ComponentsPluginT_impl.hh

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#define COMPONENTSPLUGIN_CC
 
#include "ComponentsPlugin.hh"
#include <iostream>
#include <vector>
 
#include <OpenFlipper/BasePlugin/PluginFunctions.hh>
 
//------------------------------------------------------------------------------
 
 
template< class MeshT >
void
ComponentsPlugin::splitComponent( MeshT*   _mesh, MeshT* _copy){
 
  //init properties
  OpenMesh::FPropHandleT< bool > visited;
 
  if ( !_mesh->get_property_handle(visited,"visited") )
    _mesh->add_property(visited, "visited");
 
  //init property for all faces
  for (auto f_it : _mesh->faces()) {
      _mesh->property(visited, f_it) = false;
  }
 
  typename OpenMesh::SmartFaceHandle fh;
 
  //Take the first face in the mesh as we only split one component apart
  fh = *(_mesh->faces_begin());
  _mesh->property(visited, fh) = true;
 
  //if none was found -> finished
  if (!fh.is_valid() ) return;
 
  std::vector< typename OpenMesh::SmartFaceHandle > handles;
  handles.push_back( fh );
 
  // grow from face and collect faces in this component
  while( handles.size() > 0 ){
 
    typename OpenMesh::SmartFaceHandle current = handles.back();
    handles.pop_back();
 
    for (auto ff_it : current.faces() )
        if ( ! _mesh->property(visited, ff_it) ){
            _mesh->property(visited, ff_it) = true;
            handles.push_back( ff_it );
        }
  }
 
  //delete the found component from the original mesh and keep it in the copy
  for (auto f_it : _mesh->faces()) {
  // -1 means not the component
      if ( _mesh->property(visited, f_it) )
        _mesh->delete_face( f_it );
      else
        _copy->delete_face( f_it );
  }
 
  //remove garbage from the components
  _copy->garbage_collection();
  _mesh->garbage_collection();
 
  _mesh->remove_property(visited);
 
}
 
template< class MeshT >
void
ComponentsPlugin::selectBiggestComponent( MeshT*   _mesh){
 
 
  OpenMesh::FPropHandleT< bool > visited;
  if ( !_mesh->get_property_handle(visited,"visited") )
    _mesh->add_property(visited, "visited");
 
  std::vector<typename OpenMesh::SmartFaceHandle> facesInBiggest;
 
  for (auto fIter : _mesh->faces())
  {
    if (_mesh->property(visited,fIter))
      continue;
 
    //It is a vertex, which is not visited => new component
    std::vector<typename OpenMesh::SmartFaceHandle> componentFaces;
    componentFaces.push_back(fIter);
 
    for(std::size_t i = 0; i < componentFaces.size(); ++i )
    {
      //add all not visited neightbours
      for (auto ffIter : componentFaces[i].faces())
      {
        if (!ffIter.is_valid())
          std::cout << "handleId: " << ffIter << std::endl;
        if (ffIter.is_valid() && !_mesh->property(visited,ffIter) )
        {
          _mesh->property(visited,ffIter) = true;
          componentFaces.push_back(ffIter);
        }
      }
    }
 
    //all faces are found, so compare the components
    if (facesInBiggest.size() < componentFaces.size())
    {
      std::swap(facesInBiggest,componentFaces);
    }
  }
  _mesh->remove_property(visited);
 
  //select all faces in the biggest component;
  for (auto iter : facesInBiggest)
  {
    _mesh->status(iter).set_selected(true);
  }
}
 
template< class MeshT >
void ComponentsPlugin::deleteUnselectedFaces( MeshT*   _mesh)
{
  for (auto fIter : _mesh->faces())
  {
    if (!_mesh->status(fIter).selected())
    {
      //delete face and isolated vertices
      _mesh->delete_face(fIter,true);
    }
    else
    {
      _mesh->status(fIter).set_selected(false);
    }
  }
 
  _mesh->garbage_collection();
}