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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Qwt User's Guide: QwtData Class Reference</title>
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<div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical List</a> | <a class="qindex" href="annotated.html">Class List</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Class Members</a> | <a class="qindex" href="globals.html">File Members</a> | <a class="qindex" href="pages.html">Related Pages</a></div>
<h1>QwtData Class Reference</h1>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>
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<area href="class_qwt_c_pointer_data.html" shape="rect" coords="129,93,246,117" alt="">
<area href="class_qwt_double_point_data.html" shape="rect" coords="270,93,409,117" alt="">
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<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>
QwtData defines an interface to any type of data.
<p>
Classes, derived from QwtData 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><li>implement data with error bars (this implies subclassing <a class="el" href="class_qwt_plot.html">QwtPlot</a>, <a class="el" href="class_qwt_curve.html">QwtCurve</a> and <a class="el" href="class_qwt_plot_curve.html">QwtPlotCurve</a>)</li></ul>
<p>
<dl compact><dt><b>Warning:</b></dt><dd>In the future, "almost any type of container" may be limited to containers supporting bi-directional iterators like the vector, array and list classes in Qt or in the standard template library. </dd></dl>
<p>
Definition at line <a class="el" href="qwt__data_8h-source.html#l00040">40</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>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#a2">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#a3">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#a4">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#a5">y</a> (size_t i) const =0</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>virtual <a class="el" href="class_qwt_double_rect.html">QwtDoubleRect</a> </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_data.html#a6">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#b0">operator=</a> (const <a class="el" href="class_qwt_data.html">QwtData</a> &)</td></tr>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="a6" doxytag="QwtData::boundingRect" ></a><p>
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<td class="md" nowrap valign="top"> <a class="el" href="class_qwt_double_rect.html">QwtDoubleRect</a> 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>
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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: <a class="el" href="class_qwt_double_rect.html#a5">QwtDoubleRect::isValid()</a> == 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#a6">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#a3">size()</a> - 1) for ordered data ... </dd></dl>
<p>
Reimplemented in <a class="el" href="class_qwt_array_data.html#a7">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#a6">QwtCPointerData</a>.
<p>
Definition at line <a class="el" href="qwt__data_8cpp-source.html#l00033">33</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#a3">size()</a>, <a class="el" href="class_qwt_data.html#a4">x()</a>, and <a class="el" href="class_qwt_data.html#a5">y()</a>.
<p>
Referenced by <a class="el" href="qwt__curve_8cpp-source.html#l00309">QwtCurve::boundingRect()</a>. </td>
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<a class="anchor" name="a2" doxytag="QwtData::copy" ></a><p>
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<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>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [pure virtual]</code></td>
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<p>
Return a pointer to a copy (virtual copy constructor)
<p>
Implemented in <a class="el" href="class_qwt_double_point_data.html#a2">QwtDoublePointData</a>, <a class="el" href="class_qwt_array_data.html#a3">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#a2">QwtCPointerData</a>.
<p>
<p>
Referenced by <a class="el" href="qwt__curve_8cpp-source.html#l00036">QwtCurve::copy()</a>, and <a class="el" href="qwt__curve_8cpp-source.html#l00257">QwtCurve::setData()</a>. </td>
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<a class="anchor" name="b0" doxytag="QwtData::operator=" ></a><p>
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<td class="md" nowrap valign="top"> <a class="el" href="class_qwt_data.html">QwtData</a>& QwtData::operator= </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="class_qwt_data.html">QwtData</a> & </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [protected]</code></td>
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<p>
Assignment operator (virtualized) </td>
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<a class="anchor" name="a3" doxytag="QwtData::size" ></a><p>
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<td class="md" nowrap valign="top"> virtual size_t QwtData::size </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> [pure virtual]</code></td>
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<p>
Return the size of the data set
<p>
Implemented in <a class="el" href="class_qwt_double_point_data.html#a3">QwtDoublePointData</a>, <a class="el" href="class_qwt_array_data.html#a4">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#a3">QwtCPointerData</a>.
<p>
<p>
Referenced by <a class="el" href="qwt__data_8cpp-source.html#l00033">boundingRect()</a>, and <a class="el" href="qwt__curve_8cpp-source.html#l00915">QwtCurve::dataSize()</a>. </td>
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<a class="anchor" name="a4" doxytag="QwtData::x" ></a><p>
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<td class="md" nowrap valign="top"> virtual double QwtData::x </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">size_t </td>
<td class="mdname1" valign="top" nowrap> <em>i</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [pure virtual]</code></td>
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<p>
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></td><td valign=top><em>i</em> </td><td>Index </td></tr>
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</dl>
<dl 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_double_point_data.html#a4">QwtDoublePointData</a>, <a class="el" href="class_qwt_array_data.html#a5">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#a4">QwtCPointerData</a>.
<p>
<p>
Referenced by <a class="el" href="qwt__data_8cpp-source.html#l00033">boundingRect()</a>. </td>
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<a class="anchor" name="a5" doxytag="QwtData::y" ></a><p>
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<td class="md" nowrap valign="top"> virtual double QwtData::y </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">size_t </td>
<td class="mdname1" valign="top" nowrap> <em>i</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> 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></td><td valign=top><em>i</em> </td><td>Index </td></tr>
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<dl 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_double_point_data.html#a5">QwtDoublePointData</a>, <a class="el" href="class_qwt_array_data.html#a6">QwtArrayData</a>, and <a class="el" href="class_qwt_c_pointer_data.html#a5">QwtCPointerData</a>.
<p>
<p>
Referenced by <a class="el" href="qwt__data_8cpp-source.html#l00033">boundingRect()</a>, and <a class="el" href="qwt__curve_8h-source.html#l00214">QwtCurve::y()</a>. </td>
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