QwtSamplingThread man page

QwtSamplingThread —

A thread collecting samples at regular intervals.

Synopsis

#include <qwt_sampling_thread.h>

Inherits QThread.

Public Slots

void setInterval (double interval)

void stop ()

Public Member Functions

virtual ~QwtSamplingThread ()
Destructor.
double interval () const

double elapsed () const

Protected Member Functions

QwtSamplingThread (QObject *parent=NULL)
Constructor.
virtual void run ()

virtual void sample (double elapsed)=0

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

double QwtSamplingThread::elapsed () const

Returns:

Time (in ms) since the thread was started

See Also:

QThread::start(), run()

double QwtSamplingThread::interval () const

Returns:

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

See Also:

setInterval()

void QwtSamplingThread::run () [protected], [virtual]

Loop collecting samples started from QThread::start()

See Also:

stop()

virtual void QwtSamplingThread::sample (doubleelapsed) [protected], [pure virtual]

Collect a sample

Parameters:

elapsed Time since the thread was started in milliseconds

void QwtSamplingThread::setInterval (doubleinterval) [slot]

Change the interval (in ms), when sample() is called. The default interval is 1000.0 ( = 1s )

Parameters:

interval Interval

See Also:

interval()

void QwtSamplingThread::stop () [slot]

Terminate the collecting thread

See Also:

QThread::start(), run()

Author

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Info

Thu Dec 11 2014 Version 6.1.2 Qwt User's Guide