
 Usage

vtkDataObjectSource is an abstract object that specifies
behavior and interface of field source objects. Field source
objects are source objects that create vtkFieldData (field
data) on output.
Concrete subclasses of vtkDataObjectSource must define
Update() and Execute() methods. The public method Update()
invokes network execution and will bring the network up-to-
date. The protected Execute() method actually does the work
of data creation/generation. The difference between the two
methods is that Update() implements input consistency checks
and modified time comparisons and then invokes the Execute()
which is an implementation of a particular algorithm.
vtkDataObjectSource provides a mechanism for invoking the
methods StartMethod() and EndMethod() before and after
object execution (via Execute()). These are convenience
methods you can use for any purpose (e.g., debugging info,
highlighting/notifying user interface, etc.) These methods
accept a single void* pointer that can be used to send data
to the methods. It is also possible to specify a function to
delete the argument via StartMethodArgDelete and
EndMethodArgDelete.
Another method, ProgressMethod() can be specified. Some
filters invoke this method periodically during their
execution. The use is similar to that of StartMethod() and
EndMethod().
An important feature of subclasses of vtkDataObjectSource is
that it is possible to control the memory-management model
(i.e., retain output versus delete output data). If enabled
the ReleaseDataFlag enables the deletion of the output data
once the downstream process object finishes processing the
data (please see text).
To create an instance of class vtkDataObjectSource, simply
invoke its constructor as follows

    obj = vtkDataObjectSource



 Methods

The class vtkDataObjectSource 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 vtkDataObjectSource class.

* string = obj.GetClassName ()
* int = obj.IsA (string name)
* vtkDataObjectSource = obj.NewInstance ()
* vtkDataObjectSource = obj.SafeDownCast (vtkObject o)
* vtkDataObject = obj.GetOutput () - Get the output field of
  this source.
* vtkDataObject = obj.GetOutput (int idx)
* obj.SetOutput (vtkDataObject )


* FreeMat_Documentation
* Visualization_Toolkit_Filtering_Classes
* Generated on Thu Jul 25 2013 17:18:30 for FreeMat by
  doxygen_ 1.8.1.1

