crease_util_impl.h

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/*
 * Copyright (c) 2015:  G-CSC, Goethe University Frankfurt
 * Author: Sebastian Reiter
 * 
 * This file is part of UG4.
 * 
 * UG4 is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 3 (as published by the
 * Free Software Foundation) with the following additional attribution
 * requirements (according to LGPL/GPL v3 §7):
 * 
 * (1) The following notice must be displayed in the Appropriate Legal Notices
 * of covered and combined works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (2) The following notice must be displayed at a prominent place in the
 * terminal output of covered works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (3) The following bibliography is recommended for citation and must be
 * preserved in all covered files:
 * "Reiter, S., Vogel, A., Heppner, I., Rupp, M., and Wittum, G. A massively
 *   parallel geometric multigrid solver on hierarchically distributed grids.
 *   Computing and visualization in science 16, 4 (2013), 151-164"
 * "Vogel, A., Reiter, S., Rupp, M., Nägel, A., and Wittum, G. UG4 -- a novel
 *   flexible software system for simulating pde based models on high performance
 *   computers. Computing and visualization in science 16, 4 (2013), 165-179"
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 */
 
#ifndef __H__UG_crease_util_impl
#define __H__UG_crease_util_impl
 
#include <algorithm>
#include "lib_grid/iterators/associated_elements_iterator.h"
 
namespace ug{
 
template <class TVrtIter, class TAAPos>
void SelectKinkVertices(Selector& sel, TVrtIter vrtsBegin, TVrtIter vrtsEnd,
            number thresholdAngle, bool selectDarts, TAAPos aaPos,
            Grid::edge_traits::callback cbConsiderEdge)
{
  using std::max;
  using std::endl;
  typedef typename TAAPos::ValueType vector_t;
 
  if(!sel.grid())
    return;
 
  Grid& grid = *sel.grid();
 
  number thresholdRad = deg_to_rad(thresholdAngle);
  AssocElemIter<Vertex, Edge> eiter(cbConsiderEdge);
 
  for(TVrtIter viter = vrtsBegin; viter != vrtsEnd; ++viter){
    Vertex* v = *viter;
    Vertex* cv[2];
    int numCons = 0;
    for(eiter.reinit(grid, v); eiter.valid(); ++eiter){
      Edge* e = *eiter;
      if(numCons < 2)
        cv[numCons] = GetConnectedVertex(e, v);
      ++numCons;
    }
    if(numCons == 2){
      vector_t dir0, dir1;
      VecSubtract(dir0, aaPos[v], aaPos[cv[0]]);
      VecSubtract(dir1, aaPos[cv[1]], aaPos[v]);
      if(VecAngle(dir0, dir1) >= thresholdRad)
        sel.select(v);
    }
    else if(selectDarts){
      sel.select(v);
    }
  }
}
 
}// end of namespace
 
#endif  //__H__UG_crease_util_impl