[vtkusers] how to derive vtkPloyDataAlgorithm class

[WangQ]

Dear Norman,
Thanks for the explanation. Please allow me sometime to digest, and I will get back to here if anything get me confused.
Regards,
Chiang

> Date: Sat, 2 Jan 2016 05:11:23 -0700
> From: juch at zhaw.ch
> To: vtkusers at vtk.org
> Subject: Re: [vtkusers] how to derive vtkPloyDataAlgorithm class
> 
> Hi Chiang
> 
> Happy new year to you too.
> 
> I'd go by example. Have a look at vtkClipPolyData.cxx, which derives from
> vtkPolyDataAlgorithm. In essence, only vtkPolyDataAlgorithm::RequestData()
> has to be overridden by the subclass, that's where all the functionality of
> an algorithm is supposed to go. 
> 
> The input and output data is contained in generic containers that are passed
> as function arguments.
> 
> 
> inputVector represents what you feed to the algorithm, typically by using
> vtkAlgorithm::SetInputConnection(), vtkAlgorithm::SetInputData(),
> vtkAlgorithm::GetOutputPort(), etc. You are supposed to access the data in
> the following way.
> 
> 
> You have the chance to notify the progress by calling
> vtkAlgorithm::UpdateProgress().
> You can check if the user requested the termination of an algorithm by
> checking the value of vtkAlgorithm::GetAbortExecute().
> 
> Besides that, make sure to first carefully read through the documentation of 
> vtkPolyDataAlgorithm
> <http://www.vtk.org/doc/nightly/html/classvtkPolyDataAlgorithm>   and 
> vtkAlgorithm <http://www.vtk.org/doc/nightly/html/classvtkAlgorithm.html>  .
> The implementation of the  vtkAlgorithm.cxx
> <https://github.com/Kitware/VTK/blob/master/Common/ExecutionModel/vtkAlgorithm.cxx>  
> and  vtkPolyDataAlgorithm.cxx
> <https://github.com/Kitware/VTK/blob/master/Common/ExecutionModel/vtkPolyDataAlgorithm.cxx>  
> may also serve as reference.
> 
> I hope this helped.
> Norman
> 
> 
> 
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