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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 itkQuadEdgeMeshEulerOperatorJoinVertexFunction_h
#define itkQuadEdgeMeshEulerOperatorJoinVertexFunction_h
#include "itkQuadEdgeMeshFunctionBase.h"
#include <stack>
namespace itk
{
/**
* \class QuadEdgeMeshEulerOperatorJoinVertexFunction
*
* \brief Collapse a given edge by joining its dest and its org.
*
* Collapse the argument edge e of Evaluate
* by joining the two vertices incident to e (i.e. its endpoints).
* The destination vertex of e is set aside (i.e. disconnected from its
* edge entry and no edge has this vertex as endpoint). Note that the
* vertex itself is not removed from the container (and hence there is no
* loss of geometrical information). On success JoinVertex returns the Id
* of the disconnected vertex (i.e. the destination of e) and it is up to
* the caller to "take care" of it.
*
* Precondition: the edge should be adjacent at least to an other edge
* (i.e. not be isolated at both endpoints).
*
* \warning JoinVertex.Evaluate( h) and JoinVertex.Evaluate( h->GetSym() )
* are topologically identical. But their differ in their geometrical
* result, since JoinVertex removes the destination vertex of the
* incoming argument. A simple way to visualize this difference is to
* imagine a mesh constituted of squares laid out on a regular grid
* and for each such square an added diagonal. No imagine what happens
* when one operates JoinVertex on a diagonal edge of a corner square
* (and how it differs with feeding JoinVertex with the opposite edge).
*
* \ingroup QEMeshModifierFunctions
* \ingroup ITKQuadEdgeMesh
*/
template <typename TMesh, typename TQEType>
class ITK_TEMPLATE_EXPORT QuadEdgeMeshEulerOperatorJoinVertexFunction
: public QuadEdgeMeshFunctionBase<TMesh, TQEType *>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(QuadEdgeMeshEulerOperatorJoinVertexFunction);
/** Standard class type aliases. */
using Self = QuadEdgeMeshEulerOperatorJoinVertexFunction;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
using Superclass = QuadEdgeMeshFunctionBase<TMesh, TQEType *>;
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(QuadEdgeMeshEulerOperatorJoinVertexFunction);
/** Type of QuadEdge with which to apply slicing. */
using QEType = TQEType;
using typename Superclass::MeshType;
using typename Superclass::OutputType;
using PointIdentifier = typename MeshType::PointIdentifier;
using CellIdentifier = typename MeshType::CellIdentifier;
using FaceRefType = typename MeshType::FaceRefType;
/** Evaluate at the specified input position */
virtual OutputType
Evaluate(QEType * e);
enum EdgeStatusType
{
STANDARD_CONFIG = 0,
EDGE_NULL, // 1
MESH_NULL, // 2
EDGE_ISOLATED, // 3
TOO_MANY_COMMON_VERTICES, // 4
TETRAHEDRON_CONFIG, // 5
QUADEDGE_ISOLATED, // 6
FACE_ISOLATED, // 7
SAMOSA_CONFIG, // 8
EYE_CONFIG, // 9
EDGE_JOINING_DIFFERENT_BORDERS // 10
};
itkGetConstMacro(OldPointID, PointIdentifier);
itkGetConstMacro(EdgeStatus, EdgeStatusType);
protected:
QuadEdgeMeshEulerOperatorJoinVertexFunction();
~QuadEdgeMeshEulerOperatorJoinVertexFunction() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
PointIdentifier m_OldPointID{};
EdgeStatusType m_EdgeStatus{};
/**
* \brief
* \param[in] e
* \return The number of common vertices in the 0-ring of e->GetOrigin() and
* e->GetDestination()
*/
PointIdentifier
CommonVertexNeighboor(QEType * e);
/**
* \brief
* \param[in] e
* \return true if it is a tetrahedron
* \return false else
*/
bool
IsTetrahedron(QEType * e);
/**
* \brief
* \param[in] e
* \param[in] iWasLeftFace
* \param[out] oToBeDeleted
* \return true if the face is isolated
* \return false else
*/
bool
IsFaceIsolated(QEType * e, const bool iWasLeftFace, std::stack<TQEType *> & oToBeDeleted);
bool
IsSamosa(QEType * e);
bool
IsEye(QEType * e);
bool
IsEdgeLinkingTwoDifferentBorders(QEType * e);
EdgeStatusType
CheckStatus(QEType * e, std::stack<TQEType *> & oToBeDeleted);
QEType *
Process(QEType * e);
QEType *
ProcessIsolatedQuadEdge(QEType * e);
QEType *
ProcessIsolatedFace(QEType * e, std::stack<QEType *> & EdgesToBeDeleted);
};
} // end namespace itk
#include "itkQuadEdgeMeshEulerOperatorJoinVertexFunction.hxx"
#endif
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