averageFilter.hpp

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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 http://mozilla.org/MPL/2.0/.
 */
#pragma once
 
#include "okapi/api/filter/filter.hpp"
#include <array>
#include <cstddef>
 
namespace okapi {
template <std::size_t n> class AverageFilter : public Filter {
  public:
  AverageFilter() = default;
 
  double filter(const double ireading) override {
    data[index++] = ireading;
    if (index >= n) {
      index = 0;
    }
 
    output = 0.0;
    for (size_t i = 0; i < n; i++)
      output += data[i];
    output /= (double)n;
 
    return output;
  }
 
  double getOutput() const override {
    return output;
  }
 
  protected:
  std::array<double, n> data{0};
  std::size_t index = 0;
  double output = 0;
};
} // namespace okapi