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Qwt User's Guide 6.3.0
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A thread collecting samples at regular intervals. More...
#include <qwt_sampling_thread.h>
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 |
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.
Definition at line 28 of file qwt_sampling_thread.h.
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virtual |
Destructor.
Definition at line 29 of file qwt_sampling_thread.cpp.
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explicitprotected |
Constructor.
Definition at line 21 of file qwt_sampling_thread.cpp.
| double QwtSamplingThread::elapsed | ( | ) | const |
Definition at line 62 of file qwt_sampling_thread.cpp.
| double QwtSamplingThread::interval | ( | ) | const |
Definition at line 53 of file qwt_sampling_thread.cpp.
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overrideprotectedvirtual |
Loop collecting samples started from QThread::start()
Definition at line 83 of file qwt_sampling_thread.cpp.
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protectedpure virtual |
Collect a sample
| elapsed | Time since the thread was started in seconds |
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slot |
Change the interval (in ms), when sample() is called. The default interval is 1000.0 ( = 1s )
| msecs | Interval |
Definition at line 41 of file qwt_sampling_thread.cpp.
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slot |
Terminate the collecting thread
Definition at line 74 of file qwt_sampling_thread.cpp.