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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Qwt User's Guide: QwtData Class Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.6 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li id="current"><a href="classes.html"><span>Classes</span></a></li> <li><a href="files.html"><span>Files</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="classes.html"><span>Alphabetical List</span></a></li> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="hierarchy.html"><span>Class Hierarchy</span></a></li> <li><a href="functions.html"><span>Class Members</span></a></li> </ul></div><h1>QwtData Class Reference</h1><!-- doxytag: class="QwtData" -->Inheritance diagram for QwtData:<p><center><img src="class_qwt_data__inherit__graph.png" border="0" usemap="#_qwt_data__inherit__map" alt="Inheritance graph"></center><map name="_qwt_data__inherit__map"><area href="class_qwt_array_data.html" shape="rect" coords="7,83,111,107" alt=""><area href="class_qwt_c_pointer_data.html" shape="rect" coords="135,83,260,107" alt=""><area href="class_qwt_polygon_f_data.html" shape="rect" coords="284,83,412,107" alt=""></map><center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="class_qwt_data-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2><a class="el" href="class_qwt_data.html">QwtData</a> defines an interface to any type of curve data. <p>Classes, derived from <a class="el" href="class_qwt_data.html">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><p><p>Definition at line <a class="el" href="qwt__data_8h-source.html#l00047">47</a> of file <a class="el" href="qwt__data_8h-source.html">qwt_data.h</a>.<table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><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></table><hr><h2>Constructor & Destructor Documentation</h2><a class="anchor" name="de45c6c6d06b5fb4d1332b49168a008b"></a><!-- doxytag: member="QwtData::QwtData" ref="de45c6c6d06b5fb4d1332b49168a008b" args="()" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">QwtData::QwtData </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Constructor. <p><p>Definition at line <a class="el" href="qwt__data_8cpp-source.html#l00014">14</a> of file <a class="el" href="qwt__data_8cpp-source.html">qwt_data.cpp</a>. </td> </tr></table><a class="anchor" name="6c813cff34e61a74f3a146177424f473"></a><!-- doxytag: member="QwtData::~QwtData" ref="6c813cff34e61a74f3a146177424f473" args="()" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">QwtData::~QwtData </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap><code> [virtual]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Destructor. <p><p>Definition at line <a class="el" href="qwt__data_8cpp-source.html#l00019">19</a> of file <a class="el" href="qwt__data_8cpp-source.html">qwt_data.cpp</a>. </td> </tr></table><hr><h2>Member Function Documentation</h2><a class="anchor" name="d72b6842ce6af1f61f9643786d63a91f"></a><!-- doxytag: member="QwtData::boundingRect" ref="d72b6842ce6af1f61f9643786d63a91f" args="() const " --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">QwtDoubleRect QwtData::boundingRect </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> const<code> [virtual]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><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 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>Definition at line <a class="el" href="qwt__data_8cpp-source.html#l00034">34</a> of file <a class="el" href="qwt__data_8cpp-source.html">qwt_data.cpp</a>.<p>References <a class="el" href="class_qwt_data.html#6028c06e7e72de98fb7a8a3ec6acdf47">size()</a>, <a class="el" href="class_qwt_data.html#922401ada56fc6dd3ccbeb1cfcdcfe28">x()</a>, and <a class="el" href="class_qwt_data.html#6a160842c98ddd98a65fd229776c324c">y()</a>.<p>Referenced by <a class="el" href="qwt__plot__curve_8cpp-source.html#l00437">QwtPlotCurve::boundingRect()</a>. </td> </tr></table><a class="anchor" name="8531a1add1f0b2d12809f90f97fd80c9"></a><!-- doxytag: member="QwtData::copy" ref="8531a1add1f0b2d12809f90f97fd80c9" args="() const =0" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">virtual <a class="el" href="class_qwt_data.html">QwtData</a>* QwtData::copy </td> <td class="md" valign="top">( </td>⌨️ 快捷键说明
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