source: ntrip/branches/BNC_2.12/qwt/qwt_sampling_thread.h@ 7886

Last change on this file since 7886 was 4271, checked in by mervart, 12 years ago
File size: 1.1 KB
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1#ifndef _QWT_SAMPLING_THREAD_H_
2#define _QWT_SAMPLING_THREAD_H_
3
4#include "qwt_global.h"
5#include <qthread.h>
6
7/*!
8 \brief A thread collecting samples at regular intervals.
9
10 Contiounous signals are converted into a discrete signal by
11 collecting samples at regular intervals. A discrete signal
12 can be displayed by a QwtPlotSeriesItem on a QwtPlot widget.
13
14 QwtSamplingThread starts a thread calling perodically sample(),
15 to collect and store ( or emit ) a single sample.
16
17 \sa QwtPlotCurve, QwtPlotSeriesItem
18*/
19class QWT_EXPORT QwtSamplingThread: public QThread
20{
21 Q_OBJECT
22
23public:
24 virtual ~QwtSamplingThread();
25
26 double interval() const;
27 double elapsed() const;
28
29public Q_SLOTS:
30 void setInterval( double interval );
31 void stop();
32
33protected:
34 explicit QwtSamplingThread( QObject *parent = NULL );
35
36 virtual void run();
37
38 /*!
39 Collect a sample
40
41 \param elapsed Time since the thread was started in miliseconds
42 */
43 virtual void sample( double elapsed ) = 0;
44
45private:
46 class PrivateData;
47 PrivateData *d_data;
48};
49
50#endif
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