QwtSamplingThread Class Reference

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

#include <qwt_sampling_thread.h>

List of all members.

Classes
class	PrivateData
Public Slots
void	setInterval (double interval)
void	stop ()
Public Member Functions
double	elapsed () const
double	interval () const
virtual	~QwtSamplingThread ()
	Destructor.
Protected Member Functions
	QwtSamplingThread (QObject *parent=NULL)
	Constructor.
virtual void	run ()
virtual void	sample (double elapsed)=0
Private Attributes
PrivateData *	d_data

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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.

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Constructor & Destructor Documentation

QwtSamplingThread::~QwtSamplingThread

(

)

[virtual]

Destructor.

Definition at line 33 of file qwt_sampling_thread.cpp.

QwtSamplingThread::QwtSamplingThread

(

QObject *

parent = NULL

)

[explicit, protected]

Constructor.

Definition at line 24 of file qwt_sampling_thread.cpp.

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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

(

)

[protected, virtual]

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

)

[protected, pure 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.

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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