107 lines
2.2 KiB
C++
107 lines
2.2 KiB
C++
|
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
|
||
|
|
* Qwt Widget Library
|
||
|
|
* Copyright (C) 1997 Josef Wilgen
|
||
|
|
* Copyright (C) 2002 Uwe Rathmann
|
||
|
|
*
|
||
|
|
* This library is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the Qwt License, Version 1.0
|
||
|
|
*****************************************************************************/
|
||
|
|
|
||
|
|
#include "qwt_sampling_thread.h"
|
||
|
|
#include "qwt_system_clock.h"
|
||
|
|
|
||
|
|
class QwtSamplingThread::PrivateData
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
QwtSystemClock clock;
|
||
|
|
|
||
|
|
double interval;
|
||
|
|
bool isStopped;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
//! Constructor
|
||
|
|
QwtSamplingThread::QwtSamplingThread( QObject *parent ):
|
||
|
|
QThread( parent )
|
||
|
|
{
|
||
|
|
d_data = new PrivateData;
|
||
|
|
d_data->interval = 1000; // 1 second
|
||
|
|
d_data->isStopped = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
//! Destructor
|
||
|
|
QwtSamplingThread::~QwtSamplingThread()
|
||
|
|
{
|
||
|
|
delete d_data;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
Change the interval (in ms), when sample() is called.
|
||
|
|
The default interval is 1000.0 ( = 1s )
|
||
|
|
|
||
|
|
\param interval Interval
|
||
|
|
\sa interval()
|
||
|
|
*/
|
||
|
|
void QwtSamplingThread::setInterval( double interval )
|
||
|
|
{
|
||
|
|
if ( interval < 0.0 )
|
||
|
|
interval = 0.0;
|
||
|
|
|
||
|
|
d_data->interval = interval;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
\return Interval (in ms), between 2 calls of sample()
|
||
|
|
\sa setInterval()
|
||
|
|
*/
|
||
|
|
double QwtSamplingThread::interval() const
|
||
|
|
{
|
||
|
|
return d_data->interval;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
\return Time (in ms) since the thread was started
|
||
|
|
\sa QThread::start(), run()
|
||
|
|
*/
|
||
|
|
double QwtSamplingThread::elapsed() const
|
||
|
|
{
|
||
|
|
if ( d_data->isStopped )
|
||
|
|
return 0.0;
|
||
|
|
|
||
|
|
return d_data->clock.elapsed();
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
Terminate the collecting thread
|
||
|
|
\sa QThread::start(), run()
|
||
|
|
*/
|
||
|
|
void QwtSamplingThread::stop()
|
||
|
|
{
|
||
|
|
d_data->isStopped = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
Loop collecting samples started from QThread::start()
|
||
|
|
\sa stop()
|
||
|
|
*/
|
||
|
|
void QwtSamplingThread::run()
|
||
|
|
{
|
||
|
|
d_data->clock.start();
|
||
|
|
d_data->isStopped = false;
|
||
|
|
|
||
|
|
while ( !d_data->isStopped )
|
||
|
|
{
|
||
|
|
const double elapsed = d_data->clock.elapsed();
|
||
|
|
sample( elapsed / 1000.0 );
|
||
|
|
|
||
|
|
if ( d_data->interval > 0.0 )
|
||
|
|
{
|
||
|
|
const double msecs =
|
||
|
|
d_data->interval - ( d_data->clock.elapsed() - elapsed );
|
||
|
|
|
||
|
|
if ( msecs > 0.0 )
|
||
|
|
usleep( qRound( 1000.0 * msecs ) );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|