src/Computer/ClimbAverageCalculator.hpp

   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 #ifndef CLIMBAVERAGECALCULATOR_HPP
  25 #define CLIMBAVERAGECALCULATOR_HPP
  26
  27 #include "Math/fixed.hpp"
  28
  29 class ClimbAverageCalculator
  30 {
  31   static constexpr int MAX_HISTORY = 40;
  32   struct HistoryItem
  33   {
  34     fixed time;
  35     fixed altitude;
  36
  37     HistoryItem() = default;
  38
  39     constexpr HistoryItem(fixed _time, fixed _altitude)
  40       :time(_time), altitude(_altitude) {}
  41
  42     bool IsDefined() const {
  43       return !negative(time);
  44     }
  45
  46     void Reset() {
  47       time = fixed(-1);
  48     }
  49   };
  50
  51   HistoryItem history[MAX_HISTORY];
  52   int newestValIndex;
  53
  54 public:
  55   fixed GetAverage(fixed time, fixed altitude, fixed average_time);
  56   void Reset();
  57   bool Expired(fixed now, fixed max_age) const;
  58 };
  59
  60 #endif
  61