////  SimpleMovingAverage.cpp//  libraries/shared/src////  Created by Stephen Birarda on 4/18/13.//  Copyright 2013 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include "SimpleMovingAverage.h" #include "SharedUtil.h" SimpleMovingAverage::SimpleMovingAverage(int numSamplesToAverage) :    _numSamples(0),    _lastEventTimestamp(0),    _average(0.0f),    _eventDeltaAverage(0.0f),    WEIGHTING(1.0f / numSamplesToAverage),    ONE_MINUS_WEIGHTING(1 - WEIGHTING) {} SimpleMovingAverage::SimpleMovingAverage(const SimpleMovingAverage& other) {    *this = other;} SimpleMovingAverage& SimpleMovingAverage::operator=(const SimpleMovingAverage& other) {    _numSamples = (int)other._numSamples;    _lastEventTimestamp = (uint64_t)other._lastEventTimestamp;    _average = (float)other._average;    _eventDeltaAverage = (float)other._eventDeltaAverage;    WEIGHTING = other.WEIGHTING;    ONE_MINUS_WEIGHTING = other.ONE_MINUS_WEIGHTING;    return *this;}  int SimpleMovingAverage::updateAverage(float sample) {    if (_numSamples > 0) {        _average = (ONE_MINUS_WEIGHTING * _average) + (WEIGHTING * sample);         float eventDelta = (usecTimestampNow() - _lastEventTimestamp) / 1000000.0f;         if (_numSamples > 1) {            _eventDeltaAverage = (ONE_MINUS_WEIGHTING * _eventDeltaAverage) +                (WEIGHTING * eventDelta);        } else {            _eventDeltaAverage = eventDelta;        }    } else {        _average = sample;        _eventDeltaAverage = 0;    }        _lastEventTimestamp =  usecTimestampNow();        return ++_numSamples;} void SimpleMovingAverage::reset() {    _numSamples = 0;    _average = 0.0f;    _eventDeltaAverage = 0.0f;} float SimpleMovingAverage::getEventDeltaAverage() const {    return (ONE_MINUS_WEIGHTING * _eventDeltaAverage) +        (WEIGHTING * ((usecTimestampNow() - _lastEventTimestamp) / 1000000.0f));} uint64_t SimpleMovingAverage::getUsecsSinceLastEvent() const {    return usecTimestampNow() - _lastEventTimestamp; }