A thread collecting samples at regular intervals. More...

#include <qwt_sampling_thread.h>

Inheritance diagram for QwtSamplingThread:

Classes
class	PrivateData

Public Slots
void	setInterval (double interval)
	Change the interval (in ms), when sample() is called.

void	stop ()
	Terminate the collecting thread.

Public Member Functions
virtual	~QwtSamplingThread ()
	Destructor.

double	interval () const

double	elapsed () const

Protected Member Functions
	QwtSamplingThread (QObject *parent=NULL)
	Constructor.

virtual void	run () QWT_OVERRIDE
	Loop collecting samples started from QThread::start()

virtual void	sample (double elapsed)=0
	Collect a sample.

Detailed Description

A thread collecting samples at regular intervals.

Continuous signals are converted into a discrete signal by collecting samples at regular intervals. A discrete signal can be displayed by a QwtPlotSeriesItem on a QwtPlot widget.

QwtSamplingThread starts a thread calling periodically sample(), to collect and store ( or emit ) a single sample.

See also: QwtPlotCurve, QwtPlotSeriesItem

Member Function Documentation

◆ elapsed()

double QwtSamplingThread::elapsed ( ) const

Returns: Time (in ms) since the thread was started

See also: QThread::start(), run()

◆ interval()

double QwtSamplingThread::interval ( ) const

Returns: Interval (in ms), between 2 calls of sample()

See also: setInterval()

◆ run()

void QwtSamplingThread::run ( )

protectedvirtual

Loop collecting samples started from QThread::start()

See also: stop()

◆ sample()

virtual void QwtSamplingThread::sample ( double elapsed )

protectedpure virtual

Collect a sample.

Parameters

elapsed Time since the thread was started in seconds

Note: Due to a bug in previous version elapsed was passed as seconds instead of miliseconds. To avoid breaking existing code we stay with seconds for now.

◆ setInterval

void QwtSamplingThread::setInterval ( double msecs )

slot

Change the interval (in ms), when sample() is called.

The default interval is 1000.0 ( = 1s )

Parameters

msecs Interval

See also: interval()

◆ stop

void QwtSamplingThread::stop ( )

slot

Terminate the collecting thread.

See also: QThread::start(), run()

The documentation for this class was generated from the following files:

/home/runner/work/QWT/QWT/src/qwt_sampling_thread.h
/home/runner/work/QWT/QWT/src/qwt_sampling_thread.cpp

Classes

Public Slots

Public Member Functions

Protected Member Functions