#include "samplingthread.h" #include "signaldata.h" #include <qwt_math.h> #include <math.h> #if QT_VERSION < 0x040600 #define qFastSin(x) ::sin(x) #endif SamplingThread::SamplingThread(QObject *parent): QwtSamplingThread(parent), d_frequency(5.0), d_amplitude(20.0) { } void SamplingThread::setFrequency(double frequency) { d_frequency = frequency; } double SamplingThread::frequency() const { return d_frequency; } void SamplingThread::setAmplitude(double amplitude) { d_amplitude = amplitude; } double SamplingThread::amplitude() const { return d_amplitude; } void SamplingThread::sample(double elapsed) { if ( d_frequency > 0.0 ) { const QPointF s(elapsed, value(elapsed)); SignalData::instance().append(s); } } double SamplingThread::value(double timeStamp) const { const double period = 1.0 / d_frequency; const double x = ::fmod(timeStamp, period); const double v = d_amplitude * qFastSin(x / period * 2 * M_PI); return v; }