SoReplacedElement Class Reference

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. More...

#include <Inventor/elements/SoReplacedElement.h>

Inheritance diagram for SoReplacedElement:

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
Public Member Functions inherited from SoElement
const SoType	getTypeId (void) const
int	getStackIndex (void) const
virtual void	push (SoState *state)
virtual void	pop (SoState *state, const SoElement *prevTopElement)
void	setDepth (const int depth)
int	getDepth (void) const
virtual	~SoElement ()

Static Public Member Functions
static SoType	getClassTypeId (void)
static int	getClassStackIndex (void)
static void	initClass (void)
Static Public Member Functions inherited from SoElement
static void	initClass (void)
static SoType	getClassTypeId (void)
static int	getClassStackIndex (void)
static void	initElements (void)
static int	getNumStackIndices (void)
static SoType	getIdFromStackIndex (const int stackIndex)

Protected Member Functions
virtual	~SoReplacedElement ()
Protected Member Functions inherited from SoElement
	SoElement (void)
void	capture (SoState *const state) const
virtual void	captureThis (SoState *state) const
void	setTypeId (const SoType typeId)
void	setStackIndex (const int index)
SoElement *	getNextInStack (void) const
SoElement *	getNextFree (void) const

Static Protected Member Functions
static SoElement *	getElement (SoState *const state, const int stackIndex, SoNode *const node)
Static Protected Member Functions inherited from SoElement
static SoElement *	getElement (SoState *const state, const int stackIndex)
static const SoElement *	getConstElement (SoState *const state, const int stackIndex)
static int	createStackIndex (const SoType id)

Protected Attributes
uint32_t	nodeId
Protected Attributes inherited from SoElement
SoType	typeId
int	stackIndex
int	depth

Additional Inherited Members
Static Protected Attributes inherited from SoElement
static int	classStackIndex
static SoTypeList *	stackToType

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  )

protectedvirtual

Destructor.

Member Function Documentation

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 SoEnvironmentElement, SoProfileCoordinateElement, SoPolygonOffsetElement, SoGeoElement, SoDiffuseColorElement, SoAmbientColorElement, SoCoordinateElement, SoEmissiveColorElement, SoGLColorIndexElement, SoNormalElement, SoSpecularColorElement, SoBumpMapCoordinateElement, SoFontNameElement, SoLightAttenuationElement, SoListenerDopplerElement, SoListenerOrientationElement, SoListenerPositionElement, SoTransparencyElement, SoViewingMatrixElement, SoViewVolumeElement, SoGLEnvironmentElement, SoGLNormalElement, SoGLPolygonOffsetElement, SoGLViewingMatrixElement, SoShininessElement, and SoSoundElement.

SbBool SoReplacedElement::matches ( const SoElement *  element ) const

virtual

This function returns TRUE is the element matches another element (of the same class), with respect to cache validity.

If the application programmer's extension element has a matches() function, it should also have a copyMatchInfo() function.

Implements SoElement.

Reimplemented in SoFontNameElement, and SoLightAttenuationElement.

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.

Reimplemented in SoFontNameElement, and SoLightAttenuationElement.

uint32_t SoReplacedElement::getNodeId

(

void

)

const

Returns the node identifier for the node that previously updated the SoReplacedElement.

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 SoEnvironmentElement, SoSoundElement, SoCoordinateElement, SoFontNameElement, SoLightAttenuationElement, SoListenerDopplerElement, SoListenerOrientationElement, and SoListenerPositionElement.

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

staticprotected

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()

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.

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The documentation for this class was generated from the following files:

• SoReplacedElement.h
• SoReplacedElement.cpp