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SoReplacedElement.3coin2

NAME

SoReplacedElement -

The SoReplacedElement class is an abstract element superclass.

This is the superclass of all elements where the new element data replaces the old data, and where the data the element stores is not just a simple float or integer value.

SYNOPSIS

#include <Inventor/elements/SoReplacedElement.h>

Inherits SoElement.

Inherited by SoGLColorIndexElement, SoListenerDopplerElement, SoListenerOrientationElement, and SoListenerPositionElement.

Public Member Functions

virtual void init (SoState *state)

virtual SbBool matches (const SoElement *element) const

virtual SoElement * copyMatchInfo () const

uint32_t getNodeId () const

virtual void print (FILE *file) const

Static Public Member Functions

static void initClass (void)

Protected Member Functions

virtual ~SoReplacedElement ()

Static Protected Member Functions

static SoElement * getElement (SoState *const state, const int stackIndex, SoNode *const node)

Protected Attributes

uint32_t nodeId

Detailed Description

The SoReplacedElement class is an abstract element superclass.

This is the superclass of all elements where the new element data replaces the old data, and where the data the element stores is not just a simple float or integer value.

Apart from this conceptual difference from its superclass, the SoReplacedElement class also overloads the default getElement() method to include a node reference. This reference is used to fetch the unique node identification number of the node that last changed the element.

The identifier values of nodes in the scenegraph is updated upon any kind of change to a node, so this technique plays an important role in the construction, validation and destruction of internal scenegraph caches.

See also:

SoAccumulatedElement

Constructor & Destructor Documentation

SoReplacedElement::~SoReplacedElement (void) [protected, virtual]Destructor.

Member Function Documentation

void SoReplacedElement::initClass (void) [static]Initialize relevant common data for all instances, like the type system.

Reimplemented from SoElement.

Reimplemented in SoGLColorIndexElement, SoListenerPositionElement, SoListenerOrientationElement, and SoListenerDopplerElement.

void SoReplacedElement::init (SoState * state) [virtual]This function initializes the element type in the given SoState. It is called for the first element of each enabled element type in SoState objects.

Reimplemented from SoElement.

Reimplemented in SoGLColorIndexElement, SoListenerPositionElement, SoListenerOrientationElement, and SoListenerDopplerElement.

References SoElement::init(), and nodeId.

Referenced by SoListenerPositionElement::init(), SoListenerOrientationElement::init(), and SoListenerDopplerElement::init().

SoElement * SoReplacedElement::copyMatchInfo (void) const [virtual]This function creates a copy of the element that contains enough information to enable the matches() function to work.

Used to help with scenegraph traversal caching operations.

Implements SoElement.

References SoType::createInstance(), SoElement::getTypeId(), and nodeId.

uint32_t SoReplacedElement::getNodeId (void) constReturns the node identifier for the node that previously updated the SoReplacedElement.

References nodeId.

void SoReplacedElement::print (FILE * file) const [virtual]This function is for printing element information, and is used mostly for debugging purposes.

Reimplemented from SoElement.

Reimplemented in SoListenerPositionElement, SoListenerOrientationElement, and SoListenerDopplerElement.

References SoType::getName(), SbName::getString(), and SoElement::getTypeId().

SoElement * SoReplacedElement::getElement (SoState *const state, const int stackIndex, SoNode *const node) [static, protected]This function overloads SoElement::getElement() with an extra node parameter, to let us set the SoReplacedElement::nodeId in the element instance before returning.

SoReplacedElement subclasses should use this method to get writable instances.

The identifier values of nodes in the scenegraph is updated upon any kind of change to a node, so this technique plays an important role in the construction, validation and destruction of internal scenegraph caches.

See also:

SoElement::getElement()

References SoElement::getElement(), SoNode::getNodeId(), and nodeId.

Member Data Documentation

uint32_t SoReplacedElement::nodeId [protected]This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Referenced by copyMatchInfo(), getElement(), getNodeId(), and init().

Author

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