itkConstantVelocityFieldTransform.h

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 *  Copyright Insight Software Consortium
 *
 *  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.txt
 *
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 *  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.
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 *=========================================================================*/
#ifndef itkConstantVelocityFieldTransform_h
#define itkConstantVelocityFieldTransform_h

#include "itkDisplacementFieldTransform.h"

namespace itk
{

template
<typename TParametersValueType, unsigned int NDimensions>
class ITK_TEMPLATE_EXPORT ConstantVelocityFieldTransform :
  public DisplacementFieldTransform<TParametersValueType, NDimensions>
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(ConstantVelocityFieldTransform);

  using Self = ConstantVelocityFieldTransform;
  using Superclass = DisplacementFieldTransform<TParametersValueType, NDimensions>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkTypeMacro( ConstantVelocityFieldTransform, DisplacementFieldTransform );

  itkNewMacro( Self );

  using InverseTransformBasePointer = typename Superclass:: InverseTransformBasePointer;

  using ScalarType = typename Superclass::ScalarType;

  using FixedParametersType = typename Superclass::FixedParametersType;
  using FixedParametersValueType = typename Superclass::FixedParametersValueType;
  using ParametersType = typename Superclass::ParametersType;
  using ParametersValueType = typename Superclass::ParametersValueType;

  using TransformCategoryType = typename Superclass::TransformCategoryType;

  using NumberOfParametersType = typename Superclass::NumberOfParametersType;

  using InputPointType = typename Superclass::InputPointType;
  using OutputPointType = typename Superclass::OutputPointType;

  using InputVectorType = typename Superclass::InputVectorType;
  using OutputVectorType = typename Superclass::OutputVectorType;

  using InputVectorPixelType = typename Superclass::InputVectorPixelType;
  using OutputVectorPixelType = typename Superclass::OutputVectorPixelType;

  using DerivativeType = typename Superclass::DerivativeType;

  static constexpr unsigned int ConstantVelocityFieldDimension = NDimensions;

  static constexpr unsigned int Dimension = NDimensions;

  using DisplacementFieldType = typename Superclass::DisplacementFieldType;
  using DisplacementFieldPointer = typename DisplacementFieldType::Pointer;

  using ConstantVelocityFieldType = Image<OutputVectorType, ConstantVelocityFieldDimension>;
  using ConstantVelocityFieldPointer = typename ConstantVelocityFieldType::Pointer;

  using IndexType = typename ConstantVelocityFieldType::IndexType;
  using RegionType = typename ConstantVelocityFieldType::RegionType;
  using SizeType = typename ConstantVelocityFieldType::SizeType;
  using SpacingType = typename ConstantVelocityFieldType::SpacingType;
  using DirectionType = typename ConstantVelocityFieldType::DirectionType;
  using PointType = typename ConstantVelocityFieldType::PointType;
  using PixelType = typename ConstantVelocityFieldType::PixelType;

  using VelocityFieldType = ConstantVelocityFieldType;

  using ConstantVelocityFieldInterpolatorType =
      VectorInterpolateImageFunction<ConstantVelocityFieldType, ScalarType>;
  using ConstantVelocityFieldInterpolatorPointer = typename ConstantVelocityFieldInterpolatorType::Pointer;

  using OptimizerParametersHelperType =
      ImageVectorOptimizerParametersHelper<ScalarType, Dimension, ConstantVelocityFieldDimension>;

  virtual void SetConstantVelocityField( ConstantVelocityFieldType * );
  itkGetModifiableObjectMacro(ConstantVelocityField, ConstantVelocityFieldType );

  void SetFixedParameters( const FixedParametersType & ) override;

  virtual void SetConstantVelocityFieldInterpolator( ConstantVelocityFieldInterpolatorType * );
  itkGetModifiableObjectMacro(ConstantVelocityFieldInterpolator, ConstantVelocityFieldInterpolatorType );

  itkGetConstReferenceMacro( ConstantVelocityFieldSetTime, ModifiedTimeType );

  void UpdateTransformParameters( const DerivativeType & update, ScalarType factor = 1.0 ) override;

  bool GetInverse( Self *inverse ) const;

  InverseTransformBasePointer GetInverseTransform() const override;

  virtual void IntegrateVelocityField();

  // Set/get compute number of exp. integration steps automatically
  itkSetMacro( CalculateNumberOfIntegrationStepsAutomatically, bool );
  itkGetConstMacro( CalculateNumberOfIntegrationStepsAutomatically, bool );
  itkBooleanMacro( CalculateNumberOfIntegrationStepsAutomatically );

  itkSetClampMacro( LowerTimeBound, ScalarType, 0, 1 );

  itkGetConstMacro( LowerTimeBound, ScalarType );

  itkSetClampMacro( UpperTimeBound, ScalarType, 0, 1 );

  itkGetConstMacro( UpperTimeBound, ScalarType );

  itkSetMacro( NumberOfIntegrationSteps, unsigned int );

  itkGetConstMacro( NumberOfIntegrationSteps, unsigned int );

protected:

  ConstantVelocityFieldTransform();
  ~ConstantVelocityFieldTransform() override = default;
  void PrintSelf( std::ostream& os, Indent indent ) const override;

  typename LightObject::Pointer InternalClone() const override;

  typename DisplacementFieldType::Pointer CopyDisplacementField( const DisplacementFieldType * ) const;

  ConstantVelocityFieldPointer              m_ConstantVelocityField;

  bool                                      m_CalculateNumberOfIntegrationStepsAutomatically{ false };

  ConstantVelocityFieldInterpolatorPointer  m_ConstantVelocityFieldInterpolator;

  ModifiedTimeType m_ConstantVelocityFieldSetTime{ 0 };

  ScalarType                                m_LowerTimeBound;
  ScalarType                                m_UpperTimeBound;

  unsigned int                              m_NumberOfIntegrationSteps;

private:
  virtual void SetFixedParametersFromConstantVelocityField() const;

};

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkConstantVelocityFieldTransform.hxx"
#endif

#endif // itkConstantVelocityFieldTransform_h