1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/graphics/graphicstest/uibench/s60/src/tests_fonts/wavegenerator.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,44 @@
     1.4 +// Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
     1.5 +// All rights reserved.
     1.6 +// This component and the accompanying materials are made available
     1.7 +// under the terms of "Eclipse Public License v1.0"
     1.8 +// which accompanies this distribution, and is available
     1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.10 +//
    1.11 +// Initial Contributors:
    1.12 +// Nokia Corporation - initial contribution.
    1.13 +//
    1.14 +// Contributors:
    1.15 +//
    1.16 +// Description:
    1.17 +//
    1.18 +
    1.19 +
    1.20 +#include "wavegenerator.h"
    1.21 +
    1.22 +#include <e32math.h>
    1.23 +
    1.24 +
    1.25 +/**
    1.26 +Generates a set of values that resembles a sine wave that has no negative 
    1.27 +values.
    1.28 +*/
    1.29 +void WaveGenerator::GenerateSineWave(TValueList& aResults, TInt aNumSamples,
    1.30 +        TReal aAmplitude, TReal aFrequency, TBool aPositiveValues)
    1.31 +    {
    1.32 +    TReal prefix = -1;
    1.33 +    TReal part = 1.0 / aNumSamples;
    1.34 +    TReal time = 0;
    1.35 +    TReal preCalculation = 3.14159265358979323846 * aFrequency;
    1.36 +    if (aPositiveValues)
    1.37 +        {
    1.38 +        prefix = 1;
    1.39 +        }
    1.40 +    TReal sinResult;
    1.41 +    for (TInt i = aNumSamples; i > 0; --i)
    1.42 +        {
    1.43 +        time += part;
    1.44 +        Math::Sin(sinResult, preCalculation * time);
    1.45 +        aResults.Append(prefix * Abs(aAmplitude * sinResult));
    1.46 +        }
    1.47 +    }