AveragePosition.h

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//                   OpenMS -- Open-Source Mass Spectrometry
// --------------------------------------------------------------------------
// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
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// $Maintainer: Timo Sachsenberg $
// $Authors: $
// --------------------------------------------------------------------------
 
#pragma once
 
#include <OpenMS/DATASTRUCTURES/DPosition.h>
 
namespace OpenMS
{
 
  namespace Math
  {
    template <UInt D>
    class AveragePosition
    {
public:
 
      enum
      {
        DIMENSION = D
      };
 
      typedef DPosition<DIMENSION> PositionType;
 
      typedef typename PositionType::CoordinateType CoordinateType;
 
public:
 
      AveragePosition() :
        position_(),
        position_weighted_sum_(),
        weight_sum_()
      {
      }
 
      AveragePosition(AveragePosition const & rhs) :
        position_(rhs.position_),
        position_weighted_sum_(rhs.position_weighted_sum_),
        weight_sum_(rhs.weight_sum_)
      {
      }
 
      PositionType const & getPosition() const
      {
        return position_;
      }
 
      CoordinateType const & getWeight() const
      {
        return weight_sum_;
      }
 
      void clear()
      {
        position_.clear();
        position_weighted_sum_.clear();
        weight_sum_ = 0;
        return;
      }
 
      void add(PositionType position, CoordinateType const weight = 1)
      {
 
        weight_sum_ += weight;
        position *= weight;
        position_weighted_sum_ += position;
 
        // if the sum of weights is 0, set all coordinates to zero as well
        if (weight_sum_ == 0)
        {
          position_.clear();
        }
        else
        {
          position_ = position_weighted_sum_;
          position_ /= weight_sum_;
        }
        return;
      }
 
protected:
 
      PositionType position_;
      PositionType position_weighted_sum_;
      CoordinateType weight_sum_;
 
    };
 
  }   // namespace Math
 
} // namespace OpenMS