vtkCellArray Class Reference

#include <vtkCellArray.h>

Inheritance diagram for vtkCellArray:

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Collaboration diagram for vtkCellArray:

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List of all members.

Detailed Description

object to represent cell connectivity

vtkCellArray is a supporting object that explicitly represents cell connectivity. The cell array structure is a raw integer list of the form: (n,id1,id2,...,idn, n,id1,id2,...,idn, ...) where n is the number of points in the cell, and id is a zero-offset index into an associated point list.

Advantages of this data structure are its compactness, simplicity, and easy interface to external data. However, it is totally inadequate for random access. This functionality (when necessary) is accomplished by using the vtkCellTypes and vtkCellLinks objects to extend the definition of the data structure.

See also:: vtkCellTypes vtkCellLinks

Tests:: vtkCellArray (Tests)

Definition at line 45 of file vtkCellArray.h.


Public Types
typedef vtkObject	Superclass
Public Member Functions
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
void	InitTraversal ()
int	GetNextCell (vtkIdType &npts, vtkIdType *&pts)
void	GetCell (vtkIdType loc, vtkIdType &npts, vtkIdType *&pts)
vtkIdType	InsertNextCell (vtkCell *cell)
vtkIdType	InsertNextCell (vtkIdType npts, const vtkIdType *pts)
vtkIdType	InsertNextCell (vtkIdList *pts)
vtkIdType	InsertNextCell (int npts)
void	InsertCellPoint (vtkIdType id)
void	UpdateCellCount (int npts)
void	ReverseCell (vtkIdType loc)
void	ReplaceCell (vtkIdType loc, int npts, const vtkIdType *pts)
int	GetMaxCellSize ()
vtkIdType *	WritePointer (const vtkIdType ncells, const vtkIdType size)
void	SetCells (vtkIdType ncells, vtkIdTypeArray *cells)
void	DeepCopy (vtkCellArray *ca)
void	Reset ()
unsigned long	GetActualMemorySize ()

int	Allocate (const vtkIdType sz, const int ext=1000)

void	Initialize ()

virtual vtkIdType	GetNumberOfCells ()

virtual void	SetNumberOfCells (vtkIdType)

vtkIdType	EstimateSize (vtkIdType numCells, int maxPtsPerCell)

vtkIdType	GetSize ()

vtkIdType	GetNumberOfConnectivityEntries ()

vtkIdType	GetInsertLocation (int npts)

vtkIdType	GetTraversalLocation ()
void	SetTraversalLocation (vtkIdType loc)

vtkIdType	GetTraversalLocation (vtkIdType npts)

vtkIdType *	GetPointer ()

vtkIdTypeArray *	GetData ()

void	Squeeze ()
Static Public Member Functions
static int	IsTypeOf (const char *type)
static vtkCellArray *	SafeDownCast (vtkObject *o)
static vtkCellArray *	New ()
Protected Member Functions
	vtkCellArray ()
	~vtkCellArray ()
Protected Attributes
vtkIdType	NumberOfCells
vtkIdType	InsertLocation
vtkIdType	TraversalLocation
vtkIdTypeArray *	Ia

Member Typedef Documentation

typedef vtkObject vtkCellArray::Superclass

Reimplemented from vtkObject.

Definition at line 48 of file vtkCellArray.h.

Constructor & Destructor Documentation

vtkCellArray::vtkCellArray ( ) [protected]

vtkCellArray::~vtkCellArray ( ) [protected]

Member Function Documentation

virtual const char* vtkCellArray::GetClassName ( ) [virtual]

Reimplemented from vtkObject.

static int vtkCellArray::IsTypeOf ( const char * name ) [static]

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkObject.

virtual int vtkCellArray::IsA ( const char * name ) [virtual]

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkObject.

static vtkCellArray* vtkCellArray::SafeDownCast ( vtkObject * o ) [static]

Reimplemented from vtkObject.

void vtkCellArray::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)			`[virtual]`

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkObject.

static vtkCellArray* vtkCellArray::New ( ) [static]

Instantiate cell array (connectivity list).

Reimplemented from vtkObject.

int vtkCellArray::Allocate	(	const vtkIdType	sz,
		const int	ext = `1000`
	)			`[inline]`

Allocate memory and set the size to extend by.

Definition at line 56 of file vtkCellArray.h.

void vtkCellArray::Initialize ( ) [inline]

Free any memory and reset to an empty state.

Definition at line 62 of file vtkCellArray.h.

virtual vtkIdType vtkCellArray::GetNumberOfCells ( ) [virtual]

Get the number of cells in the array.

virtual void vtkCellArray::SetNumberOfCells ( vtkIdType ) [virtual]

Set the number of cells in the array. DO NOT do any kind of allocation, advanced use only.

vtkIdType vtkCellArray::EstimateSize	(	vtkIdType	numCells,
		int	maxPtsPerCell
	)			`[inline]`

Utility routines help manage memory of cell array. EstimateSize() returns a value used to initialize and allocate memory for array based on number of cells and maximum number of points making up cell. If every cell is the same size (in terms of number of points), then the memory estimate is guaranteed exact. (If not exact, use Squeeze() to reclaim any extra memory.)

Definition at line 84 of file vtkCellArray.h.

void vtkCellArray::InitTraversal ( ) [inline]

A cell traversal methods that is more efficient than vtkDataSet traversal methods. InitTraversal() initializes the traversal of the list of cells.

Definition at line 91 of file vtkCellArray.h.

int vtkCellArray::GetNextCell	(	vtkIdType &	npts,
		vtkIdType *&	pts
	)			`[inline]`

A cell traversal methods that is more efficient than vtkDataSet traversal methods. GetNextCell() gets the next cell in the list. If end of list is encountered, 0 is returned.

Definition at line 320 of file vtkCellArray.h.

vtkIdType vtkCellArray::GetSize ( ) [inline]

Get the size of the allocated connectivity array.

Definition at line 100 of file vtkCellArray.h.

vtkIdType vtkCellArray::GetNumberOfConnectivityEntries ( ) [inline]

Get the total number of entries (i.e., data values) in the connectivity array. This may be much less than the allocated size (i.e., return value from GetSize().)

Definition at line 108 of file vtkCellArray.h.

void vtkCellArray::GetCell	(	vtkIdType	loc,
		vtkIdType &	npts,
		vtkIdType *&	pts
	)			`[inline]`

Internal method used to retrieve a cell given an offset into the internal array.

Definition at line 337 of file vtkCellArray.h.

vtkIdType vtkCellArray::InsertNextCell ( vtkCell * cell ) [inline]

Insert a cell object. Return the cell id of the cell.

Definition at line 293 of file vtkCellArray.h.

vtkIdType vtkCellArray::InsertNextCell	(	vtkIdType	npts,
		const vtkIdType *	pts
	)			`[inline]`

Create a cell by specifying the number of points and an array of point id's. Return the cell id of the cell.

Definition at line 236 of file vtkCellArray.h.

vtkIdType vtkCellArray::InsertNextCell ( vtkIdList * pts ) [inline]

Create a cell by specifying a list of point ids. Return the cell id of the cell.

Definition at line 254 of file vtkCellArray.h.

vtkIdType vtkCellArray::InsertNextCell ( int npts ) [inline]

Create cells by specifying count, and then adding points one at a time using method InsertCellPoint(). If you don't know the count initially, use the method UpdateCellCount() to complete the cell. Return the cell id of the cell.

Definition at line 272 of file vtkCellArray.h.

void vtkCellArray::InsertCellPoint ( vtkIdType id ) [inline]

Used in conjunction with InsertNextCell(int npts) to add another point to the list of cells.

Definition at line 281 of file vtkCellArray.h.

void vtkCellArray::UpdateCellCount ( int npts ) [inline]

Used in conjunction with InsertNextCell(int npts) and InsertCellPoint() to update the number of points defining the cell.

Definition at line 287 of file vtkCellArray.h.

vtkIdType vtkCellArray::GetInsertLocation ( int npts ) [inline]

Computes the current insertion location within the internal array. Used in conjunction with GetCell(int loc,...).

Definition at line 144 of file vtkCellArray.h.

vtkIdType vtkCellArray::GetTraversalLocation ( ) [inline]

Get/Set the current traversal location.

Definition at line 150 of file vtkCellArray.h.

void vtkCellArray::SetTraversalLocation ( vtkIdType loc ) [inline]

Get/Set the current traversal location.

Definition at line 152 of file vtkCellArray.h.

vtkIdType vtkCellArray::GetTraversalLocation ( vtkIdType npts ) [inline]

Computes the current traversal location within the internal array. Used in conjunction with GetCell(int loc,...).

Definition at line 159 of file vtkCellArray.h.

void vtkCellArray::ReverseCell ( vtkIdType loc ) [inline]

Special method inverts ordering of current cell. Must be called carefully or the cell topology may be corrupted.

Definition at line 345 of file vtkCellArray.h.

void vtkCellArray::ReplaceCell	(	vtkIdType	loc,
		int	npts,
		const vtkIdType *	pts
	)			`[inline]`

Replace the point ids of the cell with a different list of point ids.

Definition at line 360 of file vtkCellArray.h.

int vtkCellArray::GetMaxCellSize ( )

Returns the size of the largest cell. The size is the number of points defining the cell.

vtkIdType* vtkCellArray::GetPointer ( ) [inline]

Get pointer to array of cell data.

Definition at line 176 of file vtkCellArray.h.

vtkIdType * vtkCellArray::WritePointer	(	const vtkIdType	ncells,
		const vtkIdType	size
	)			`[inline]`

Get pointer to data array for purpose of direct writes of data. Size is the total storage consumed by the cell array. ncells is the number of cells represented in the array.

Definition at line 371 of file vtkCellArray.h.

void vtkCellArray::SetCells	(	vtkIdType	ncells,
		vtkIdTypeArray *	cells
	)

Define multiple cells by providing a connectivity list. The list is in the form (npts,p0,p1,...p(npts-1), repeated for each cell). Be careful using this method because it discards the old cells, and anything referring these cells becomes invalid (for example, if BuildCells() has been called see vtkPolyData). The traversal location is reset to the beginning of the list; the insertion location is set to the end of the list.

void vtkCellArray::DeepCopy ( vtkCellArray * ca )

Perform a deep copy (no reference counting) of the given cell array.

vtkIdTypeArray* vtkCellArray::GetData ( ) [inline]

Return the underlying data as a data array.

Definition at line 199 of file vtkCellArray.h.

void vtkCellArray::Reset ( ) [inline]

Reuse list. Reset to initial condition.

Definition at line 311 of file vtkCellArray.h.

void vtkCellArray::Squeeze ( ) [inline]

Reclaim any extra memory.

Definition at line 208 of file vtkCellArray.h.

unsigned long vtkCellArray::GetActualMemorySize ( )

Return the memory in kilobytes consumed by this cell array. Used to support streaming and reading/writing data. The value returned is guaranteed to be greater than or equal to the memory required to actually represent the data represented by this object. The information returned is valid only after the pipeline has been updated.