CWE-ou-minkata/Sources/Plasma/PubUtilLib/plMath/plAvg.h

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*==LICENSE==*/
#ifndef PL_AVG_H
#define PL_AVG_H

#include "hsConfig.h"
#include "hsThread.h"
#include "hsStlUtils.h"


// A Time based Value Averaging class
//	implemented in a ring buffer
// Values are averaged over the RingLen
//	independant of frame time
// The ring buffer will grow to accomadate
//	as many samples as added during the Len
// Only Accurate to kPercision (0.001) of whatever units
//	of time are used

template <class T> class TimeBasedAvgRing
{
/* T must be a simple type

  If T is not a floating point type then rounding
  loss may occur when samples are interpolated
  at window boundries
*/
private:
	static const float kPercision;

	template <class S> class Item
	{
	private:
		T fValue;
		double fTime;
	public:
		Item() { Reset(); }
		Item(const T val, const double time) : fValue(val), fTime(time) { }
		void Reset() { fValue = 0; fTime = 0; }
		void SetValue(const T val) { fValue = val; }
		void SetTime(const double time) { fTime = time; }
		T GetValue() const { return fValue; }
		double GetTime() const { return fTime; }
	};
	typedef std::list< Item<T> > TimeList;
	typedef typename TimeList::iterator TimeListIterator; // .NET added typename to be C++ ISO compliant - JL

	TimeList fList;
	float fLen;  // in time
	float fAvg;
	float fMaxAvg;
	double fTotal;
	TimeListIterator fRingStart, fRingEnd;
	hsMutex	fLock;
public:
	TimeBasedAvgRing():fLen(0.f),fAvg(0.f),fMaxAvg(0.f),fTotal(0.0) {}

	void SetRingLen(const float len) { fLen = len; }
	float GetRingLen() const { return fLen; }
	void AddItem(T value, double time);
	float GetAvg() const { return fAvg; }
	double GetTotal() const { return fTotal; }
	float GetMaxAvg() const { return fMaxAvg; }
	void ResetMaxAvg() { fMaxAvg=fAvg; }
	void Reset() { fRingStart=fRingEnd; ResetMaxAvg(); }
};


#endif  // PL_AVG_H