TGeoIterator Class Reference

A geometry iterator.

A geometry iterator that sequentially follows all nodes of the geometrical hierarchy of a volume. The iterator has to be initiated with a top volume pointer:

TGeoIterator next(myVolume);

One can use the iterator as any other in ROOT:

TGeoNode *node;
while ((node=next())) {
   ...
}

The iterator can perform 2 types of iterations that can be selected via:

next.SetType(Int_t type);

Here TYPE can be:

• 0 (default) - 'first daughter next' behavior
• 1 - iteration at the current level only

Supposing the tree structure looks like:

TOP ___ A_1 ___ A1_1 ___ A11_1
   |       |        |___ A12_1
   |      |_____A2_1 ___ A21_1
   |                |___ A21_2
   |___ B_1 ...

The order of iteration for TYPE=0 is: A_1, A1_1, A11_1, A12_1, A2_1, A21_1, A21_2, B_1, ...

The order of iteration for TYPE=1 is: A_1, B_1, ... At any moment during iteration, TYPE can be changed. If the last iterated node is for instance A1_1 and the iteration type was 0, one can do:

next.SetType(1);

The next iterated nodes will be the rest of A daughters: A2,A3,... The iterator will return 0 after finishing all daughters of A.

During iteration, the following can be retrieved:

• Top volume where iteration started: TGeoIterator::GetTopVolume()
• Node at level I in the current branch: TGeoIterator::GetNode(Int_t i)
• Iteration type: TGeoIterator::GetType()
• Global matrix of the current node with respect to the top volume: TGeoIterator::GetCurrentMatrix()

The iterator can be reset by changing (or not) the top volume:

TGeoIterator::Reset(TGeoVolume *top);

Example:

We want to find out a volume named "MyVol" in the hierarchy of TOP volume.

TIter next(TOP);
TGeoNode *node;
TString name("MyVol");
while ((node=next()))
   if (name == node->GetVolume()->GetName()) return node->GetVolume();

Definition at line 244 of file TGeoNode.h.

Public Member Functions
	TGeoIterator (const TGeoIterator &iter)
	Copy ctor.
	TGeoIterator (TGeoVolume *top)
	Geometry iterator for a branch starting with a TOP node.
virtual	~TGeoIterator ()
	Destructor.
const TGeoMatrix *	GetCurrentMatrix () const
	Returns global matrix for current node.
Int_t	GetIndex (Int_t i) const
Int_t	GetLevel () const
TGeoNode *	GetNode (Int_t level) const
	Returns current node at a given level.
void	GetPath (TString &path) const
	Returns the path for the current node.
TGeoVolume *	GetTopVolume () const
Int_t	GetType () const
TGeoIteratorPlugin *	GetUserPlugin () const
TGeoNode *	Next ()
	Returns next node.
TGeoNode *	operator() ()
	Returns next node.
TGeoIterator &	operator= (const TGeoIterator &iter)
	Assignment.
void	Reset (TGeoVolume *top=0)
	Resets the iterator for volume TOP.
void	SetPluginAutoexec (Bool_t mode)
void	SetTopName (const char *name)
	Set the top name for path.
void	SetType (Int_t type)
void	SetUserPlugin (TGeoIteratorPlugin *plugin)
	Set a plugin.
void	Skip ()
	Stop iterating the current branch.
void	Up ()

Protected Member Functions
	TGeoIterator ()

Private Member Functions
void	IncreaseArray ()
	Increase by 30 the size of the array.

Private Attributes
Int_t *	fArray = nullptr
Int_t	fLevel = 0
TGeoHMatrix *	fMatrix = nullptr
Bool_t	fMustResume = kFALSE
Bool_t	fMustStop = kFALSE
TGeoIteratorPlugin *	fPlugin = nullptr
Bool_t	fPluginAutoexec = kFALSE
TGeoVolume *	fTop = nullptr
TString	fTopName
Int_t	fType = 0

#include <TGeoNode.h>

Constructor & Destructor Documentation

TGeoIterator() [1/3]

TGeoIterator::TGeoIterator ( )

inlineprotected

Definition at line 261 of file TGeoNode.h.

TGeoIterator() [2/3]

TGeoIterator::TGeoIterator

(

TGeoVolume *

top

)

Geometry iterator for a branch starting with a TOP node.

Definition at line 930 of file TGeoNode.cxx.

TGeoIterator() [3/3]

TGeoIterator::TGeoIterator

(

const TGeoIterator &

iter

)

Copy ctor.

Definition at line 947 of file TGeoNode.cxx.

~TGeoIterator()

TGeoIterator::~TGeoIterator ( )

virtual

Destructor.

Definition at line 965 of file TGeoNode.cxx.

Member Function Documentation

GetCurrentMatrix()

const TGeoMatrix * TGeoIterator::GetCurrentMatrix

(

)

const

Returns global matrix for current node.

Definition at line 1083 of file TGeoNode.cxx.

GetIndex()

Int_t TGeoIterator::GetIndex ( Int_t  i ) const

inline

Definition at line 275 of file TGeoNode.h.

GetLevel()

Int_t TGeoIterator::GetLevel ( ) const

inline

Definition at line 276 of file TGeoNode.h.

GetNode()

TGeoNode * TGeoIterator::GetNode

(

Int_t

level

)

const

Returns current node at a given level.

Definition at line 1099 of file TGeoNode.cxx.

GetPath()

void TGeoIterator::GetPath

(

TString &

path

)

const

Returns the path for the current node.

Definition at line 1110 of file TGeoNode.cxx.

GetTopVolume()

TGeoVolume * TGeoIterator::GetTopVolume ( ) const

inline

Definition at line 282 of file TGeoNode.h.

GetType()

Int_t TGeoIterator::GetType ( ) const

inline

Definition at line 283 of file TGeoNode.h.

GetUserPlugin()

TGeoIteratorPlugin * TGeoIterator::GetUserPlugin ( ) const

inline

Definition at line 280 of file TGeoNode.h.

IncreaseArray()

void TGeoIterator::IncreaseArray ( )

private

Increase by 30 the size of the array.

Definition at line 1127 of file TGeoNode.cxx.

Next()

TGeoNode * TGeoIterator::Next

(

)

Returns next node.

Definition at line 996 of file TGeoNode.cxx.

operator()()

TGeoNode * TGeoIterator::operator()

(

)

Returns next node.

Definition at line 1075 of file TGeoNode.cxx.

operator=()

TGeoIterator & TGeoIterator::operator=

(

const TGeoIterator &

iter

)

Assignment.

Definition at line 974 of file TGeoNode.cxx.

Reset()

void TGeoIterator::Reset

(

TGeoVolume *

top = 0

)

Resets the iterator for volume TOP.

Definition at line 1138 of file TGeoNode.cxx.

SetPluginAutoexec()

void TGeoIterator::SetPluginAutoexec ( Bool_t  mode )

inline

Definition at line 286 of file TGeoNode.h.

SetTopName()

void TGeoIterator::SetTopName

(

const char *

name

)

Set the top name for path.

Definition at line 1149 of file TGeoNode.cxx.

SetType()

void TGeoIterator::SetType ( Int_t  type )

inline

Definition at line 287 of file TGeoNode.h.

SetUserPlugin()

void TGeoIterator::SetUserPlugin

(

TGeoIteratorPlugin *

plugin

)

Set a plugin.

Definition at line 1196 of file TGeoNode.cxx.

Skip()

void TGeoIterator::Skip

(

)

Stop iterating the current branch.

The iteration of the next node will behave as if the branch starting from the current node (included) is not existing.

Definition at line 1158 of file TGeoNode.cxx.

Up()

void TGeoIterator::Up ( )

inline

Definition at line 272 of file TGeoNode.h.

Member Data Documentation

fArray

Int_t* TGeoIterator::fArray = nullptr

private

Definition at line 252 of file TGeoNode.h.

fLevel

Int_t TGeoIterator::fLevel = 0

private

Definition at line 250 of file TGeoNode.h.

fMatrix

TGeoHMatrix* TGeoIterator::fMatrix = nullptr

private

Definition at line 253 of file TGeoNode.h.

fMustResume

Bool_t TGeoIterator::fMustResume = kFALSE

private

Definition at line 248 of file TGeoNode.h.

fMustStop

Bool_t TGeoIterator::fMustStop = kFALSE

private

Definition at line 249 of file TGeoNode.h.

fPlugin

TGeoIteratorPlugin* TGeoIterator::fPlugin = nullptr

private

Definition at line 256 of file TGeoNode.h.

fPluginAutoexec

Bool_t TGeoIterator::fPluginAutoexec = kFALSE

private

Definition at line 257 of file TGeoNode.h.

fTop

TGeoVolume* TGeoIterator::fTop = nullptr

private

Definition at line 247 of file TGeoNode.h.

fTopName

TString TGeoIterator::fTopName

private

Definition at line 254 of file TGeoNode.h.

fType

Int_t TGeoIterator::fType = 0

private

Definition at line 251 of file TGeoNode.h.

Libraries for TGeoIterator:

---

The documentation for this class was generated from the following files:

• geom/geom/inc/TGeoNode.h
• geom/geom/src/TGeoNode.cxx