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Usage
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.
To create an instance of class vtkCellArray, simply invoke
its constructor as follows
obj = vtkCellArray
Methods
The class vtkCellArray has several methods that can be used.
They are listed below. Note that the documentation is
translated automatically from the VTK sources, and may not
be completely intelligible. When in doubt, consult the VTK
website. In the methods listed below, obj is an instance of
the vtkCellArray class.
* string = obj.GetClassName ()
* int = obj.IsA (string name)
* vtkCellArray = obj.NewInstance ()
* vtkCellArray = obj.SafeDownCast (vtkObject o)
* int = obj.Allocate (vtkIdType sz, int ext) - Free any
memory and reset to an empty state.
* obj.Initialize () - Free any memory and reset to an empty
state.
* vtkIdType = obj.GetNumberOfCells () - Get the number of
cells in the array.
* obj.SetNumberOfCells (vtkIdType ) - Set the number of
cells in the array. DO NOT do any kind of allocation,
advanced use only.
* vtkIdType = obj.EstimateSize (vtkIdType numCells, int
maxPtsPerCell) - A cell traversal methods that is more
efficient than vtkDataSet traversal methods. InitTraversal
() initializes the traversal of the list of cells.
* obj.InitTraversal () - A cell traversal methods that is
more efficient than vtkDataSet traversal methods.
InitTraversal() initializes the traversal of the list of
cells.
* vtkIdType = obj.GetSize () - 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().)
* vtkIdType = obj.GetNumberOfConnectivityEntries () -
Internal method used to retrieve a cell given an offset
into the internal array.
* vtkIdType = obj.InsertNextCell (vtkCell cell) - Insert a
cell object. Return the cell id of the cell.
* vtkIdType = obj.InsertNextCell (vtkIdList pts) - Create a
cell by specifying a list of point ids. Return the cell id
of the cell.
* vtkIdType = obj.InsertNextCell (int npts) - 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.
* obj.InsertCellPoint (vtkIdType id) - Used in conjunction
with InsertNextCell(int npts) to add another point to the
list of cells.
* obj.UpdateCellCount (int npts) - Used in conjunction with
InsertNextCell(int npts) and InsertCellPoint() to update
the number of points defining the cell.
* vtkIdType = obj.GetInsertLocation (int npts) - Computes
the current insertion location within the internal array.
Used in conjunction with GetCell(int loc,...).
* vtkIdType = obj.GetTraversalLocation () - Get/Set the
current traversal location.
* obj.SetTraversalLocation (vtkIdType loc) - Computes the
current traversal location within the internal array. Used
in conjunction with GetCell(int loc,...).
* vtkIdType = obj.GetTraversalLocation (vtkIdType npts) -
Special method inverts ordering of current cell. Must be
called carefully or the cell topology may be corrupted.
* obj.ReverseCell (vtkIdType loc) - Special method inverts
ordering of current cell. Must be called carefully or the
cell topology may be corrupted.
* int = obj.GetMaxCellSize () - Returns the size of the
largest cell. The size is the number of points defining
the cell.
* vtkIdType = obj.GetPointer () - 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.
* vtkIdType = obj.WritePointer (vtkIdType ncells, vtkIdType
size) - 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.
* obj.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.
* obj.DeepCopy (vtkCellArray ca) - Perform a deep copy (no
reference counting) of the given cell array.
* vtkIdTypeArray = obj.GetData () - Reuse list. Reset to
initial condition.
* obj.Reset () - Reuse list. Reset to initial condition.
* obj.Squeeze () - 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.
* long = obj.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.
* FreeMat_Documentation
* Visualization_Toolkit_Filtering_Classes
* Generated on Thu Jul 25 2013 17:18:30 for FreeMat by
doxygen_ 1.8.1.1
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