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<h1>QwtData Class Reference</h1><!-- doxytag: class="QwtData" --><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>
<code>#include <<a class="el" href="qwt__data_8h-source.html">qwt_data.h</a>></code>
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Inheritance diagram for QwtData:</div>
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<p><center><img src="class_qwt_data__inherit__graph.png" border="0" usemap="#_qwt_data__inherit__map" alt="Inheritance graph"></center>
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<area shape="rect" href="class_qwt_array_data.html" title="Data class containing two QwtArray<double> objects." alt="" coords="7,83,113,107"><area shape="rect" href="class_qwt_c_pointer_data.html" title="Data class containing two pointers to memory blocks of doubles." alt="" coords="137,83,263,107"><area shape="rect" href="class_qwt_polygon_f_data.html" title="Data class containing a single QwtArray<QwtDoublePoint> object." alt="" coords="287,83,417,107"></map>
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<a href="class_qwt_data-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
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<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#de45c6c6d06b5fb4d1332b49168a008b">QwtData</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#6c813cff34e61a74f3a146177424f473">~QwtData</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap 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#8531a1add1f0b2d12809f90f97fd80c9">copy</a> () const =0</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#6028c06e7e72de98fb7a8a3ec6acdf47">size</a> () const =0</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#922401ada56fc6dd3ccbeb1cfcdcfe28">x</a> (size_t i) const =0</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#6a160842c98ddd98a65fd229776c324c">y</a> (size_t i) const =0</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual QwtDoubleRect </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_data.html#d72b6842ce6af1f61f9643786d63a91f">boundingRect</a> () const </td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap 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#3615d59935a028b66202ab5fcde3ec31">operator=</a> (const <a class="el" href="class_qwt_data.html">QwtData</a> &)</td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
<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>
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:<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>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="de45c6c6d06b5fb4d1332b49168a008b"></a><!-- doxytag: member="QwtData::QwtData" ref="de45c6c6d06b5fb4d1332b49168a008b" args="()" -->
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<td class="memname">QwtData::QwtData </td>
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Constructor.
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<a class="anchor" name="6c813cff34e61a74f3a146177424f473"></a><!-- doxytag: member="QwtData::~QwtData" ref="6c813cff34e61a74f3a146177424f473" args="()" -->
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<td class="memname">QwtData::~QwtData </td>
<td>(</td>
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<td><code> [virtual]</code></td>
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Destructor.
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="d72b6842ce6af1f61f9643786d63a91f"></a><!-- doxytag: member="QwtData::boundingRect" ref="d72b6842ce6af1f61f9643786d63a91f" args="() const " -->
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<td class="memname">QwtDoubleRect QwtData::boundingRect </td>
<td>(</td>
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<td> ) </td>
<td> const<code> [virtual]</code></td>
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<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" compact><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#d72b6842ce6af1f61f9643786d63a91f">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#6028c06e7e72de98fb7a8a3ec6acdf47">size()</a> - 1) for ordered data ... </dd></dl>
<p>Reimplemented in <a class="el" href="class_qwt_array_data.html#0cb028fcbd48980839eab90c3fdac2d5">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#fa08cb9715db81f68bcf87f8a37a71ea">QwtCPointerData</a>.</p>
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<a class="anchor" name="8531a1add1f0b2d12809f90f97fd80c9"></a><!-- doxytag: member="QwtData::copy" ref="8531a1add1f0b2d12809f90f97fd80c9" 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" compact><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#3e8e8809e6bbb8efb8bbed5b8044644f">QwtPolygonFData</a>, <a class="el" href="class_qwt_array_data.html#9afcbf6cbd1f080b97c74ce1607d8456">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#02a09662881df362369bf078842d1380">QwtCPointerData</a>.</p>
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<a class="anchor" name="3615d59935a028b66202ab5fcde3ec31"></a><!-- doxytag: member="QwtData::operator=" ref="3615d59935a028b66202ab5fcde3ec31" 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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<p>
Assignment operator (virtualized)
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<a class="anchor" name="6028c06e7e72de98fb7a8a3ec6acdf47"></a><!-- doxytag: member="QwtData::size" ref="6028c06e7e72de98fb7a8a3ec6acdf47" 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>
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<dl class="return" compact><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#3a002042c6c0b0bf35e7172c37a6c1b2">QwtPolygonFData</a>, <a class="el" href="class_qwt_array_data.html#e7d5991e85c8d32c8945e67dc3bd88db">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#780b9ae434856509cef9bbe954f03a3e">QwtCPointerData</a>.</p>
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<a class="anchor" name="922401ada56fc6dd3ccbeb1cfcdcfe28"></a><!-- doxytag: member="QwtData::x" ref="922401ada56fc6dd3ccbeb1cfcdcfe28" 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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Return the x value of data point i <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>i</em> </td><td>Index </td></tr>
</table>
</dl>
<dl class="return" compact><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#ca74b3b767c5fd2567215583d3712425">QwtPolygonFData</a>, <a class="el" href="class_qwt_array_data.html#12d08694fd95fd5ad568ffc07d6f1103">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#178b1e84039edee9eadd5a849559c882">QwtCPointerData</a>.</p>
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<a class="anchor" name="6a160842c98ddd98a65fd229776c324c"></a><!-- doxytag: member="QwtData::y" ref="6a160842c98ddd98a65fd229776c324c" 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>
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Return the y value of data point i <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>i</em> </td><td>Index </td></tr>
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<dl class="return" compact><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#3b762f31fd970ec7ce9706930f33c1aa">QwtPolygonFData</a>, <a class="el" href="class_qwt_array_data.html#4ff85108ee8735fb1be9905dc6af22a6">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#792eaf93b84f8ec97c4e742ec6ff08de">QwtCPointerData</a>.</p>
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