ext/OGDF/src/energybased/Overlap.cpp

   1 /*
   2  * $Revision: 2552 $
   3  *
   4  * last checkin:
   5  *   $Author: gutwenger $
   6  *   $Date: 2012-07-05 16:45:20 +0200 (Do, 05. Jul 2012) $
   7  ***************************************************************/
   8
   9 /** \file
  10  * \brief Implementation of class Overlap
  11  *
  12  * \author Rene Weiskircher
  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
  44 #include <ogdf/internal/energybased/Overlap.h>
  45
  46 namespace ogdf {
  47
  48         Overlap::Overlap(GraphAttributes &AG) : NodePairEnergy("Overlap",AG){}
  49
  50         double Overlap::computeCoordEnergy(node v1, node v2, const DPoint &p1, const DPoint &p2)
  51                 const
  52         {
  53                 IntersectionRectangle i1(shape(v1)), i2(shape(v2));
  54                 i1.move(p1);
  55                 i2.move(p2);
  56                 IntersectionRectangle intersection = i1.intersection(i2);
  57                 double area = intersection.area();
  58                 if(area < 0.0) {
  59                         OGDF_ASSERT(area > -0.00001);
  60                         area = 0.0;
  61                 }
  62                 double minArea = min(i1.area(),i2.area());
  63                 double energy = area / minArea;
  64                 return energy;
  65         }
  66
  67 }// namespace ogdf
  68