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<div id="projectname">Qwt User's Guide <span id="projectnumber">6.0.1</span></div>
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<h1>QwtSamplingThread Class Reference</h1> </div>
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<!-- doxytag: class="QwtSamplingThread" -->
<p>A thread collecting samples at regular intervals.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="qwt__sampling__thread_8h_source.html">qwt_sampling_thread.h</a>></code></p>
<p><a href="class_qwt_sampling_thread-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-slots"></a>
Public Slots</h2></td></tr>
<tr><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 interval)</td></tr>
<tr><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>
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#a27ebf049b4fc423bdb172d9036eb6683">elapsed</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#a4a2f5038c02c8cad5ebc1fae01480e73">interval</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#a7a0b4d5c172f2ded5f6b6483c6ab56e5">~QwtSamplingThread</a> ()</td></tr>
<tr><td colspan="2"><h2><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#afb02e4696306d5211b4b6470410afbfc">QwtSamplingThread</a> (QObject *parent=NULL)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_sampling_thread.html#a247354fcc8e2597e105d87a2cfaa0a96">run</a> ()</td></tr>
<tr><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 elapsed)=0</td></tr>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>A thread collecting samples at regular intervals. </p>
<p>Contiounous 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="Class template 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>
<p><a class="el" href="class_qwt_sampling_thread.html" title="A thread collecting samples at regular intervals.">QwtSamplingThread</a> starts a thread calling perodically <a class="el" href="class_qwt_sampling_thread.html#a67c4a524736808dc1ba3b81670c0cbd5">sample()</a>, to collect and store ( or emit ) a single sample.</p>
<dl class="see"><dt><b>See also:</b></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="Class template for plot items representing a series of samples.">QwtPlotSeriesItem</a> </dd></dl>
</div><hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="a7a0b4d5c172f2ded5f6b6483c6ab56e5"></a><!-- doxytag: member="QwtSamplingThread::~QwtSamplingThread" ref="a7a0b4d5c172f2ded5f6b6483c6ab56e5" args="()" -->
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<td class="memname">QwtSamplingThread::~QwtSamplingThread </td>
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<td class="paramname"></td><td>)</td>
<td><code> [virtual]</code></td>
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<p>Destructor. </p>
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<a class="anchor" id="afb02e4696306d5211b4b6470410afbfc"></a><!-- doxytag: member="QwtSamplingThread::QwtSamplingThread" ref="afb02e4696306d5211b4b6470410afbfc" args="(QObject *parent=NULL)" -->
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<td class="memname">QwtSamplingThread::QwtSamplingThread </td>
<td>(</td>
<td class="paramtype">QObject * </td>
<td class="paramname"><em>parent</em> = <code>NULL</code></td><td>)</td>
<td><code> [explicit, protected]</code></td>
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<p>Constructor. </p>
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<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a27ebf049b4fc423bdb172d9036eb6683"></a><!-- doxytag: member="QwtSamplingThread::elapsed" ref="a27ebf049b4fc423bdb172d9036eb6683" args="() const " -->
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<td class="memname">double QwtSamplingThread::elapsed </td>
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<td class="paramname"></td><td>)</td>
<td> const</td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Time (in ms) since the thread was started </dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd>QThread::start(), <a class="el" href="class_qwt_sampling_thread.html#a247354fcc8e2597e105d87a2cfaa0a96">run()</a> </dd></dl>
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<a class="anchor" id="a4a2f5038c02c8cad5ebc1fae01480e73"></a><!-- doxytag: member="QwtSamplingThread::interval" ref="a4a2f5038c02c8cad5ebc1fae01480e73" args="() const " -->
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<td class="memname">double QwtSamplingThread::interval </td>
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<td> const</td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Interval (in ms), between 2 calls of <a class="el" href="class_qwt_sampling_thread.html#a67c4a524736808dc1ba3b81670c0cbd5">sample()</a> </dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_sampling_thread.html#a36c56404ef0042cf52f1e592edf94f5d">setInterval()</a> </dd></dl>
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<a class="anchor" id="a247354fcc8e2597e105d87a2cfaa0a96"></a><!-- doxytag: member="QwtSamplingThread::run" ref="a247354fcc8e2597e105d87a2cfaa0a96" args="()" -->
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<td class="memname">void QwtSamplingThread::run </td>
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<td class="paramname"></td><td>)</td>
<td><code> [protected, virtual]</code></td>
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<p>Loop collecting samples started from QThread::start() </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_sampling_thread.html#ac644ff417342617a39dbd86e50d09132">stop()</a> </dd></dl>
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<a class="anchor" id="a67c4a524736808dc1ba3b81670c0cbd5"></a><!-- doxytag: member="QwtSamplingThread::sample" ref="a67c4a524736808dc1ba3b81670c0cbd5" args="(double elapsed)=0" -->
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<td class="memname">virtual void QwtSamplingThread::sample </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>elapsed</em></td><td>)</td>
<td><code> [protected, pure virtual]</code></td>
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<p>Collect a sample</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">elapsed</td><td>Time since the thread was started in miliseconds </td></tr>
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</dd>
</dl>
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<a class="anchor" id="a36c56404ef0042cf52f1e592edf94f5d"></a><!-- doxytag: member="QwtSamplingThread::setInterval" ref="a36c56404ef0042cf52f1e592edf94f5d" args="(double interval)" -->
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<td class="memname">void QwtSamplingThread::setInterval </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>interval</em></td><td>)</td>
<td><code> [slot]</code></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>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">interval</td><td>Interval </td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_sampling_thread.html#a4a2f5038c02c8cad5ebc1fae01480e73">interval()</a> </dd></dl>
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<a class="anchor" id="ac644ff417342617a39dbd86e50d09132"></a><!-- doxytag: member="QwtSamplingThread::stop" ref="ac644ff417342617a39dbd86e50d09132" args="()" -->
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<td class="memname">void QwtSamplingThread::stop </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td><code> [slot]</code></td>
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<p>Terminate the collecting thread </p>
<dl class="see"><dt><b>See also:</b></dt><dd>QThread::start(), <a class="el" href="class_qwt_sampling_thread.html#a247354fcc8e2597e105d87a2cfaa0a96">run()</a> </dd></dl>
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