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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Qwt User's Guide: QwtData Class Reference</title>
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<div id="projectname">Qwt User's Guide <span id="projectnumber">5.2.2</span></div>
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<a href="#pub-methods">Public Member Functions</a> |
<a href="#pro-methods">Protected Member Functions</a> </div>
<div class="headertitle">
<h1>QwtData Class Reference</h1> </div>
</div>
<div class="contents">
<!-- doxytag: class="QwtData" -->
<p><a class="el" href="class_qwt_data.html" title="QwtData defines an interface to any type of curve data.">QwtData</a> defines an interface to any type of curve data.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="qwt__data_8h_source.html">qwt_data.h</a>></code></p>
<div class="dynheader">
Inheritance diagram for QwtData:</div>
<div class="dyncontent">
<div class="center"><img src="class_qwt_data__inherit__graph.png" border="0" usemap="#_qwt_data_inherit__map" alt="Inheritance graph"/></div>
<map name="_qwt_data_inherit__map" id="_qwt_data_inherit__map">
<area shape="rect" id="node3" href="class_qwt_array_data.html" title="Data class containing two QwtArray<double> objects." alt="" coords="5,86,107,117"/><area shape="rect" id="node5" href="class_qwt_c_pointer_data.html" title="Data class containing two pointers to memory blocks of doubles." alt="" coords="131,86,251,117"/><area shape="rect" id="node7" href="class_qwt_polygon_f_data.html" title="Data class containing a single QwtArray<QwtDoublePoint> object." alt="" coords="275,86,400,117"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<p><a href="class_qwt_data-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual QwtDoubleRect </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#ad72b6842ce6af1f61f9643786d63a91f">boundingRect</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="class_qwt_data.html">QwtData</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#a8531a1add1f0b2d12809f90f97fd80c9">copy</a> () const =0</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#ade45c6c6d06b5fb4d1332b49168a008b">QwtData</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#a6028c06e7e72de98fb7a8a3ec6acdf47">size</a> () const =0</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#a922401ada56fc6dd3ccbeb1cfcdcfe28">x</a> (size_t i) const =0</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#a6a160842c98ddd98a65fd229776c324c">y</a> (size_t i) const =0</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#a6c813cff34e61a74f3a146177424f473">~QwtData</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"><a class="el" href="class_qwt_data.html">QwtData</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#a3615d59935a028b66202ab5fcde3ec31">operator=</a> (const <a class="el" href="class_qwt_data.html">QwtData</a> &)</td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p><a class="el" href="class_qwt_data.html" title="QwtData defines an interface to any type of curve data.">QwtData</a> defines an interface to any type of curve data. </p>
<p>Classes, derived from <a class="el" href="class_qwt_data.html" title="QwtData defines an interface to any type of curve data.">QwtData</a> may:</p>
<ul>
<li>store the data in almost any type of container</li>
<li>calculate the data on the fly instead of storing it </li>
</ul>
</div><hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="ade45c6c6d06b5fb4d1332b49168a008b"></a><!-- doxytag: member="QwtData::QwtData" ref="ade45c6c6d06b5fb4d1332b49168a008b" args="()" -->
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<td class="memname">QwtData::QwtData </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
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<p>Constructor. </p>
</div>
</div>
<a class="anchor" id="a6c813cff34e61a74f3a146177424f473"></a><!-- doxytag: member="QwtData::~QwtData" ref="a6c813cff34e61a74f3a146177424f473" args="()" -->
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<td class="memname">QwtData::~QwtData </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td><code> [virtual]</code></td>
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</div>
<div class="memdoc">
<p>Destructor. </p>
</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="ad72b6842ce6af1f61f9643786d63a91f"></a><!-- doxytag: member="QwtData::boundingRect" ref="ad72b6842ce6af1f61f9643786d63a91f" args="() const " -->
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<td class="memname">QwtDoubleRect QwtData::boundingRect </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const<code> [virtual]</code></td>
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<div class="memdoc">
<p>Returns the bounding rectangle of the data. If there is no bounding rect, like for empty data the rectangle is invalid: QwtDoubleRect::isValid() == false</p>
<dl class="warning"><dt><b>Warning:</b></dt><dd>This is an slow implementation iterating over all points. It is intended to be overloaded by derived classes. In case of auto scaling <a class="el" href="class_qwt_data.html#ad72b6842ce6af1f61f9643786d63a91f">boundingRect()</a> is called for every replot, so it might be worth to implement a cache, or use x(0), x(<a class="el" href="class_qwt_data.html#a6028c06e7e72de98fb7a8a3ec6acdf47">size()</a> - 1) for ordered data ... </dd></dl>
<p>Reimplemented in <a class="el" href="class_qwt_array_data.html#a0cb028fcbd48980839eab90c3fdac2d5">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#afa08cb9715db81f68bcf87f8a37a71ea">QwtCPointerData</a>.</p>
</div>
</div>
<a class="anchor" id="a8531a1add1f0b2d12809f90f97fd80c9"></a><!-- doxytag: member="QwtData::copy" ref="a8531a1add1f0b2d12809f90f97fd80c9" args="() const =0" -->
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<td class="memname">virtual <a class="el" href="class_qwt_data.html">QwtData</a>* QwtData::copy </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const<code> [pure virtual]</code></td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Pointer to a copy (virtual copy constructor) </dd></dl>
<p>Implemented in <a class="el" href="class_qwt_polygon_f_data.html#a3e8e8809e6bbb8efb8bbed5b8044644f">QwtPolygonFData</a>, <a class="el" href="class_qwt_array_data.html#a9afcbf6cbd1f080b97c74ce1607d8456">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#a02a09662881df362369bf078842d1380">QwtCPointerData</a>.</p>
</div>
</div>
<a class="anchor" id="a3615d59935a028b66202ab5fcde3ec31"></a><!-- doxytag: member="QwtData::operator=" ref="a3615d59935a028b66202ab5fcde3ec31" args="(const QwtData &)" -->
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<td class="memname"><a class="el" href="class_qwt_data.html">QwtData</a>& QwtData::operator= </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="class_qwt_data.html">QwtData</a> & </td>
<td class="paramname"></td><td>)</td>
<td><code> [protected]</code></td>
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<div class="memdoc">
<p>Assignment operator (virtualized) </p>
</div>
</div>
<a class="anchor" id="a6028c06e7e72de98fb7a8a3ec6acdf47"></a><!-- doxytag: member="QwtData::size" ref="a6028c06e7e72de98fb7a8a3ec6acdf47" args="() const =0" -->
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<td class="memname">virtual size_t QwtData::size </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const<code> [pure virtual]</code></td>
</tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Size of the data set </dd></dl>
<p>Implemented in <a class="el" href="class_qwt_polygon_f_data.html#a3a002042c6c0b0bf35e7172c37a6c1b2">QwtPolygonFData</a>, <a class="el" href="class_qwt_array_data.html#ae7d5991e85c8d32c8945e67dc3bd88db">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#a780b9ae434856509cef9bbe954f03a3e">QwtCPointerData</a>.</p>
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</div>
<a class="anchor" id="a922401ada56fc6dd3ccbeb1cfcdcfe28"></a><!-- doxytag: member="QwtData::x" ref="a922401ada56fc6dd3ccbeb1cfcdcfe28" args="(size_t i) const =0" -->
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<td class="memname">virtual double QwtData::x </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>i</em></td><td>)</td>
<td> const<code> [pure virtual]</code></td>
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<p>Return the x value of data point i </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">i</td><td>Index </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>x X value of data point i </dd></dl>
<p>Implemented in <a class="el" href="class_qwt_polygon_f_data.html#aca74b3b767c5fd2567215583d3712425">QwtPolygonFData</a>, <a class="el" href="class_qwt_array_data.html#a12d08694fd95fd5ad568ffc07d6f1103">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#a178b1e84039edee9eadd5a849559c882">QwtCPointerData</a>.</p>
</div>
</div>
<a class="anchor" id="a6a160842c98ddd98a65fd229776c324c"></a><!-- doxytag: member="QwtData::y" ref="a6a160842c98ddd98a65fd229776c324c" args="(size_t i) const =0" -->
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<td class="memname">virtual double QwtData::y </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>i</em></td><td>)</td>
<td> const<code> [pure virtual]</code></td>
</tr>
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<div class="memdoc">
<p>Return the y value of data point i </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">i</td><td>Index </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>y Y value of data point i </dd></dl>
<p>Implemented in <a class="el" href="class_qwt_polygon_f_data.html#a3b762f31fd970ec7ce9706930f33c1aa">QwtPolygonFData</a>, <a class="el" href="class_qwt_array_data.html#a4ff85108ee8735fb1be9905dc6af22a6">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#a792eaf93b84f8ec97c4e742ec6ff08de">QwtCPointerData</a>.</p>
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