src/Units/System.cpp

   1 /*
   2 Copyright_License {
   3
   4   XCSoar Glide Computer - http://www.xcsoar.org/
   5   Copyright (C) 2000-2013 The XCSoar Project
   6   A detailed list of copyright holders can be found in the file "AUTHORS".
   7
   8   This program is free software; you can redistribute it and/or
   9   modify it under the terms of the GNU General Public License
  10   as published by the Free Software Foundation; either version 2
  11   of the License, or (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21 }
  22 */
  23
  24 #include "Units/System.hpp"
  25 #include "Units/Descriptor.hpp"
  26
  27 fixed
  28 Units::ToUserUnit(fixed value, Unit unit)
  29 {
  30   const UnitDescriptor *ud = &unit_descriptors[(unsigned)unit];
  31   return value * ud->factor_to_user + ud->offset_to_user;
  32 }
  33
  34 fixed
  35 Units::ToSysUnit(fixed value, Unit unit)
  36 {
  37   const UnitDescriptor *ud = &unit_descriptors[(unsigned)unit];
  38   return (value - ud->offset_to_user) / ud->factor_to_user;
  39 }