The SoPath class is a container class for traversal path descriptions. More...

#include <Inventor/SoPath.h>

Inheritance diagram for SoPath:

Public Member Functions
	SoPath (const int approxlength=4)

	SoPath (SoNode *const head)

	SoPath (const SoPath &rhs)

SoPath &	operator= (const SoPath &rhs)

virtual SoType	getTypeId (void) const
	Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and "downward" casting. More...

void	setHead (SoNode *const head)

SoNode *	getHead (void) const

void	append (const int childindex)

void	append (SoNode *const node)

void	append (const SoPath *const frompath)

void	push (const int childindex)

void	pop (void)

SoNode *	getTail (void) const

SoNode *	getNode (const int index) const

SoNode *	getNodeFromTail (const int index) const

int	getIndex (const int index) const

int	getIndexFromTail (const int index) const

int	getLength (void) const

void	truncate (const int length)

int	findFork (const SoPath *const path) const

int	findNode (const SoNode *const node) const

SbBool	containsNode (const SoNode *const node) const

SbBool	containsPath (const SoPath *const path) const

SoPath *	copy (const int startfromnodeindex=0, int numnodes=0) const

void	insertIndex (SoNode *const parent, const int newindex)

void	removeIndex (SoNode *const parent, const int oldindex)

void	replaceIndex (SoNode const parent, const int index, SoNode const newchild)

SbBool	isRelevantNotification (SoNotList *const l) const

virtual void	write (SoWriteAction *action)

Public Member Functions inherited from SoBase
void	ref (void) const

void	unref (void) const

void	unrefNoDelete (void) const

int32_t	getRefCount (void) const

void	touch (void)

SbBool	isOfType (SoType type) const
	Returns `TRUE` if the type of this object is either of the same type or inherited from type. More...

virtual SbName	getName (void) const

virtual void	setName (const SbName &newname)

virtual void	startNotify (void)

virtual void	notify (SoNotList *l)

void	addAuditor (void *const auditor, const SoNotRec::Type type)

void	removeAuditor (void *const auditor, const SoNotRec::Type type)

const SoAuditorList &	getAuditors (void) const

virtual void	addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)

SbBool	shouldWrite (void)

void	assertAlive (void) const

Static Public Member Functions
static void	initClass (void)

static SoType	getClassTypeId (void)

static SoPath *	getByName (const SbName name)

static int	getByName (const SbName name, SoPathList &l)

Static Public Member Functions inherited from SoBase
static void	initClass (void)
	Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

static SoType	getClassTypeId (void)
	This static method returns the SoType object associated with objects of this class.

static void	addName (SoBase const base, const char const name)

static void	removeName (SoBase const base, const char const name)

static void	incrementCurrentWriteCounter (void)

static void	decrementCurrentWriteCounter (void)

static SoBase *	getNamedBase (const SbName &name, SoType type)

static int	getNamedBases (const SbName &name, SoBaseList &baselist, SoType type)

static SbBool	read (SoInput input, SoBase &base, SoType expectedtype)

static void	setInstancePrefix (const SbString &c)

static void	setTraceRefs (SbBool trace)

static SbBool	getTraceRefs (void)

static SbBool	connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)

static SbBool	readRoute (SoInput *input)

Protected Member Functions
virtual	~SoPath ()

void	auditPath (const SbBool flag)

Protected Member Functions inherited from SoBase
	SoBase (void)

virtual	~SoBase ()

virtual void	destroy (void)

SbBool	hasMultipleWriteRefs (void) const

SbBool	writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const

void	writeFooter (SoOutput *out) const

virtual const char *	getFileFormatName (void) const

virtual SoNotRec	createNotRec (void)

Friends
SbBool	operator== (const SoPath &lhs, const SoPath &rhs)

SbBool	operator!= (const SoPath &lhs, const SoPath &rhs)

Additional Inherited Members
Protected Types inherited from SoBase
enum	BaseFlags { IS_ENGINE = 0x01, IS_GROUP = 0x02 }

Static Protected Member Functions inherited from SoBase
static uint32_t	getCurrentWriteCounter (void)

static void	staticDataLock (void)

static void	staticDataUnlock (void)

Detailed Description

The SoPath class is a container class for traversal path descriptions.

SoPath objects contain a list of SoNode pointers and a list of child indices. Indices are necessary to disambiguate situations where a node uses the same node as a child multiple times.

Paths can be export and imported to/from file, like other SoBase derived objects. Read the documentation on the write() method to see how the file format is.

It's important to know the difference between this class and SoFullPath when working with paths. SoPath::getTail() will return the first node in the path that doesn't inherit SoGroup, and getLength() returns the number of nodes down to this node.

If you need the actual path length, or the actual tail node, you need to cast the path to SoFullPath.

Constructor & Destructor Documentation

◆ SoPath() [1/3]

SoPath::SoPath ( const int approxlength = 4 )

The default constructor. approxlength is used to indicate in advance the length of the path to minimize the number of reallocations.

◆ SoPath() [2/3]

SoPath::SoPath ( SoNode *const head )

A constructor. The argument is set as the head (and only) node of the path.

◆ SoPath() [3/3]

SoPath::SoPath ( const SoPath & rhs )

Copy constructor. Not part of the original Open Inventor API.

◆ ~SoPath()

SoPath::~SoPath ( void )

protectedvirtual

The destructor is protected as destruction of SoPath instances happens through unref() (as for all objects derived from classes inheriting SoBase).

Member Function Documentation

◆ operator=()

SoPath & SoPath::operator= ( const SoPath & rhs )

Assignment operator, copies the rhs path into this. Not part of the original Open Inventor API.

◆ getTypeId()

SoType SoPath::getTypeId ( void ) const

virtual

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and "downward" casting.

Usage example:

void foo(SoNode * node)
{
  if (node->getTypeId() == SoFile::getClassTypeId()) {
    SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type
  }
}

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: 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 for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Implements SoBase.

◆ setHead()

void SoPath::setHead ( SoNode *const node )

This method sets the head of the path to node. If the object already has a path set, it will be truncated.

◆ getHead()

SoNode * SoPath::getHead ( void ) const

This method returns the head of the path, or NULL if the path is empty.

◆ append() [1/3]

void SoPath::append ( const int childindex )

This function appends the childindex child of the path's tail to the end of the path. It can only be used after the head is set.

◆ append() [2/3]

void SoPath::append ( SoNode *const node )

This function adds node to the end if it is a child of the current tail. If path is empty, this is equivalent to calling setHead().

◆ append() [3/3]

void SoPath::append ( const SoPath *const frompath )

This method appends the path to the end of the path if the head of frompath is either the tail of the path or a child of the path's tail. If the head of frompath is used multiple times as a child of the path tail, the lowest child index is used.

◆ push()

void SoPath::push ( const int childindex )

inline

This method pushes the child at childindex on the tail on the path.

◆ pop()

void SoPath::pop ( void )

inline

This method pops the tail off the path.

◆ getTail()

SoNode * SoPath::getTail ( void ) const

This method returns the tail node of the path. Please note that this method only considers group nodes without hidden children (nodes inheriting SoGroup) when finding the tail.

If you want to find the real tail node (also below node kits and VRML nodes with hidden children), you have to use SoFullPath::getTail(). You don't have to create an SoFullPath instance to do this, just cast the SoPath instance to SoFullPath before gettting the tail node:

SoNode * tail = static_cast<SoFullPath*>(path)->getTail();

◆ getNode()

SoNode * SoPath::getNode ( const int index ) const

This method returns the node at index in the path, counted from 0 at the head.

◆ getNodeFromTail()

SoNode * SoPath::getNodeFromTail ( const int index ) const

This method returns the node at index in the path, counting from the tail. The index argument should be zero or positive.

◆ getIndex()

int SoPath::getIndex ( const int index ) const

This method returns the child index of the node at index in the path.

◆ getIndexFromTail()

int SoPath::getIndexFromTail ( const int index ) const

This method returns the child index of the node at index in the path, counting from the tail. The index argument should be zero or positive.

◆ getLength()

int SoPath::getLength ( void ) const

This method returns the number of nodes in the path. Only the "visible" nodes are counted, i.e. hidden nodes of e.g. nodekits are not included.

If you need the actual path length, you need to cast your path to SoFullPath and use SoFullPath::getLength().

◆ truncate()

void SoPath::truncate ( const int length )

This method truncates the path to the given length (i.e. all nodes in the path list from index length and onwards will be removed from the path list).

◆ findFork()

int SoPath::findFork ( const SoPath *const path ) const

This method returns the index of the last node that is the same for both paths, or -1 if the paths don't even start on the same node.

◆ findNode()

int SoPath::findNode ( const SoNode *const node ) const

Returns the index of node if found in the full path (possibly also in the normally hidden parts), or -1 otherwise.

Note that this method is not part of the original Open Inventor API.

◆ containsNode()

SbBool SoPath::containsNode ( const SoNode *const node ) const

This method returns TRUE is node is contained somewhere in the full path (possibly also in the normally hidden parts), and FALSE otherwise.

◆ containsPath()

SbBool SoPath::containsPath ( const SoPath *const path ) const

This method returns TRUE if path is contained in the path, and FALSE otherwise.

◆ copy()

SoPath * SoPath::copy	(	const int	startfromnodeindex = `0`,
		int	numnodes = `0`
	)		const

This method returns a copy of the path starting at startfromnodeindex with length numnodes. If numnodes is 0 (default) the path will be copied to the end.

The returned SoPath instance will have an initial reference count of 0. It is the caller's responsibility to ref() and unref() it according to use.

◆ getByName() [1/2]

SoPath * SoPath::getByName ( const SbName name )

static

This static method is for retrieving an SoPath by it's name. The last registered SoPath with the given name is returned, or NULL if no SoPath by name exists.

◆ getByName() [2/2]

int SoPath::getByName	(	const SbName	name,
		SoPathList &	l
	)

static

This static method is for finding all the paths with a given name and append them to the l list. The number of SoPath instances with name found is returned.

◆ insertIndex()

void SoPath::insertIndex	(	SoNode *const	parent,
		const int	newindex
	)

This method is called when a node in the path chain has a child added, to update the index of it's child.

newindex is the index of the child which was inserted. If newindex is lower than the index value of the child node stored in the path, the path is updated accordingly.

◆ removeIndex()

void SoPath::removeIndex	(	SoNode *const	parent,
		const int	oldindex
	)

This method is called when a node in the path chain has a child removed, to update the index of it's child.

oldindex was the index of the removed child. If oldindex is lower than or equal to the index value of the child node stored in the path, the path is updated accordingly.

◆ replaceIndex()

void SoPath::replaceIndex	(	SoNode *const	parent,
		const int	index,
		SoNode *const	newchild
	)

This method is called when a node newchild replaces a node in the path. index is the position of the child which has been replaced.

◆ isRelevantNotification()

SbBool SoPath::isRelevantNotification ( SoNotList *const l ) const

Return TRUE if the notification chain l will affect the path. l will affect the path either if the notification is in the path (the notification started on a field in a node in the path), or off the path (the notification started in a non-separator node that is left of the path's node).

◆ write()

void SoPath::write ( SoWriteAction * action )

virtual

This method is used to write the contents of an SoPath.

A path is written as:

Path {
  HEAD-NODE-OF-SUBGRAPH
  NUMBER-OF-INDICES
  INDEX0
  INDEX1
  ...
}

[The rest of the documentation for this method only explains the reason behind a mismatch in behavior between the original Open Inventor and Coin. Don't read it if you're not taking a particular interest. (Short version: we do SoPath export in a somewhat more inefficient way to avoid the potential for bugs).]

Note that unlike Open Inventor, we write the complete subgraph below the head node. Only writing the parts of the subgraph affecting the state for nodes within the path is error prone if a subgraph is written out as part of path before it is written out "properly". Consider writing a scene graph which looks like this (in memory):

DEF top_sep Separator {
  Cone { }
  DEF a_sphere Sphere { }
  Cube { }
}
DEF path_switch PathSwitch {
  path Path {
    ...path from "top_sep" to "a_sphere"...
  }
}

..if we now do:

SoSeparator * root = new SoSeparator;
root->addChild([ptr to path_switch]);
root->addChild([ptr to top_sep]);
SoWriteAction wa;
wa.apply(root);

..we would get the scene graph exported like this:

Separator {
  DEF path_switch PathSwitch {
    path Path {
      DEF top_sep Separator {
        DEF a_sphere Sphere {
        }
      }
      1
      0
    }
  }
  USE top_sep
}

..and as you can see, both the Cone and the Cube nodes has vanished, as they was not important for the part per se, and not written as part of it.

This is why we do full subgraph export for head nodes in paths.

◆ auditPath()

void SoPath::auditPath ( const SbBool flag )

protected

Set whether or not to audit the nodes in the path to detect changes.

Friends And Related Function Documentation

◆ operator==

SbBool operator==	(	const SoPath &	lhs,
		const SoPath &	rhs
	)

friend

Compares contents of path lhs and path rhs, and returns TRUE if they are equal.

◆ operator!=

SbBool operator!=	(	const SoPath &	lhs,
		const SoPath &	rhs
	)