cylinder_cut_projector.h

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/*
 * Copyright (c) 2016:  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_cylinder_cut_projector
#define __H__UG_cylinder_cut_projector
 
#include "refinement_projector.h"
 
namespace ug{
 
 
class CylinderCutProjector : public RefinementProjector {
public:
  CylinderCutProjector () :
    m_center (0, 0, 0),
    m_axis (0, 0, 1),
    m_radius (1)
  {}
  
  CylinderCutProjector (const vector3& center,
              const vector3& axis,
              number radius) :
    m_center (center),
    m_axis (axis),
    m_radius (radius)
  {}
 
  CylinderCutProjector (SPIGeometry3d geometry,
              const vector3& center,
              const vector3& axis,
              number radius) :
    RefinementProjector (geometry),
    m_center (center),
    m_axis (axis),
    m_radius (radius)
  {}
 
 
 
  virtual ~CylinderCutProjector ()      {}
 
  void set_center (const vector3& center)   {m_center = center;}
  const vector3& center () const        {return m_center;}
 
  void set_axis (const vector3& axis)     {m_axis = axis;}
  const vector3& axis () const        {return m_axis;}
 
  void set_radius (number radius)       {m_radius = radius;}
  number radius () const            {return m_radius;}
 
  virtual number new_vertex(Vertex* vrt, Edge* parent)
  {
    number t0, t1;
    vector3 from = pos(parent->vertex(0));
    vector3 dir;
    VecSubtract(dir, pos(parent->vertex(1)), from);
 
    if(RayCylinderIntersection(t0, t1, from, dir, m_center, m_axis, m_radius))
    {
    //  if there are two intersections with parameters between 0 and 1,
    //  we'll return their median.
      bool t0IsFine = (t0 >= 0) && (t0 <= 1);
      bool t1IsFine = (t1 >= 0) && (t1 <= 1);
      if(t0IsFine){
        if(t1IsFine) {
          vector3 v0, v1, p;
          VecScaleAdd(v0, 1., from, t0, dir);
          VecScaleAdd(v1, 1., from, t1, dir);
          VecScaleAdd(p, 0.5, v0, 0.5, v1);
          set_pos(vrt, p);
        }
        else {
          vector3 p;
          VecScaleAdd(p, 1., from, t0, dir);
          set_pos(vrt, p);
        }
        return 1;
      }
      else if(t1IsFine) {
        vector3 p;
        VecScaleAdd(p, 1., from, t1, dir);
        set_pos(vrt, p);
        return 1;
      }
    }
 
    RefinementProjector::new_vertex(vrt, parent);
    return 1;
  }
 
private:
  friend class boost::serialization::access;
 
  template <class Archive>
  void serialize( Archive& ar, const unsigned int version)
  {
    ar & make_nvp("center", m_center);
    ar & make_nvp("axis", m_axis);
    ar & make_nvp("radius", m_radius);
    UG_EMPTY_BASE_CLASS_SERIALIZATION(CylinderCutProjector, RefinementProjector);
  }
 
  vector3 m_center;
  vector3 m_axis;
  number  m_radius;
};
 
}// end of namespace
 
#endif  //__H__UG_cylinder_cut_projector