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

  Program:   Visualization Toolkit
  Module:    TestMetaIO.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.

=========================================================================*/
// .NAME Test of vtkMetaIO / MetaImage
// .SECTION Description
//

#include "vtkMetaImageReader.h"
#include "vtkMetaImageWriter.h"
#include "vtkOutputWindow.h"
#include "vtkObjectFactory.h"
#include "vtkDataObject.h"
#include "vtkImageData.h"
#include "vtkImageMathematics.h"


int TestMetaIO(int argc, char *argv[])
{
  vtkOutputWindow::GetInstance()->PromptUserOn();
  if ( argc <= 1 )
    {
    cout << "Usage: " << argv[0] << " <meta image file>" << endl;
    return 1;
    }


  vtkMetaImageReader *reader = vtkMetaImageReader::New();
  reader->SetFileName(argv[1]);
  reader->Update();
  cout << "10, 10, 10 : (1) : " 
       << reader->GetOutput()->GetScalarComponentAsFloat(10, 10, 10, 0)
       << endl;
  cout << "24, 37, 10 : (168) : " 
       << reader->GetOutput()->GetScalarComponentAsFloat(24, 37, 10, 0)
       << endl;

  vtkMetaImageWriter *writer = vtkMetaImageWriter::New();
  writer->SetFileName("TestMetaIO.mha");
  writer->SetInputConnection(reader->GetOutputPort());
  writer->Write();

  reader->Delete();
  writer->Delete();

  vtkMetaImageReader *readerStd = vtkMetaImageReader::New();
  readerStd->SetFileName(argv[1]);
  readerStd->Update();

  vtkMetaImageReader *readerNew = vtkMetaImageReader::New();
  readerNew->SetFileName("TestMetaIO.mha");
  readerNew->Update();

  double error = 0;
  int * ext = readerStd->GetOutput()->GetWholeExtent();
  for(int z=ext[4]; z<=ext[5]; z+=2)
    {
    for(int y=ext[2]; y<=ext[3]; y++)
      {
      for(int x=ext[0]; x<=ext[1]; x++)
        {
        error += fabs( 
                  readerStd->GetOutput()->GetScalarComponentAsFloat(x, y, z, 0)
                  -
                  readerNew->GetOutput()->GetScalarComponentAsFloat(x, y, z, 0)
                  );
        }
      }
    }

  readerStd->Delete();
  readerNew->Delete();

  if(error > 1)
    {
    cerr << "Error: Image difference on read/write = " << error << endl;
    return 1;
    }

  cout << "Success!  Error = " << error << endl;

  return 0;
}