vtkSphericalDirectionEncoder.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkSphericalDirectionEncoder.h,v $

  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.

=========================================================================*/
#ifndef __vtkSphericalDirectionEncoder_h
#define __vtkSphericalDirectionEncoder_h

#include "vtkDirectionEncoder.h"

class VTK_VOLUMERENDERING_EXPORT vtkSphericalDirectionEncoder : public vtkDirectionEncoder
{
public:
  vtkTypeRevisionMacro(vtkSphericalDirectionEncoder,vtkDirectionEncoder);
  void PrintSelf( ostream& os, vtkIndent indent );

  static vtkSphericalDirectionEncoder *New();


  int GetEncodedDirection( float n[3] );
  
  float *GetDecodedGradient( int value );

  int GetNumberOfEncodedDirections( void ) { return 65536; }


  float *GetDecodedGradientTable( void ) 
    {
      return &(this->DecodedGradientTable[0]);
    }
  
  
protected:
  vtkSphericalDirectionEncoder();
  ~vtkSphericalDirectionEncoder();

  static float DecodedGradientTable[65536*3];


  static void InitializeDecodedGradientTable();
  static int DecodedGradientTableInitialized;
  
private:
  vtkSphericalDirectionEncoder(const vtkSphericalDirectionEncoder&);  // Not implemented.
  void operator=(const vtkSphericalDirectionEncoder&);  // Not implemented.
}; 


#endif

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