59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
/*****************************************************************************
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* Qwt Examples - Copyright (C) 2002 Uwe Rathmann
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* This file may be used under the terms of the 3-clause BSD License
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*****************************************************************************/
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#include "SamplingThread.h"
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#include "SignalData.h"
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#include <QwtMath>
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#include <qmath.h>
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SamplingThread::SamplingThread( QObject* parent )
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: QwtSamplingThread( parent )
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, m_frequency( 5.0 )
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, m_amplitude( 20.0 )
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{
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}
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void SamplingThread::setFrequency( double frequency )
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{
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m_frequency = frequency;
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}
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double SamplingThread::frequency() const
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{
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return m_frequency;
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}
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void SamplingThread::setAmplitude( double amplitude )
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{
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m_amplitude = amplitude;
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}
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double SamplingThread::amplitude() const
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{
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return m_amplitude;
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}
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void SamplingThread::sample( double elapsed )
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{
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if ( m_frequency > 0.0 )
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{
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const QPointF s( elapsed, value( elapsed ) );
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SignalData::instance().append( s );
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}
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}
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double SamplingThread::value( double timeStamp ) const
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{
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const double period = 1.0 / m_frequency;
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const double x = std::fmod( timeStamp, period );
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const double v = m_amplitude * qFastSin( x / period * 2 * M_PI );
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return v;
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}
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#include "moc_SamplingThread.cpp"
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