MovingAvgFilter.h

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#ifndef MOVING_AVG_FILTER_H
#define MOVING_AVG_FILTER_H
 
#include "Filter.h"
 
template<typename T>
class MovingAvgFilter: public Filter<T> {
  public:
    MovingAvgFilter(int nsamples) {
        this->nsamples = nsamples;
        last = 0;
        total = (T)0;
        samples = new T[nsamples];
        for(int i = 0; i<nsamples; i++) samples[i] = (T)0;
    }
 
    T filter(T value) {
        total -= samples[last];
        samples[last] = value;
        total += value;
 
        if(++last >= nsamples) last = 0;
 
        return (T)(total/nsamples);
    }
    
  private:
    T total;
    T *samples;
    int nsamples, last;
};
 
#endif