#include "gtl_math_rms.h"
#include "gtl_math.h"

namespace gtl
{
    namespace math
    {

        rms::rms(gtl::analog_data *data)
            : analog_value(data)
            , _squared_sum_value(0.)
        {
            _name = "rms";
        }

        void rms::before_copying_data(std::vector<qreal>::iterator begin, std::vector<qreal>::iterator end)
        {
            _squared_sum_value -= mathFunctions::squared_sum(begin, end);
        }

        void rms::after_copying_data(std::vector<qreal>::iterator begin, std::vector<qreal>::iterator end)
        {
            _squared_sum_value += mathFunctions::squared_sum(begin, end);
        }

        void rms::data_changed()
        {
            analog_value::data_changed();
            if(_data.size() != 0)
                _value = qSqrt(_squared_sum_value/_data.size());

            emit value_changed();
        }
   }
}