vtkImageTranslateExtent.cxx

/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkImageTranslateExtent.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "vtkImageTranslateExtent.h"

#include "vtkImageData.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkPointData.h"

vtkStandardNewMacro(vtkImageTranslateExtent);

//----------------------------------------------------------------------------
vtkImageTranslateExtent::vtkImageTranslateExtent()
{
  int idx;

  for (idx = 0; idx < 3; ++idx)
    {
    this->Translation[idx]  = 0;
    }
}

//----------------------------------------------------------------------------
void vtkImageTranslateExtent::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);

  os << indent << "Translation: (" << this->Translation[0]
     << "," << this->Translation[1] << "," << this->Translation[2] << endl;
}

//----------------------------------------------------------------------------
// Change the WholeExtent
int vtkImageTranslateExtent::RequestInformation (
  vtkInformation * vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  // get the info objects
  vtkInformation* outInfo = outputVector->GetInformationObject(0);
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);

  int idx, extent[6];
  double spacing[3], origin[3];

  inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),extent);
  inInfo->Get(vtkDataObject::ORIGIN(), origin);
  inInfo->Get(vtkDataObject::SPACING(), spacing);

  // TranslateExtent the OutputWholeExtent with the input WholeExtent
  for (idx = 0; idx < 3; ++idx)
    {
    // change extent
    extent[2*idx] += this->Translation[idx];
    extent[2*idx+1] += this->Translation[idx];
    // change origin so the data does not shift
    origin[idx] -= static_cast<double>(this->Translation[idx]) * spacing[idx];
    }

  outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),extent,6);
  outInfo->Set(vtkDataObject::ORIGIN(),origin,3);

  return 1;
}

//----------------------------------------------------------------------------
// This method simply copies by reference the input data to the output.
int vtkImageTranslateExtent::RequestData(
  vtkInformation *vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation *outInfo = outputVector->GetInformationObject(0);

  vtkImageData *inData = vtkImageData::SafeDownCast(
    inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkImageData *outData = vtkImageData::SafeDownCast(
    outInfo->Get(vtkDataObject::DATA_OBJECT()));
  int extent[6];

  // since inData can be larger than update extent.
  inData->GetExtent(extent);
  for (int i = 0; i < 3; ++i)
    {
    extent[i*2] += this->Translation[i];
    extent[i*2+1] += this->Translation[i];
    }
  outData->SetExtent(extent);
  outData->GetPointData()->PassData(inData->GetPointData());

  return 1;
}

//----------------------------------------------------------------------------
int vtkImageTranslateExtent::RequestUpdateExtent (
  vtkInformation * vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  // get the info objects
  vtkInformation* outInfo = outputVector->GetInformationObject(0);
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);

  int inExtent[6], extent[6];
  outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(), inExtent);

  extent[0] = inExtent[0] - this->Translation[0];
  extent[1] = inExtent[1] - this->Translation[0];
  extent[2] = inExtent[2] - this->Translation[1];
  extent[3] = inExtent[3] - this->Translation[1];
  extent[4] = inExtent[4] - this->Translation[2];
  extent[5] = inExtent[5] - this->Translation[2];

  inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(), extent, 6);

  return 1;
}