QwtSamplingThread - Man Page
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 () override
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
Definition at line 28 of file qwt_sampling_thread.h.
Member Function Documentation
double QwtSamplingThread::elapsed () const
- Returns
Time (in ms) since the thread was started
- See also
QThread::start(), run()
Definition at line 62 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 53 of file qwt_sampling_thread.cpp.
void QwtSamplingThread::run () [override], [protected], [virtual]
Loop collecting samples started from QThread::start()
- See also
stop()
Definition at line 83 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 seconds
- Note
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.
void QwtSamplingThread::setInterval (double msecs) [slot]
Change the interval (in ms), when sample() is called. The default interval is 1000.0 ( = 1s )
- Parameters
msecs Interval
- See also
interval()
Definition at line 41 of file qwt_sampling_thread.cpp.
void QwtSamplingThread::stop () [slot]
Terminate the collecting thread
- See also
QThread::start(), run()
Definition at line 74 of file qwt_sampling_thread.cpp.
Author
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