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/*=========================================================================
Program: Visualization Toolkit
Module: vtkTensor.h
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 vtkTensor - supporting class to enable assignment and referencing of tensors
// .SECTION Description
// vtkTensor is a floating point representation of an nxn tensor. vtkTensor
// provides methods for assignment and reference of tensor components. It
// does it in such a way as to minimize data copying.
//
// .SECTION Caveats
// vtkTensor performs its operations using pointer reference. You are
// responsible for supplying data storage (if necessary) if local copies
// of data are being made.
#ifndef __vtkTensor_h
#define __vtkTensor_h
#include "vtkObject.h"
class VTK_COMMON_EXPORT vtkTensor : public vtkObject
{
public:
static vtkTensor *New();
vtkTypeMacro(vtkTensor,vtkObject);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Initialize tensor components to 0.0.
void Initialize();
// Description:
// Get the tensor component (i,j).
double GetComponent(int i, int j) {return this->T[i+3*j];};
// Description:
// Set the value of the tensor component (i,j).
void SetComponent(int i, int j, double 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;};
// Description:
// Add to the value of the tensor component at location (i,j).
void AddComponent(int i, int j, double 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;};
// Description:
// Return column vector from tensor. (Assumes 2D matrix form and 0-offset.)
double *GetColumn(int j) { if (j > 2) {vtkErrorMacro("trying to get tensor column j > 2: j = " << j); return NULL;}; return this->T + 3*j;};
// Description:
// Deep copy of one tensor to another tensor.
void DeepCopy(vtkTensor *t);
// Description:
// Provide double * type conversion.
operator double*() {return this->T;};
// Description:
// Data member left public for efficiency.
double *T;
protected:
vtkTensor();
~vtkTensor() {};
double 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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