EGHModel.h

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//                   OpenMS -- Open-Source Mass Spectrometry
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// $Maintainer: Timo Sachsenberg$
// $Authors: Stephan Aiche $
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#pragma once

#include <OpenMS/TRANSFORMATIONS/FEATUREFINDER/InterpolationModel.h>
#include <OpenMS/MATH/STATISTICS/BasicStatistics.h>

namespace OpenMS
{
  class OPENMS_DLLAPI EGHModel :
    public InterpolationModel
  {

public:
    typedef InterpolationModel::CoordinateType CoordinateType;
    typedef Math::BasicStatistics<CoordinateType> BasicStatistics;
    typedef LinearInterpolation::container_type ContainerType;

    EGHModel();

    EGHModel(const EGHModel & source);

    ~EGHModel() override;

    virtual EGHModel & operator=(const EGHModel & source);

    static BaseModel<1> * create()
    {
      return new EGHModel();
    }

    static const String getProductName()
    {
      return "EGHModel";
    }

    void setOffset(CoordinateType offset) override;

    void setSamples() override;

    CoordinateType getCenter() const override;

protected:
    CoordinateType  min_;
    CoordinateType  max_;
    BasicStatistics statistics_;
    CoordinateType  height_;     // H in paper
    CoordinateType  apex_rt_;

    CoordinateType  A_;
    CoordinateType  B_;

    CoordinateType  tau_;
    CoordinateType  sigma_square_;
    CoordinateType  sigma_square_2_;


    void updateMembers_() override;

    void computeBoundaries_();

    inline void evaluateEGH_(CoordinateType & rt, CoordinateType & egh_value) const
    {
      CoordinateType denominator = sigma_square_2_ + tau_ * rt;

      if (denominator > 0)
      {
        // evaluate egh ->
        egh_value = height_ * exp(
          (-1 * rt * rt) / denominator
          );
      }
      else
      {
        egh_value = 0.0;
      }
    }

  };

} // namespace OpenMS