The SoQtRenderArea class adds scene graph handling and event management. More...

#include <Inventor/Qt/SoQtRenderArea.h>

Inheritance diagram for SoQtRenderArea:

Public Member Functions
	SoQtRenderArea (QWidget parent=NULL, const char name=NULL, SbBool embed=TRUE, SbBool mouseInput=TRUE, SbBool keyboardInput=TRUE)

	~SoQtRenderArea ()

void	getAntialiasing (SbBool &smoothing, int &numPasses) const

const SbColor &	getBackgroundColor (void) const

int	getBackgroundIndex (void) const

SoGLRenderAction *	getGLRenderAction (void) const

int	getOverlayBackgroundIndex (void) const

SoGLRenderAction *	getOverlayGLRenderAction (void) const

SoNode *	getOverlaySceneGraph (void)

SoSceneManager *	getOverlaySceneManager (void) const

uint32_t	getRedrawPriority (void) const

virtual SoNode *	getSceneGraph (void)

SoSceneManager *	getSceneManager (void) const

SoGLRenderAction::TransparencyType	getTransparencyType (void) const

const SbViewportRegion &	getViewportRegion (void) const

SbBool	isAutoRedraw (void) const

SbBool	isClearBeforeOverlayRender (void) const

SbBool	isClearBeforeRender (void) const

SbBool	isClearZBufferBeforeRender (void) const

void	redrawOnSelectionChange (SoSelection *selection)

void	redrawOverlayOnSelectionChange (SoSelection *selection)

void	registerDevice (SoQtDevice *device)

void	render (void)

void	renderOverlay (void)

void	scheduleOverlayRedraw (void)

void	scheduleRedraw (void)

SbBool	sendSoEvent (const SoEvent *event)

void	setAntialiasing (SbBool smoothing, int numPasses)

void	setAutoRedraw (SbBool enable)

void	setBackgroundColor (const SbColor &color)

void	setBackgroundIndex (int idx)

void	setClearBeforeOverlayRender (SbBool enable)

void	setClearBeforeRender (SbBool enable, SbBool zbEnable=TRUE)

void	setColorMap (int start, int num, const SbColor *colors)

void	setEventCallback (SoQtRenderAreaEventCB func, void user=NULL)

void	setGLRenderAction (SoGLRenderAction *action)

void	setOverlayBackgroundIndex (int idx)

void	setOverlayColorMap (int start, int num, const SbColor *colors)

void	setOverlayGLRenderAction (SoGLRenderAction *action)

void	setOverlaySceneGraph (SoNode *scene)

void	setOverlaySceneManager (SoSceneManager *manager)

void	setRedrawPriority (uint32_t priority)

virtual void	setSceneGraph (SoNode *scene)

void	setSceneManager (SoSceneManager *manager)

void	setTransparencyType (SoGLRenderAction::TransparencyType type)

void	setViewportRegion (const SbViewportRegion &newRegion)

void	unregisterDevice (SoQtDevice *device)

Public Member Functions inherited from SoQtGLWidget
SbBool	getAccumulationBuffer (void) const

SbBool	getAlphaChannel (void) const

QWidget *	getGLWidget (void) const

void	getLineWidthLimits (SbVec2f &range, float &granularity)

QWidget *	getNormalWidget (void) const

unsigned long	getOverlayTransparentPixel (void)

QWidget *	getOverlayWidget (void) const

void	getPointSizeLimits (SbVec2f &range, float &granularity)

int	getSampleBuffers (void) const

SbBool	getStencilBuffer (void) const

SbBool	hasNormalGLArea (void) const

SbBool	hasOverlayGLArea (void) const

SbBool	isBorder (void) const

SbBool	isDoubleBuffer (void) const

SbBool	isDrawToFrontBufferEnable (void) const

SbBool	isOverlayRender (void) const

SbBool	isQuadBufferStereo (void) const

SbBool	isStealFocus (void) const

void	setAccumulationBuffer (const SbBool enable)

void	setAlphaChannel (const SbBool enable)

void	setBorder (const SbBool enable)

virtual void	setDoubleBuffer (const SbBool enable)

void	setDrawToFrontBufferEnable (const SbBool enable)

void	setOverlayRender (const SbBool onoff)

void	setQuadBufferStereo (const SbBool enable)

void	setSampleBuffers (const int numsamples)

void	setStealFocus (SbBool enable)

void	setStencilBuffer (const SbBool enable)

Public Member Functions inherited from SoQtComponent
virtual	~SoQtComponent ()

QWidget *	getBaseWidget (void) const

const char *	getClassName (void) const

const char *	getIconTitle (void) const

QWidget *	getParentWidget (void) const

QWidget *	getShellWidget (void) const

SbVec2s	getSize (void) const

const char *	getTitle (void) const

QWidget *	getWidget (void) const

const char *	getWidgetName (void) const

virtual void	hide (void)

SbBool	isFullScreen (void) const

SbBool	isTopLevelShell (void) const

SbBool	isVisible (void)

virtual void	setComponentCursor (const SoQtCursor &cursor)

SbBool	setFullScreen (const SbBool onoff)

void	setIconTitle (const char *const title)

void	setSize (const SbVec2s size)

void	setTitle (const char *const title)

void	setWindowCloseCallback (SoQtComponentCB const func, void const user=NULL)

virtual void	show (void)

Public Member Functions inherited from SoQtObject
virtual SoType	getTypeId (void) const =0

SbBool	isOfType (SoType type) const

Static Public Member Functions
static uint32_t	getDefaultRedrawPriority (void)

Static Public Member Functions inherited from SoQtComponent
static SoQtComponent *	getComponent (QWidget *widget)

static void	initClasses (void)

static void	setWidgetCursor (QWidget *w, const SoQtCursor &cursor)

Static Public Member Functions inherited from SoQtObject
static SoType	getClassTypeId (void)

static void	init (void)

static void	initClass (void)

Protected Member Functions
	SoQtRenderArea (QWidget parent, const char name, SbBool embed, SbBool mouseInput, SbBool keyboardInput, SbBool build)

virtual void	actualOverlayRedraw (void)

virtual void	actualRedraw (void)

virtual void	afterRealizeHook (void)

QWidget *	buildWidget (QWidget *parent)

virtual const char *	getDefaultIconTitle (void) const

virtual const char *	getDefaultTitle (void) const

virtual const char *	getDefaultWidgetName (void) const

virtual SbBool	glScheduleRedraw (void)

virtual void	initGraphic (void)

virtual void	initOverlayGraphic (void)

virtual void	processEvent (QEvent *event)

virtual SbBool	processSoEvent (const SoEvent *const event)

virtual void	redraw (void)

virtual void	redrawOverlay (void)

virtual void	sizeChanged (const SbVec2s &size)

virtual void	widgetChanged (QWidget *widget)

Protected Member Functions inherited from SoQtGLWidget
	SoQtGLWidget (QWidget const parent=NULL, const char const name=NULL, const SbBool embed=TRUE, const int glmodes=SO_GL_RGB, const SbBool build=TRUE)

	~SoQtGLWidget ()

QWidget *	buildWidget (QWidget *parent)

float	getGLAspectRatio (void) const

SbVec2s	getGLSize (void) const

float	getGlxAspectRatio (void) const

SbVec2s	getGlxSize (void) const

void	glFlushBuffer (void)

void	glLockNormal (void)

void	glLockOverlay (void)

void	glSwapBuffers (void)

void	glUnlockNormal (void)

void	glUnlockOverlay (void)

SbBool	isRGBMode (void)

SbBool	isStereoBuffer (void) const

void	setGLSize (const SbVec2s size)

void	setGlxSize (const SbVec2s size)

void	setStereoBuffer (SbBool flag)

Protected Member Functions inherited from SoQtComponent
	SoQtComponent (QWidget const parent=NULL, const char const name=NULL, const SbBool embed=TRUE)

void	addVisibilityChangeCallback (SoQtComponentVisibilityCB const func, void const user=NULL)

void	registerWidget (QWidget *widget)

void	removeVisibilityChangeCallback (SoQtComponentVisibilityCB const func, void const user=NULL)

void	setBaseWidget (QWidget *widget)

void	setClassName (const char *const name)

void	unregisterWidget (QWidget *widget)

Additional Inherited Members
Protected Attributes inherited from SoQtGLWidget
SbBool	drawToFrontBuffer

SbBool	waitForExpose

Detailed Description

The SoQtRenderArea class adds scene graph handling and event management.

The SoQtRenderArea class is a component that adds scene graph management and input device event handling to the SoQtGLWidget component.

The class has many convenient methods for controlling aspects of the rendering, like for instance transparency, aliasing and for scheduling of redraws.

Native toolkit events are caught by SoQtRenderArea components, translated to Coin SoEvent instances and passed on to the scene graph, in case the user is doing interactive operations on for instance Coin geometry draggers.

SoQtRenderArea is the first non-abstract component in its inheritance hierarchy that you can use directly from client application code to set up a scene graph viewer canvas.

For an SoQtRenderArea component to properly display your scene graph, it must contain an SoCamera-derived node and at least one SoLight-derived light source node.

Here's a complete, stand-alone example on how to set up an SoQtRenderArea with a scene graph:

#include <Inventor/Qt/SoQt.h>
#include <Inventor/Qt/SoQtRenderArea.h>
 
#include <Inventor/nodes/SoCube.h>
#include <Inventor/nodes/SoRotor.h>
#include <Inventor/nodes/SoArray.h>
#include <Inventor/nodes/SoDirectionalLight.h>
#include <Inventor/nodes/SoPerspectiveCamera.h>
#include <Inventor/nodes/SoSeparator.h>
 
// Set up a simple scene graph, just for demonstration purposes.
static SoSeparator *
get_scene_graph(void)
{
  SoSeparator * root = new SoSeparator;
 
  SoGroup * group = new SoGroup;
 
  SoRotor * rotor = new SoRotor;
  rotor->rotation = SbRotation(SbVec3f(0.2, 0.5, 0.9), M_PI/4.0);
  group->addChild(rotor);
 
  SoCube * cube = new SoCube;
  group->addChild(cube);
 
  SoArray * array = new SoArray;
  array->origin = SoArray::CENTER;
  array->addChild(group);
  array->numElements1 = 2;
  array->numElements2 = 2;
  array->separation1 = SbVec3f(4, 0, 0);
  array->separation2 = SbVec3f(0, 4, 0);
 
  root->addChild(array);
  return root;
}
 
int
main(int argc, char ** argv)
{
  QWidget* window = SoQt::init(argv[0]);
 
  SoSeparator * root = new SoSeparator;
  root->ref();
 
  SoPerspectiveCamera * camera;
  root->addChild(camera = new SoPerspectiveCamera);
 
  root->addChild(new SoDirectionalLight);
 
  SoSeparator * userroot = get_scene_graph();
  root->addChild(userroot);
 
  SoQtRenderArea * renderarea = new SoQtRenderArea(window);
  camera->viewAll(userroot, renderarea->getViewportRegion());
  renderarea->setSceneGraph(root);
  renderarea->setBackgroundColor(SbColor(0.0f, 0.2f, 0.3f));
  if (argc > 1) {
    renderarea->setTitle(argv[1]);
    renderarea->setIconTitle(argv[1]);
  }
  renderarea->show();
 
  SoQt::show(window);
  SoQt::mainLoop();
 
  delete renderarea;
  root->unref();
 
  return 0;
}

Constructor & Destructor Documentation

◆ SoQtRenderArea() [1/2]

SoQtRenderArea::SoQtRenderArea	(	QWidget *	parent = NULL,
		const char *	name = NULL,
		SbBool	embed = TRUE,
		SbBool	mouseInput = TRUE,
		SbBool	keyboardInput = TRUE )

Public constructor.

◆ ~SoQtRenderArea()

SoQtRenderArea::~SoQtRenderArea ( )

Destructor.

◆ SoQtRenderArea() [2/2]

SoQtRenderArea::SoQtRenderArea	(	QWidget *	parent,
		const char *	name,
		SbBool	embed,
		SbBool	mouseInput,
		SbBool	keyboardInput,
		SbBool	build )

protected

Protected constructor used by derived classes.

Member Function Documentation

◆ actualOverlayRedraw()

void SoQtRenderArea::actualOverlayRedraw ( void )

protectedvirtual

This method renders the overlay scene.

◆ actualRedraw()

void SoQtRenderArea::actualRedraw ( void )

protectedvirtual

This method instantly redraws the normal (non-overlay) scene graph by calling SoSceneManager::render().

Subclasses may override this method to add their own rendering before or after Coin renders its scene graph.

The following is a complete example that demonstrates one way of adding both a background image and foreground (overlay) geometry to the "normal" rendering:

// This example shows how to put a permanent background image on
// your viewer canvas, below the 3D graphics, plus overlay
// foreground geometry.  Written by mortene.
// Copyright Kongsberg Oil & Gas Technologies 2002.
 
// *************************************************************************
 
#include <Inventor/Qt/SoQt.h>
#include <Inventor/Qt/viewers/SoQtExaminerViewer.h>
#include <Inventor/nodes/SoBaseColor.h>
#include <Inventor/nodes/SoCone.h>
#include <Inventor/nodes/SoCube.h>
#include <Inventor/nodes/SoImage.h>
#include <Inventor/nodes/SoLightModel.h>
#include <Inventor/nodes/SoOrthographicCamera.h>
#include <Inventor/nodes/SoRotationXYZ.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoTranslation.h>
 
#include <GL/gl.h>
 
// *************************************************************************
 
class MyExaminerViewer : public SoQtExaminerViewer {
 
public:
  MyExaminerViewer(QWidget* parent, const char * filename);
  ~MyExaminerViewer();
 
protected:
  virtual void actualRedraw(void);
 
private:
  SoSeparator * bckgroundroot;
  SoSeparator * foregroundroot;
  SoRotationXYZ * arrowrotation;
};
 
MyExaminerViewer::MyExaminerViewer(QWidget* parent, const char * filename)
  : SoQtExaminerViewer(parent)
{
  // Coin should not clear the pixel-buffer, so the background image
  // is not removed.
  this->setClearBeforeRender(FALSE, TRUE);
 
 
  // Set up background scene graph with image in it.
 
  this->bckgroundroot = new SoSeparator;
  this->bckgroundroot->ref();
 
  SoOrthographicCamera * cam = new SoOrthographicCamera;
  cam->position = SbVec3f(0, 0, 1);
  cam->height = 1;
  // SoImage will be at z==0.0.
  cam->nearDistance = 0.5;
  cam->farDistance = 1.5;
 
  SoImage * img = new SoImage;
  img->vertAlignment = SoImage::HALF;
  img->horAlignment = SoImage::CENTER;
  img->filename = filename;
 
  this->bckgroundroot->addChild(cam);
  this->bckgroundroot->addChild(img);
 
  // Set up foreground, overlaid scene graph.
 
  this->foregroundroot = new SoSeparator;
  this->foregroundroot->ref();
 
  SoLightModel * lm = new SoLightModel;
  lm->model = SoLightModel::BASE_COLOR;
 
  SoBaseColor * bc = new SoBaseColor;
  bc->rgb = SbColor(1, 1, 0);
 
  cam = new SoOrthographicCamera;
  cam->position = SbVec3f(0, 0, 5);
  cam->height = 10;
  cam->nearDistance = 0;
  cam->farDistance = 10;
 
  const double ARROWSIZE = 2.0;
 
  SoTranslation * posit = new SoTranslation;
  posit->translation = SbVec3f(-2.5 * ARROWSIZE, 1.5 * ARROWSIZE, 0);
 
  arrowrotation = new SoRotationXYZ;
  arrowrotation->axis = SoRotationXYZ::Z;
 
  SoTranslation * offset = new SoTranslation;
  offset->translation = SbVec3f(ARROWSIZE/2.0, 0, 0);
 
  SoCube * cube = new SoCube;
  cube->width = ARROWSIZE;
  cube->height = ARROWSIZE/15.0;
 
  this->foregroundroot->addChild(cam);
  this->foregroundroot->addChild(lm);
  this->foregroundroot->addChild(bc);
  this->foregroundroot->addChild(posit);
  this->foregroundroot->addChild(arrowrotation);
  this->foregroundroot->addChild(offset);
  this->foregroundroot->addChild(cube);
}
 
MyExaminerViewer::~MyExaminerViewer()
{
  this->bckgroundroot->unref();
  this->foregroundroot->unref();
}
 
void
MyExaminerViewer::actualRedraw(void)
{
  // Must set up the OpenGL viewport manually, as upon resize
  // operations, Coin won't set it up until the SoGLRenderAction is
  // applied again. And since we need to do glClear() before applying
  // the action..
  const SbViewportRegion vp = this->getViewportRegion();
  SbVec2s origin = vp.getViewportOriginPixels();
  SbVec2s size = vp.getViewportSizePixels();
  glViewport(origin[0], origin[1], size[0], size[1]);
 
  const SbColor col = this->getBackgroundColor();
  glClearColor(col[0], col[1], col[2], 0.0f);
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
  // Render our scene graph with the image.
  SoGLRenderAction * glra = this->getGLRenderAction();
  glra->apply(this->bckgroundroot);
 
 
  // Render normal scene graph.
  SoQtExaminerViewer::actualRedraw();
 
 
  // Increase arrow angle with 1/1000 degrees every frame.
  arrowrotation->angle = arrowrotation->angle.getValue() + (0.001 / M_PI * 180);
  // Render overlay front scene graph.
  glClear(GL_DEPTH_BUFFER_BIT);
  glra->apply(this->foregroundroot);
}
 
// *************************************************************************
 
int
main(int argc, char ** argv)
{
  if (argc != 2) {
    (void)fprintf(stderr, "\n\n\tUsage: %s <image-filename>\n\n", argv[0]);
    exit(1);
  }
 
  QWidget* window = SoQt::init(argv[0]);
 
  MyExaminerViewer * viewer = new MyExaminerViewer(window, argv[1]);
 
  viewer->setSceneGraph(new SoCone);
  viewer->show();
 
  SoQt::show(window);
  SoQt::mainLoop();
 
  delete viewer;
  return 0;
}
 
// *************************************************************************

Reimplemented in SoQtExaminerViewer, SoQtFlyViewer, SoQtPlaneViewer, and SoQtViewer.

◆ afterRealizeHook()

void SoQtRenderArea::afterRealizeHook ( void )

protectedvirtual

A function "hook" / callback invoked just after the window for the component has been realized.

Override this if you need specific initialization for your own component or viewer class to happen right after it has been made visible, but remember to call upwards in the inheritance hierarchy:

void
MyLittleViewer::afterRealizeHook(void)
{
  <superclass>::afterRealizeHook();
  // [own initialization here]
}

Reimplemented from SoQtComponent.

Reimplemented in SoQtExaminerViewer, SoQtFlyViewer, and SoQtPlaneViewer.

◆ getAntialiasing()

void SoQtRenderArea::getAntialiasing	(	SbBool &	smoothing,
		int &	numPasses ) const

This method returns the antialiasing used for the scene.

◆ getBackgroundColor()

const SbColor & SoQtRenderArea::getBackgroundColor ( void ) const

This method returns the background color for the scene.

◆ getBackgroundIndex()

int SoQtRenderArea::getBackgroundIndex ( void ) const

This method returns the index of the background color for the scene.

◆ getDefaultIconTitle()

const char * SoQtRenderArea::getDefaultIconTitle ( void ) const

protectedvirtual

This method returns the default icon title of the component.

It should be overridden by derived non-abstract classes so icons will get proper titles.

Reimplemented from SoQtComponent.

Reimplemented in SoQtExaminerViewer, SoQtFlyViewer, and SoQtPlaneViewer.

◆ getDefaultRedrawPriority()

uint32_t SoQtRenderArea::getDefaultRedrawPriority ( void )

static

This function returns the default redraw priority.

◆ getDefaultTitle()

const char * SoQtRenderArea::getDefaultTitle ( void ) const

protectedvirtual

This method returns the default window caption string of the component.

It should be overridden by derived non-abstract classes so the window and pop-up menu will get a proper title.

Reimplemented from SoQtComponent.

Reimplemented in SoQtExaminerViewer, SoQtFlyViewer, and SoQtPlaneViewer.

◆ getDefaultWidgetName()

const char * SoQtRenderArea::getDefaultWidgetName ( void ) const

protectedvirtual

This method returns the default name of a component widget class.

It should be overridden by derived non-abstract classes for the topmost widget in the component to have a proper name.

Reimplemented from SoQtComponent.

Reimplemented in SoQtExaminerViewer, SoQtFlyViewer, and SoQtPlaneViewer.

◆ getGLRenderAction()

SoGLRenderAction * SoQtRenderArea::getGLRenderAction ( void ) const

This method returns the SoGLRenderAction object for the normal scene.

◆ getOverlayBackgroundIndex()

int SoQtRenderArea::getOverlayBackgroundIndex ( void ) const

This method returns the index of the background for the overlay scene.

◆ getOverlayGLRenderAction()

SoGLRenderAction * SoQtRenderArea::getOverlayGLRenderAction ( void ) const

This method returns the SoGLRenderAction object for the overlay scene graph.

◆ getOverlaySceneGraph()

SoNode * SoQtRenderArea::getOverlaySceneGraph ( void )

This method returns the scene graph for the overlay scene.

◆ getOverlaySceneManager()

SoSceneManager * SoQtRenderArea::getOverlaySceneManager ( void ) const

This method returns the overlay scene SoSceneManager object.

◆ getRedrawPriority()

uint32_t SoQtRenderArea::getRedrawPriority ( void ) const

This method returns the redraw priority.

◆ getSceneGraph()

SoNode * SoQtRenderArea::getSceneGraph ( void )

virtual

This method returns a reference to the scene graph root node as set by the user.

See also: SoQtRenderArea::getSceneManager()

Reimplemented in SoQtViewer.

◆ getSceneManager()

SoSceneManager * SoQtRenderArea::getSceneManager ( void ) const

This method returns the normal scene SoSceneManager object.

Having a reference to the SoSceneManager instance is useful for getting at the real root node of the rendering scene graph, including camera, headlight and miscellaneous draw style nodes. The getSceneGraph() method will only return the user scene graph for SoQtRenderArea subclass SoQtViewer and further subclasses. The reason this is not always what you want is because certain actions (like the SoRayPickAction) needs to traverse a valid camera if it should work as expected.

If you need to get a pointer to the real root node use this method to get the SoSceneManager instance reference used by the SoQtRenderArea, then use SoSceneManager::getSceneGraph() to get the root node Coin uses for rendering.

◆ getTransparencyType()

SoGLRenderAction::TransparencyType SoQtRenderArea::getTransparencyType ( void ) const

This method returns the transparency type used for the scene.

◆ getViewportRegion()

const SbViewportRegion & SoQtRenderArea::getViewportRegion ( void ) const

This method returns the viewport region.

◆ glScheduleRedraw()

SbBool SoQtRenderArea::glScheduleRedraw ( void )

protectedvirtual

Will be called whenever scene graph needs to be redrawn. If this method return FALSE, redraw() will be called immediately.

Default method simply returns FALSE. Override this method to schedule a redraw and return TRUE if you're trying to do The Right Thing.

Reimplemented from SoQtGLWidget.

◆ initGraphic()

void SoQtRenderArea::initGraphic ( void )

protectedvirtual

This method is invoked to initialize the normal graphics.

Reimplemented from SoQtGLWidget.

◆ initOverlayGraphic()

void SoQtRenderArea::initOverlayGraphic ( void )

protectedvirtual

This method is invoked to initialize the overlay graphics.

Reimplemented from SoQtGLWidget.

◆ isAutoRedraw()

SbBool SoQtRenderArea::isAutoRedraw ( void ) const

This method returns whether redrawing is handled automatically not.

◆ isClearBeforeOverlayRender()

SbBool SoQtRenderArea::isClearBeforeOverlayRender ( void ) const

This method returns whether the overlay render buffer is cleared before each redraw or not.

◆ isClearBeforeRender()

SbBool SoQtRenderArea::isClearBeforeRender ( void ) const

This method returns whether the render buffer is cleared before each render.

◆ isClearZBufferBeforeRender()

SbBool SoQtRenderArea::isClearZBufferBeforeRender ( void ) const

This method returns whether the render buffer's z-buffer is cleared before each render.

◆ processEvent()

void SoQtRenderArea::processEvent ( QEvent * event )

protectedvirtual

Overrides SoQtGLWidget::processEvent() to try to convert toolkit-native events to Coin-generic events. If this succeeds, the generic SoEvent is forwarded to SoQtRenderArea::processSoEvent().

Reimplemented from SoQtGLWidget.

◆ processSoEvent()

SbBool SoQtRenderArea::processSoEvent ( const SoEvent *const event )

protectedvirtual

Toolkit-native events are tried to convert to Coin-generic events in the SoQtRenderArea::processEvent() method. If this succeeds, they are forwarded to this method.

This is a virtual method, and is overridden in its subclasses to catch events of particular interest to the viewer classes, for instance.

Return TRUE if the event was processed. If not it should be passed on further up in the inheritance hierarchy by the caller. This last point is extremely important to take note of if you are expanding the toolkit with your own viewer class.

This method is not part of the original SGI InventorXt API. Note that you can still override the toolkit-native processEvent() method instead of this "generic" method.

Reimplemented in SoQtExaminerViewer, SoQtFlyViewer, SoQtFullViewer, SoQtPlaneViewer, and SoQtViewer.

◆ redraw()

void SoQtRenderArea::redraw ( void )

protectedvirtual

This method is called from the render() method and takes care of setting up the context for OpenGL rendering (by making the OpenGL canvas the current context and specifying either the front or back buffer for rendering, depending on whether we're in single buffer or double buffer mode).

After setting up the OpenGL context, it calls actualRedraw() for the actual scene graph rendering to take place.

Finally, the OpenGL buffers are either swapped back-to-front (for double buffering) or flushed (for single buffering), and our OpenGL context is unlocked.

The application programmer may override this method if extreme low-level control of the rendering process is necessary. Usually, you should be able to get away with overriding actualRedraw() for special cases, though.

Implements SoQtGLWidget.

◆ redrawOnSelectionChange()

void SoQtRenderArea::redrawOnSelectionChange ( SoSelection * selection )

Do automatic redraw of the scene graph when a selection under the SoSelection node is changed.

Pass NULL to deactivate.

(Only one SoSelection node can be monitored at any given time. This is obviously a rather silly design flaw. We choose to match the original Inventor API here, but this will probably change in the next major revision of the library.)

◆ redrawOverlay()

void SoQtRenderArea::redrawOverlay ( void )

protectedvirtual

This method redraws the overlay scene.

Reimplemented from SoQtGLWidget.

◆ redrawOverlayOnSelectionChange()

void SoQtRenderArea::redrawOverlayOnSelectionChange ( SoSelection * selection )

Do automatic redraw of the scene graph in the overlay planes when a selection under the SoSelection node is changed.

Pass NULL to deactivate.

See also: SoQtRenderArea::redrawOnSelectionChange()

◆ registerDevice()

void SoQtRenderArea::registerDevice ( SoQtDevice * device )

This method adds device to the list of devices handling events for this component.

◆ render()

void SoQtRenderArea::render ( void )

This method causes the immediate rendering of the scene, by calling SoQtRenderArea::redraw().

◆ renderOverlay()

void SoQtRenderArea::renderOverlay ( void )

This method renders the overlay scene.

◆ scheduleOverlayRedraw()

void SoQtRenderArea::scheduleOverlayRedraw ( void )

This method schedules a redraw of the overlay scene.

◆ scheduleRedraw()

void SoQtRenderArea::scheduleRedraw ( void )

This method schedules a redraw to happen at a later time (when the application has processed its other events first).

◆ sendSoEvent()

SbBool SoQtRenderArea::sendSoEvent ( const SoEvent * event )

This method posts and processes an SoEvent object to the SoQtRenderArea-based component and returns the result value from the event handler. This is a synchronous operation.

◆ setAntialiasing()

void SoQtRenderArea::setAntialiasing	(	SbBool	smoothing,
		int	numPasses )

This method sets the antialiasing used for the scene.

The smoothing flag signifies whether or not line and point aliasing should be turned on. See documentation of SoGLRenderAction::setSmoothing(), which will be called from this function.

numPasses gives the number of re-renderings to do of the scene, blending together the results from slight "jitters" of the camera view into the OpenGL accumulation buffer. For further information, see documentation of SoGLRenderAction::setNumPasses() and SoQtGLWidget::setAccumulationBuffer().

◆ setAutoRedraw()

void SoQtRenderArea::setAutoRedraw ( SbBool enable )

This method sets whether redrawing should be handled automatically or not when data in the scene graph changes.

The default setting causes the render area to automatically trigger a redraw of the scene graph contents.

◆ setBackgroundColor()

void SoQtRenderArea::setBackgroundColor ( const SbColor & color )

This method sets the background color of the scene.

◆ setBackgroundIndex()

void SoQtRenderArea::setBackgroundIndex ( int idx )

This method sets the index of the background color for the scene.

◆ setClearBeforeOverlayRender()

void SoQtRenderArea::setClearBeforeOverlayRender ( SbBool enable )

This method sets whether the overlay render buffer should be cleared before each render or not.

◆ setClearBeforeRender()

void SoQtRenderArea::setClearBeforeRender	(	SbBool	enable,
		SbBool	zbEnable = TRUE )

This method sets whether the render buffer should be cleared before rendering.

The first argument specifies whether or not to clear out the pixels in the buffer, the second argument specifies whether or not the z-buffer values should be cleared between renderings.

Setting the first argument to FALSE can for instance be used when you want to clear out the buffer yourself, for instance by drawing a background image "under" the 3D scene rendered by Coin / Inventor.

◆ setColorMap()

void SoQtRenderArea::setColorMap	(	int	start,
		int	num,
		const SbColor *	colors )

This method sets the colormap for the scene.

◆ setEventCallback()

void SoQtRenderArea::setEventCallback	(	SoQtRenderAreaEventCB *	func,
		void *	user = NULL )

This method sets the render area event callback.

◆ setGLRenderAction()

void SoQtRenderArea::setGLRenderAction ( SoGLRenderAction * action )

This method sets the SoGLRenderAction object for the normal scene.

◆ setOverlayBackgroundIndex()

void SoQtRenderArea::setOverlayBackgroundIndex ( int idx )

This method sets the index of the background for the overlay scene.

◆ setOverlayColorMap()

void SoQtRenderArea::setOverlayColorMap	(	int	start,
		int	num,
		const SbColor *	colors )

This method sets the colormap for the overlay scene.

◆ setOverlayGLRenderAction()

void SoQtRenderArea::setOverlayGLRenderAction ( SoGLRenderAction * action )

This method sets the SoGLRenderAction object for rendering the overlay scene graph.

◆ setOverlaySceneGraph()

void SoQtRenderArea::setOverlaySceneGraph ( SoNode * scene )

This method sets the scene graph to render for the overlay bitmap planes.

It will automatically take care of setting up overplay planes in the OpenGL canvas if the OpenGL hardware and driver support it.

Important note: not all graphics hardware and / or drivers for graphics hardware support overlay planes, so application programmers are advised to find some other way of accomplishing what they want to do before resorting to using overlay planes. Using overlay planes will in practice severely limit the portability of applications which depend on them being available.

See also: setSceneGraph(), getOverlaySceneGraph()

◆ setOverlaySceneManager()

void SoQtRenderArea::setOverlaySceneManager ( SoSceneManager * manager )

This method sets the overlay scene SoSceneManager object.

The previously set scene manager is not freed and will leak unless the user frees it.

◆ setRedrawPriority()

void SoQtRenderArea::setRedrawPriority ( uint32_t priority )

This method sets the redraw priority.

◆ setSceneGraph()

void SoQtRenderArea::setSceneGraph ( SoNode * scene )

virtual

This method sets the scene graph to be rendered in the normal bitmap planes.

See also: getSceneGraph(), setOverlaySceneGraph()

Reimplemented in SoQtViewer.

◆ setSceneManager()

void SoQtRenderArea::setSceneManager ( SoSceneManager * manager )

This method sets the normal scene SoSceneManager object.

The previously set scene manager is deleted, and there is no way to currently avoid that. This might change in the future.

◆ setTransparencyType()

void SoQtRenderArea::setTransparencyType ( SoGLRenderAction::TransparencyType type )

This method sets the transparency type to be used for the scene.

◆ setViewportRegion()

void SoQtRenderArea::setViewportRegion ( const SbViewportRegion & region )

This method sets the viewport region.

◆ sizeChanged()

void SoQtRenderArea::sizeChanged ( const SbVec2s & size )

protectedvirtual

Called internally from within the SoQt library when the widget embedded in a component changes its size, which is usually triggered by end-user interaction.

This method is then invoked to notify the component that the size has changed. It is called from the top and all the way down to the bottom, the size being adjusted to take into account extra decorations having been added at each level in the component class hierarchy.

Reimplemented from SoQtGLWidget.

Reimplemented in SoQtFullViewer, and SoQtViewer.

◆ unregisterDevice()

void SoQtRenderArea::unregisterDevice ( SoQtDevice * device )

This method removes device from the list of devices handling events for this component.

◆ widgetChanged()

void SoQtRenderArea::widgetChanged ( QWidget * w )

protectedvirtual

This is the method which gets called whenever we change which OpenGL widget is used.

Should be overridden in subclasses which directly or indirectly store the return value from the SoQtGLWidget::getGLWidget() method.

See also: sizeChanged()

Reimplemented from SoQtGLWidget.

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

SoQtRenderArea.h
SoQtRenderArea.cpp

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ SoQtRenderArea() [1/2]

◆ ~SoQtRenderArea()

◆ SoQtRenderArea() [2/2]

Member Function Documentation

◆ actualOverlayRedraw()

◆ actualRedraw()

◆ afterRealizeHook()

◆ getAntialiasing()

◆ getBackgroundColor()

◆ getBackgroundIndex()

◆ getDefaultIconTitle()

◆ getDefaultRedrawPriority()

◆ getDefaultTitle()

◆ getDefaultWidgetName()

◆ getGLRenderAction()

◆ getOverlayBackgroundIndex()

◆ getOverlayGLRenderAction()

◆ getOverlaySceneGraph()

◆ getOverlaySceneManager()

◆ getRedrawPriority()

◆ getSceneGraph()

◆ getSceneManager()

◆ getTransparencyType()

◆ getViewportRegion()

◆ glScheduleRedraw()

◆ initGraphic()

◆ initOverlayGraphic()

◆ isAutoRedraw()

◆ isClearBeforeOverlayRender()

◆ isClearBeforeRender()

◆ isClearZBufferBeforeRender()

◆ processEvent()

◆ processSoEvent()

◆ redraw()

◆ redrawOnSelectionChange()

◆ redrawOverlay()

◆ redrawOverlayOnSelectionChange()

◆ registerDevice()

◆ render()

◆ renderOverlay()

◆ scheduleOverlayRedraw()

◆ scheduleRedraw()

◆ sendSoEvent()

◆ setAntialiasing()

◆ setAutoRedraw()

◆ setBackgroundColor()

◆ setBackgroundIndex()

◆ setClearBeforeOverlayRender()

◆ setClearBeforeRender()

◆ setColorMap()

◆ setEventCallback()

◆ setGLRenderAction()

◆ setOverlayBackgroundIndex()

◆ setOverlayColorMap()

◆ setOverlayGLRenderAction()

◆ setOverlaySceneGraph()

◆ setOverlaySceneManager()

◆ setRedrawPriority()

◆ setSceneGraph()

◆ setSceneManager()

◆ setTransparencyType()

◆ setViewportRegion()

◆ sizeChanged()

◆ unregisterDevice()

◆ widgetChanged()