itkChainCodePath.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
 *
 *  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 itkChainCodePath_h
#define itkChainCodePath_h

#include "itkPath.h"
#include "itkOffset.h"
#include "itkObjectFactory.h"

#include <vector>

namespace itk
{
template< unsigned int VDimension >
class ITK_TEMPLATE_EXPORT ChainCodePath:public
  Path< unsigned int, Offset< VDimension >, VDimension >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(ChainCodePath);

  static constexpr unsigned int Dimension = VDimension;

  using Self = ChainCodePath< VDimension >;
  using Superclass = Path< unsigned int, Offset< VDimension >, VDimension >;

  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkTypeMacro(ChainCodePath, Path);

  using OutputType = typename Superclass::OutputType;
  using InputType = typename Superclass::InputType;

  using OffsetType = OutputType;
  using IndexType = Index< VDimension >;

  using ChainCodeType = std::vector< OffsetType >;

  using ChainCodeSizeType = typename ChainCodeType::size_type;

  // Functions inherited from Path

  OutputType Evaluate(const InputType & input) const override
  {
    return m_Chain[input];
  }

  IndexType EvaluateToIndex(const InputType & input) const override;

  OffsetType IncrementInput(InputType & input) const override;

  InputType EndOfInput() const override
  {
    return static_cast<InputType>(NumberOfSteps());  // 0 is before the first step, 1 is after it
  }

  itkNewMacro(Self);

  itkSetMacro(Start, IndexType);
  itkGetConstReferenceMacro(Start, IndexType);

  virtual inline void InsertStep(InputType position, OffsetType step)
  {
    m_Chain.insert(m_Chain.begin() + position, step);
    this->Modified();
  }

  virtual inline void ChangeStep(InputType position, OffsetType step)
  {
    m_Chain[position] = step;
    this->Modified();
  }

  virtual inline void Clear()
  {
    m_Chain.clear();
    this->Modified();
  }

  virtual inline ChainCodeSizeType NumberOfSteps() const
  {
    return m_Chain.size();
  }

  void Initialize() override
  {
    m_Start = this->GetZeroIndex();
    this->Clear();
  }

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

private:
  IndexType     m_Start;            // origin image index for the path
  ChainCodeType m_Chain;            // the chain code (vector of offsets)
};
} // end namespace itk

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

#endif