otbAffineFunctor.h

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/*
 * Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
 *
 * This file is part of Orfeo Toolbox
 *
 *     https://www.orfeo-toolbox.org/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
 
#ifndef otbAffineFunctor_h
#define otbAffineFunctor_h
 
namespace otb
{
namespace Functor
{
template <class TInput, class TOutput, class TScale = double>
class AffineFunctor
{
public:
  AffineFunctor() : m_A(0.), m_B(0.)
  {
  }
 
  virtual ~AffineFunctor()
  {
  }
 
  void SetA(TScale value)
  {
    m_A = value;
  }
  TScale GetA()
  {
    return m_A;
  }
  void SetB(TOutput value)
  {
    m_B = value;
  }
  TOutput GetB()
  {
    return m_B;
  }
 
  bool operator!=(const AffineFunctor& other) const
  {
    return ((m_A != other.GetA()) || (m_B != other.GetB()));
  }
 
  bool operator==(const AffineFunctor& other) const
  {
    return ((m_A == other.GetA()) && (m_B == other.GetB()));
  }
 
  // main computation method
  inline TOutput operator()(const TInput& x) const
  {
    return (m_B + static_cast<TOutput>(m_A * x));
  }
 
private:
  TScale  m_A;
  TOutput m_B;
};
} // End namespace Functor
} // End namespace otb
 
#endif