCapability, getCapabilityIsFrequent, getUserData, isCompiled, isLive, setCapability, setCapabilityIsFrequent, setUserData

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

target

protected TransformGroup target

The TransformGroup node affected by this transformInterpolator

axis

protected Transform3D axis

The transform that defines the local coordinate

axisInverse

protected Transform3D axisInverse

The inverse transform that defines the local coordinate

Constructor Detail

TransformInterpolator

public TransformInterpolator()

Constructs a TransformInterpolator node with a null alpha value and a null target of TransformGroup

TransformInterpolator

public TransformInterpolator(Alpha alpha,
                             TransformGroup target)

Constructs a trivial transform interpolator with a specified alpha, a specified target and an default axis set to Identity.

Parameters:

alpha - The alpha object for this transform Interpolator

target - The target TransformGroup for this TransformInterpolator

TransformInterpolator

public TransformInterpolator(Alpha alpha,
                             TransformGroup target,
                             Transform3D axisOfTransform)

Constructs a new transform interpolator that set an specified alpha, a specified targe and a specified axisOfTransform.

Parameters:

alpha - the alpha object for this interpolator

target - the transformGroup node affected by this transformInterpolator

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

Method Detail

setTarget

public void setTarget(TransformGroup target)

This method sets the target TransformGroup node for this interpolator.

Parameters:

target - The target TransformGroup

getTarget

public TransformGroup getTarget()

This method retrieves this interpolator's TransformGroup node reference.

Returns:

the Interpolator's target TransformGroup

setTransformAxis

public void setTransformAxis(Transform3D axisOfTransform)

This method sets the axis of transform for this interpolator.

Parameters:

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

getTransformAxis

public Transform3D getTransformAxis()

This method retrieves this interpolator's axis of transform.

Returns:

the interpolator's axis of transform

computeTransform

public abstract void computeTransform(float alphaValue,
                                      Transform3D transform)

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

Parameters:

alphaValue - alpha value between 0.0 and 1.0

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

processStimulus

public void processStimulus(java.util.Enumeration criteria)

This method is invoked by the behavior scheduler every frame. First it gets the alpha value that corresponds to the current time. Then it calls computeTransform() method to computes the transform based on this alpha vaule, and updates the specified TransformGroup node with this new transform.

Specified by:

processStimulus in class Behavior

Parameters:

criteria - an enumeration of the criteria that caused the stimulus

updateNodeReferences

public void updateNodeReferences(NodeReferenceTable referenceTable)

Callback used to allow a node to check if any scene graph objects referenced by that node have been duplicated via a call to cloneTree. This method is called by cloneTree after all nodes in the sub-graph have been duplicated. The cloned Leaf node's method will be called and the Leaf node can then look up any object references by using the getNewObjectReference method found in the NodeReferenceTable object. If a match is found, a reference to the corresponding object in the newly cloned sub-graph is returned. If no corresponding reference is found, either a DanglingReferenceException is thrown or a reference to the original object is returned depending on the value of the allowDanglingReferences parameter passed in the cloneTree call.

NOTE: Applications should not call this method directly. It should only be called by the cloneTree method.

Overrides:

updateNodeReferences in class Behavior

Parameters:

referenceTable - a NodeReferenceTableObject that contains the getNewObjectReference method needed to search for new object instances.

See Also:

NodeReferenceTable, Node.cloneTree(), DanglingReferenceException