itkQuadricDecimationQuadEdgeMeshFilter.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 itkQuadricDecimationQuadEdgeMeshFilter_h
#define itkQuadricDecimationQuadEdgeMeshFilter_h

#include "itkEdgeDecimationQuadEdgeMeshFilter.h"
#include "itkQuadEdgeMeshDecimationQuadricElementHelper.h"

namespace itk
{
template< typename TInput, typename TOutput, typename TCriterion >
class ITK_TEMPLATE_EXPORT QuadricDecimationQuadEdgeMeshFilter:
  public EdgeDecimationQuadEdgeMeshFilter< TInput, TOutput, TCriterion >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(QuadricDecimationQuadEdgeMeshFilter);

  using Self = QuadricDecimationQuadEdgeMeshFilter;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;
  using Superclass = EdgeDecimationQuadEdgeMeshFilter<
    TInput, TOutput, TCriterion >;

  itkTypeMacro(QuadricDecimationQuadEdgeMeshFilter, EdgeDecimationQuadEdgeMeshFilter);

  itkNewMacro(Self);

  using InputMeshType = TInput;
  using InputMeshPointer = typename InputMeshType::Pointer;

  using OutputMeshType = TOutput;
  using OutputMeshPointer = typename OutputMeshType::Pointer;
  using OutputPointIdentifier = typename OutputMeshType::PointIdentifier;
  using OutputPointType = typename OutputMeshType::PointType;
  using OutputCoordType = typename OutputPointType::CoordRepType;
  using OutputQEType = typename OutputMeshType::QEType;
  using OutputEdgeCellType = typename OutputMeshType::EdgeCellType;
  using OutputCellsContainerIterator = typename OutputMeshType::CellsContainerIterator;
  using OutputPointsContainerPointer = typename OutputMeshType::PointsContainerPointer;
  using OutputPointsContainerIterator = typename OutputMeshType::PointsContainerIterator;

  static constexpr unsigned int OutputPointDimension = OutputMeshType::PointDimension;

  using CriterionType = TCriterion;
  using MeasureType = typename CriterionType::MeasureType;

  using PriorityType = typename Superclass::PriorityType;
  using PriorityQueueItemType = typename Superclass::PriorityQueueItemType;
  using PriorityQueueType = typename Superclass::PriorityQueueType;
  using PriorityQueuePointer = typename Superclass::PriorityQueuePointer;

  using QueueMapType = typename Superclass::QueueMapType;
  using QueueMapIterator = typename Superclass::QueueMapIterator;

  using OperatorType = typename Superclass::OperatorType;
  using OperatorPointer = typename Superclass::OperatorPointer;

  using QuadricElementType = QuadEdgeMeshDecimationQuadricElementHelper<OutputPointType>;

  using QuadricElementMapType =
      std::map< OutputPointIdentifier, QuadricElementType >;

  using QuadricElementMapIterator = typename QuadricElementMapType::iterator;

protected:
  QuadricDecimationQuadEdgeMeshFilter() = default;

  ~QuadricDecimationQuadEdgeMeshFilter() override = default;

  inline void QuadricAtOrigin(OutputQEType *iEdge, QuadricElementType & oQ, OutputMeshType *outputMesh)
  {
    OutputPointIdentifier id[3];

    id[0] = iEdge->GetOrigin();
    id[1] = iEdge->GetDestination();
    id[2] = iEdge->GetOnext()->GetDestination();

    OutputPointType p[3];

    for ( int i = 0; i < 3; i++ )
      {
      p[i] = outputMesh->GetPoint(id[i]);
      }

    oQ.AddTriangle(p[0], p[1], p[2]);
  }

  MeasureType MeasureEdge(OutputQEType *iEdge) override
  {
    OutputPointIdentifier id_org = iEdge->GetOrigin();
    OutputPointIdentifier id_dest = iEdge->GetDestination();
    QuadricElementType    Q = m_Quadric[id_org] + m_Quadric[id_dest];

    OutputPointType org = this->m_OutputMesh->GetPoint(id_org);
    OutputPointType dest = this->m_OutputMesh->GetPoint(id_dest);

    OutputPointType mid;

    mid.SetToMidPoint(org, dest);
    OutputPointType p = Q.ComputeOptimalLocation(mid);

    return static_cast< MeasureType >( Q.ComputeError(p) );
  }

  void DeletePoint(const OutputPointIdentifier & iIdToBeDeleted,
                           const OutputPointIdentifier & iRemaining) override;

  OutputPointType Relocate(OutputQEType *iEdge) override;

  void Initialize() override;

private:
  QuadricElementMapType m_Quadric;
};
}
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkQuadricDecimationQuadEdgeMeshFilter.hxx"
#endif
#endif