javax.media.j3d
Class Group

java.lang.Object
  |
  +--javax.media.j3d.SceneGraphObject
        |
        +--javax.media.j3d.Node
              |
              +--javax.media.j3d.Group

Direct Known Subclasses:

BranchGroup, OrderedGroup, Primitive, SharedGroup, Switch, TransformGroup, ViewSpecificGroup

public class Group

extends Node

The Group node object is a general-purpose grouping node. Group nodes have exactly one parent and an arbitrary number of children that are rendered in an unspecified order (or in parallel). Null children are allowed; no operation is performed on a null child node. Operations on Group node objects include adding, removing, and enumerating the children of the Group node. The subclasses of Group node add additional semantics.

Field Summary

static int	ALLOW_CHILDREN_EXTEND Specifies that this Group node allows adding new children.
static int	ALLOW_CHILDREN_READ Specifies that this Group node allows reading its children.
static int	ALLOW_CHILDREN_WRITE Specifies that this Group node allows writing its children.
static int	ALLOW_COLLISION_BOUNDS_READ Specifies that this Group node allows reading its collision Bounds
static int	ALLOW_COLLISION_BOUNDS_WRITE Specifies that this Group node allows writing its collision Bounds

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

Group()
Constructs a Group node with default parameters.

Method Summary

void	addChild(Node child) Appends the specified child node to this group node's list of children.
Node	cloneNode(boolean forceDuplicate) Used to create a new instance of the node.
java.util.Enumeration	getAllChildren() Returns an Enumeration object of this group node's list of children.
boolean	getAlternateCollisionTarget() Returns the collision target state.
Node	getChild(int index) Retrieves the child node at the specified index in this group node's list of children.
Bounds	getCollisionBounds() Returns the collision bounding object of this node.
int	indexOfChild(Node child) Retrieves the index of the specified child node in this group node's list of children.
void	insertChild(Node child, int index) Inserts the specified child node in this group node's list of children at the specified index.
void	moveTo(BranchGroup branchGroup) Moves the specified branch group node from its existing location to the end of this group node's list of children.
int	numChildren() Returns a count of this group node's children.
void	removeAllChildren() Removes all children from this Group node.
void	removeChild(int index) Removes the child node at the specified index from this group node's list of children.
void	removeChild(Node child) Removes the specified child node from this group node's list of children.
void	setAlternateCollisionTarget(boolean target) Causes this Group node to be reported as the collision target when collision is being used and this node or any of its children is in a collision.
void	setChild(Node child, int index) Replaces the child node at the specified index in this group node's list of children with the specified child.
void	setCollisionBounds(Bounds bounds) Sets the collision bounds of a node.

Methods inherited from class javax.media.j3d.Node

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, updateNodeReferences

Methods inherited from class java.lang.Object

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

Field Detail

ALLOW_CHILDREN_READ

public static final int ALLOW_CHILDREN_READ

Specifies that this Group node allows reading its children.

See Also:

Constant Field Values

ALLOW_CHILDREN_WRITE

public static final int ALLOW_CHILDREN_WRITE

Specifies that this Group node allows writing its children.

See Also:

Constant Field Values

ALLOW_CHILDREN_EXTEND

public static final int ALLOW_CHILDREN_EXTEND

Specifies that this Group node allows adding new children.

See Also:

Constant Field Values

ALLOW_COLLISION_BOUNDS_READ

public static final int ALLOW_COLLISION_BOUNDS_READ

Specifies that this Group node allows reading its collision Bounds

See Also:

Constant Field Values

ALLOW_COLLISION_BOUNDS_WRITE

public static final int ALLOW_COLLISION_BOUNDS_WRITE

Specifies that this Group node allows writing its collision Bounds

See Also:

Constant Field Values

Constructor Detail

Group

public Group()

Constructs a Group node with default parameters. The default values are as follows:

collision bounds : null
alternate collision target : false

Method Detail

setCollisionBounds

public void setCollisionBounds(Bounds bounds)

Sets the collision bounds of a node.

Parameters:

bounds - the collision bounding object for a node

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

getCollisionBounds

public Bounds getCollisionBounds()

Returns the collision bounding object of this node.

Returns:

the node's collision bounding object

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

setChild

public void setChild(Node child,
                     int index)

Replaces the child node at the specified index in this group node's list of children with the specified child.

Parameters:

child - the new child

index - which child to replace. The index must be a value greater than or equal to 0 and less than numChildren().

Throws:

CapabilityNotSetException - if the appropriate capability is not set and this group node is part of live or compiled scene graph

RestrictedAccessException - if this group node is part of live or compiled scene graph and the child node being set is not a BranchGroup node

MultipleParentException - if child has already been added as a child of another group node

java.lang.IndexOutOfBoundsException - if index is invalid

insertChild

public void insertChild(Node child,
                        int index)

Inserts the specified child node in this group node's list of children at the specified index.

Parameters:

child - the new child

index - at which location to insert. The index must be a value greater than or equal to 0 and less than or equal to numChildren().

Throws:

CapabilityNotSetException - if the appropriate capability is not set and this group node is part of live or compiled scene graph

RestrictedAccessException - if this group node is part of live or compiled scene graph and the child node being inserted is not a BranchGroup node

MultipleParentException - if child has already been added as a child of another group node.

java.lang.IndexOutOfBoundsException - if index is invalid.

removeChild

public void removeChild(int index)

Removes the child node at the specified index from this group node's list of children.

Parameters:

index - which child to remove. The index must be a value greater than or equal to 0 and less than numChildren().

Throws:

CapabilityNotSetException - if the appropriate capability is not set and this group node is part of live or compiled scene graph

RestrictedAccessException - if this group node is part of live or compiled scene graph and the child node being removed is not a BranchGroup node

java.lang.IndexOutOfBoundsException - if index is invalid.

getChild

public Node getChild(int index)

Retrieves the child node at the specified index in this group node's list of children.

Parameters:

index - which child to return.

Returns:

the children at location index. The index must be a value greater than or equal to 0 and less than numChildren().

Throws:

CapabilityNotSetException - if the appropriate capability is not set and this group node is part of live or compiled scene graph

java.lang.IndexOutOfBoundsException - if index is invalid.

getAllChildren

public java.util.Enumeration getAllChildren()

Returns an Enumeration object of this group node's list of children.

Returns:

an Enumeration object of all the children

Throws:

CapabilityNotSetException - if the appropriate capability is not set and this group node is part of live or compiled scene graph

addChild

public void addChild(Node child)

Appends the specified child node to this group node's list of children.

Parameters:

child - the child to add to this node's list of children

Throws:

CapabilityNotSetException - if the appropriate capability is not set and this group node is part of live or compiled scene graph

RestrictedAccessException - if this group node is part of live or compiled scene graph and the child node being added is not a BranchGroup node

MultipleParentException - if child has already been added as a child of another group node.

moveTo

public void moveTo(BranchGroup branchGroup)

Moves the specified branch group node from its existing location to the end of this group node's list of children.

Parameters:

branchGroup - the branch group node to move to this node's list of children

Throws:

CapabilityNotSetException - if the appropriate capability is not set and this group node is part of live or compiled scene graph

numChildren

public int numChildren()

Returns a count of this group node's children.

Returns:

the number of children descendant from this node.

Throws:

CapabilityNotSetException - if the appropriate capability is not set and this group node is part of live or compiled scene graph

indexOfChild

public int indexOfChild(Node child)

Retrieves the index of the specified child node in this group node's list of children.

Parameters:

child - the child node to be looked up.

Returns:

the index of the specified child node; returns -1 if the object is not in the list.

Throws:

CapabilityNotSetException - if the appropriate capability is not set and this group node is part of live or compiled scene graph

Since:

Java 3D 1.3

removeChild

public void removeChild(Node child)

Removes the specified child node from this group node's list of children. If the specified object is not in the list, the list is not modified.

Parameters:

child - the child node to be removed.

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

RestrictedAccessException - if this group node is part of live or compiled scene graph and the child node being removed is not a BranchGroup node

Since:

Java 3D 1.3

removeAllChildren

public void removeAllChildren()

Removes all children from this Group node.

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

RestrictedAccessException - if this group node is part of live or compiled scene graph and any of the children being removed are not BranchGroup nodes

Since:

Java 3D 1.3

setAlternateCollisionTarget

public void setAlternateCollisionTarget(boolean target)

Causes this Group node to be reported as the collision target when collision is being used and this node or any of its children is in a collision. The default value is false. For collision with USE_GEOMETRY set, the collision traverser will check the geometry of all the Group node's leaf descendants; for collision with USE_BOUNDS set, the collision traverser will only check the bounds at this Group node. In both cases, if there is a collision, this Group node will be reported as the colliding object in the SceneGraphPath. This reporting is done regardless of whether ENABLE_COLLISION_REPORTING is set for this group node (setting alternate collision target to true implies collision reporting).

Parameters:

target - Indicates whether this Group node can be the target of a collision.

See Also:

WakeupOnCollisionEntry, WakeupOnCollisionMovement, WakeupOnCollisionExit

getAlternateCollisionTarget

public boolean getAlternateCollisionTarget()

Returns the collision target state.

Returns:

Indicates whether this Group node can be the target of a collision.

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)