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vtkCellArray Class Reference

object to represent cell connectivity. More...

#include <vtkCellArray.h>

Inheritance diagram for vtkCellArray:

[legend]Collaboration diagram for vtkCellArray:

[legend]List of all members.

Public Methods
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	InitTraversal ()
int	GetNextCell (vtkIdType &npts, vtkIdType *&pts)
void	GetCell (vtkIdType loc, vtkIdType &npts, vtkIdType *&pts)
vtkIdType	InsertNextCell (vtkCell *cell)
vtkIdType	InsertNextCell (vtkIdType npts, 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, 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 ()
vtkIdType	GetNumberOfCells ()
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 ()
vtkDataArray *	GetData ()
void	Squeeze ()
Static Public Methods
int	IsTypeOf (const char *type)
vtkCellArray *	SafeDownCast (vtkObject *o)
vtkCellArray *	New ()
Protected Methods
	vtkCellArray ()
	~vtkCellArray ()
Protected Attributes
vtkIdType	NumberOfCells
vtkIdType	InsertLocation
vtkIdType	TraversalLocation
vtkIdTypeArray *	Ia

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Detailed Description

object to represent cell connectivity.

Date:

2001/11/12 12:47:42

Revision:

1.84

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

Examples:

vtkCellArray (Examples)

Tests:

vtkCellArray (Tests)

Definition at line 74 of file vtkCellArray.h.

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Constructor & Destructor Documentation

vtkCellArray::vtkCellArray (    )  [protected]

vtkCellArray::~vtkCellArray (    )  [protected]

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Member Function Documentation

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

Return the class name as a string. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h. Reimplemented from vtkObject.

int vtkCellArray::IsTypeOf (  const char *    type )  [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 vtkTypeMacro found in vtkSetGet.h. Reimplemented from vtkObject.

virtual int vtkCellArray::IsA (  const char *    type )  [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 vtkTypeMacro found in vtkSetGet.h. Reimplemented from vtkObject.

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

Will cast the supplied object to vtkObject* is this is a safe operation (i.e., a safe downcast); otherwise NULL is returned. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h. Reimplemented from vtkObject.

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 84 of file vtkCellArray.h.

void vtkCellArray::Initialize (    )  [inline]

Free any memory and reset to an empty state. Definition at line 90 of file vtkCellArray.h.

vtkIdType vtkCellArray::GetNumberOfCells (    )  [inline]

Get the number of cells in the array. Definition at line 96 of file vtkCellArray.h.

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 107 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 114 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 335 of file vtkCellArray.h.

vtkIdType vtkCellArray::GetSize (    )  [inline]

Get the size of the allocated connectivity array. Definition at line 123 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 131 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 351 of file vtkCellArray.h.

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

Insert a cell object. Return the cell id of the cell. Definition at line 308 of file vtkCellArray.h.

vtkIdType vtkCellArray::InsertNextCell (  vtkIdType    npts, 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 257 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 273 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 290 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 298 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 303 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 167 of file vtkCellArray.h.

vtkIdType vtkCellArray::GetTraversalLocation (    )  [inline]

Get/Set the current traversal location. Definition at line 173 of file vtkCellArray.h.

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

Get/Set the current traversal location. Definition at line 175 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 182 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 359 of file vtkCellArray.h.

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

Replace the point ids of the cell with a different list of point ids. Definition at line 373 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 199 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 382 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.

vtkDataArray* vtkCellArray::GetData (    )  [inline]

Return the underlying data as a data array. Definition at line 222 of file vtkCellArray.h.

void vtkCellArray::Reset (    )  [inline]

Reuse list. Reset to initial condition. Definition at line 326 of file vtkCellArray.h.

void vtkCellArray::Squeeze (    )  [inline]

Reclaim any extra memory. Definition at line 231 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.

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Member Data Documentation

vtkIdType vtkCellArray::NumberOfCells [protected]

Definition at line 247 of file vtkCellArray.h.

vtkIdType vtkCellArray::InsertLocation [protected]

Definition at line 248 of file vtkCellArray.h.

vtkIdType vtkCellArray::TraversalLocation [protected]

Definition at line 249 of file vtkCellArray.h.

vtkIdTypeArray* vtkCellArray::Ia [protected]

Definition at line 250 of file vtkCellArray.h.

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

• Common/vtkCellArray.h

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