javax.media.j3d
Class ScaleInterpolator

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

public class ScaleInterpolator

extends Interpolator

Scale interpolation behavior. This class defines a behavior that modifies the uniform scale component of its target TransformGroup by linearly interpolating between a pair of specified scale values (using the value generated by the specified Alpha object). The interpolated scale value is used to generate a scale transform in the local coordinate system of this interpolator.

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_PICK, ALLOW_PICKABLE_READ, ALLOW_PICKABLE_WRITE, ENABLE_COLLISION_REPORTING, ENABLE_PICK_REPORTING

Constructor Summary

ScaleInterpolator(Alpha alpha, TransformGroup target)
Constructs a trivial scale interpolator that varies its target TransformGroup node between the two specified alpha values using the specified alpha, an identity matrix, a minimum scale = 0.1f, and a maximum scale = 1.0f.

ScaleInterpolator(Alpha alpha, TransformGroup target, Transform3D axisOfScale, float minimumScale, float maximumScale)
Constructs a new scaleInterpolator object that varies its target TransformGroup node's scale component between two scale values (minimumScale and maximumScale).

Method Summary

Node	cloneNode(boolean forceDuplicate) Used to create a new instance of the node.
void	duplicateNode(Node originalNode, boolean forceDuplicate) Copies all node information from originalNode into the current node.
Transform3D	getAxisOfScale() This method retrieves this interpolator's axis of scale transform.
float	getMaximumScale() This method retrieves this interpolator's maximumScale.
float	getMinimumScale() This method retrieves this interpolator's minimumScale.
TransformGroup	getTarget() This method retrieves this interpolator's target TransformGroup reference.
void	processStimulus(java.util.Enumeration criteria) This method is invoked by the behavior scheduler every frame.
void	setAxisOfScale(Transform3D axisOfScale) This method sets the axis of scale transform for this interpolator.
void	setMaximumScale(float scale) This method sets the maximumScale for this interpolator.
void	setMinimumScale(float scale) This method sets the minimumScale for this interpolator.
void	setTarget(TransformGroup target) This method sets the target TransformGroup 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, getSchedulingBoundingLeaf, getSchedulingBounds, getView, postId, setEnable, setSchedulingBoundingLeaf, setSchedulingBounds, wakeupOn

Methods inherited from class javax.media.j3d.Node

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

Methods inherited from class javax.media.j3d.SceneGraphObject

clearCapability, duplicateSceneGraphObject, getCapability, getUserData, isCompiled, isLive, setCapability, setUserData

Methods inherited from class java.lang.Object

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

Constructor Detail

ScaleInterpolator

public ScaleInterpolator(Alpha alpha,
                         TransformGroup target)

Constructs a trivial scale interpolator that varies its target TransformGroup node between the two specified alpha values using the specified alpha, an identity matrix, a minimum scale = 0.1f, and a maximum scale = 1.0f.

Parameters:

alpha - the alpha object for this interpolator

target - the TransformGroup node affected by this interpolator

ScaleInterpolator

public ScaleInterpolator(Alpha alpha,
                         TransformGroup target,
                         Transform3D axisOfScale,
                         float minimumScale,
                         float maximumScale)

Constructs a new scaleInterpolator object that varies its target TransformGroup node's scale component between two scale values (minimumScale and maximumScale).

Parameters:

alpha - the alpha object for this interpolator

target - the TransformGroup node affected by this interpolator

axisOfScale - the transform that defines the local coordinate system in which this interpolator operates; the scale is done about the origin of this local coordinate system.

minimumScale - the starting scale

maximumScale - the ending scale

Method Detail

setMinimumScale

public void setMinimumScale(float scale)

This method sets the minimumScale for this interpolator.

Parameters:

scale - The new minimal scale

getMinimumScale

public float getMinimumScale()

This method retrieves this interpolator's minimumScale.

Returns:

the interpolator's minimal scale value

setMaximumScale

public void setMaximumScale(float scale)

This method sets the maximumScale for this interpolator.

Parameters:

scale - the new maximum scale

getMaximumScale

public float getMaximumScale()

This method retrieves this interpolator's maximumScale.

Returns:

the interpolator's maximum scale vslue

setAxisOfScale

public void setAxisOfScale(Transform3D axisOfScale)

This method sets the axis of scale transform for this interpolator.

Parameters:

axisOfScale - defines the local coordinate system in which this interpolator operates

getAxisOfScale

public Transform3D getAxisOfScale()

This method retrieves this interpolator's axis of scale transform.

Returns:

the interpolator's axis of scale

setTarget

public void setTarget(TransformGroup target)

This method sets the target TransformGroup for this interpolator.

Parameters:

target - the target TransformGroup

getTarget

public TransformGroup getTarget()

This method retrieves this interpolator's target TransformGroup reference.

Returns:

the interpolator's target TransformGroup

processStimulus

public void processStimulus(java.util.Enumeration criteria)

This method is invoked by the behavior scheduler every frame. It maps the alpha value that corresponds to the current time into a scale value, computes a transform based on this value, and updates the specified TransformGroup node with this new transform.

Overrides:

processStimulus in class Behavior

Parameters:

criteria - an enumeration of the criteria that caused the stimulus

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)

duplicateNode

public void duplicateNode(Node originalNode,
                          boolean forceDuplicate)

Copies all node information from originalNode into the current node. This method is called from the cloneNode method which is, in turn, called by the cloneTree method.

For any NodeComponent objects contained by the object being duplicated, each NodeComponent object's duplicateOnCloneTree value is used to determine whether the NodeComponent should be duplicated in the new node or if just a reference to the current node should be placed in the new node. This flag can be overridden by setting the forceDuplicate parameter in the cloneTree method to true.

Overrides:

duplicateNode in class Interpolator

Parameters:

originalNode - the original node to duplicate.

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), NodeComponent.setDuplicateOnCloneTree(boolean)

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.

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