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

   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 SoType getClassTypeId (void)
       static int getClassStackIndex (void)
       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

   Additional Inherited Members

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::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 *conststate, const intstackIndex, SoNode
       *constnode) [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()

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.

Author

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