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When applied to a scene, this action writes its contents to the stream contained within an SoOutput instance. This can be a file, a memory buffer or a system filehandle like stdout
, for instance.
More...
#include <Inventor/actions/SoWriteAction.h>
Public Member Functions | |
virtual SoType | getTypeId (void) const |
SoWriteAction (void) | |
SoWriteAction (SoOutput *out) | |
virtual | ~SoWriteAction () |
SoOutput * | getOutput (void) const |
void | continueToApply (SoNode *node) |
void | continueToApply (SoPath *path) |
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) |
virtual SbBool | shouldCompactPathLists (void) const |
Static Protected Member Functions | |
static SoEnabledElementsList * | getClassEnabledElements (void) |
static SoActionMethodList * | getClassActionMethods (void) |
When applied to a scene, this action writes its contents to the stream contained within an SoOutput instance. This can be a file, a memory buffer or a system filehandle like stdout
, for instance.
All information considered part of the scene graph should be written out, including not only nodes, but also the nodes' field values, global fields (at least those with connections inside the scene the action is applied to), engines in the scene, paths, etc.
The scene is written in the Open Inventor file format. Files in this format can be parsed into their scene graph structures by using the SoDB::readAll() method (SoDB also contains a few other import methods you can use).
Here's a complete, stand-alone usage example which shows how to write a scene graph to a memory buffer:
#include <Inventor/SoDB.h> #include <Inventor/actions/SoWriteAction.h> #include <Inventor/nodes/SoCone.h> #include <Inventor/nodes/SoSeparator.h> static char * buffer; static size_t buffer_size = 0; static void * buffer_realloc(void * bufptr, size_t size) { buffer = (char *)realloc(bufptr, size); buffer_size = size; return buffer; } static SbString buffer_writeaction(SoNode * root) { SoOutput out; buffer = (char *)malloc(1024); buffer_size = 1024; out.setBuffer(buffer, buffer_size, buffer_realloc); SoWriteAction wa(&out); wa.apply(root); SbString s(buffer); free(buffer); return s; } int main(int argc, char ** argv) { SoDB::init(); SoSeparator * root = new SoSeparator; root->ref(); root->addChild(new SoCone); SbString s = buffer_writeaction(root); (void)fprintf(stdout, "%s\n", s.getString()); root->unref(); return 0; }
SoWriteAction::SoWriteAction | ( | void | ) |
Default constructor. Output will be written to stdout
in ASCII format.
SoWriteAction::SoWriteAction | ( | SoOutput * | out | ) |
Constructor. Output will be written via the out object.
SoWriteAction::~SoWriteAction | ( | void | ) | [virtual] |
Destructor.
SoType SoWriteAction::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.
SoType SoWriteAction::getClassTypeId | ( | void | ) | [static] |
Returns the run-time type object associated with instances of this class.
Reimplemented from SoAction.
Referenced by SoNode::writeS().
void SoWriteAction::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.
void SoWriteAction::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.
const SoEnabledElementsList & SoWriteAction::getEnabledElements | ( | void | ) | const [protected, virtual] |
Returns a list of the elements used by action instances of this class upon traversal operations.
Reimplemented from SoAction.
SoEnabledElementsList * SoWriteAction::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.
SoActionMethodList * SoWriteAction::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.
void SoWriteAction::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.
SoOutput * SoWriteAction::getOutput | ( | void | ) | const |
Returns a pointer to the SoOutput object we're using when writing the scene graph.
Referenced by beginTraversal(), SoSwitch::write(), SoShuttle::write(), SoPendulum::write(), SoPath::write(), SoNode::write(), SoGroup::write(), SoBlinker::write(), SoBaseKit::write(), SoVRMLScript::write(), and SoVRMLParent::write().
void SoWriteAction::continueToApply | ( | SoNode * | node | ) |
Applies the write method to the subgraph starting at node with the current SoOutput instance, without resetting any of the internal state of the action instance.
This should normally be for internal use only.
References SoAction::apply().
Referenced by SoPath::write(), and SoField::writeConnection().
void SoWriteAction::continueToApply | ( | SoPath * | path | ) |
Applies the write method to path with the current SoOutput instance, without resetting any of the internal state of the action instance.
This should normally be for internal use only.
References SoAction::apply().
void SoWriteAction::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 SoNodeSensor::attach(), getOutput(), SoOutput::isBinary(), SoOutput::resolveRoutes(), SoDelayQueueSensor::setPriority(), SoOutput::setStage(), SoAction::traverse(), and SoOutput::write().
SbBool SoWriteAction::shouldCompactPathLists | ( | void | ) | const [protected, virtual] |
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.
Compact path lists are not implemented in Coin (yet), but if they are, SoWriteAction should return FALSE
here -- it would only be extra overhead for the SoWriteAction to have pathlists compacted before traversal.
Seems like a silly optimization to me, though.. :^/ 20000306 mortene.
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Generated on Mon Feb 23 16:34:11 2009 for Coin by Doxygen. 1.5.8