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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 itkQuadEdgeMeshEulerOperatorFlipEdgeFunction_hxx
#define itkQuadEdgeMeshEulerOperatorFlipEdgeFunction_hxx
#include "itkQuadEdgeMeshEulerOperatorJoinFacetFunction.h"
#include "itkQuadEdgeMeshEulerOperatorSplitFacetFunction.h"
namespace itk
{
template <typename TMesh, typename TQEType>
QuadEdgeMeshEulerOperatorFlipEdgeFunction<TMesh, TQEType>::QuadEdgeMeshEulerOperatorFlipEdgeFunction()
: Superclass()
{}
template <typename TMesh, typename TQEType>
void
QuadEdgeMeshEulerOperatorFlipEdgeFunction<TMesh, TQEType>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "EdgeStatus: " << m_EdgeStatus;
}
template <typename TMesh, typename TQEType>
void
QuadEdgeMeshEulerOperatorFlipEdgeFunction<TMesh, TQEType>::CheckStatus(QEType * h)
{
#ifndef NDEBUG
if (h == (QEType *)nullptr)
{
m_EdgeStatus = EdgeStatusEnum::EDGE_NULL;
return;
}
if (!this->m_Mesh)
{
m_EdgeStatus = EdgeStatusEnum::MESH_NULL;
return;
}
#endif
if (!h->IsInternal())
{
m_EdgeStatus = EdgeStatusEnum::NON_INTERNAL_EDGE;
return;
}
if (!h->IsLnextOfTriangle())
{
m_EdgeStatus = EdgeStatusEnum::NON_TRIANGULAR_LEFT_FACE;
return;
}
if (!h->GetSym()->IsLnextOfTriangle())
{
m_EdgeStatus = EdgeStatusEnum::NON_TRIANGULAR_RIGHT_FACE;
return;
}
if (this->m_Mesh->FindEdge(h->GetOnext()->GetDestination(), h->GetSym()->GetOnext()->GetDestination()) != nullptr)
{
m_EdgeStatus = EdgeStatusEnum::EXISTING_OPPOSITE_EDGE;
return;
}
m_EdgeStatus = EdgeStatusEnum::STANDARD_CONFIG;
}
template <typename TMesh, typename TQEType>
auto
QuadEdgeMeshEulerOperatorFlipEdgeFunction<TMesh, TQEType>::Evaluate(QEType * h) -> OutputType
{
//
// X ---<-G---- X X ---<-G---- X
// | / | | \ |
// | / | | \ |
// | / | | \ |
// | / | | \ |
// | ^ | | \ |
// | h | | newEdge |
// | / | | \ |
// | / | | \ |
// | / | | \ |
// | / | | \ |
// X ---H->---- X X ---H->---- X
//
CheckStatus(h);
switch (m_EdgeStatus)
{
default:
case EdgeStatusEnum::STANDARD_CONFIG:
return Process(h);
case EdgeStatusEnum::EDGE_NULL:
itkDebugMacro("No Edge to flip.");
return ((QEType *)nullptr);
case EdgeStatusEnum::MESH_NULL:
itkDebugMacro("No mesh present.");
return ((QEType *)nullptr);
case EdgeStatusEnum::NON_INTERNAL_EDGE:
itkDebugMacro("Can only flip internal edge.");
return ((QEType *)nullptr);
case EdgeStatusEnum::NON_TRIANGULAR_LEFT_FACE:
itkDebugMacro("Can only flip edge for triangles.");
return ((QEType *)nullptr);
case EdgeStatusEnum::NON_TRIANGULAR_RIGHT_FACE:
itkDebugMacro("Can only flip edge for triangles.");
return ((QEType *)nullptr);
case EdgeStatusEnum::EXISTING_OPPOSITE_EDGE:
itkDebugMacro("The opposite edge already exists.");
return ((QEType *)nullptr);
}
}
template <typename TMesh, typename TQEType>
auto
QuadEdgeMeshEulerOperatorFlipEdgeFunction<TMesh, TQEType>::Process(QEType * h) -> OutputType
{
// The following is not optimum, since we create a new face (with JoinFacet)
// that is immediately deleted (with SplitFacet). Still we chose to write it
// that way in the sake of maintenance simplicity (as long as JoinFacet and
// SplitFacet are working, this operator does it job).
using JoinFacet = QuadEdgeMeshEulerOperatorJoinFacetFunction<MeshType, QEType>;
using SplitFacet = QuadEdgeMeshEulerOperatorSplitFacetFunction<MeshType, QEType>;
QEType * G = h->GetLnext();
auto joinFacet = JoinFacet::New();
joinFacet->SetInput(this->m_Mesh);
QEType * H = joinFacet->Evaluate(h)->GetLnext();
auto splitFacet = SplitFacet::New();
splitFacet->SetInput(this->m_Mesh);
return (splitFacet->Evaluate(H, G));
}
} // end namespace itk
#endif
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