libH/Average.cpp

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/*
  
  Copyright (c) 2007, Tim Burrell
  Initial version Copyright (c) 2005, Alexander Kroeller
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at 

        http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and 
  limitations under the License. 
  
*/

#include "Average.hpp"

// Namespace

using namespace std;
using namespace H;

// Typedefs, enums, etc

// Construction

Average::Average(int Size) {
        mValues.resize(Size);
        mHeadIdx = 0;
        mSum = 0.0;
        mFillState = 0;
}

Average::~Average() {
}

// Class Body

void Average::push(double Value) {
        if (mFillState == mValues.size()) {
                mSum += Value - mValues[mHeadIdx];
                mValues[mHeadIdx] = Value;
        } else {
                ++ mFillState;
                mSum += Value;
                mValues[mHeadIdx] = Value;
        }
        mHeadIdx = (mHeadIdx + 1) % mValues.size();
}

double Average::average(void) {
   if (mFillState == 0)
      return 0.0;
   else
      return mSum / double(mFillState);
}

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