itkTranslationTransform.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  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 itkTranslationTransform_h
#define itkTranslationTransform_h
 
#include "itkTransform.h"
#include "itkMacro.h"
#include "itkMatrix.h"
 
namespace itk
{
 
template <typename TParametersValueType = double, unsigned int VDimension = 3>
class ITK_TEMPLATE_EXPORT TranslationTransform : public Transform<TParametersValueType, VDimension, VDimension>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(TranslationTransform);
 
  using Self = TranslationTransform;
  using Superclass = Transform<TParametersValueType, VDimension, VDimension>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  itkNewMacro(Self);
 
  itkOverrideGetNameOfClassMacro(TranslationTransform);
 
  static constexpr unsigned int SpaceDimension = VDimension;
  static constexpr unsigned int ParametersDimension = VDimension;
 
  using typename Superclass::ScalarType;
 
  using typename Superclass::FixedParametersType;
  using typename Superclass::ParametersType;
 
  using typename Superclass::JacobianType;
  using typename Superclass::JacobianPositionType;
  using typename Superclass::InverseJacobianPositionType;
 
  using typename Superclass::NumberOfParametersType;
 
  using InputVectorType = Vector<TParametersValueType, VDimension>;
  using OutputVectorType = Vector<TParametersValueType, VDimension>;
 
  using InputCovariantVectorType = CovariantVector<TParametersValueType, VDimension>;
  using OutputCovariantVectorType = CovariantVector<TParametersValueType, VDimension>;
 
  using InputVnlVectorType = vnl_vector_fixed<TParametersValueType, VDimension>;
  using OutputVnlVectorType = vnl_vector_fixed<TParametersValueType, VDimension>;
 
  using InputPointType = Point<TParametersValueType, VDimension>;
  using OutputPointType = Point<TParametersValueType, VDimension>;
 
  using InverseTransformBaseType = typename Superclass::InverseTransformBaseType;
  using InverseTransformBasePointer = typename InverseTransformBaseType::Pointer;
 
  using typename Superclass::TransformCategoryEnum;
 
  const OutputVectorType &
  GetOffset() const
  {
    return m_Offset;
  }
 
  void
  SetParameters(const ParametersType & parameters) override;
 
  const ParametersType &
  GetParameters() const override;
 
  void
  SetOffset(const OutputVectorType & offset)
  {
    m_Offset = offset;
    return;
  }
 
  void
  Compose(const Self * other, bool pre = false);
 
  void
  Translate(const OutputVectorType & offset, bool pre = false);
 
  OutputPointType
  TransformPoint(const InputPointType & point) const override;
 
  using Superclass::TransformVector;
  OutputVectorType
  TransformVector(const InputVectorType & vect) const override;
 
  OutputVnlVectorType
  TransformVector(const InputVnlVectorType & vect) const override;
 
  using Superclass::TransformCovariantVector;
  OutputCovariantVectorType
  TransformCovariantVector(const InputCovariantVectorType & vect) const override;
 
  inline InputPointType
  BackTransform(const OutputPointType & point) const;
 
  inline InputVectorType
  BackTransform(const OutputVectorType & vect) const;
 
  inline InputVnlVectorType
  BackTransform(const OutputVnlVectorType & vect) const;
 
  inline InputCovariantVectorType
  BackTransform(const OutputCovariantVectorType & vect) const;
 
  bool
  GetInverse(Self * inverse) const;
 
  InverseTransformBasePointer
  GetInverseTransform() const override;
 
  void
  ComputeJacobianWithRespectToParameters(const InputPointType & point, JacobianType & jacobian) const override;
 
 
  void
  ComputeJacobianWithRespectToPosition(const InputPointType & x, JacobianPositionType & jac) const override;
  using Superclass::ComputeJacobianWithRespectToPosition;
 
  void
  SetIdentity();
 
  NumberOfParametersType
  GetNumberOfParameters() const override
  {
    return VDimension;
  }
 
  bool
  IsLinear() const override
  {
    return true;
  }
 
  TransformCategoryEnum
  GetTransformCategory() const override
  {
    return Self::TransformCategoryEnum::Linear;
  }
 
  void
  SetFixedParameters(const FixedParametersType &) override
  {}
 
  const FixedParametersType &
  GetFixedParameters() const override
  {
    this->m_FixedParameters.SetSize(0);
    return this->m_FixedParameters;
  }
protected:
  TranslationTransform();
  ~TranslationTransform() override = default;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
private:
  JacobianType     m_IdentityJacobian{};
  OutputVectorType m_Offset{}; // Offset of the transformation
};                             // class TranslationTransform
 
// Back transform a point
template <typename TParametersValueType, unsigned int VDimension>
inline auto
TranslationTransform<TParametersValueType, VDimension>::BackTransform(const OutputPointType & point) const
  -> InputPointType
{
  return point - m_Offset;
}
 
// Back transform a vector
template <typename TParametersValueType, unsigned int VDimension>
inline auto
TranslationTransform<TParametersValueType, VDimension>::BackTransform(const OutputVectorType & vect) const
  -> InputVectorType
{
  return vect;
}
 
// Back transform a vnl_vector
template <typename TParametersValueType, unsigned int VDimension>
inline auto
TranslationTransform<TParametersValueType, VDimension>::BackTransform(const OutputVnlVectorType & vect) const
  -> InputVnlVectorType
{
  return vect;
}
 
// Back Transform a CovariantVector
template <typename TParametersValueType, unsigned int VDimension>
inline auto
TranslationTransform<TParametersValueType, VDimension>::BackTransform(const OutputCovariantVectorType & vect) const
  -> InputCovariantVectorType
{
  return vect;
}
 
} // namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkTranslationTransform.hxx"
#endif
 
#endif /* itkTranslationTransform_h */