![]() |
http://www.sim.no http://www.coin3d.org |
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. More...
#include <Inventor/actions/SoCallbackAction.h>
Public Types | |
enum | Response { CONTINUE, ABORT, PRUNE } |
typedef Response | SoCallbackActionCB (void *userdata, SoCallbackAction *action, const SoNode *node) |
Public Member Functions | |
SoCallbackAction (void) | |
SoCallbackAction (const SbViewportRegion &vp) | |
virtual | ~SoCallbackAction () |
void | setViewportRegion (const SbViewportRegion &vp) |
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 void | initClass (void) |
Protected Member Functions | |
virtual void | beginTraversal (SoNode *node) |
Friends | |
class | SoCallbackActionP |
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; }
Callback functions need to be of this type. node is at the current traversal point in the scene graph.
Response values for callback function.
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.
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.
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().
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.
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.
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.
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 SoBase::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 SoBase::getTypeId().
Referenced by SoShape::invokeLineSegmentCallbacks().
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 SoBase::getTypeId().
Referenced by SoShape::invokePointCallbacks().
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 SoBase::getTypeId().
Referenced by SoShape::callback().
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().
Copyright © 1998-2007 by Systems in Motion AS. All rights reserved.
Generated on Mon Feb 28 2011 10:12:06 for Coin by Doxygen. 1.7.3