C++ ON_Brep::FlipFace方法代码示例

static
bool ON_BrepExtrudeHelper_MakeCap(
          ON_Brep& brep,
          int bottom_loop_index,
          const ON_3dVector path_vector,
          const int* side_face_index
          )
{
  bool bCap = true;
  // make cap
  if ( !ON_BrepExtrudeHelper_CheckLoop( brep, bottom_loop_index ) )
    return false;
  brep.m_F.Reserve(brep.m_F.Count() + 1);
  brep.m_L.Reserve(brep.m_L.Count() + 1);
  const ON_BrepLoop& bottom_loop = brep.m_L[bottom_loop_index];
  const ON_BrepFace& bottom_face = brep.m_F[bottom_loop.m_fi];
  const ON_Surface* bottom_surface = bottom_face.SurfaceOf();
  ON_Surface* top_surface = bottom_surface->Duplicate();
  top_surface->Translate( path_vector );
  int top_surface_index = brep.AddSurface( top_surface );
  ON_BrepFace& top_face = brep.NewFace( top_surface_index );

  bCap = ON_BrepExtrudeHelper_MakeTopLoop( brep, top_face, bottom_loop_index, path_vector, side_face_index );
  if ( bCap )
  {
    ON_BrepLoop& top_loop = brep.m_L[brep.m_L.Count()-1];
    if ( bottom_loop.m_type == ON_BrepLoop::inner )
    {
      // we capped an inner boundary
      // top_loop.m_type = ON_BrepLoop::outer; // done in ON_BrepExtrudeHelper_MakeTopLoop
      brep.FlipLoop(top_loop);
    }
    else if ( bottom_loop.m_type == ON_BrepLoop::outer )
    {
      // we capped an outer boundary
      // top_loop.m_type = ON_BrepLoop::outer; // done in ON_BrepExtrudeHelper_MakeTopLoop
      brep.FlipFace(top_face);
    }
  }
  else
  {
    // delete partially made cap face
    brep.DeleteFace( top_face, false );
    delete brep.m_S[top_surface_index];
    brep.m_S[top_surface_index] = 0;
  }
  return bCap;
}

int ON_BrepExtrudeLoop( 
          ON_Brep& brep,
          int loop_index,
          const ON_Curve& path_curve,
          bool bCap
          )
{
  ON_SimpleArray<int> side_face_index; // index of new face above brep.m_L[loop_index].m_ti[lti]
  ON_3dVector path_vector;

  const int face_count0 = brep.m_F.Count();

  if ( loop_index < 0 || loop_index >= brep.m_L.Count() )
    return false;

  if ( !ON_BrepExtrudeHelper_CheckPathCurve(path_curve,path_vector) )
    return false;

  // can only cap closed loops ( for now, just test for inner and outer loops).
  if ( brep.m_L[loop_index].m_type != ON_BrepLoop::outer && brep.m_L[loop_index].m_type != ON_BrepLoop::inner )
    bCap = false;

  // make sides
  if ( !ON_BrepExtrudeHelper_MakeSides( brep, loop_index, path_curve, bCap, side_face_index ) )
    return false;

  // make cap
  if ( bCap )
    bCap = ON_BrepExtrudeHelper_MakeCap( brep, loop_index, path_vector, side_face_index.Array() );

  const ON_BrepLoop& loop = brep.m_L[loop_index];
  if ( loop.m_fi >= 0 && loop.m_fi < brep.m_F.Count() && brep.m_F[loop.m_fi].m_bRev )
  {
    for ( int fi = face_count0; fi < brep.m_F.Count(); fi++ )
    {
      brep.FlipFace( brep.m_F[fi] );
    }
  }

  return (bCap?2:1);
}

//.........这里部分代码省略.........
    ON_SimpleArray<int> side_face_index_loop_mark;
    int li, fli;

    if ( !ON_BrepExtrudeHelper_CheckPathCurve( path_curve, path_vector ) )
      return 0;

    //const int trim_count0 = brep.m_T.Count();
    const int loop_count0 = brep.m_L.Count();
    const int face_count0 = brep.m_F.Count();

    // count number of new objects so we can grow arrays
    // efficiently and use refs to dynamic array elements.
    int new_side_trim_count = 0;
    for ( fli = 0; fli < face_loop_count; fli++ )
    {
      li = brep.m_F[face_index].m_li[fli];
      if ( li < 0 || li >= loop_count0 )
        return false;
      if ( !ON_BrepExtrudeHelper_CheckLoop( brep, li ) )
        continue;
      new_side_trim_count += brep.m_L[li].m_ti.Count();
    }
    if ( new_side_trim_count == 0 )
      return false;
    ON_BrepExtrudeHelper_ReserveSpace( brep, new_side_trim_count, bCap?1:0 );

    side_face_index.Reserve(new_side_trim_count);
    side_face_index_loop_mark.Reserve(face_loop_count);

    const ON_BrepFace& face = brep.m_F[face_index];
  
    rc = true;
    int outer_loop_index = -1;
    int outer_fli = -1;
    for ( fli = 0; fli < face_loop_count && rc; fli++ )
    {
      side_face_index_loop_mark.Append( side_face_index.Count() );
      li = face.m_li[fli];
      if ( !ON_BrepExtrudeHelper_CheckLoop( brep, li ) )
        continue;
      ON_BrepLoop& loop = brep.m_L[li];
      if ( bCap && loop.m_type == ON_BrepLoop::outer )
      {
        if ( outer_loop_index >= 0 )
          bCap = false;
        else 
        {
          outer_loop_index = li;
          outer_fli = fli;
        }
      }
      rc = ON_BrepExtrudeHelper_MakeSides( brep, li, path_curve, bCap, side_face_index );
    }

    if ( bCap && rc && outer_loop_index >= 0 )
    {
      const int face_count1 = brep.m_F.Count();
      bCap = ON_BrepExtrudeHelper_MakeCap( 
                  brep, 
                  outer_loop_index, 
                  path_vector, 
                  side_face_index.Array() + side_face_index_loop_mark[outer_fli] );
      if ( bCap && brep.m_F.Count() > face_count1)
      {
        // put inner bondaries on the cap
        rc = 2;

        ON_BrepFace& cap_face = brep.m_F[brep.m_F.Count()-1];
        for ( fli = 0; fli < face_loop_count && rc; fli++ )
        {
          li = face.m_li[fli];
          if ( li == outer_loop_index )
            continue;
          if ( !ON_BrepExtrudeHelper_CheckLoop( brep, li ) )
            continue;
          if ( ON_BrepExtrudeHelper_MakeTopLoop( 
                      brep, 
                      cap_face, 
                      li, 
                      path_vector,
                      side_face_index.Array() + side_face_index_loop_mark[fli] ) )
          {
            ON_BrepLoop& top_loop = brep.m_L[brep.m_L.Count()-1];
            top_loop.m_type = brep.m_L[li].m_type;
          }
        }
      }
    }

    if ( brep.m_F[face_index].m_bRev )
    {
      for ( int fi = face_count0; fi < brep.m_F.Count(); fi++ )
      {
        brep.FlipFace(brep.m_F[fi]);
      }
    }
  }

  return rc;
}