Traits.hh

Go to the documentation of this file.

/* ========================================================================= *
 *                                                                           *
 *                               OpenMesh                                    *
 *           Copyright (c) 2001-2022, RWTH-Aachen University                 *
 *           Department of Computer Graphics and Multimedia                  *
 *                          All rights reserved.                             *
 *                            www.openmesh.org                               *
 *                                                                           *
 *---------------------------------------------------------------------------*
 * This file is part of OpenMesh.                                            *
 *---------------------------------------------------------------------------*
 *                                                                           *
 * Redistribution and use in source and binary forms, with or without        *
 * modification, are permitted provided that the following conditions        *
 * are met:                                                                  *
 *                                                                           *
 * 1. Redistributions of source code must retain the above copyright notice, *
 *    this list of conditions and the following disclaimer.                  *
 *                                                                           *
 * 2. Redistributions in binary form must reproduce the above copyright      *
 *    notice, this list of conditions and the following disclaimer in the    *
 *    documentation and/or other materials provided with the distribution.   *
 *                                                                           *
 * 3. Neither the name of the copyright holder nor the names of its          *
 *    contributors may be used to endorse or promote products derived from   *
 *    this software without specific prior written permission.               *
 *                                                                           *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       *
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A           *
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,  *
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,       *
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR        *
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF    *
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING      *
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS        *
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              *
 *                                                                           *
 * ========================================================================= */
 
 
 
//=============================================================================
//
//  CLASS Traits
//
//=============================================================================
 
#ifndef OPENMESH_SUBDIVIDER_ADAPTIVE_TRAITS_HH
#define OPENMESH_SUBDIVIDER_ADAPTIVE_TRAITS_HH
 
 
//== INCLUDES =================================================================
 
#include <map>
#include <OpenMesh/Core/Mesh/Types/TriMesh_ArrayKernelT.hh>
 
//== NAMESPACE ================================================================
 
namespace OpenMesh   { // BEGIN_NS_OPENMESH
namespace Subdivider { // BEGIN_NS_DECIMATER
namespace Adaptive   { // BEGIN_NS_ADAPTIVE
 
 
//== CLASS DEFINITION =========================================================
 
// typedef unsigned short state_t;
// const state_t mask_final = 1 << ((sizeof(state_t)*8)-1);
// const state_t mask_state = ~mask_final;
 
typedef int  state_t;
typedef bool final_t;
   
struct State
{
   int      state : 31;
   unsigned final : 1;
};
   
struct Traits : public OpenMesh::DefaultTraits
{
   
  // add face normals
  FaceAttributes( OpenMesh::Attributes::Normal );
  
  // add vertex normals
  VertexAttributes( OpenMesh::Attributes::Normal );
 
  // add previous halfedge handle
  HalfedgeAttributes( OpenMesh::Attributes::PrevHalfedge );
   
  FaceTraits
  {
 
  private:
 
    typedef typename Refs::Point Point;
    typedef typename Refs::HalfedgeHandle HalfedgeHandle;
    typedef std::map<state_t, Point> PositionHistory;
 
    State                state_;
    HalfedgeHandle       red_halfedge_;
 
    PositionHistory      pos_map_;
    
  public:
 
    // face state
    state_t state() const { return state_t(state_.state); }
    void    set_state(const state_t _s) { state_.state = _s; }
    void    inc_state() { ++state_.state; }
 
    // face not final if divided (loop) or edge not flipped (sqrt(3))
    final_t final() const   { return final_t(state_.final); }
    void    set_final()     { state_.final = true; }
    void    set_not_final() { state_.final = false; }
 
    // halfedge of dividing edge (red-green triangulation)
    const HalfedgeHandle& red_halfedge() const { return red_halfedge_; }
    void  set_red_halfedge(const HalfedgeHandle& _h) { red_halfedge_ = _h; }
 
    // position of face, depending on generation _i. 
    void set_position(const int& _i, const Point& _p) { pos_map_[_i] = _p; }
    const Point position(const int& _i) { 
      if (pos_map_.find(_i) != pos_map_.end())
        return pos_map_[_i];
      else {
        
        if (_i <= 0) {
          const Point zero_point(0.0, 0.0, 0.0);
          return zero_point;
        }
 
        return position(_i - 1);
      }
    }
  }; // end class FaceTraits
 
 
  EdgeTraits
  {
 
  private:
 
    typedef typename Refs::Point Point;
    typedef std::map<state_t, Point> PositionHistory;
 
    State           state_;
    PositionHistory pos_map_;
 
  public: 
 
    typedef typename Refs::Scalar Scalar;
 
    // Scalar weight_;
 
    // state of edge
    state_t state() const { return state_t(state_.state); }
    void    set_state(const state_t _s) { state_.state = _s; }
    void    inc_state() { ++state_.state; }
 
    // edge not final if dividing face (Loop) or edge not flipped (SQRT(3))
    final_t final() const   { return final_t(state_.final); }
    void    set_final()     { state_.final = true; }
    void    set_not_final() { state_.final = false; }
 
    // position of edge, depending on generation _i. 
    void set_position(const int& _i, const Point& _p) { pos_map_[_i] = _p; }
    const Point position(const int& _i) {
 
      if (pos_map_.find(_i) != pos_map_.end()) 
      {
        return pos_map_[_i];
      }
      else 
      {
        if (_i <= 0) 
        {
          const Point zero_point(0.0, 0.0, 0.0);
          return zero_point;
        }
 
        return position(_i - 1);
      }
    }
  }; // end class EdgeTraits
 
 
  VertexTraits
  {
 
  private:
 
    typedef typename Refs::Point Point;
    typedef std::map<state_t, Point> PositionHistory;
 
    State   state_;
 
    PositionHistory pos_map_;
 
  public:
 
    // state of vertex
    state_t state() const { return state_.state; }
    void    set_state(const state_t _s) { state_.state = _s; }
    void    inc_state() { ++state_.state; }
 
 
    // usually not needed by loop or sqrt(3)
    final_t final() const   { return state_.final; }
    void    set_final()     { state_.final = true; }
    void    set_not_final() { state_.final = false; }
 
    // position of vertex, depending on generation _i. (not for display)
    void set_position(const int& _i, const Point& _p) { pos_map_[_i] = _p; }
    const Point position(const int& _i) { 
 
      if (pos_map_.find(_i) != pos_map_.end()) 
 
        return pos_map_[_i];
 
      else {
 
        if (_i <= 0) {
 
          const Point zero_point(0.0, 0.0, 0.0);
          return zero_point;
        }
 
        return position(_i - 1);
      }
    }
  }; // end class VertexTraits
}; // end class Traits
 
//=============================================================================
} // END_NS_ADAPTIVE
} // END_NS_SUBDIVIDER
} // END_NS_OPENMESH
//=============================================================================
#endif // OPENMESH_SUBDIVIDER_ADAPTIVE_TRAITS_HH defined
//=============================================================================