attachment_util_impl.hpp

Go to the documentation of this file.

/*
 * Copyright (c) 2009-2015:  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__LIB_GRID__ATTACHMENT_UTIL_IMPL__
#define __H__LIB_GRID__ATTACHMENT_UTIL_IMPL__
 
#include "attachment_util.h"
 
namespace ug
{
 
//  SetAttachmentValues
template <class TAttachmentAccessor, class TIter, class TVal>
void SetAttachmentValues(TAttachmentAccessor& aaVal,
            TIter elemsBegin, TIter elemsEnd,
            const TVal& val)
{
  while(elemsBegin != elemsEnd)
  {
    aaVal[*elemsBegin] = val;
    ++elemsBegin;
  }
}
 
//  ConvertMathVectorAttachmentValues
template<class TElem, class TSrcAttachment, class TDestAttachment>
bool ConvertMathVectorAttachmentValues(Grid& grid,
              TSrcAttachment& srcAttachment,
              TDestAttachment& destAttachment)
{
  typedef TSrcAttachment ASrc;
  typedef TDestAttachment ADest;
 
//  make sure that the attachments are attached correctly
  if(!grid.has_attachment<TElem>(srcAttachment))
    return false;
    
  if(!grid.has_attachment<TElem>(destAttachment))
    grid.attach_to<TElem>(destAttachment);
    
//  get data containers
  typename ASrc::ContainerType& cSrc
      = *grid.get_attachment_data_container<TElem>(srcAttachment);
  typename ADest::ContainerType& cDest
      = *grid.get_attachment_data_container<TElem>(destAttachment);
 
  int srcDim = ASrc::ValueType::Size;
  int destDim = ADest::ValueType::Size;
  
//  iterate through the elements and copy them
//  if destDim is smaller than srcDim we only have to copy
  if(destDim <= srcDim)
  {
    for(uint i = 0; i < cSrc.size(); ++i)
    {
      typename ASrc::ValueType& vSrc = cSrc[i];
      typename ADest::ValueType& vDest = cDest[i];
      
      for(int j = 0; j < destDim; ++j)
        vDest[j] = vSrc[j];
    }
  }
  else
  {
  //  we have to fill the higher dimensions with 0
    for(uint i = 0; i < cSrc.size(); ++i)
    {
      typename ASrc::ValueType& vSrc = cSrc[i];
      typename ADest::ValueType& vDest = cDest[i];
      
      for(int j = 0; j < srcDim; ++j)
        vDest[j] = vSrc[j];
      
      for(int j = srcDim; j < destDim; ++j)
        vDest[j] = 0;
    }
  }
  
  return true;
}
 
template <class TElem, class TAttachment>
bool CopyAttachments(Grid& srcGrid, TAttachment& aSrc,
          Grid& destGrid, TAttachment& aDest)
{
//  make sure the attachments are properly attached.
  if(!srcGrid.has_attachment<TElem>(aSrc))
    return false;
  
  if(!destGrid.has_attachment<TElem>(aDest))
    destGrid.attach_to<TElem>(aDest);
    
//  access the attachments
  Grid::AttachmentAccessor<TElem, TAttachment> aaSrc(srcGrid, aSrc);
  Grid::AttachmentAccessor<TElem, TAttachment> aaDest(destGrid, aDest);
  
//  iterate over the elements
  typename geometry_traits<TElem>::iterator iterSrc = srcGrid.begin<TElem>();
  typename geometry_traits<TElem>::iterator iterDest = destGrid.begin<TElem>();
 
  while((iterSrc != srcGrid.end<TElem>())
    &&(iterDest != destGrid.end<TElem>()))
  {
    aaDest[*iterDest] = aaSrc[*iterSrc];
    ++iterDest;
    ++iterSrc;
  }
  
//  done
  return true;
}
 
template <class TElemIter, class TAttachment>
bool CopyAttachments(Grid& grid, TElemIter elemsBegin, TElemIter elemsEnd,
           TAttachment& aSrc, TAttachment& aDest)
{
  typedef typename PtrToValueType<
      typename TElemIter::value_type>::base_type TElem;
 
//  make sure the attachments are properly attached.
  if(!grid.has_attachment<TElem>(aSrc))
    return false;
 
  if(!grid.has_attachment<TElem>(aDest))
    grid.attach_to<TElem>(aDest);
 
//  access the attachments
  Grid::AttachmentAccessor<TElem, TAttachment> aaSrc(grid, aSrc);
  Grid::AttachmentAccessor<TElem, TAttachment> aaDest(grid, aDest);
 
//  iterate over the elements
  TElemIter iter = elemsBegin;
  while(iter != elemsEnd)
  {
    aaDest[*iter] = aaSrc[*iter];
    ++iter;
  }
 
//  done
  return true;
}
 
template <class TIterator, class TAAInt>
void AssignIndices(TIterator begin, TIterator end,
          TAAInt& aaInt, int baseIndex)
{
  for(TIterator iter = begin; iter != end; ++iter)
    aaInt[*iter] = baseIndex++;
}
 
template <class TIterator, class TAttAcc>
TIterator FindElementByValue(TIterator begin, TIterator end,
               const typename TAttAcc::ValueType& val,
               TAttAcc& aa)
{
  TIterator iter = begin;
  while(iter != end){
    if(aa[*iter] == val)
      break;
    ++iter;
  }
  return iter;
}
 
}// end of namespace
 
#endif