---

Common/vtkTensor.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkTensor.h,v $
  Language:  C++

  Copyright (c) 1993-2002 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 __vtkTensor_h
#define __vtkTensor_h

#include "vtkObject.h"

class VTK_COMMON_EXPORT vtkTensor : public vtkObject
{
public:
  static vtkTensor *New();
  vtkTypeRevisionMacro(vtkTensor,vtkObject);

  void Initialize();

  float GetComponent(int i, int j) {return this->T[i+3*j];};


  void SetComponent(int i, int j, float v) {if (i > 2 || j > 2) {vtkErrorMacro("trying to set tensor component i or j > 2: i = " << i << ", j = " << j); return;}; this->T[i+3*j] = v;};


  void AddComponent(int i, int j, float v) { if (i > 2 || j > 2) {vtkErrorMacro("trying to add tensor component i or j > 2: i = " << i << ", j = " << j); return;}; this->T[i+3*j] += v;};


  float *GetColumn(int j) { if (j > 2) {vtkErrorMacro("trying to get tensor column j > 2: j = " << j); return NULL;}; return this->T + 3*j;};

  void DeepCopy(vtkTensor *t);

  operator float*() {return this->T;};

  float *T;
  
protected: 
  vtkTensor();
  ~vtkTensor() {};

  float Storage[9];
private:
  vtkTensor(const vtkTensor&);  // Not implemented.
  void operator=(const vtkTensor&);  // Not implemented.
};

inline void vtkTensor::Initialize()
{
  for (int j=0; j<3; j++)
    {
    for (int i=0; i<3; i++)
      {
      this->T[i+j*3] = 0.0;
      }
    }
}

inline void vtkTensor::DeepCopy(vtkTensor *t)
{
  for (int j=0; j < 3; j++)
    {
    for (int i=0; i < 3; i++)
      {
      this->T[i+3*j] = t->T[i+3*j];
      }
    }
}

#endif

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