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examples/oscilloscope/SamplingThread.cpp

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