ElementDofIterator.cc 3.14 KB
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//
// Software License for AMDiS
//
// Copyright (c) 2010 Dresden University of Technology 
// All rights reserved.
// Authors: Simon Vey, Thomas Witkowski et al.
//
// This file is part of AMDiS
//
// See also license.opensource.txt in the distribution.


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#include "ElementDofIterator.h"
#include "Mesh.h"
#include "DOFAdmin.h"
#include "Element.h"
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#include "BasisFunction.h"
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namespace AMDiS {

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  void ElementDofIterator::reset(const Element* el)
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  {
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    FUNCNAME_DBG("ElementDofIterator::reset()");
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    TEST_EXIT_DBG(el->getMesh() == mesh)
      ("Mesh and element does not fit together!\n");
    TEST_EXIT_DBG(el)("No element!\n");

    element = el;
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    dofs = element->getDof();
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    // Start with vertices.
    pos = 0;
    elementPos = 0;
    dofPos = 0;

    // Get geo index of vertices in the given dimension.
    posIndex = INDEX_OF_DIM(pos, dim);
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    // Get number of DOFs per vertex (should be one in all cases).
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    nDofs = admin->getNumberOfDofs(posIndex);
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    TEST_EXIT_DBG(nDofs != 0)("Mh, I've to think about this situation!\n");

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    // Calculate displacement. Is used if there is more than one DOF admin 
    // on the mesh.
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    n0 = admin->getNumberOfPreDofs(posIndex);
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    // Get first DOF index position for vertices.
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    node0 = mesh->getNode(posIndex);
    // Get number of vertices in this dimension.
    nElements = Global::getGeo(posIndex, mesh->getDim());
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    if (inOrder)
      orderPosition = basisFcts->orderOfPositionIndices(element, posIndex, 0);
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  }

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  bool ElementDofIterator::next()
  {
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    // First iterate over the DOFs of one element (vertex, edge, face).
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    dofPos++;

    if (dofPos >= nDofs) {
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      // We are finished with all DOFs of on element. Go to the next one.
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      dofPos = 0;
      elementPos++;

      if (elementPos >= nElements) {
	// We are finished with all element.
	elementPos = 0;

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	// If we have iterated over all positions, we can finish the iteration.
	if (pos >= dim)
	  return false;

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	// Increase position, i.e., go from vertices to edges to faces and search
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	// for the next position with DOFs.
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	do {
	  pos++;
	  // Get geo index posistion.
	  posIndex = INDEX_OF_DIM(pos, dim);
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	  // Get number of DOFs in this position.
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	  nDofs = admin->getNumberOfDofs(posIndex);
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	} while (nDofs == 0 && pos < dim);
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	if (nDofs > 0 && pos <= dim) {
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	  // We have found on more position with DOFs.
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	  // Get number of elements in this position, i.e, the number of 
	  // vertices, edges and faces in the given dimension.
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	  nElements = Global::getGeo(posIndex, dim);
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	  // Calculate displacement. Is used if there is more than one DOF 
	  // admin on the mesh.
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	  n0 = admin->getNumberOfPreDofs(posIndex);
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	  // Get first DOF index position for the geo index position.
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	  node0 = mesh->getNode(posIndex);
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	  if (inOrder)
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	    orderPosition =
	      basisFcts->orderOfPositionIndices(element, posIndex, 0);
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	} else {
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	  // That's all, we jave traversed all DOFs of the mesh element.
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	  return false;
	}

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      } else {
	if (inOrder)
	  orderPosition = 
	    basisFcts->orderOfPositionIndices(element, posIndex, elementPos);
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      }
    }

    return true;
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  }

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  bool ElementDofIterator::nextStrict()
  {
    dofPos = nDofs;
    return next();
  }
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}