itkProgressReporter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkProgressReporter.h,v $
  Language:  C++
  Date:      $Date: 2003/09/10 14:29:23 $
  Version:   $Revision: 1.8 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/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 notices for more information.

=========================================================================*/
#ifndef _itkProgressReporter_h
#define _itkProgressReporter_h

#include "itkProcessObject.h"

namespace itk
{

class ITKCommon_EXPORT ProgressReporter
{
public:
  ProgressReporter(ProcessObject* filter, int threadId,
                   unsigned long numberOfPixels,
                   unsigned long numberOfUpdates = 100,
                   float initialProgress = 0.0f,
                   float progressWeight  = 1.0f );
  
  ~ProgressReporter();
  
  void CompletedPixel()
    {
    // Inline implementation for efficiency.
    // We don't need to test for thread id 0 here because the
    // constructor sets m_PixelsBeforeUpdate to a value larger than
    // the number of pixels for threads other than 0.
    if(--m_PixelsBeforeUpdate == 0)
      {
      m_PixelsBeforeUpdate = m_PixelsPerUpdate;
      m_CurrentPixel += m_PixelsPerUpdate;
      m_Filter->UpdateProgress(
          m_CurrentPixel * m_InverseNumberOfPixels * m_ProgressWeight + m_InitialProgress);
      if( m_Filter->GetAbortGenerateData() )
        {
        throw ProcessAborted();
        }
      }
    }

protected:
  ProcessObject* m_Filter;
  int m_ThreadId;
  float m_InverseNumberOfPixels;
  unsigned long m_CurrentPixel;
  unsigned long m_PixelsPerUpdate;
  unsigned long m_PixelsBeforeUpdate;
  float  m_InitialProgress;
  float  m_ProgressWeight;

private:
  ProgressReporter(); //purposely not implemented

};

} // end namespace itk

#endif

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