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/*==LICENSE==*
CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
You can contact Cyan Worlds, Inc. by email legal@cyan.com
or by snail mail at:
Cyan Worlds, Inc.
14617 N Newport Hwy
Mead, WA 99021
*==LICENSE==*/
#include "hsTypes.h"
#include "plAvg.h"
#include <math.h>
template class TimeBasedAvgRing<float>;
template class TimeBasedAvgRing<double>;
#define PercisionRoundUp(x) (ceil(x / kPercision) * kPercision)
template <class T>
const float TimeBasedAvgRing<T>::kPercision = 0.001;
template <class T>
void TimeBasedAvgRing<T>::AddItem(T value, double time)
{
hsTempMutexLock lock( fLock );
if ( fList.empty() )
{
// initialize with the first time and zero the first value
fList.insert(fList.end(),Item<T>(0.0,time));
fRingStart = fRingEnd = fList.begin();
fAvg = (float)value;
}
else
{
// if we're within the percision amount subtract the RingEnd value from total
// and update the RingEnd value by adding the current value to it
if (time - (*fRingEnd).GetTime() <= kPercision)
{
fTotal -= PercisionRoundUp((*fRingEnd).GetValue());
(*fRingEnd).SetValue((*fRingEnd).GetValue() + value);
}
else
{
// clean up the begining of the ring
//// there can be some precision loss in the loop time calc
//// check to see if the difference is within 1 milli
while (time - (*fRingStart).GetTime() > fLen + kPercision
&& fRingStart != fRingEnd)
{
// remove RingStart from the avg part of the average calc
fTotal -= (*fRingStart).GetValue();
TimeList::iterator prev = fRingStart++;
// loop the ring if needed
if (fRingStart == fList.end())
fRingStart = fList.begin();
// if the new ring start is in the range, interpolate
// and reuse prev
if (time - (*fRingStart).GetTime() < fLen)
{
// remove RingStart from the avg part of the average calc
fTotal -= PercisionRoundUp((*fRingStart).GetValue());
// Set up the interp
double remainder = fLen - (time - (*fRingStart).GetTime());
double timedelta = (*fRingStart).GetTime() - (*prev).GetTime();
(*prev).SetTime((*fRingStart).GetTime() - remainder);
(*prev).SetValue(0);
// rounding loss occurs here if T is not floting point
double scale = remainder/timedelta;
hsAssert(scale < 1.0 && scale > 0.0,"Interp Scale Out of Bounds");
(*fRingStart).SetValue((float)((*fRingStart).GetValue() * scale));
// add the new value in
fTotal += (*fRingStart).GetValue();
// put prev back as ring start
fRingStart = prev;
}
}
// zero total & fAvg if we looped or neg
if (fRingStart == fRingEnd || fTotal < 0.0)
{
fTotal = 0.0;
fAvg = 0.0;
}
// put the new value in the ring by expanding the ring if needed
// or replacing an empty value
fRingEnd++;
if (fRingEnd == fList.end())
fRingEnd = fList.begin();
// Do we have free space?
if (fRingEnd == fRingStart)
{
// no free space
fList.insert(fRingEnd,Item<T>(value,time));
fRingEnd--;
}
else
{
// yes free space @ fRingEnd
(*fRingEnd) = Item<T>(value,time);
}
}
//update the avg
fTotal += (*fRingEnd).GetValue();
double currentLen = (*fRingEnd).GetTime() - (*fRingStart).GetTime();
if (currentLen < 1.0)
fAvg = (float)fTotal;
else
fAvg = (float)(fTotal / currentLen);
}
// update the max avg
fMaxAvg = hsMaximum( fMaxAvg, fAvg );
}