Line data    Source code

       1              : /*
       2              :  * Copyright (c) 2010-2015:  G-CSC, Goethe University Frankfurt
       3              :  * Author: Sebastian Reiter
       4              :  * 
       5              :  * This file is part of UG4.
       6              :  * 
       7              :  * UG4 is free software: you can redistribute it and/or modify it under the
       8              :  * terms of the GNU Lesser General Public License version 3 (as published by the
       9              :  * Free Software Foundation) with the following additional attribution
      10              :  * requirements (according to LGPL/GPL v3 §7):
      11              :  * 
      12              :  * (1) The following notice must be displayed in the Appropriate Legal Notices
      13              :  * of covered and combined works: "Based on UG4 (www.ug4.org/license)".
      14              :  * 
      15              :  * (2) The following notice must be displayed at a prominent place in the
      16              :  * terminal output of covered works: "Based on UG4 (www.ug4.org/license)".
      17              :  * 
      18              :  * (3) The following bibliography is recommended for citation and must be
      19              :  * preserved in all covered files:
      20              :  * "Reiter, S., Vogel, A., Heppner, I., Rupp, M., and Wittum, G. A massively
      21              :  *   parallel geometric multigrid solver on hierarchically distributed grids.
      22              :  *   Computing and visualization in science 16, 4 (2013), 151-164"
      23              :  * "Vogel, A., Reiter, S., Rupp, M., Nägel, A., and Wittum, G. UG4 -- a novel
      24              :  *   flexible software system for simulating pde based models on high performance
      25              :  *   computers. Computing and visualization in science 16, 4 (2013), 165-179"
      26              :  * 
      27              :  * This program is distributed in the hope that it will be useful,
      28              :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      29              :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
      30              :  * GNU Lesser General Public License for more details.
      31              :  */
      32              : 
      33              : #include <cmath>
      34              : #include "subdivision_rules_piecewise_loop.h"
      35              : 
      36              : using namespace std;
      37              : 
      38              : namespace ug
      39              : {
      40              : 
      41            0 : SubdivRules_PLoop::
      42              : SubdivRules_PLoop()
      43              : {
      44              : //      precalculate betas
      45              : //      the number is quite arbitrary here.
      46              :         size_t numPrecals = 16;
      47            0 :         m_betas.resize(numPrecals);
      48            0 :         for(size_t i = 0; i < numPrecals; ++i)
      49            0 :                 m_betas[i] = calculate_beta(i);
      50            0 : }
      51              : 
      52            0 : SubdivRules_PLoop::
      53              : SubdivRules_PLoop(const SubdivRules_PLoop& src)
      54              : {
      55              : //      since this method won't ever be executed it can stay empty
      56            0 : }
      57              : 
      58            0 : SubdivRules_PLoop& SubdivRules_PLoop::
      59              : operator=(const SubdivRules_PLoop& src)
      60              : {
      61              : //      since this method won't ever be executed it can stay empty
      62            0 :         return *this;
      63              : }
      64              : 
      65              : 
      66            0 : number SubdivRules_PLoop::
      67              : get_beta(size_t valency) const
      68              : {
      69            0 :         if(valency < m_betas.size())
      70            0 :                 return m_betas[valency];
      71              :                 
      72            0 :         return calculate_beta(valency);
      73              : }
      74              : 
      75            0 : number SubdivRules_PLoop::
      76              : calculate_beta(size_t valency) const
      77              : {
      78            0 :         if(valency == 6)
      79              :                 return 0.0625;
      80              :                 
      81            0 :         if(valency > 0){
      82            0 :                 const number tmp = 0.375 + 0.25 * cos((2.0*PI)/(number)valency);
      83            0 :                 return (0.625 - tmp*tmp)/(number)valency;
      84              :         }
      85              : 
      86              :         return 0;
      87              : }
      88              : 
      89              : 
      90              : }//     end of namespace