/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors: Juha Kauppinen, Mika Hokkanen

* 

* Description: Photo Browser

*

*/

#include "IESensorDataFilter.h"

CIESensorDataFilter::CIESensorDataFilter()

    {

    // No implementation required

    }

CIESensorDataFilter::~CIESensorDataFilter()

    {

    delete iRingBuffer;

    }

CIESensorDataFilter* CIESensorDataFilter::NewLC()

    {

    CIESensorDataFilter* self = new (ELeave) CIESensorDataFilter();

    CleanupStack::PushL(self);

    self->ConstructL();

    return self;

    }

CIESensorDataFilter* CIESensorDataFilter::NewL()

    {

    CIESensorDataFilter* self = CIESensorDataFilter::NewLC();

    CleanupStack::Pop(); // self;

    return self;

    }

void CIESensorDataFilter::ConstructL()

    {

    iRingBuffer = new (ELeave) TInt[KDataBufferSize];

    memset(iRingBuffer, '\0', KDataBufferSize * sizeof (TInt));

    iRingBufferPointer = iRingBuffer;

    }

TInt CIESensorDataFilter::FilterSensorData(TInt aNewValue)

    {

    // Returns the average of the measures inside the circular buffer avoiding the noise  

    *iRingBufferPointer = aNewValue;

    iRingBufferPointer++;

    if(iRingBufferPointer >= (iRingBuffer + (KDataBufferSize - 1 )))

        {

        iRingBufferPointer = iRingBuffer;

        }

    TInt sum = 0;

    for (TInt i = 0; i < KDataBufferSize; i++ )

        {

        sum = sum + iRingBuffer[i];

        }

    return (sum / KDataBufferSize);

    }