QwtSamplingThread Class Reference

#include <qwt_sampling_thread.h>

List of all members.

Public Slots
void	setInterval (double interval)
void	stop ()
Public Member Functions
double	elapsed () const
double	interval () const
virtual	~QwtSamplingThread ()
Protected Member Functions
	QwtSamplingThread (QObject *parent=NULL)
virtual void	run ()
virtual void	sample (double elapsed)=0

---

Detailed Description

A thread collecting samples at regular intervals.

Contiounous 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 perodically sample(), to collect and store ( or emit ) a single sample.

See also:

QwtPlotCurve, QwtPlotSeriesItem

---

Constructor & Destructor Documentation

QwtSamplingThread::~QwtSamplingThread

(

)

[virtual]

Destructor.

QwtSamplingThread::QwtSamplingThread

(

QObject *

parent = NULL

)

[explicit, protected]

Constructor.

---

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

(

double

elapsed

)

[protected, pure virtual]

Collect a sample

Parameters:

elapsed

Time since the thread was started in miliseconds

void QwtSamplingThread::setInterval

(

double

interval

)

[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()