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

  Program:   Visualization Toolkit
  Module:    vtkVectorOperators.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.

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

#ifndef vtkVectorOperators_h
#define vtkVectorOperators_h

// This set of operators enhance the vtkVector classes, allowing various
// operator overloads one might expect.
#include "vtkVector.h"

// Description:
// Unary minus / negation of vector.
template <typename A, int Size>
vtkVector<A, Size> operator-(const vtkVector<A, Size>& v)
{
  vtkVector<A, Size> ret;
  for (int i = 0; i < Size; ++i)
  {
    ret[i] = -v[i];
  }
  return ret;
}

// Description:
// Performs addition of vectors of the same basic type.
template <typename A, int Size>
vtkVector<A, Size> operator+(const vtkVector<A, Size>& v1, const vtkVector<A, Size>& v2)
{
  vtkVector<A, Size> ret;
  for (int i = 0; i < Size; ++i)
  {
    ret[i] = v1[i] + v2[i];
  }
  return ret;
}

// Description:
// Add the vector b to the vector a of the same basic type.
template <typename T, int Size>
vtkVector<T, Size>& operator+=(vtkVector<T, Size>& a, const vtkVector<T, Size>& b)
{
  for (int dim = 0; dim < Size; ++dim)
  {
    a[dim] += b[dim];
  }

  return a;
}

// Description:
// Performs subtraction of vectors of the same basic type.
template <typename A, int Size>
vtkVector<A, Size> operator-(const vtkVector<A, Size>& v1, const vtkVector<A, Size>& v2)
{
  vtkVector<A, Size> ret;
  for (int i = 0; i < Size; ++i)
  {
    ret[i] = v1[i] - v2[i];
  }
  return ret;
}

// Description:
// Substract the vector b to the vector a of the same basic type.
template <typename T, int Size>
vtkVector<T, Size>& operator-=(vtkVector<T, Size>& a, const vtkVector<T, Size>& b)
{
  for (int dim = 0; dim < Size; ++dim)
  {
    a[dim] -= b[dim];
  }

  return a;
}

// Description:
// Performs multiplication of vectors of the same basic type.
template <typename A, int Size>
vtkVector<A, Size> operator*(const vtkVector<A, Size>& v1, const vtkVector<A, Size>& v2)
{
  vtkVector<A, Size> ret;
  for (int i = 0; i < Size; ++i)
  {
    ret[i] = v1[i] * v2[i];
  }
  return ret;
}

// Description:
// Performs multiplication of vectors by a scalar value.
template <typename A, typename B, int Size>
vtkVector<A, Size> operator*(const vtkVector<A, Size>& v1, const B& scalar)
{
  vtkVector<A, Size> ret;
  for (int i = 0; i < Size; ++i)
  {
    ret[i] = v1[i] * scalar;
  }
  return ret;
}

// Description:
// Performs divisiom of vectors of the same type.
template <typename A, int Size>
vtkVector<A, Size> operator/(const vtkVector<A, Size>& v1, const vtkVector<A, Size>& v2)
{
  vtkVector<A, Size> ret;
  for (int i = 0; i < Size; ++i)
  {
    ret[i] = v1[i] / v2[i];
  }
  return ret;
}

// Description:
// Several macros to define the various operator overloads for the vectors.
#define vtkVectorOperatorNegate(vectorType, type, size)                                            \
  inline vectorType operator-(const vectorType& v)                                                 \
  {                                                                                                \
    return vectorType((-static_cast<vtkVector<type, size>>(v)).GetData());                         \
  }
#define vtkVectorOperatorPlus(vectorType, type, size)                                              \
  inline vectorType operator+(const vectorType& v1, const vectorType& v2)                          \
  {                                                                                                \
    return vectorType(                                                                             \
      (static_cast<vtkVector<type, size>>(v1) + static_cast<vtkVector<type, size>>(v2))            \
        .GetData());                                                                               \
  }
#define vtkVectorOperatorMinus(vectorType, type, size)                                             \
  inline vectorType operator-(const vectorType& v1, const vectorType& v2)                          \
  {                                                                                                \
    return vectorType(                                                                             \
      (static_cast<vtkVector<type, size>>(v1) - static_cast<vtkVector<type, size>>(v2))            \
        .GetData());                                                                               \
  }
#define vtkVectorOperatorMultiply(vectorType, type, size)                                          \
  inline vectorType operator*(const vectorType& v1, const vectorType& v2)                          \
  {                                                                                                \
    return vectorType(                                                                             \
      (static_cast<vtkVector<type, size>>(v1) * static_cast<vtkVector<type, size>>(v2))            \
        .GetData());                                                                               \
  }
#define vtkVectorOperatorMultiplyScalar(vectorType, type, size)                                    \
  template <typename B>                                                                            \
  inline vectorType operator*(const vectorType& v1, const B& scalar)                               \
  {                                                                                                \
    return vectorType((static_cast<vtkVector<type, size>>(v1) * scalar).GetData());                \
  }
#define vtkVectorOperatorMultiplyScalarPre(vectorType, type, size)                                 \
  template <typename B>                                                                            \
  inline vectorType operator*(const B& scalar, const vectorType& v1)                               \
  {                                                                                                \
    return vectorType((static_cast<vtkVector<type, size>>(v1) * scalar).GetData());                \
  }
#define vtkVectorOperatorDivide(vectorType, type, size)                                            \
  inline vectorType operator/(const vectorType& v1, const vectorType& v2)                          \
  {                                                                                                \
    return vectorType(                                                                             \
      (static_cast<vtkVector<type, size>>(v1) / static_cast<vtkVector<type, size>>(v2))            \
        .GetData());                                                                               \
  }

#define vtkVectorOperatorMacro(vectorType, type, size)                                             \
  vtkVectorOperatorNegate(vectorType, type, size);                                                 \
  vtkVectorOperatorPlus(vectorType, type, size);                                                   \
  vtkVectorOperatorMinus(vectorType, type, size);                                                  \
  vtkVectorOperatorMultiply(vectorType, type, size);                                               \
  vtkVectorOperatorMultiplyScalar(vectorType, type, size);                                         \
  vtkVectorOperatorMultiplyScalarPre(vectorType, type, size);                                      \
  vtkVectorOperatorDivide(vectorType, type, size)

// Description:
// Overload the operators for the common types.
vtkVectorOperatorMacro(vtkVector2i, int, 2);
vtkVectorOperatorMacro(vtkVector2f, float, 2);
vtkVectorOperatorMacro(vtkVector2d, double, 2);
vtkVectorOperatorMacro(vtkVector3i, int, 3);
vtkVectorOperatorMacro(vtkVector3f, float, 3);
vtkVectorOperatorMacro(vtkVector3d, double, 3);

#endif
// VTK-HeaderTest-Exclude: vtkVectorOperators.h
