SoColorIndex(3) The SoColorIndex class is used to specify color indices for subsequent shapes.

SYNOPSIS


#include <Inventor/nodes/SoColorIndex.h>

Inherits SoNode.

Public Member Functions


virtual SoType getTypeId (void) const

SoColorIndex (void)

virtual void GLRender (SoGLRenderAction *action)

Static Public Member Functions


static SoType getClassTypeId (void)

static void initClass (void)

Public Attributes


SoMFInt32 index

Protected Member Functions


virtual const SoFieldData * getFieldData (void) const

virtual ~SoColorIndex ()

Static Protected Member Functions


static const SoFieldData ** getFieldDataPtr (void)

Additional Inherited Members

Detailed Description

The SoColorIndex class is used to specify color indices for subsequent shapes.

This node should only be used in OpenGL color-index mode, and only when the current light model is set to SoLightModel::BASE_COLOR.

OpenGL colorindex mode is where the colors for individual pixels are fetched from a color lookup table ('CLUT'). The usual thing to do is to set up a canvas in RGBA truecolor mode.

One common use for colorindex mode OpenGL canvases is to use one in the overlay planes (which are usually limited to only 2 or 4 available colors), if supported by the OpenGL hardware and / or driver.

FILE FORMAT/DEFAULTS: 

    ColorIndex {
        index 1
    }


 

Constructor & Destructor Documentation

SoColorIndex::SoColorIndex (void)

Constructor.

SoColorIndex::~SoColorIndex () [protected], [virtual]

Destructor.

Member Function Documentation

SoType SoColorIndex::getClassTypeId (void) [static]

This static method returns the SoType object associated with objects of this class.

Reimplemented from SoNode.

SoType SoColorIndex::getTypeId (void) const [virtual]

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting.

Usage example: 

  void foo(SoNode * node)
  {
    if (node->getTypeId() == SoFile::getClassTypeId()) {
      SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type
    }
  }

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Implements SoBase.

const SoFieldData ** SoColorIndex::getFieldDataPtr (void) [static], [protected]

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Reimplemented from SoNode.

const SoFieldData * SoColorIndex::getFieldData (void) const [protected], [virtual]

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoFieldContainer.

void SoColorIndex::initClass (void) [static]

Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

Reimplemented from SoNode.

void SoColorIndex::GLRender (SoGLRenderAction *action) [virtual]

Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method.

Reimplemented from SoNode.

Member Data Documentation

SoMFInt32 SoColorIndex::index

Color indices which can be used by shapes.

Author

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