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#ifndef FPMAMESHREADER_H
#define FPMAMESHREADER_H
#include "MeshReader.h"
#include "../../MeshElements/MeshElement.h"
#include <iostream>
#include <unordered_map>
template <unsigned int MeshDimension>
class FPMAMeshReader : public MeshReader<MeshDimension>{
};
template <>
class FPMAMeshReader<3> : public MeshReader<3> {
public:
template<typename IndexType, typename Real, unsigned int ...Reserve>
void loadVertices(std::istream& ist,MeshElements<3, IndexType, Real, Reserve...>& mesh){
IndexType numVert;
ist >> numVert;
mesh.getVertices().resize(numVert);
for (IndexType i = 0; i < numVert; i++) {
typename MeshElements<3, IndexType, Real, Reserve...>::Vertex& vert = mesh.getVertices().at(i);
vert.setIndex(i);
ist >> vert[0];
ist >> vert[1];
ist >> vert[2];
}
}
template<typename IndexType, typename Real, unsigned int ...Reserve>
void loadFaces(std::istream& ist,MeshElements<3, IndexType, Real, Reserve...>& mesh){
// map of constructed edges
std::unordered_map<std::string, IndexType> edges;
IndexType numFace;
ist >> numFace;
mesh.getFaces().resize(numFace);
// read face verts
for (IndexType faceIndex = 0; faceIndex < numFace; faceIndex++) {
mesh.getFaces().at(faceIndex).setIndex(faceIndex);
IndexType numVert;
ist >> numVert;
std::vector<IndexType> vertices(numVert);
for(IndexType j = 0; j < numVert; j++){
ist >> vertices.at(j);
}
for(IndexType j = 0; j < numVert; j++){
IndexType iA = vertices.at(j), iB = vertices.at((j+1)%numVert);
std::string edgeKey = iA < iB ? std::to_string(iA) +";"+ std::to_string(iB) : std::to_string(iB) +";"+ std::to_string(iA);
typename std::unordered_map<std::string, IndexType>::iterator edgeIt = edges.find(edgeKey);
IndexType edgeIndex = IndexType();
if (edgeIt == edges.end()){
edgeIndex = mesh.getEdges().size();
mesh.getEdges().push_back({});
mesh.getEdges().at(edgeIndex).setVertexAIndex(iA);
mesh.getEdges().at(edgeIndex).setVertexBIndex(iB);
mesh.getEdges().at(edgeIndex).setIndex(edgeIndex);
edges[edgeKey] = edgeIndex;
} else {
edgeIndex = edgeIt->second;
}
try {
mesh.getFaces().at(faceIndex).getSubelements().addSubelement(edgeIndex, true);
} catch (std::runtime_error& err) {
throw std::runtime_error(std::string("The number of edges has overflew the prealocated memory ") +
std::to_string(mesh.getFaces().at(faceIndex).getSubelements().size()) +
" in face number " + std::to_string(faceIndex) + " while adding edge number " +
std::to_string(edgeIndex) + " ( vertA : " +std::to_string(iA) +
"vertB : " + std::to_string(iB) + ")\n" + err.what());
}
}
}
mesh.getEdges().shrink_to_fit();
}
template<typename IndexType, typename Real, unsigned int ...Reserve>
void loadCells(std::istream& ist,MeshElements<3, IndexType, Real, Reserve...>& mesh){
IndexType numCells;
ist >> numCells;
mesh.getCells().resize(numCells);
// read cells
for (IndexType cellIndex = 0; cellIndex < numCells; cellIndex++) {
mesh.getCells().at(cellIndex).setIndex(cellIndex);
// read cell faces
IndexType numFaces;
ist >> numFaces;
IndexType prevFace = INVALID_INDEX(IndexType);
for(IndexType j = 0; j < numFaces; j++){
IndexType faceIndex;
ist >> faceIndex;
if (j == 0){
mesh.getCells().at(cellIndex).setBoundaryElementIndex(faceIndex);
}
if (prevFace != INVALID_INDEX(IndexType)){
mesh.getFaces().at(prevFace).setNextBElem(faceIndex, cellIndex);
}
if (j == numFaces -1) {
mesh.getFaces().at(faceIndex).setNextBElem(mesh.getCells().at(cellIndex).getBoundaryElementIndex(), cellIndex);
}
prevFace = faceIndex;
}
}
}
template<typename IndexType, typename Real, unsigned int ...Reserve>
void loadFromStream(std::istream& ist,MeshElements<3, IndexType, Real, Reserve...>& mesh){
ist.seekg(ist.beg);
loadVertices(ist, mesh);
loadFaces(ist, mesh);
loadCells(ist, mesh);
}
};
#endif // FPMAMESHREADER_H