timeseries.h

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/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */
 
#ifndef PJ_TIMESERIES_H
#define PJ_TIMESERIES_H
 
#include "plotdatabase.h"
#include <algorithm>
 
namespace PJ
{
template <typename Value>
class TimeseriesBase : public PlotDataBase<double, Value>
{
protected:
  double _max_range_x;
  using PlotDataBase<double, Value>::_points;
 
public:
  using Point = typename PlotDataBase<double, Value>::Point;
 
  TimeseriesBase(const std::string& name, PlotGroup::Ptr group)
    : PlotDataBase<double, Value>(name, group)
    , _max_range_x(std::numeric_limits<double>::max())
  {
  }
 
  TimeseriesBase(const TimeseriesBase& other) = delete;
  TimeseriesBase(TimeseriesBase&& other) = default;
 
  TimeseriesBase& operator=(const TimeseriesBase& other) = delete;
  TimeseriesBase& operator=(TimeseriesBase&& other) = default;
 
  virtual bool isTimeseries() const override
  {
    return true;
  }
 
  void setMaximumRangeX(double max_range)
  {
    _max_range_x = max_range;
    trimRange();
  }
 
  double maximumRangeX() const
  {
    return _max_range_x;
  }
 
  int getIndexFromX(double x) const;
 
  std::optional<Value> getYfromX(double x) const
  {
    int index = getIndexFromX(x);
    return (index < 0) ? std::nullopt : std::optional(_points[index].y);
  }
 
  void pushBack(const Point& p) override
  {
    auto temp = p;
    pushBack(std::move(temp));
  }
 
  void pushBack(Point&& p) override
  {
    bool need_sorting = (!_points.empty() && p.x < this->back().x);
 
    if (need_sorting)
    {
      auto it = std::upper_bound(_points.begin(), _points.end(), p,
                                 [](const auto& a, const auto& b) { return a.x < b.x; });
      PlotDataBase<double, Value>::insert(it, std::move(p));
    }
    else
    {
      PlotDataBase<double, Value>::pushBack(std::move(p));
    }
    trimRange();
  }
 
private:
  void trimRange()
  {
    if (_max_range_x < std::numeric_limits<double>::max() && !_points.empty())
    {
      auto const back_point_x = _points.back().x;
      while (_points.size() > 2 && (back_point_x - _points.front().x) > _max_range_x)
      {
        this->popFront();
      }
    }
  }
 
  static bool TimeCompare(const Point& a, const Point& b)
  {
    return a.x < b.x;
  }
};
 
//--------------------
 
template <typename Value>
inline int TimeseriesBase<Value>::getIndexFromX(double x) const
{
  if (_points.size() == 0)
  {
    return -1;
  }
  auto lower =
      std::lower_bound(_points.begin(), _points.end(), Point(x, {}), TimeCompare);
  auto index = std::distance(_points.begin(), lower);
 
  if (index >= _points.size())
  {
    return _points.size() - 1;
  }
  if (index < 0)
  {
    return 0;
  }
 
  if (index > 0 && (abs(_points[index - 1].x - x) < abs(_points[index].x - x)))
  {
    index = index - 1;
  }
  return index;
}
 
}  // namespace PJ
 
#endif