mekr.cpp

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/**
 *\file         mekr.cpp
 *
 *\brief        make edge and kill ring (inner loop)
 *
 *\image        html mekr.jpg
 *
 *
 *\author       Xianming Chen\n
 *              Computer Science Department\n
 *              University of Utah
 *
 *\date         16 Aug 2006\n
 *              Copyright (c) 2006, University of Utah
 */


#include <cassert>
#include "print.h"


namespace euler
{
  edge_t* face_t :: mekr(edge_t * e1, edge_t * e2)
  {
    assert(e1->l != e2->l && e2->l != l);
    loop_t *lp1 = e1->l, *lp2 = e2->l;
    edge_t
      *ne2 = lp1->mev(e1, e2->v), 
      *ne1 = ne2->o;
    
    if(e2->nxt != e2)
    {
      ne1->nxt = e2;
      ne2->pre = e2->pre;

      e2->pre->nxt = ne2;
      e2->pre = ne1;

      for(edge_t *e = e2; e!= ne2; e=e->nxt)
        e->l = lp1;
    }
    lp2->e = 0;
    del_loop(lp2);

    solid_t::assert_consistent_B_rep();

    return ne1;
  }




}//end namespace euler

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