QwtSamplingThread类 参考

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

#include <qwt_sampling_thread.h>

类 QwtSamplingThread 继承关系图:

类
class	PrivateData

Public 槽
void	setInterval (double interval)
	Change the interval (in ms), when sample() is called.
void	stop ()
	Terminate the collecting thread

Public 成员函数
double	interval () const
	Get the interval (in ms), between 2 calls of sample()
double	elapsed () const
	Get the time (in ms) since the thread was started

Protected 成员函数
	QwtSamplingThread (QObject *parent=nullptr)
	Constructor
virtual void	run () override
	Run the thread
virtual void	sample (double elapsed)=0
	Collect a sample

详细描述

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.

参见

QwtPlotCurve, QwtPlotSeriesItem

构造及析构函数说明

QwtSamplingThread()

QwtSamplingThread::QwtSamplingThread ( QObject *  parent = nullptr )

explicitprotected

Constructor

参数

parent

Parent object

Destructor

成员函数说明

elapsed()

double QwtSamplingThread::elapsed

(

)

const

Get the time (in ms) since the thread was started

返回

Elapsed time in milliseconds

参见

QThread::start(), run()

interval()

double QwtSamplingThread::interval

(

)

const

Get the interval (in ms), between 2 calls of sample()

返回

Interval in milliseconds

参见

setInterval()

run()

void QwtSamplingThread::run ( )

overrideprotectedvirtual

Run the thread

Loop collecting samples started from QThread::start()

参见

stop()

sample()

virtual void QwtSamplingThread::sample ( double  elapsed )

protectedpure virtual

Collect a sample

参数

elapsed

Time since the thread was started in seconds

注解

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 )

参数

msecs

Interval

参见

interval()

stop

void QwtSamplingThread::stop ( )

slot

Terminate the collecting thread

参见

QThread::start(), run()

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该类的文档由以下文件生成:

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