class_qwt_synthetic_point_data.html
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<div class="title">QwtSyntheticPointData Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div> </div>
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<p>Synthetic point data.
<a href="class_qwt_synthetic_point_data.html#details">More...</a></p>
<p><code>#include <<a class="el" href="qwt__point__data_8h_source.html">qwt_point_data.h</a>></code></p>
<div class="dynheader">
Inheritance diagram for QwtSyntheticPointData:</div>
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<div class="center"><img src="class_qwt_synthetic_point_data__inherit__graph.png" border="0" usemap="#_qwt_synthetic_point_data_inherit__map" alt="Inheritance graph"/></div>
<map name="_qwt_synthetic_point_data_inherit__map" id="_qwt_synthetic_point_data_inherit__map">
<area shape="rect" id="node2" href="class_qwt_series_data.html" title="QwtSeriesData\< QPointF \>" alt="" coords="5,5,179,32"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:ad2980a20669d9703046e9ded9cacf496"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_synthetic_point_data.html#ad2980a20669d9703046e9ded9cacf496">QwtSyntheticPointData</a> (size_t <a class="el" href="class_qwt_synthetic_point_data.html#a61b2cc26e1b5fa4a64e29273cf3e1599">size</a>, const <a class="el" href="class_qwt_interval.html">QwtInterval</a> &=<a class="el" href="class_qwt_interval.html">QwtInterval</a>())</td></tr>
<tr class="separator:ad2980a20669d9703046e9ded9cacf496"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a321754c5acac77e0e5685968b1cdfdae"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_synthetic_point_data.html#a321754c5acac77e0e5685968b1cdfdae">setSize</a> (size_t <a class="el" href="class_qwt_synthetic_point_data.html#a61b2cc26e1b5fa4a64e29273cf3e1599">size</a>)</td></tr>
<tr class="separator:a321754c5acac77e0e5685968b1cdfdae"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a61b2cc26e1b5fa4a64e29273cf3e1599"><td class="memItemLeft" align="right" valign="top">virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_synthetic_point_data.html#a61b2cc26e1b5fa4a64e29273cf3e1599">size</a> () const </td></tr>
<tr class="separator:a61b2cc26e1b5fa4a64e29273cf3e1599"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a1a0b2548b496affcf65272acd86c6700"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_synthetic_point_data.html#a1a0b2548b496affcf65272acd86c6700">setInterval</a> (const <a class="el" href="class_qwt_interval.html">QwtInterval</a> &)</td></tr>
<tr class="separator:a1a0b2548b496affcf65272acd86c6700"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:acd5ffffb670778cfd714bc915615851e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_interval.html">QwtInterval</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_synthetic_point_data.html#acd5ffffb670778cfd714bc915615851e">interval</a> () const </td></tr>
<tr class="separator:acd5ffffb670778cfd714bc915615851e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a89296d373856825047f48e86d7731b0a"><td class="memItemLeft" align="right" valign="top">virtual QRectF </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_synthetic_point_data.html#a89296d373856825047f48e86d7731b0a">boundingRect</a> () const </td></tr>
<tr class="memdesc:a89296d373856825047f48e86d7731b0a"><td class="mdescLeft"> </td><td class="mdescRight">Calculate the bounding rectangle. <a href="#a89296d373856825047f48e86d7731b0a">More...</a><br/></td></tr>
<tr class="separator:a89296d373856825047f48e86d7731b0a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a70d3ed6bfd764878f1709ab6b55e2f0e"><td class="memItemLeft" align="right" valign="top">virtual QPointF </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_synthetic_point_data.html#a70d3ed6bfd764878f1709ab6b55e2f0e">sample</a> (size_t i) const </td></tr>
<tr class="separator:a70d3ed6bfd764878f1709ab6b55e2f0e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af65186bea0056b3f7f46814c61d68c99"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_synthetic_point_data.html#af65186bea0056b3f7f46814c61d68c99">y</a> (double <a class="el" href="class_qwt_synthetic_point_data.html#ab14ef450ef097f05dbb8b8d75202538b">x</a>) const =0</td></tr>
<tr class="separator:af65186bea0056b3f7f46814c61d68c99"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab14ef450ef097f05dbb8b8d75202538b"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_synthetic_point_data.html#ab14ef450ef097f05dbb8b8d75202538b">x</a> (uint index) const </td></tr>
<tr class="separator:ab14ef450ef097f05dbb8b8d75202538b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a39cc8512e7d8beecde003f7781174b84"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_synthetic_point_data.html#a39cc8512e7d8beecde003f7781174b84">setRectOfInterest</a> (const QRectF &)</td></tr>
<tr class="separator:a39cc8512e7d8beecde003f7781174b84"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a00ead6b5e6cbc06d87af6edaa518d05f"><td class="memItemLeft" align="right" valign="top">QRectF </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_synthetic_point_data.html#a00ead6b5e6cbc06d87af6edaa518d05f">rectOfInterest</a> () const </td></tr>
<tr class="separator:a00ead6b5e6cbc06d87af6edaa518d05f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_class_qwt_series_data"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_qwt_series_data')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="class_qwt_series_data.html">QwtSeriesData< QPointF ></a></td></tr>
<tr class="memitem:a3f075340d18fb112a342d74716eb8d9c inherit pub_methods_class_qwt_series_data"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3f075340d18fb112a342d74716eb8d9c"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_series_data.html#a3f075340d18fb112a342d74716eb8d9c">QwtSeriesData</a> ()</td></tr>
<tr class="memdesc:a3f075340d18fb112a342d74716eb8d9c inherit pub_methods_class_qwt_series_data"><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <br/></td></tr>
<tr class="separator:a3f075340d18fb112a342d74716eb8d9c inherit pub_methods_class_qwt_series_data"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a841a56f909879d599a385b9c3d046745 inherit pub_methods_class_qwt_series_data"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a841a56f909879d599a385b9c3d046745"></a>
virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_series_data.html#a841a56f909879d599a385b9c3d046745">~QwtSeriesData</a> ()</td></tr>
<tr class="memdesc:a841a56f909879d599a385b9c3d046745 inherit pub_methods_class_qwt_series_data"><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br/></td></tr>
<tr class="separator:a841a56f909879d599a385b9c3d046745 inherit pub_methods_class_qwt_series_data"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="inherited"></a>
Additional Inherited Members</h2></td></tr>
<tr class="inherit_header pro_attribs_class_qwt_series_data"><td colspan="2" onclick="javascript:toggleInherit('pro_attribs_class_qwt_series_data')"><img src="closed.png" alt="-"/> Protected Attributes inherited from <a class="el" href="class_qwt_series_data.html">QwtSeriesData< QPointF ></a></td></tr>
<tr class="memitem:a24fbbcb0baa0c728117d2e6764d00414 inherit pro_attribs_class_qwt_series_data"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a24fbbcb0baa0c728117d2e6764d00414"></a>
QRectF </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_series_data.html#a24fbbcb0baa0c728117d2e6764d00414">d_boundingRect</a></td></tr>
<tr class="memdesc:a24fbbcb0baa0c728117d2e6764d00414 inherit pro_attribs_class_qwt_series_data"><td class="mdescLeft"> </td><td class="mdescRight">Can be used to cache a calculated bounding rectangle. <br/></td></tr>
<tr class="separator:a24fbbcb0baa0c728117d2e6764d00414 inherit pro_attribs_class_qwt_series_data"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Synthetic point data. </p>
<p><a class="el" href="class_qwt_synthetic_point_data.html" title="Synthetic point data.">QwtSyntheticPointData</a> provides a fixed number of points for an interval. The points are calculated in equidistant steps in x-direction.</p>
<p>If the interval is invalid, the points are calculated for the "rectangle of interest", what normally is the displayed area on the plot canvas. In this mode you get different levels of detail, when zooming in/out.</p>
<dl class="section user"><dt>Example</dt><dd></dd></dl>
<p>The following example shows how to implement a sinus curve.</p>
<pre class="fragment">#include <cmath>
#include <qwt_series_data.h>
#include <qwt_plot_curve.h>
#include <qwt_plot.h>
#include <qapplication.h>
class SinusData: public QwtSyntheticPointData
{
public:
SinusData():
QwtSyntheticPointData(100)
{
}
virtual double y(double x) const
{
return qSin(x);
}
};
int main(int argc, char **argv)
{
QApplication a(argc, argv);
QwtPlot plot;
plot.setAxisScale(QwtPlot::xBottom, 0.0, 10.0);
plot.setAxisScale(QwtPlot::yLeft, -1.0, 1.0);
QwtPlotCurve *curve = new QwtPlotCurve("y = sin(x)");
curve->setData(SinusData());
curve->attach(&plot);
plot.show();
return a.exec();
}</pre> </div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
<a class="anchor" id="ad2980a20669d9703046e9ded9cacf496"></a>
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<td class="memname">QwtSyntheticPointData::QwtSyntheticPointData </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>size</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="class_qwt_interval.html">QwtInterval</a> & </td>
<td class="paramname"><em>interval</em> = <code><a class="el" href="class_qwt_interval.html">QwtInterval</a>()</code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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</div><div class="memdoc">
<p>Constructor</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">size</td><td>Number of points </td></tr>
<tr><td class="paramname">interval</td><td>Bounding interval for the points</td></tr>
</table>
</dd>
</dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="class_qwt_synthetic_point_data.html#a1a0b2548b496affcf65272acd86c6700">setInterval()</a>, <a class="el" href="class_qwt_synthetic_point_data.html#a321754c5acac77e0e5685968b1cdfdae">setSize()</a> </dd></dl>
</div>
</div>
<h2 class="groupheader">Member Function Documentation</h2>
<a class="anchor" id="a89296d373856825047f48e86d7731b0a"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
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<td class="mlabels-left">
<table class="memname">
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<td class="memname">QRectF QwtSyntheticPointData::boundingRect </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
</tr>
</table>
</div><div class="memdoc">
<p>Calculate the bounding rectangle. </p>
<p>This implementation iterates over all points, what could often be implemented much faster using the characteristics of the series. When there are many points it is recommended to overload and reimplement this method using the characteristics of the series ( if possible ).</p>
<dl class="section return"><dt>Returns</dt><dd>Bounding rectangle </dd></dl>
<p>Implements <a class="el" href="class_qwt_series_data.html#aedb969ba51a27d88d26ad7f7cb1c2c7f">QwtSeriesData< QPointF ></a>.</p>
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<td class="memname"><a class="el" href="class_qwt_interval.html">QwtInterval</a> QwtSyntheticPointData::interval </td>
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<td class="paramname"></td><td>)</td>
<td> const</td>
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<dl class="section return"><dt>Returns</dt><dd>Bounding interval </dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="class_qwt_synthetic_point_data.html#a1a0b2548b496affcf65272acd86c6700">setInterval()</a>, <a class="el" href="class_qwt_synthetic_point_data.html#a61b2cc26e1b5fa4a64e29273cf3e1599">size()</a> </dd></dl>
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<td class="memname">QRectF QwtSyntheticPointData::rectOfInterest </td>
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<td> const</td>
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<dl class="section return"><dt>Returns</dt><dd>"rectangle of interest" </dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="class_qwt_synthetic_point_data.html#a39cc8512e7d8beecde003f7781174b84">setRectOfInterest()</a> </dd></dl>
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<td class="memname">QPointF QwtSyntheticPointData::sample </td>
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<td class="paramtype">size_t </td>
<td class="paramname"><em>index</em></td><td>)</td>
<td> const</td>
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<p>Calculate the point from an index</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">index</td><td>Index </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>QPointF(x(index), y(x(index)));</dd></dl>
<dl class="section warning"><dt>Warning</dt><dd>For invalid indices ( index < 0 || index >= <a class="el" href="class_qwt_synthetic_point_data.html#a61b2cc26e1b5fa4a64e29273cf3e1599">size()</a> ) (0, 0) is returned. </dd></dl>
<p>Implements <a class="el" href="class_qwt_series_data.html#ae8650d16c07c58f01897ab48658a3266">QwtSeriesData< QPointF ></a>.</p>
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<td class="memname">void QwtSyntheticPointData::setInterval </td>
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<td class="paramtype">const <a class="el" href="class_qwt_interval.html">QwtInterval</a> & </td>
<td class="paramname"><em>interval</em></td><td>)</td>
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<p>Set the bounding interval</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">interval</td><td>Interval </td></tr>
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</dd>
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<dl class="section see"><dt>See Also</dt><dd><a class="el" href="class_qwt_synthetic_point_data.html#acd5ffffb670778cfd714bc915615851e">interval()</a>, <a class="el" href="class_qwt_synthetic_point_data.html#a321754c5acac77e0e5685968b1cdfdae">setSize()</a> </dd></dl>
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<td class="memname">void QwtSyntheticPointData::setRectOfInterest </td>
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<td class="paramtype">const QRectF & </td>
<td class="paramname"><em>rect</em></td><td>)</td>
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<p>Set a the "rectangle of interest"</p>
<p><a class="el" href="class_qwt_plot_series_item.html" title="Base class for plot items representing a series of samples.">QwtPlotSeriesItem</a> defines the current area of the plot canvas as "rect of interest" ( <a class="el" href="class_qwt_plot_series_item.html#a890792d0f44e341812b5283c249608b2" title="Update the item to changes of the axes scale division.">QwtPlotSeriesItem::updateScaleDiv()</a> ).</p>
<p>If <a class="el" href="class_qwt_synthetic_point_data.html#acd5ffffb670778cfd714bc915615851e">interval()</a>.isValid() == false the x values are calculated in the interval rect.left() -> rect.right().</p>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="class_qwt_synthetic_point_data.html#a00ead6b5e6cbc06d87af6edaa518d05f">rectOfInterest()</a> </dd></dl>
<p>Reimplemented from <a class="el" href="class_qwt_series_data.html#a391b4601a7454b2f9582fbc2662d108e">QwtSeriesData< QPointF ></a>.</p>
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<td class="memname">void QwtSyntheticPointData::setSize </td>
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<td class="paramtype">size_t </td>
<td class="paramname"><em>size</em></td><td>)</td>
<td></td>
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<p>Change the number of points</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">size</td><td>Number of points </td></tr>
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</dd>
</dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="class_qwt_synthetic_point_data.html#a61b2cc26e1b5fa4a64e29273cf3e1599">size()</a>, <a class="el" href="class_qwt_synthetic_point_data.html#a1a0b2548b496affcf65272acd86c6700">setInterval()</a> </dd></dl>
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<td class="memname">size_t QwtSyntheticPointData::size </td>
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<td> const</td>
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<dl class="section return"><dt>Returns</dt><dd>Number of points </dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="class_qwt_synthetic_point_data.html#a321754c5acac77e0e5685968b1cdfdae">setSize()</a>, <a class="el" href="class_qwt_synthetic_point_data.html#acd5ffffb670778cfd714bc915615851e">interval()</a> </dd></dl>
<p>Implements <a class="el" href="class_qwt_series_data.html#a3cfe5b26fc55a887ac85b0103ae80a3e">QwtSeriesData< QPointF ></a>.</p>
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<td class="memname">double QwtSyntheticPointData::x </td>
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<td class="paramtype">uint </td>
<td class="paramname"><em>index</em></td><td>)</td>
<td> const</td>
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<p>Calculate a x-value from an index</p>
<p>x values are calculated by dividing an interval into equidistant steps. If !interval().isValid() the interval is calculated from the "rectangle of interest".</p>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="class_qwt_synthetic_point_data.html#acd5ffffb670778cfd714bc915615851e">interval()</a>, <a class="el" href="class_qwt_synthetic_point_data.html#a00ead6b5e6cbc06d87af6edaa518d05f">rectOfInterest()</a>, <a class="el" href="class_qwt_synthetic_point_data.html#af65186bea0056b3f7f46814c61d68c99">y()</a> </dd></dl>
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<td class="memname">virtual double QwtSyntheticPointData::y </td>
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<td class="paramtype">double </td>
<td class="paramname"><em>x</em></td><td>)</td>
<td> const</td>
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<p>Calculate a y value for a x value</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">x</td><td>x value </td></tr>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>Corresponding y value </dd></dl>
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