sowriteaction(3)
NAME
SoWriteAction
SYNOPSIS
#include <Inventor/actions/SoWriteAction.h> Inherits SoAction.
Detailed Description
The SoWriteAction class writes a scene graph to file.
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, '%s0, s.getString());root->unref();
return 0; - }
- See also:
- SoOutput
- 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)
Constructor & Destructor Documentation
- 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.
Member Function Documentation
- 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.
- Referenced by SoAction::initClasses().
- SoOutput * SoWriteAction::getOutput (void) const
- Returns a pointer to the SoOutput object we're using when writing the scene graph.
- Referenced by beginTraversal(), SoBlinker::getBoundingBox(),
SoShuttle::initClass(), SoPendulum::initClass(),
SoVRMLParent::search(), SoPath::write(), SoNode::write(), and
SoVRMLScript::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.
Author
- Generated automatically by Doxygen for Coin from the source code.