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33fc476d89
* require qwt >=6.2 (and fallback to internal 6.3 if system's qwt doesn't suffice) * debian doesn't have qwt for Qt6 and won't have it for trixie
111 lines
2.5 KiB
C++
111 lines
2.5 KiB
C++
/******************************************************************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#include "qwt_sampling_thread.h"
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#include <qelapsedtimer.h>
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class QwtSamplingThread::PrivateData
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{
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public:
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QElapsedTimer timer;
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double msecsInterval;
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};
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//! Constructor
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QwtSamplingThread::QwtSamplingThread( QObject* parent )
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: QThread( parent )
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{
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m_data = new PrivateData;
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m_data->msecsInterval = 1e3; // 1 second
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}
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//! Destructor
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QwtSamplingThread::~QwtSamplingThread()
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{
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delete m_data;
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}
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/*!
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Change the interval (in ms), when sample() is called.
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The default interval is 1000.0 ( = 1s )
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\param msecs Interval
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\sa interval()
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*/
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void QwtSamplingThread::setInterval( double msecs )
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{
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if ( msecs < 0.0 )
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msecs = 0.0;
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m_data->msecsInterval = msecs;
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}
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/*!
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\return Interval (in ms), between 2 calls of sample()
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\sa setInterval()
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*/
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double QwtSamplingThread::interval() const
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{
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return m_data->msecsInterval;
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}
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/*!
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\return Time (in ms) since the thread was started
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\sa QThread::start(), run()
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*/
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double QwtSamplingThread::elapsed() const
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{
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if ( m_data->timer.isValid() )
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return m_data->timer.nsecsElapsed() / 1e6;
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return 0.0;
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}
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/*!
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Terminate the collecting thread
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\sa QThread::start(), run()
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*/
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void QwtSamplingThread::stop()
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{
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m_data->timer.invalidate();
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}
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/*!
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Loop collecting samples started from QThread::start()
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\sa stop()
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*/
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void QwtSamplingThread::run()
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{
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m_data->timer.start();
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/*
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We should have all values in nsecs/qint64, but
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this would break existing code. TODO ...
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Anyway - for QThread::usleep we even need microseconds( usecs )
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*/
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while ( m_data->timer.isValid() )
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{
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const qint64 timestamp = m_data->timer.nsecsElapsed();
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sample( timestamp / 1e9 ); // seconds
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if ( m_data->msecsInterval > 0.0 )
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{
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const double interval = m_data->msecsInterval * 1e3;
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const double elapsed = ( m_data->timer.nsecsElapsed() - timestamp ) / 1e3;
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const double usecs = interval - elapsed;
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if ( usecs > 0.0 )
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QThread::usleep( qRound( usecs ) );
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}
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}
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}
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#include "moc_qwt_sampling_thread.cpp"
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