QwtSamplingThread Class Reference

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)
void	stop ()

Public Member Functions
double	elapsed () const
double	interval () const
virtual	~QwtSamplingThread ()
	Destructor. More...

Protected Member Functions
	QwtSamplingThread (QObject *parent=NULL)
	Constructor. More...
virtual void	run ()
virtual void	sample (double elapsed)=0

Private Attributes
PrivateData *	d_data

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

Definition at line 19 of file qwt_sampling_thread.h.

Constructor & Destructor Documentation

QwtSamplingThread::~QwtSamplingThread ( )

virtual

Destructor.

Definition at line 33 of file qwt_sampling_thread.cpp.

QwtSamplingThread::QwtSamplingThread ( QObject *  parent = NULL )

explicitprotected

Constructor.

Definition at line 24 of file qwt_sampling_thread.cpp.

Member Function Documentation

double QwtSamplingThread::elapsed

(

)

const

Returns

Time (in ms) since the thread was started

See also

QThread::start(), run()

Definition at line 66 of file qwt_sampling_thread.cpp.

double QwtSamplingThread::interval

(

)

const

Returns

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

See also

setInterval()

Definition at line 57 of file qwt_sampling_thread.cpp.

void QwtSamplingThread::run ( )

protectedvirtual

Loop collecting samples started from QThread::start()

See also

stop()

Definition at line 87 of file qwt_sampling_thread.cpp.

virtual void QwtSamplingThread::sample ( double  elapsed )

protectedpure virtual

Collect a sample

Parameters

elapsed

Time since the thread was started in milliseconds

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()

Definition at line 45 of file qwt_sampling_thread.cpp.

void QwtSamplingThread::stop ( )

slot

Terminate the collecting thread

See also

QThread::start(), run()

Definition at line 78 of file qwt_sampling_thread.cpp.

Member Data Documentation

PrivateData* QwtSamplingThread::d_data

private

Definition at line 46 of file qwt_sampling_thread.h.

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

• qwt_sampling_thread.h
• qwt_sampling_thread.cpp