NAME

       QwtSamplingThread -

       A thread collecting samples at regular intervals.

SYNOPSIS

       #include <qwt_sampling_thread.h>

   Public Slots
       void setInterval (double interval)
       void stop ()

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

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

Detailed Description

       A thread collecting samples at regular intervals.

       Contiounous 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 perodically sample(), to collect and store ( or
       emit ) a single sample.

       See also:
           QwtPlotCurve, QwtPlotSeriesItem

Constructor & Destructor Documentation

   QwtSamplingThread::~QwtSamplingThread () [virtual]
       Destructor.

   QwtSamplingThread::QwtSamplingThread (QObject *parent = NULL) [explicit, protected]
       Constructor.

Member Function Documentation

   double QwtSamplingThread::elapsed () const Returns:
           Time (in ms) since the thread was started

       See also:
           QThread::start(), run()

   double QwtSamplingThread::interval () const Returns:
           Interval (in ms), between 2 calls of sample()

       See also:
           setInterval()

   void QwtSamplingThread::run () [protected, virtual] Loop collecting samples started from
       QThread::start()
       See also:
           stop()

   virtual void QwtSamplingThread::sample (doubleelapsed) [protected, pure virtual] Collect a
       sample
       Parameters:
           elapsed Time since the thread was started in miliseconds

   void QwtSamplingThread::setInterval (doubleinterval) [slot] Change the interval (in ms), when
       sample() is called. The default interval is 1000.0 ( = 1s )
       Parameters:
           interval Interval

       See also:
           interval()

   void QwtSamplingThread::stop () [slot] Terminate the collecting thread
       See also:
           QThread::start(), run()

Author

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