[vtk-developers] SetStencilConnection() in vtkImageAlgorithm
David Gobbi
david.gobbi at gmail.com
Fri Nov 19 16:55:17 EST 2010
Hi Berk,
Since I've caught your ear, I might as well get your opinion on one
other matter. It also has to do with image stencils.
Right now some filters have a SetStencil() method that takes a
vtkImageStencilData object directly. I'm converting these to
SetStencilConnection() methods. But I'm thinking of adding the
SetStencilConnection() method directly to vtkImageAlgorithm, and
here is why: I want to be able to probe any ImageAlgorithm to see
if that algorithm accepts a stencil as an input (and I want to make
more of the existing image filters use stencils, I've written an iterator
to simplify this.)
In my proposal, an image algorithm that uses a stencil will do this in
its constructor:
vtkSomeFilter::vtkSomeFilter()
{
this->SetNumberOfInputs(2);
this->SetStencilPortNumber(1);
}
The default value of StencilPortNumber set to -1 by vtkImageAlgorithm
(i.e. no stencil input), so the existence of a stencil port can be
checked. The vtkImageAlgorithm::SetStencilConnection() method
will connect its argument to the port, or do nothing if the port is -1.
You can see the new vtkImageAlgorithm code on Gerrit:
http://review.source.kitware.com/388
If you think that SetStencilConnection() belongs in the individual
filters (e.g. like SetSelectionConnection()) then that is fine. The
only answer I will not accept is "derive a new base class from
vtkImageAlgorithm". ;)
David
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