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The SoGLLineWidthElement class changes the linewidth setting of the OpenGL render state.Requests from the scenegraph to change the linewidth when rendering OpenGL line primitives will be made through this element, which forwards it to the appropriate native OpenGL call. More...
#include <Inventor/elements/SoGLLineWidthElement.h>
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 void | initClass (void) |
Protected Member Functions | |
virtual | ~SoGLLineWidthElement () |
virtual void | setElt (float width) |
The SoGLLineWidthElement class changes the linewidth setting of the OpenGL render state.
Requests from the scenegraph to change the linewidth when rendering OpenGL line 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 linewidths, but be aware that the range and granularity of what is valid linewidths depends on the underlying OpenGL implementation. Application programmers using line primitives (typically through the SoLineSet or SoIndexedLineSet nodes) 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_LINE_WIDTH_RANGE, bounds); GLfloat granularity[1]; glGetFloatv(GL_LINE_WIDTH_GRANULARITY, granularity);
Another, perhaps more convenient, way of acquiring the OpenGL implementation limits with regard to pointsizes is to use the So*GLWidget::getPointSizeLimits() method in the GUI "glue" interface library you are using (SoQt, SoXt, SoGtk, SoWin, ...).
SoGLLineWidthElement::~SoGLLineWidthElement | ( | void | ) | [protected, virtual] |
Destructor.
void SoGLLineWidthElement::initClass | ( | void | ) | [static] |
Initialize relevant common data for all instances, like the type system.
Reimplemented from SoLineWidthElement.
void SoGLLineWidthElement::setElt | ( | float | value | ) | [protected, virtual] |
Set element value.
Reimplemented from SoFloatElement.
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