class SG_EXPORT osg::NodeVisitor

Visitor for type safe operations on osg::Node's.

Inheritance:

Public Methods

NodeVisitor(TraversalMode tm=TRAVERSE_NONE)

virtual ~NodeVisitor()

virtual void reset()

Method to call to reset visitor.

inline void setTraversalNumber(const int fn)

Set the traversal number.

inline const int getTraversalNumber() const

Get the traversal number.

inline void setFrameStamp(FrameStamp* fs)

Set the FrameStamp that this traversal is assoicated with

inline const FrameStamp* getFrameStamp() const

Get the FrameStamp that this traversal is assoicated with

inline void setTraversalMask(const Node::NodeMask mask)

Set the TraversalMask of this NodeVisitor.

inline const Node::NodeMask getTraversalMask() const

Get the TraversalMask

inline void setNodeMaskOverride(const Node::NodeMask mask)

Set the NodeMaskOverride mask.

inline const Node::NodeMask getNodeMaskOverride() const

Get the NodeMaskOverride mask

inline const bool validNodeMask(const osg::Node& node) const

Method to called by Node and its subclass' Node::accept() method, if the result is true to be used to cull operations of nodes and their subgraphs.

void setTraversalMode(const TraversalMode mode)

Set the traversal mode for Node::traverse() to use when deciding which children of a node to traverse.

inline const TraversalMode getTraversalMode() const

Get the traversal mode

void setTraversalVisitor(NodeVisitor* nv)

Set a visitor to handle traversal.

NodeVisitor* getTraversalVisitor()

Get the traversal visitor, returns NULL if none is attached

void traverse(Node& node)

Inline method for handling traversal of a nodes.

virtual void apply(Node& node)

virtual void apply(Geode& node)

virtual void apply(Billboard& node)

virtual void apply(LightSource& node)

virtual void apply(Group& node)

virtual void apply(Transform& node)

virtual void apply(Switch& node)

virtual void apply(Sequence& node)

virtual void apply(LOD& node)

virtual void apply(Impostor& node)

virtual void apply(EarthSky& node)

Public Members

enum TraversalMode

Protected Fields

int _traversalNumber

ref_ptr<FrameStamp> _frameStamp

ref_ptr<NodeVisitor> _traversalVisitor

TraversalMode _traversalMode

Node::NodeMask _traversalMask

Node::NodeMask _nodeMaskOverride

Inherited from Referenced:

Public Methods

inline Referenced& operator = (Referenced&)

inline void ref() const

inline void unref() const

inline const int referenceCount() const

Protected Fields

mutable int _refCount

Documentation

Visitor for type safe operations on osg::Node's. Based on GOF's Visitor pattern. The NodeVisitor is useful for developing type safe operations to nodes in the scene graph (as per Visitor pattern), and adds to this support for optional scene graph traversal to allow operations to be applied to whole scenes at once. The Visitor pattern uses a technique of double dispatch as a mechanism to called the appropriate apply(..) method of the NodeVisitor. To use this feature one must use the Node::accept(NodeVisitor) which is extended in each Node subclass, rather than the NodeVisitor apply directly. So use root->accept(myVisitor); instead of myVisitor.apply(*root). The later method will bypass the double dispatch and the appropriate NodeVisitor::apply(..) method will not be called.

enum TraversalMode

TRAVERSE_NONE

TRAVERSE_PARENTS

TRAVERSE_ALL_CHILDREN

TRAVERSE_ACTIVE_CHILDREN

TRAVERSE_VISITOR

NodeVisitor(TraversalMode tm=TRAVERSE_NONE)

virtual ~NodeVisitor()

virtual void reset()

Method to call to reset visitor. Useful for your visitor accumulates state during a traversal, and you plan to reuse the visitor. To flush that state for the next traversal than call reset() prior to each traversal.

inline void setTraversalNumber(const int fn)

Set the traversal number. Typically used to denote the frame count.

inline const int getTraversalNumber() const

Get the traversal number. Typically used to denote the frame count.

inline void setFrameStamp(FrameStamp* fs)

Set the FrameStamp that this traversal is assoicated with

inline const FrameStamp* getFrameStamp() const

Get the FrameStamp that this traversal is assoicated with

inline void setTraversalMask(const Node::NodeMask mask)

Set the TraversalMask of this NodeVisitor. The TraversalMask is used by the NodeVisitor::validNodeMask() method to determine whether to operate on a node and its subgraph. validNodeMask() is called automaticaly in the Node::accept() method before any call to NodeVisitor::apply(), apply() is only ever called if validNodeMask returns true. Note, if NodeVisitor::_traversalMask is 0 then all operations will be swithced off for all nodes. Whereas setting both _traversalMask and _nodeMaskOverride to 0xffffffff will allow a visitor to work on all nodes regardless of their own Node::_nodeMask state.

inline const Node::NodeMask getTraversalMask() const

Get the TraversalMask

inline void setNodeMaskOverride(const Node::NodeMask mask)

Set the NodeMaskOverride mask. Used in validNodeMask() to determine whether to operate on a node or its subgraph, by OR'ing NodeVisitor::_nodeMaskOverride with the Node's own Node::_nodeMask. Typically used to force on nodes which may have been switched off by their own Node::_nodeMask.

inline const Node::NodeMask getNodeMaskOverride() const

Get the NodeMaskOverride mask

inline const bool validNodeMask(const osg::Node& node) const

Method to called by Node and its subclass' Node::accept() method, if the result is true to be used to cull operations of nodes and their subgraphs. Return true if the result of a bit wise and of the NodeVisitor::_traversalMask with the bit or between NodeVistor::_nodeMaskOverride and the Node::_nodeMask. default values for _traversalMask is 0xffffffff, _nodeMaskOverride is 0x0, and osg::Node::_nodeMask is 0xffffffff.

void setTraversalMode(const TraversalMode mode)

Set the traversal mode for Node::traverse() to use when deciding which children of a node to traverse. If a NodeVisitor has been attached via setTraverseVisitor() and the new mode is not TRAVERSE_VISITOR then the attached visitor is detached. Default mode is TRAVERSE_NONE.

inline const TraversalMode getTraversalMode() const

Get the traversal mode

void setTraversalVisitor(NodeVisitor* nv)

Set a visitor to handle traversal. Overrides the traverse mode setting it to TRAVERSAL_VISITOR.

NodeVisitor* getTraversalVisitor()

Get the traversal visitor, returns NULL if none is attached

void traverse(Node& node)

Inline method for handling traversal of a nodes. If you intend to use the visitor for actively traversing the scene graph then make sure the accept() methods call this method unless they handle traversal directly.

virtual void apply(Node& node)

virtual void apply(Geode& node)

virtual void apply(Billboard& node)

virtual void apply(LightSource& node)

virtual void apply(Group& node)

virtual void apply(Transform& node)

virtual void apply(Switch& node)

virtual void apply(Sequence& node)

virtual void apply(LOD& node)

virtual void apply(Impostor& node)

virtual void apply(EarthSky& node)

int _traversalNumber

ref_ptr<FrameStamp> _frameStamp

ref_ptr<NodeVisitor> _traversalVisitor

TraversalMode _traversalMode

Node::NodeMask _traversalMask

Node::NodeMask _nodeMaskOverride

This class has no child classes.

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