sitkCompositeTransform.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
 *
 *         http://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 sitkCompositeTransform_h
#define sitkCompositeTransform_h
 
#include "sitkCommon.h"
#include "sitkTransform.h"
 
namespace itk
{
 
 
template <typename TParametersValueType, unsigned int NInputDimensions, unsigned int NOutputDimensions>
class Transform;
 
namespace simple
{

class SITKCommon_EXPORT CompositeTransform : public Transform
{
public:
  using Self = CompositeTransform;
  using Superclass = Transform;

  explicit CompositeTransform(unsigned int dimensions);

  CompositeTransform(const Transform &);

  CompositeTransform(const CompositeTransform &);

  explicit CompositeTransform(const std::vector<itk::simple::Transform> &);
 
  ~CompositeTransform() override;
 
  CompositeTransform &
  operator=(const CompositeTransform &);

  std::string
  GetName() const override
  {
    return std::string("CompositeTransform");
  }
 

  SITK_RETURN_SELF_TYPE_HEADER
  FlattenTransform();

  SITK_RETURN_SELF_TYPE_HEADER
  AddTransform(Transform t);

  unsigned int
  GetNumberOfTransforms() const;

  void
  ClearTransforms();

  void
  RemoveTransform();

  Transform
  GetBackTransform();

  Transform
  GetNthTransform(unsigned int n);
 
protected:
  void
  SetPimpleTransform(std::unique_ptr<PimpleTransformBase> &&) override;
 
private:
  struct MyVisitor
  {
    itk::TransformBase * transform;
    CompositeTransform * that;
    template <typename TransformType>
    void
    operator()()
    {
      TransformType * t = dynamic_cast<TransformType *>(transform);
      if (t)
      {
        that->InternalInitialization(t);
        // set to null to stop trying dynamic_cast
        transform = nullptr;
      }
    }
  };
 
  void
  InternalInitialization(itk::TransformBase * transform);
 
  template <unsigned int NDimension>
  void
  InternalInitialization(itk::CompositeTransform<double, NDimension> *);
 
  template <unsigned int NDimensions>
  void
  InternalInitialization(itk::Transform<double, NDimensions, NDimensions> *);
 
  std::function<void()>                  m_pfFlattenTransform;
  std::function<void(Transform &)>       m_pfAddTransform;
  std::function<void()>                  m_pfRemoveTransform;
  std::function<Transform()>             m_pfBackTransform;
  std::function<Transform(unsigned int)> m_pfGetNthTransform;
  std::function<unsigned int()>          m_pfGetNumberOfTransforms;
  std::function<void()>                  m_pfClearTransformQueue;
};
 
} // namespace simple
} // namespace itk
 
#endif // sitkCompositeTransform_h