QwtSamplingThread(3)           Qwt User's Guide           QwtSamplingThread(3)

NAME
       QwtSamplingThread - 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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       code.

Version 6.2.0                   Sun Jul 18 2021           QwtSamplingThread(3)