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322 lines
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<div class="title">QwtSamplingThread Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div> </div>
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<p>A thread collecting samples at regular intervals.
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<a href="class_qwt_sampling_thread.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="qwt__sampling__thread_8h_source.html">qwt_sampling_thread.h</a>></code></p>
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<div class="dynheader">
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Inheritance diagram for QwtSamplingThread:</div>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-slots"></a>
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Public Slots</h2></td></tr>
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<tr class="memitem:a36c56404ef0042cf52f1e592edf94f5d"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#a36c56404ef0042cf52f1e592edf94f5d">setInterval</a> (double <a class="el" href="class_qwt_sampling_thread.html#a4fd7b7df98159bb0daddab7709674991">interval</a>)</td></tr>
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<tr class="separator:a36c56404ef0042cf52f1e592edf94f5d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ac644ff417342617a39dbd86e50d09132"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#ac644ff417342617a39dbd86e50d09132">stop</a> ()</td></tr>
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<tr class="separator:ac644ff417342617a39dbd86e50d09132"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a7a0b4d5c172f2ded5f6b6483c6ab56e5"><td class="memItemLeft" align="right" valign="top"><a id="a7a0b4d5c172f2ded5f6b6483c6ab56e5"></a>
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virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#a7a0b4d5c172f2ded5f6b6483c6ab56e5">~QwtSamplingThread</a> ()</td></tr>
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<tr class="memdesc:a7a0b4d5c172f2ded5f6b6483c6ab56e5"><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br /></td></tr>
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<tr class="separator:a7a0b4d5c172f2ded5f6b6483c6ab56e5"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a4fd7b7df98159bb0daddab7709674991"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#a4fd7b7df98159bb0daddab7709674991">interval</a> () const</td></tr>
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<tr class="separator:a4fd7b7df98159bb0daddab7709674991"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a34514c4cd9b99228a150f002ac422771"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#a34514c4cd9b99228a150f002ac422771">elapsed</a> () const</td></tr>
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<tr class="separator:a34514c4cd9b99228a150f002ac422771"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
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Protected Member Functions</h2></td></tr>
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<tr class="memitem:afb02e4696306d5211b4b6470410afbfc"><td class="memItemLeft" align="right" valign="top"><a id="afb02e4696306d5211b4b6470410afbfc"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#afb02e4696306d5211b4b6470410afbfc">QwtSamplingThread</a> (QObject *parent=NULL)</td></tr>
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<tr class="memdesc:afb02e4696306d5211b4b6470410afbfc"><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <br /></td></tr>
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<tr class="separator:afb02e4696306d5211b4b6470410afbfc"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a08926a89be00fcccb0789ed24a56412c"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#a08926a89be00fcccb0789ed24a56412c">run</a> () override</td></tr>
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<tr class="separator:a08926a89be00fcccb0789ed24a56412c"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a67c4a524736808dc1ba3b81670c0cbd5"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#a67c4a524736808dc1ba3b81670c0cbd5">sample</a> (double <a class="el" href="class_qwt_sampling_thread.html#a34514c4cd9b99228a150f002ac422771">elapsed</a>)=0</td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>A thread collecting samples at regular intervals. </p>
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<p>Continuous signals are converted into a discrete signal by collecting samples at regular intervals. A discrete signal can be displayed by a <a class="el" href="class_qwt_plot_series_item.html" title="Base class for plot items representing a series of samples.">QwtPlotSeriesItem</a> on a <a class="el" href="class_qwt_plot.html" title="A 2-D plotting widget.">QwtPlot</a> widget.</p>
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<p><a class="el" href="class_qwt_sampling_thread.html" title="A thread collecting samples at regular intervals.">QwtSamplingThread</a> starts a thread calling periodically <a class="el" href="class_qwt_sampling_thread.html#a67c4a524736808dc1ba3b81670c0cbd5">sample()</a>, to collect and store ( or emit ) a single sample.</p>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_plot_curve.html" title="A plot item, that represents a series of points.">QwtPlotCurve</a>, <a class="el" href="class_qwt_plot_series_item.html" title="Base class for plot items representing a series of samples.">QwtPlotSeriesItem</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__sampling__thread_8h_source.html#l00028">28</a> of file <a class="el" href="qwt__sampling__thread_8h_source.html">qwt_sampling_thread.h</a>.</p>
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</div><h2 class="groupheader">Member Function Documentation</h2>
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<a id="a34514c4cd9b99228a150f002ac422771"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a34514c4cd9b99228a150f002ac422771">◆ </a></span>elapsed()</h2>
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<td class="memname">double QwtSamplingThread::elapsed </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td> const</td>
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<dl class="section return"><dt>Returns</dt><dd>Time (in ms) since the thread was started </dd></dl>
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<dl class="section see"><dt>See also</dt><dd>QThread::start(), <a class="el" href="class_qwt_sampling_thread.html#a08926a89be00fcccb0789ed24a56412c">run()</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__sampling__thread_8cpp_source.html#l00062">62</a> of file <a class="el" href="qwt__sampling__thread_8cpp_source.html">qwt_sampling_thread.cpp</a>.</p>
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<a id="a4fd7b7df98159bb0daddab7709674991"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a4fd7b7df98159bb0daddab7709674991">◆ </a></span>interval()</h2>
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<td class="memname">double QwtSamplingThread::interval </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td> const</td>
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<dl class="section return"><dt>Returns</dt><dd>Interval (in ms), between 2 calls of <a class="el" href="class_qwt_sampling_thread.html#a67c4a524736808dc1ba3b81670c0cbd5">sample()</a> </dd></dl>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_sampling_thread.html#a36c56404ef0042cf52f1e592edf94f5d">setInterval()</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__sampling__thread_8cpp_source.html#l00053">53</a> of file <a class="el" href="qwt__sampling__thread_8cpp_source.html">qwt_sampling_thread.cpp</a>.</p>
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<a id="a08926a89be00fcccb0789ed24a56412c"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a08926a89be00fcccb0789ed24a56412c">◆ </a></span>run()</h2>
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<td class="memname">void QwtSamplingThread::run </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<span class="mlabels"><span class="mlabel">override</span><span class="mlabel">protected</span><span class="mlabel">virtual</span></span> </td>
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<p>Loop collecting samples started from QThread::start() </p><dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_sampling_thread.html#ac644ff417342617a39dbd86e50d09132">stop()</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__sampling__thread_8cpp_source.html#l00083">83</a> of file <a class="el" href="qwt__sampling__thread_8cpp_source.html">qwt_sampling_thread.cpp</a>.</p>
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<a id="a67c4a524736808dc1ba3b81670c0cbd5"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a67c4a524736808dc1ba3b81670c0cbd5">◆ </a></span>sample()</h2>
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<td class="memname">virtual void QwtSamplingThread::sample </td>
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<td>(</td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>elapsed</em></td><td>)</td>
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<span class="mlabels"><span class="mlabel">protected</span><span class="mlabel">pure virtual</span></span> </td>
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<p>Collect a sample</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">elapsed</td><td>Time since the thread was started in seconds </td></tr>
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<dl class="section note"><dt>Note</dt><dd>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. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a36c56404ef0042cf52f1e592edf94f5d">◆ </a></span>setInterval</h2>
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<td class="memname">void QwtSamplingThread::setInterval </td>
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<td>(</td>
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<p>Change the interval (in ms), when <a class="el" href="class_qwt_sampling_thread.html#a67c4a524736808dc1ba3b81670c0cbd5">sample()</a> is called. The default interval is 1000.0 ( = 1s )</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">msecs</td><td>Interval </td></tr>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_sampling_thread.html#a4fd7b7df98159bb0daddab7709674991">interval()</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__sampling__thread_8cpp_source.html#l00041">41</a> of file <a class="el" href="qwt__sampling__thread_8cpp_source.html">qwt_sampling_thread.cpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac644ff417342617a39dbd86e50d09132">◆ </a></span>stop</h2>
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<td class="memname">void QwtSamplingThread::stop </td>
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<p>Terminate the collecting thread </p><dl class="section see"><dt>See also</dt><dd>QThread::start(), <a class="el" href="class_qwt_sampling_thread.html#a08926a89be00fcccb0789ed24a56412c">run()</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__sampling__thread_8cpp_source.html#l00074">74</a> of file <a class="el" href="qwt__sampling__thread_8cpp_source.html">qwt_sampling_thread.cpp</a>.</p>
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