ext/OGDF/src/energybased/multilevelmixer/MedianPlacer.cpp

   1 /*
   2  * $Revision: 2523 $
   3  *
   4  * last checkin:
   5  *   $Author: gutwenger $
   6  *   $Date: 2012-07-02 20:59:27 +0200 (Mon, 02 Jul 2012) $
   7  ***************************************************************/
   8
   9 /** \file
  10  * \brief Places Nodes at the Positio of the merge-partner
  11  *
  12  * \author Gereon Bartel
  13  *
  14  * \par License:
  15  * This file is part of the Open Graph Drawing Framework (OGDF).
  16  *
  17  * \par
  18  * Copyright (C)<br>
  19  * See README.txt in the root directory of the OGDF installation for details.
  20  *
  21  * \par
  22  * This program is free software; you can redistribute it and/or
  23  * modify it under the terms of the GNU General Public License
  24  * Version 2 or 3 as published by the Free Software Foundation;
  25  * see the file LICENSE.txt included in the packaging of this file
  26  * for details.
  27  *
  28  * \par
  29  * This program is distributed in the hope that it will be useful,
  30  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  31  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  32  * GNU General Public License for more details.
  33  *
  34  * \par
  35  * You should have received a copy of the GNU General Public
  36  * License along with this program; if not, write to the Free
  37  * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  38  * Boston, MA 02110-1301, USA.
  39  *
  40  * \see  http://www.gnu.org/copyleft/gpl.html
  41  ***************************************************************/
  42
  43 #include <ogdf/energybased/multilevelmixer/MedianPlacer.h>
  44 #include <algorithm>
  45 #include <vector>
  46
  47 namespace ogdf {
  48
  49 void MedianPlacer::placeOneLevel(MultilevelGraph &MLG)
  50 {
  51         int level = MLG.getLevel();
  52         while (MLG.getLevel() == level && MLG.getLastMerge() != 0)
  53         {
  54                 placeOneNode(MLG);
  55         }
  56 }
  57
  58
  59 void MedianPlacer::placeOneNode(MultilevelGraph &MLG)
  60 {
  61         node merged = MLG.undoLastMerge();
  62         int i = 0;
  63         std::vector<double> xVector;
  64         std::vector<double> yVector;
  65         adjEntry adj;
  66         forall_adj(adj, merged) {
  67                 i++;
  68                 xVector.push_back(MLG.x(adj->twinNode()));
  69                 yVector.push_back(MLG.y(adj->twinNode()));
  70         }
  71         std::nth_element(xVector.begin(), xVector.begin()+(i/2), xVector.end());
  72         std::nth_element(yVector.begin(), yVector.begin()+(i/2), yVector.end());
  73         double x = xVector[i/2];
  74         double y = yVector[i/2];
  75         if (i % 2 == 0) {
  76                 std::nth_element(xVector.begin(), xVector.begin()+(i/2)-1, xVector.end());
  77                 std::nth_element(yVector.begin(), yVector.begin()+(i/2)-1, yVector.end());
  78                 x += xVector[i/2 - 1];
  79                 y += yVector[i/2 - 1];
  80                 x /= 2.0;
  81                 y /= 2.0;
  82         }
  83         MLG.x(merged, x + ((m_randomOffset)?(float)randomDouble(-1.0, 1.0):0.f));
  84         MLG.y(merged, y + ((m_randomOffset)?(float)randomDouble(-1.0, 1.0):0.f));
  85 }
  86
  87 } // namespace ogdf