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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 itkQuadEdgeMeshEulerOperatorCreateCenterVertexFunction_hxx
#define itkQuadEdgeMeshEulerOperatorCreateCenterVertexFunction_hxx
namespace itk
{
template <typename TMesh, typename TQEType>
auto
QuadEdgeMeshEulerOperatorCreateCenterVertexFunction<TMesh, TQEType>::Evaluate(QEType * e) -> OutputType
{
// Is there any input ?
#ifndef NDEBUG
if (!e)
{
itkDebugMacro("Input is not an edge.");
return ((QEType *)nullptr);
}
if (!this->m_Mesh)
{
itkDebugMacro("No mesh present.");
return ((OutputType) nullptr);
}
// Is left face set ?
if (!e->IsLeftSet())
{
itkDebugMacro("Argument edge has no left face.");
return ((OutputType) nullptr);
}
#endif
// remove left face
this->m_Mesh->DeleteFace(e->GetLeft());
// create new point geometry
unsigned int sum = 0;
VectorType vec;
vec.Fill(0);
PointIdentifier pid = this->m_Mesh->FindFirstUnusedPointIndex();
using AssociatedBarycenters = std::map<QEType *, PointIdentifier>;
AssociatedBarycenters m_AssocBary;
using QEIterator = typename QEType::IteratorGeom;
QEIterator lit = e->BeginGeomLnext();
while (lit != e->EndGeomLnext())
{
QEType * g = lit.Value();
vec += this->m_Mesh->GetVector(g->GetOrigin());
++sum;
m_AssocBary[g] = pid;
++lit;
} // rof
vec /= CoordRepType(sum);
PointType p;
for (unsigned int i = 0; i < 3; ++i)
{
p[i] = vec[i];
}
// add new point to mesh
this->m_NewPointID = this->m_Mesh->AddPoint(p);
PointIdentifier tempPoint;
// create edges and faces
tempPoint = e->GetDestination();
this->m_Mesh->AddFaceTriangle(this->m_NewPointID, e->GetOrigin(), tempPoint);
QEType * edgeRef = this->m_Mesh->FindEdge(this->m_NewPointID, tempPoint);
while (!edgeRef->IsLeftSet())
{
tempPoint = edgeRef->GetLnext()->GetDestination();
this->m_Mesh->AddFaceTriangle(this->m_NewPointID, edgeRef->GetLnext()->GetOrigin(), tempPoint);
edgeRef = this->m_Mesh->FindEdge(this->m_NewPointID, tempPoint);
}
return (e->GetLnext());
}
} // end namespace itk
#endif
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