AveragePosition.h

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// $Maintainer: Clemens Groepl $
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#ifndef OPENMS_MATH_STATISTICS_AVERAGEPOSITION_H
#define OPENMS_MATH_STATISTICS_AVERAGEPOSITION_H

#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

#endif //  OPENMS_MATH_STATISTICS_AVERAGEPOSITION_H