// 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:

 //

 // Description:

 //

 #include "wavegenerator.h"

 #include <e32math.h>

 /**

 Generates a set of values that resembles a sine wave that has no negative 

 values.

 */

 void WaveGenerator::GenerateSineWave(TValueList& aResults, TInt aNumSamples,

         TReal aAmplitude, TReal aFrequency, TBool aPositiveValues)

     {

     TReal prefix = -1;

     TReal part = 1.0 / aNumSamples;

     TReal time = 0;

     TReal preCalculation = 3.14159265358979323846 * aFrequency;

     if (aPositiveValues)

         {

         prefix = 1;

         }

     TReal sinResult;

     for (TInt i = aNumSamples; i > 0; --i)

         {

         time += part;

         Math::Sin(sinResult, preCalculation * time);

         aResults.Append(prefix * Abs(aAmplitude * sinResult));

         }

     }