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SoGLPointSizeElement

NAME

SoGLPointSizeElement - The SoGLPointSizeElement class changes the pointsize setting of the OpenGL render state.

Requests from the scenegraph to change the pointsize when rendering point primitives will be made through this element, which forwards it to the appropriate native OpenGL call.

SYNOPSIS

#include <Inventor/elements/SoGLPointSizeElement.h>

Inherits SoPointSizeElement.

Public Member Functions

virtual void init (SoState *state)

virtual void push (SoState *state)

virtual void pop (SoState *state, const SoElement *prevTopElement)

Static Public Member Functions

static SoType getClassTypeId (void)

static int getClassStackIndex (void)

static void * createInstance (void)

static void initClass (void)

Protected Member Functions

virtual ~SoGLPointSizeElement ()

virtual void setElt (float size)

Detailed Description

The SoGLPointSizeElement class changes the pointsize setting of the OpenGL render state.

Requests from the scenegraph to change the pointsize when rendering point primitives will be made through this element, which forwards it to the appropriate native OpenGL call.

The Coin library does not place any bounds on the values of the pointsize, but be aware that the range and granularity of what is valid pointsizes depends on the underlying OpenGL implementation. Application programmers using point primitives (typically through the SoPointSet node) should heed these boundary values. They can be acquired by running the following code from within a valid OpenGL context:

     GLfloat bounds[2];
     glGetFloatv(GL_POINT_SIZE_RANGE, bounds);
     GLfloat granularity[1];
     glGetFloatv(GL_POINT_SIZE_GRANULARITY, granularity);
 

Another, perhaps more convenient, way of acquiring the OpenGL implementation limits with regard to pointsizes is to use the So*GLWidgetgetPointSizeLimits() method in the GUI 'glue' interface library you are using (SoQt, SoXt, SoGtk, SoWin, ...).

Constructor & Destructor Documentation

SoGLPointSizeElement::~SoGLPointSizeElement (void) [protected, virtual]

The destructor.

Member Function Documentation

SoType SoGLPointSizeElement::getClassTypeId (void) [static]

This static method returns the class type.

Reimplemented from SoPointSizeElement.

int SoGLPointSizeElement::getClassStackIndex (void) [static]

This static method returns the state stack index for the class.

Reimplemented from SoPointSizeElement.

void * SoGLPointSizeElement::createInstance (void) [static]

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

Reimplemented from SoPointSizeElement.

void SoGLPointSizeElement::initClass (void) [static]

Initialize relevant common data for all instances, like the type system.

Reimplemented from SoPointSizeElement.

void SoGLPointSizeElement::setElt (float val) [protected, virtual]

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

Reimplemented from SoFloatElement.

Author

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