kef.cpp

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/**
 *\file         kef.cpp
 *
 *\brief        merge two adjacent faces.
 *
 *              Inverse of mef: face is merged to that of opposite half edge.
 *
 *\author       Xianming Chen\n
 *              Computer Science Department\n
 *              University of Utah
 *
 *\date         16 Aug 2006\n
 *              Copyright (c) 2006, University of Utah
 */


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


namespace euler
{
  void solid_t :: kef(edge_t* e)
  {
    assert( e->l->f->l == e->l );     // e has to be on the outer (first) loop of the merged face.
    loop_t *l1 = e->o->l, *l2 = e->l; // l2 is to be merged into l1.
    
    add_face_to(e->l->f, e->o->l->f);

    edge_t *temp = e;
    do
    {
      temp->l = l1;
    }
    while ( (temp=temp->nxt) != e );

    //merge l2 to l1.
    e->o->pre->nxt = e->nxt;
    e->nxt->pre = e->o->pre;

    e->pre->nxt = e->o->nxt;
    e->o->nxt->pre = e->pre;

    if(l1->e == e->o)
      l1->e = e->o->nxt;

    l2->e = 0;
    l1->f->del_loop(l2);

    delete e;
    delete e->o;

    solid_t::assert_consistent_B_rep();
  }
  




}//end namespace euler

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