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SoCallbackAction

NAME

SoCallbackAction -

SYNOPSIS

#include <Inventor/actions/SoCallbackAction.h>

Inherits SoAction.

Inherited by SoVectorizeAction.

Detailed Description

The SoCallbackAction class invokes callbacks at specific nodes.

This action has mechanisms for tracking traversal position and traversal state. In combination with the ability to pass geometry primitives to callback actions set by the user, this does for instance make it rather straightforward to extract the geometry of a scene graph.

You should be able to use this action for most of your 'simple' traversal needs, instead of cooking up your own code, as the SoCallbackAction is rather flexible.

A common use of this action is to extract geometry of non-primitive shapes as triangles. A full-fledged example that demonstrates this on a scenegraph with two spheres follows:

    #include <Inventor/SoDB.h>
    #include <Inventor/SoPrimitiveVertex.h>
    #include <Inventor/actions/SoCallbackAction.h>
    #include <Inventor/nodes/SoCoordinate3.h>
    #include <Inventor/nodes/SoIndexedFaceSet.h>
    #include <Inventor/nodes/SoSeparator.h>
    #include <Inventor/nodes/SoShape.h>
    #include <Inventor/nodes/SoSphere.h>
    #include <Inventor/nodes/SoTranslation.h>
 
 
    static SoCoordinate3 * coord3 = NULL;
    static SoIndexedFaceSet * ifs = NULL;
 
    static int coord3idx = 0;
 
 
    static void
    triangle_cb(void * userdata, SoCallbackAction * action,
                const SoPrimitiveVertex * v1,
                const SoPrimitiveVertex * v2,
                const SoPrimitiveVertex * v3)
    {
      const SbVec3f vtx[] = { v1->getPoint(), v2->getPoint(), v3->getPoint() };
      const SbMatrix mm = action->getModelMatrix();
 
      SbVec3f vx[3];
      for (int j=0; j < 3; j++) { mm.multVecMatrix(vtx[j], vx[j]); }
 
      // (This is sub-optimal -- should scan for the same vertex
      // coordinates already being present in the SoCoordinate3
      // node. We'll get lots of duplicate coordinates from this.)
      coord3->point.setNum(coord3->point.getNum() + 3);
      coord3->point.setValues(coord3idx, 3, vx);
 
      int32_t indices[] = { coord3idx, coord3idx + 1, coord3idx + 2, -1 };
      coord3idx += 3;
 
      int oldsize = ifs->coordIndex.getNum();
      ifs->coordIndex.setNum(oldsize + 4);
      ifs->coordIndex.setValues(oldsize, 4, indices);
 
      // (Note that it would likely be desirable to grab normal vectors,
      // materials and / or texture coordinates in a real-world
      // application. How to do this is not shown by the above code,
      // but it is not much different from the extraction of vertex
      // coordinates.)
    }
 
 
    int
    main(void)
    {
      SoDB::init();
 
      SoSeparator * root = new SoSeparator;
      root->addChild(new SoSphere);
      SoTranslation * trans = new SoTranslation;
      trans->translation.setValue(10, 0, 0);
      root->addChild(trans);
      SoSphere * ss = new SoSphere;
      ss->radius = 3;
      root->addChild(ss);
 
      root->ref();
 
      coord3 = new SoCoordinate3;
      coord3->point.setNum(0);
      ifs = new SoIndexedFaceSet;
      ifs->coordIndex.setNum(0);
 
      SoCallbackAction ca;
      ca.addTriangleCallback(SoShape::getClassTypeId(), triangle_cb, NULL);
      ca.apply(root);
 
      root->unref();
 
      // [the generated SoCoordinate3 and SoIndexedFaceSet nodes would now
      // typically be used in a scenegraph in a viewer, or written to disk
      // or something]
 
      return 0;
    }
 

 

Public Types

enum Response { CONTINUE, ABORT, PRUNE }

Public Member Functions

virtual SoType getTypeId (void) const

SoCallbackAction (void)

SoCallbackAction (const SbViewportRegion &vp)

virtual ~SoCallbackAction ()

void setViewportRegion (const SbViewportRegion &vp)

typedef Response SoCallbackActionCB (void *userdata, SoCallbackAction *action, const SoNode *node)

void addPreCallback (const SoType type, SoCallbackActionCB *cb, void *userdata)

void addPostCallback (const SoType type, SoCallbackActionCB *cb, void *userdata)

void addPreTailCallback (SoCallbackActionCB *cb, void *userdata)

void addPostTailCallback (SoCallbackActionCB *cb, void *userdata)

void addTriangleCallback (const SoType type, SoTriangleCB *cb, void *userdata)

void addLineSegmentCallback (const SoType type, SoLineSegmentCB *cb, void *userdata)

void addPointCallback (const SoType type, SoPointCB *cb, void *userdata)

SoDecimationTypeElement::Type getDecimationType (void) const

float getDecimationPercentage (void) const

float getComplexity (void) const

SoComplexity::Type getComplexityType (void) const

int32_t getNumCoordinates (void) const

const SbVec3f & getCoordinate3 (const int index) const

const SbVec4f & getCoordinate4 (const int index) const

SoDrawStyle::Style getDrawStyle (void) const

unsigned short getLinePattern (void) const

float getLineWidth (void) const

float getPointSize (void) const

const SbName & getFontName (void) const

float getFontSize (void) const

SoLightModel::Model getLightModel (void) const

const SbVec3f & getLightAttenuation (void) const

void getMaterial (SbColor &ambient, SbColor &diffuse, SbColor &specular, SbColor &emission, float &shininess, float &transparency, const int index=0) const

SoMaterialBinding::Binding getMaterialBinding (void) const

uint32_t getNumNormals (void) const

const SbVec3f & getNormal (const int index) const

SoNormalBinding::Binding getNormalBinding (void) const

int32_t getNumProfileCoordinates (void) const

const SbVec2f & getProfileCoordinate2 (const int index) const

const SbVec3f & getProfileCoordinate3 (const int index) const

const SoNodeList & getProfile (void) const

SoShapeHints::VertexOrdering getVertexOrdering (void) const

SoShapeHints::ShapeType getShapeType (void) const

SoShapeHints::FaceType getFaceType (void) const

float getCreaseAngle (void) const

int32_t getNumTextureCoordinates (void) const

const SbVec2f & getTextureCoordinate2 (const int index) const

const SbVec3f & getTextureCoordinate3 (const int index) const

const SbVec4f & getTextureCoordinate4 (const int index) const

SoTextureCoordinateBinding::Binding getTextureCoordinateBinding (void) const

const SbColor & getTextureBlendColor (void) const

const unsigned char * getTextureImage (SbVec2s &size, int &numcomps) const

const unsigned char * getTextureImage (SbVec3s &size, int &numcomps) const

const SbMatrix & getTextureMatrix (void) const

SoTexture2::Model getTextureModel (void) const

SoTexture2::Wrap getTextureWrapS (void) const

SoTexture2::Wrap getTextureWrapT (void) const

SoTexture2::Wrap getTextureWrapR (void) const

const SbMatrix & getModelMatrix (void) const

SoUnits::Units getUnits (void) const

float getFocalDistance (void) const

const SbMatrix & getProjectionMatrix (void) const

const SbMatrix & getViewingMatrix (void) const

const SbViewVolume & getViewVolume (void) const

const SbViewportRegion & getViewportRegion (void) const

SoPickStyle::Style getPickStyle (void) const

int32_t getSwitch (void) const

Response getCurrentResponse (void) const

void invokePreCallbacks (const SoNode *const node)

void invokePostCallbacks (const SoNode *const node)

void invokeTriangleCallbacks (const SoShape *const shape, const SoPrimitiveVertex *const v1, const SoPrimitiveVertex *const v2, const SoPrimitiveVertex *const v3)

void invokeLineSegmentCallbacks (const SoShape *const shape, const SoPrimitiveVertex *const v1, const SoPrimitiveVertex *const v2)

void invokePointCallbacks (const SoShape *const shape, const SoPrimitiveVertex *const v)

SbBool shouldGeneratePrimitives (const SoShape *shape) const

virtual SoNode * getCurPathTail (void)

void setCurrentNode (SoNode *const node)

Static Public Member Functions

static SoType getClassTypeId (void)

static void addMethod (const SoType type, SoActionMethod method)

static void enableElement (const SoType type, const int stackindex)

static void initClass (void)

Protected Member Functions

virtual const SoEnabledElementsList & getEnabledElements (void) const

virtual void beginTraversal (SoNode *node)

Static Protected Member Functions

static SoEnabledElementsList * getClassEnabledElements (void)

static SoActionMethodList * getClassActionMethods (void)

Friends

class SoCallbackActionP

Member Enumeration Documentation

enum SoCallbackAction::Response

Response values for callback function.

Enumerator:

CONTINUE

Continue traversal as usual.

ABORT

Abort traversal immediately. No other callbacks are called after this has been returned.

PRUNE

Don't do traversal of neither the current node (if returning from a pre-traversal callback) nor its children.

If returned from a pre-callback, the post-callbacks will still be called. If returned from a post-callback, the behaviour will be the same as for returning CONTINUE.

Constructor & Destructor Documentation

SoCallbackAction::SoCallbackAction (void)

Default constructor. Will set the viewport to a standard viewport with size 640x512.

SoCallbackAction::SoCallbackAction (const SbViewportRegion & vp)

Constructor which lets you specify the viewport.

This constructor is an extension versus the Open Inventor API.

SoCallbackAction::~SoCallbackAction () [virtual]

Destructor.

Member Function Documentation

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

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

Usage example:

   void bar(SoAction * action)
   {
     if (action->getTypeId() == SoGLRenderAction::getClassTypeId()) {
       // safe downward cast, know the type
       SoGLRenderAction * glrender = (SoGLRenderAction *)action;
     }
     return; // ignore if not renderaction
   }
 

For application programmers wanting to extend the library with new actions: 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 Inventor/nodes/SoSubAction.h: SO_ACTION_SOURCE, SO_ACTION_INIT_CLASS and SO_ACTION_CONSTRUCTOR.

For more information on writing Coin extensions, see the SoAction class documentation.

Returns the actual type id of an object derived from a class inheriting SoAction. Needs to be overridden in all subclasses.

Implements SoAction.

Reimplemented in SoVectorizeAction, and SoVectorizePSAction.

SoType SoCallbackAction::getClassTypeId (void) [static]

Returns the run-time type object associated with instances of this class.

Reimplemented from SoAction.

Reimplemented in SoVectorizeAction, and SoVectorizePSAction.

Referenced by SoShape::invokeTriangleCallbacks().

void SoCallbackAction::addMethod (const SoType type, SoActionMethod method) [static]

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

Reimplemented in SoVectorizeAction, and SoVectorizePSAction.

void SoCallbackAction::enableElement (const SoType type, const int stackindex) [static]

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

Reimplemented in SoVectorizeAction, and SoVectorizePSAction.

const SoEnabledElementsList & SoCallbackAction::getEnabledElements (void) const [protected, virtual]

Returns a list of the elements used by action instances of this class upon traversal operations.

Reimplemented from SoAction.

Reimplemented in SoVectorizeAction, and SoVectorizePSAction.

SoEnabledElementsList * SoCallbackAction::getClassEnabledElements (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.

This method not available in the original OIV API, see SoSubAction.h for explanation.

Reimplemented from SoAction.

Reimplemented in SoVectorizeAction, and SoVectorizePSAction.

SoActionMethodList * SoCallbackAction::getClassActionMethods (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.

This method not available in the original OIV API, see SoSubAction.h for explanation.

Reimplemented from SoAction.

Reimplemented in SoVectorizeAction, and SoVectorizePSAction.

void SoCallbackAction::initClass (void) [static]

Initializes the run-time type system for this class, and sets up the enabled elements and action method list.

Reimplemented from SoAction.

Reimplemented in SoVectorizeAction, and SoVectorizePSAction.

Referenced by SoAction::initClasses().

void SoCallbackAction::setViewportRegion (const SbViewportRegion & vp)

Sets the viewport region for this action. When set, the viewport element is initialized right before a traversal starts, making it the current viewport.

This method is an extension versus the Open Inventor API.

Referenced by SoVectorizeAction::beginPage(), and SoVectorizeAction::beginViewport().

Response SoCallbackAction::SoCallbackActionCB (void * userdata, SoCallbackAction * action, const SoNode * node)

Callback functions need to be of this type. node is at the current traversal point in the scene graph.

void SoCallbackAction::addPreCallback (const SoType type, SoCallbackActionCB * cb, void * userdata)

Set a function cb to call before every node of type is traversed. cb will be called with userdata.

void SoCallbackAction::addPostCallback (const SoType type, SoCallbackActionCB * cb, void * userdata)

Set a function cb to call after every node of type has been traversed. cb will be called with userdata.

void SoCallbackAction::addPreTailCallback (SoCallbackActionCB * cb, void * userdata)

Set a function cb to call before the tail of a path is traversed. cb will be called with userdata.

void SoCallbackAction::addPostTailCallback (SoCallbackActionCB * cb, void * userdata)

Set a function cb to call after the tail of a path has been traversed. cb will be called with userdata.

void SoCallbackAction::addTriangleCallback (const SoType type, SoTriangleCB * cb, void * userdata)

Set a function cb to call when traversing a node of type which generates triangle primitives for rendering. cb will be called with userdata.

void SoCallbackAction::addLineSegmentCallback (const SoType type, SoLineSegmentCB * cb, void * userdata)

Set a function cb to call when traversing a node of type which generates line primitives for rendering. cb will be called with userdata.

void SoCallbackAction::addPointCallback (const SoType type, SoPointCB * cb, void * userdata)

Set a function cb to call when traversing a node of type which generates single point primitives for rendering. cb will be called with userdata.

SoDecimationTypeElement::Type SoCallbackAction::getDecimationType (void) const

Returns current decimation type setting.

References SoAction::state.

float SoCallbackAction::getDecimationPercentage (void) const

Returns current decimation percentage setting.

References SoAction::state.

float SoCallbackAction::getComplexity (void) const

Returns current complexity setting.

References SoAction::state.

SoComplexity::Type SoCallbackAction::getComplexityType (void) const

Returns current complexity type setting.

References SoAction::state.

int32_t SoCallbackAction::getNumCoordinates (void) const

Returns current number of coordinates in the state.

References SoAction::state.

const SbVec3f & SoCallbackAction::getCoordinate3 (const int index) const

Returns a coordinate triplet from the current state pool of coordinates.

References SoAction::state.

const SbVec4f & SoCallbackAction::getCoordinate4 (const int index) const

Returns a coordinate quartuplet from the current state pool of coordinates.

References SoAction::state.

SoDrawStyle::Style SoCallbackAction::getDrawStyle (void) const

Returns current draw style setting.

References SoAction::state.

unsigned short SoCallbackAction::getLinePattern (void) const

Returns current line pattern setting.

References SoAction::state.

float SoCallbackAction::getLineWidth (void) const

Returns current line width setting.

References SoLineWidthElement::get(), and SoAction::state.

float SoCallbackAction::getPointSize (void) const

Returns current point size setting.

References SoPointSizeElement::get(), and SoAction::state.

const SbName & SoCallbackAction::getFontName (void) const

Returns current fontname setting.

References SoAction::state.

float SoCallbackAction::getFontSize (void) const

Returns current fontsize setting.

References SoAction::state.

SoLightModel::Model SoCallbackAction::getLightModel (void) const

Returns current lightmodel setting.

References SoAction::state.

const SbVec3f & SoCallbackAction::getLightAttenuation (void) const

Returns current light attenuation setting.

References SoAction::state.

void SoCallbackAction::getMaterial (SbColor & ambient, SbColor & diffuse, SbColor & specular, SbColor & emission, float & shininess, float & transparency, const int index = 0) const

Returns current material settings.

References SoAction::state.

SoMaterialBinding::Binding SoCallbackAction::getMaterialBinding (void) const

Returns current materialbinding setting.

References SoAction::state.

uint32_t SoCallbackAction::getNumNormals (void) const

Returns current number of normals in the state.

References SoAction::state.

const SbVec3f & SoCallbackAction::getNormal (const int index) const

Returns the normal vectors at index from the current state.

References SoAction::state.

SoNormalBinding::Binding SoCallbackAction::getNormalBinding (void) const

Returns current normalbinding setting.

References SoAction::state.

int32_t SoCallbackAction::getNumProfileCoordinates (void) const

Returns current number of profile coordinates in the state.

References SoAction::state.

const SbVec2f & SoCallbackAction::getProfileCoordinate2 (const int index) const

Returns current number of SbVec2f profile coordinates in the state.

References SoAction::state.

const SbVec3f & SoCallbackAction::getProfileCoordinate3 (const int index) const

Returns current number of SbVec3f profile coordinates in the state.

References SoAction::state.

const SoNodeList & SoCallbackAction::getProfile (void) const

Returns current list of profile nodes.

References SoAction::state.

SoShapeHints::VertexOrdering SoCallbackAction::getVertexOrdering (void) const

Returns current vertexordering shapehint setting.

References SoAction::state.

SoShapeHints::ShapeType SoCallbackAction::getShapeType (void) const

Returns current shapetype hint setting.

References SoAction::state.

SoShapeHints::FaceType SoCallbackAction::getFaceType (void) const

Returns current facetype hint setting.

References SoAction::state.

float SoCallbackAction::getCreaseAngle (void) const

Returns current creaseangle setting.

References SoAction::state.

int32_t SoCallbackAction::getNumTextureCoordinates (void) const

Returns current number of texture coordinates in the traversal state.

References SoAction::state.

const SbVec2f & SoCallbackAction::getTextureCoordinate2 (const int index) const

Returns SbVec2f texture coordinate at index from the texture coordinate pool of the traversal state.

References SoAction::state.

const SbVec3f & SoCallbackAction::getTextureCoordinate3 (const int index) const

Returns SbVec3f texture coordinate at index from the texture coordinate pool of the traversal state.

This function is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.

Since:

Coin 2.0

References SoAction::state.

const SbVec4f & SoCallbackAction::getTextureCoordinate4 (const int index) const

Returns SbVec4f texture coordinate at index from the texture coordinate pool of the traversal state.

References SoAction::state.

SoTextureCoordinateBinding::Binding SoCallbackAction::getTextureCoordinateBinding (void) const

Returns current texturecoordinate binding setting.

References SoAction::state.

const SbColor & SoCallbackAction::getTextureBlendColor (void) const

Returns current texture blend color setting.

References SoAction::state.

const unsigned char * SoCallbackAction::getTextureImage (SbVec2s & size, int & numcomps) const

Returns current texture image settings.

References SoAction::state.

const unsigned char * SoCallbackAction::getTextureImage (SbVec3s & size, int & numcomps) const

Returns current 3D texture image settings.

This function is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.

Since:

Coin 2.0

References SoAction::state.

const SbMatrix & SoCallbackAction::getTextureMatrix (void) const

Returns current texture transformation matrix setting.

References SoAction::state.

SoTexture2::Model SoCallbackAction::getTextureModel (void) const

Returns current texturemapping model setting.

References SoAction::state.

SoTexture2::Wrap SoCallbackAction::getTextureWrapS (void) const

Returns current texture wrapping setting for the S coordinate.

References SoAction::state.

SoTexture2::Wrap SoCallbackAction::getTextureWrapT (void) const

Returns current texture wrapping setting for the T coordinate.

References SoAction::state.

SoTexture2::Wrap SoCallbackAction::getTextureWrapR (void) const

Returns current texture wrapping setting for the R coordinate.

This function is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.

Since:

Coin 2.0

References SoAction::state.

const SbMatrix & SoCallbackAction::getModelMatrix (void) const

Returns current model matrix.

References SoAction::state.

SoUnits::Units SoCallbackAction::getUnits (void) const

Returns current units setting.

References SoAction::state.

float SoCallbackAction::getFocalDistance (void) const

Returns current camera focal distance setting.

References SoAction::state.

const SbMatrix & SoCallbackAction::getProjectionMatrix (void) const

Returns current projection matrix.

References SoAction::state.

const SbMatrix & SoCallbackAction::getViewingMatrix (void) const

Returns current viewing matrix.

References SoAction::state.

const SbViewVolume & SoCallbackAction::getViewVolume (void) const

Returns current view volume setting.

References SoAction::state.

const SbViewportRegion & SoCallbackAction::getViewportRegion (void) const

Returns current viewport region setting.

This method is an extension versus the Open Inventor API.

References SoAction::getState().

SoPickStyle::Style SoCallbackAction::getPickStyle (void) const

Returns current pickstyle setting.

References SoAction::state.

int32_t SoCallbackAction::getSwitch (void) const

Returns last SoSwitch::whichChild setting during the traversal.

References SoAction::state.

SoCallbackAction::Response SoCallbackAction::getCurrentResponse (void) const

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

Referenced by SoNode::callbackS().

void SoCallbackAction::invokePreCallbacks (const SoNode *const node)

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

Invoke all 'pre traversal' callbacks.

References ABORT, CONTINUE, SoType::getData(), SoAction::getPathAppliedTo(), SoBase::getTypeId(), SoAction::getWhatAppliedTo(), PRUNE, and SoAction::setTerminated().

Referenced by SoNode::callbackS().

void SoCallbackAction::invokePostCallbacks (const SoNode *const node)

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

Invoke all 'post traversal' callbacks.

References ABORT, CONTINUE, SoType::getData(), SoAction::getPathAppliedTo(), SoBase::getTypeId(), SoAction::getWhatAppliedTo(), PRUNE, and SoAction::setTerminated().

Referenced by SoNode::callbackS().

void SoCallbackAction::invokeTriangleCallbacks (const SoShape *const shape, const SoPrimitiveVertex *const v1, const SoPrimitiveVertex *const v2, const SoPrimitiveVertex *const v3)

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

Invoke all 'triangle generation' callbacks.

References SoType::getData(), and SoShape::getTypeId().

Referenced by SoShape::invokeTriangleCallbacks().

void SoCallbackAction::invokeLineSegmentCallbacks (const SoShape *const shape, const SoPrimitiveVertex *const v1, const SoPrimitiveVertex *const v2)

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

Invoke all 'line segment generation' callbacks.

References SoType::getData(), and SoShape::getTypeId().

void SoCallbackAction::invokePointCallbacks (const SoShape *const shape, const SoPrimitiveVertex *const v)

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

Invoke all 'point' callbacks.

References SoType::getData(), and SoShape::getTypeId().

SbBool SoCallbackAction::shouldGeneratePrimitives (const SoShape * shape) const

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

Check from the shape nodes whether or not to generate primitives from the complex shapes. If there are no callbacks attached to the node types, making the primitives would only be a waste of CPU.

References SoType::getData(), and SoShape::getTypeId().

SoNode * SoCallbackAction::getCurPathTail (void) [virtual]

Returns the current tail of the traversal path for the callback action.

Reimplemented from SoAction.

void SoCallbackAction::setCurrentNode (SoNode *const node)

Used from nodes during traversal to keep a current node pointer in the action.

Referenced by SoNode::callbackS().

void SoCallbackAction::beginTraversal (SoNode * node) [protected, virtual]

This virtual method is called from SoAction::apply(), and is the entry point for the actual scenegraph traversal.

It can be overridden to initialize the action at traversal start, for specific initializations in the action subclasses inheriting SoAction.

Default method just calls traverse(), which any overridden implementation of the method must do too (or call SoAction::beginTraversal()) to trigger the scenegraph traversal.

Reimplemented from SoAction.

References CONTINUE, SoAction::getState(), and SoAction::traverse().

Author

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