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<div class="title">QwtSpline Class Reference</div> </div>
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<p>A class for spline interpolation.
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<a href="class_qwt_spline.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="qwt__spline_8h_source.html">qwt_spline.h</a>></code></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
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Public Types</h2></td></tr>
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<tr class="memitem:a2bd2bda128f82acd596348eb8d64231c"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a2bd2bda128f82acd596348eb8d64231c">SplineType</a> { <a class="el" href="class_qwt_spline.html#a2bd2bda128f82acd596348eb8d64231ca506b78ec81ab6d56a4bbce891490c857">Natural</a>,
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<a class="el" href="class_qwt_spline.html#a2bd2bda128f82acd596348eb8d64231ca500c12cdbdef35c62e9fab86c5727acb">Periodic</a>
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}<tr class="memdesc:a2bd2bda128f82acd596348eb8d64231c"><td class="mdescLeft"> </td><td class="mdescRight">Spline type. <a href="class_qwt_spline.html#a2bd2bda128f82acd596348eb8d64231c">More...</a><br /></td></tr>
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</td></tr>
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<tr class="separator:a2bd2bda128f82acd596348eb8d64231c"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a5d1e0ba35c637a88c66d9e4cbaf36e93"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5d1e0ba35c637a88c66d9e4cbaf36e93"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a5d1e0ba35c637a88c66d9e4cbaf36e93">QwtSpline</a> ()</td></tr>
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<tr class="memdesc:a5d1e0ba35c637a88c66d9e4cbaf36e93"><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <br /></td></tr>
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<tr class="separator:a5d1e0ba35c637a88c66d9e4cbaf36e93"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a2e42391f76d0b3091bf7754239f3ff0d"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a2e42391f76d0b3091bf7754239f3ff0d">QwtSpline</a> (const <a class="el" href="class_qwt_spline.html">QwtSpline</a> &)</td></tr>
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<tr class="separator:a2e42391f76d0b3091bf7754239f3ff0d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a90805882826469c94fdc871f18261bb6"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a90805882826469c94fdc871f18261bb6"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a90805882826469c94fdc871f18261bb6">~QwtSpline</a> ()</td></tr>
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<tr class="memdesc:a90805882826469c94fdc871f18261bb6"><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br /></td></tr>
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<tr class="separator:a90805882826469c94fdc871f18261bb6"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a8a597c34477dd4b5298db2d445b4e596"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_spline.html">QwtSpline</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a8a597c34477dd4b5298db2d445b4e596">operator=</a> (const <a class="el" href="class_qwt_spline.html">QwtSpline</a> &)</td></tr>
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<tr class="separator:a8a597c34477dd4b5298db2d445b4e596"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a222953661f01658a16042d587196aff8"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a222953661f01658a16042d587196aff8">setSplineType</a> (<a class="el" href="class_qwt_spline.html#a2bd2bda128f82acd596348eb8d64231c">SplineType</a>)</td></tr>
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<tr class="separator:a222953661f01658a16042d587196aff8"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a36442cbb781422e5b97ae242265dd4b4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_spline.html#a2bd2bda128f82acd596348eb8d64231c">SplineType</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a36442cbb781422e5b97ae242265dd4b4">splineType</a> () const </td></tr>
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<tr class="separator:a36442cbb781422e5b97ae242265dd4b4"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6ed13410b1d5f6b33ba0e3c2b07932cf"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a6ed13410b1d5f6b33ba0e3c2b07932cf">setPoints</a> (const QPolygonF &<a class="el" href="class_qwt_spline.html#a14694e61052933921eda629062554d22">points</a>)</td></tr>
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<tr class="memdesc:a6ed13410b1d5f6b33ba0e3c2b07932cf"><td class="mdescLeft"> </td><td class="mdescRight">Calculate the spline coefficients. <a href="#a6ed13410b1d5f6b33ba0e3c2b07932cf">More...</a><br /></td></tr>
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<tr class="separator:a6ed13410b1d5f6b33ba0e3c2b07932cf"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a14694e61052933921eda629062554d22"><td class="memItemLeft" align="right" valign="top">QPolygonF </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a14694e61052933921eda629062554d22">points</a> () const </td></tr>
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<tr class="separator:a14694e61052933921eda629062554d22"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:afc52fd49e7f00d57a0336059fae299c0"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="afc52fd49e7f00d57a0336059fae299c0"></a>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#afc52fd49e7f00d57a0336059fae299c0">reset</a> ()</td></tr>
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<tr class="memdesc:afc52fd49e7f00d57a0336059fae299c0"><td class="mdescLeft"> </td><td class="mdescRight">Free allocated memory and set size to 0. <br /></td></tr>
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<tr class="separator:afc52fd49e7f00d57a0336059fae299c0"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a8eb42cf7f0f81bb7b7b885466f8ebbbf"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8eb42cf7f0f81bb7b7b885466f8ebbbf"></a>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a8eb42cf7f0f81bb7b7b885466f8ebbbf">isValid</a> () const </td></tr>
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<tr class="memdesc:a8eb42cf7f0f81bb7b7b885466f8ebbbf"><td class="mdescLeft"> </td><td class="mdescRight">True if valid. <br /></td></tr>
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<tr class="separator:a8eb42cf7f0f81bb7b7b885466f8ebbbf"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1f67187eefe2959f0c902532edf64d41"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a1f67187eefe2959f0c902532edf64d41">value</a> (double x) const </td></tr>
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<tr class="separator:a1f67187eefe2959f0c902532edf64d41"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:abbc5c1cf6016fc57050f379250da031e"><td class="memItemLeft" align="right" valign="top">const QVector< double > & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#abbc5c1cf6016fc57050f379250da031e">coefficientsA</a> () const </td></tr>
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<tr class="separator:abbc5c1cf6016fc57050f379250da031e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1de897d6cc2d0d8dac840d15d0bb603e"><td class="memItemLeft" align="right" valign="top">const QVector< double > & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a1de897d6cc2d0d8dac840d15d0bb603e">coefficientsB</a> () const </td></tr>
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<tr class="separator:a1de897d6cc2d0d8dac840d15d0bb603e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a27d51429a7447b18a8f05a44b3418f89"><td class="memItemLeft" align="right" valign="top">const QVector< double > & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a27d51429a7447b18a8f05a44b3418f89">coefficientsC</a> () const </td></tr>
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<tr class="separator:a27d51429a7447b18a8f05a44b3418f89"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
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Protected Member Functions</h2></td></tr>
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<tr class="memitem:a1cdf09e841dd6a721eb788914273c484"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a1cdf09e841dd6a721eb788914273c484">buildNaturalSpline</a> (const QPolygonF &)</td></tr>
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<tr class="memdesc:a1cdf09e841dd6a721eb788914273c484"><td class="mdescLeft"> </td><td class="mdescRight">Determines the coefficients for a natural spline. <a href="#a1cdf09e841dd6a721eb788914273c484">More...</a><br /></td></tr>
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<tr class="separator:a1cdf09e841dd6a721eb788914273c484"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a8184717f8c018e69fabd1e33ac68ef19"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_spline.html#a8184717f8c018e69fabd1e33ac68ef19">buildPeriodicSpline</a> (const QPolygonF &)</td></tr>
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<tr class="memdesc:a8184717f8c018e69fabd1e33ac68ef19"><td class="mdescLeft"> </td><td class="mdescRight">Determines the coefficients for a periodic spline. <a href="#a8184717f8c018e69fabd1e33ac68ef19">More...</a><br /></td></tr>
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<tr class="separator:a8184717f8c018e69fabd1e33ac68ef19"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>A class for spline interpolation. </p>
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<p>The <a class="el" href="class_qwt_spline.html" title="A class for spline interpolation. ">QwtSpline</a> class is used for cubical spline interpolation. Two types of splines, natural and periodic, are supported.</p>
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<dl class="section user"><dt>Usage:</dt><dd><ol>
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<li>
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First call <a class="el" href="class_qwt_spline.html#a6ed13410b1d5f6b33ba0e3c2b07932cf" title="Calculate the spline coefficients. ">setPoints()</a> to determine the spline coefficients for a tabulated function y(x). </li>
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<li>
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After the coefficients have been set up, the interpolated function value for an argument x can be determined by calling <a class="el" href="class_qwt_spline.html#a1f67187eefe2959f0c902532edf64d41">QwtSpline::value()</a>. </li>
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</ol>
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</dd></dl>
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<dl class="section user"><dt>Example:</dt><dd><div class="fragment"><div class="line"><span class="preprocessor">#include <qwt_spline.h></span></div><div class="line"></div><div class="line">QPolygonF interpolate(<span class="keyword">const</span> QPolygonF& <a class="code" href="class_qwt_spline.html#a14694e61052933921eda629062554d22">points</a>, <span class="keywordtype">int</span> numValues)</div><div class="line">{</div><div class="line"> <a class="code" href="class_qwt_spline.html">QwtSpline</a> spline;</div><div class="line"> <span class="keywordflow">if</span> ( !spline.<a class="code" href="class_qwt_spline.html#a6ed13410b1d5f6b33ba0e3c2b07932cf">setPoints</a>(points) )</div><div class="line"> <span class="keywordflow">return</span> points;</div><div class="line"></div><div class="line"> QPolygonF interpolatedPoints(numValues);</div><div class="line"></div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">double</span> delta =</div><div class="line"> (points[numPoints - 1].x() - points[0].x()) / (points.size() - 1);</div><div class="line"> <span class="keywordflow">for</span>(i = 0; i < points.size(); i++) / interpolate</div><div class="line"> {</div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">double</span> x = points[0].x() + i * delta;</div><div class="line"> interpolatedPoints[i].setX(x);</div><div class="line"> interpolatedPoints[i].setY(spline.<a class="code" href="class_qwt_spline.html#a1f67187eefe2959f0c902532edf64d41">value</a>(x));</div><div class="line"> }</div><div class="line"> <span class="keywordflow">return</span> interpolatedPoints;</div><div class="line">}</div></div><!-- fragment --> </dd></dl>
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</div><h2 class="groupheader">Member Enumeration Documentation</h2>
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<a class="anchor" id="a2bd2bda128f82acd596348eb8d64231c"></a>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">enum <a class="el" href="class_qwt_spline.html#a2bd2bda128f82acd596348eb8d64231c">QwtSpline::SplineType</a></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Spline type. </p>
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<table class="fieldtable">
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a class="anchor" id="a2bd2bda128f82acd596348eb8d64231ca506b78ec81ab6d56a4bbce891490c857"></a>Natural </td><td class="fielddoc">
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<p>A natural spline. </p>
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</td></tr>
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<tr><td class="fieldname"><a class="anchor" id="a2bd2bda128f82acd596348eb8d64231ca500c12cdbdef35c62e9fab86c5727acb"></a>Periodic </td><td class="fielddoc">
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<p>A periodic spline. </p>
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</td></tr>
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</table>
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</div>
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</div>
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<h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">QwtSpline::QwtSpline </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="class_qwt_spline.html">QwtSpline</a> & </td>
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<td class="paramname"><em>other</em></td><td>)</td>
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<p>Copy constructor </p><dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">other</td><td>Spline used for initialization </td></tr>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">bool QwtSpline::buildNaturalSpline </td>
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<td class="paramtype">const QPolygonF & </td>
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<p>Determines the coefficients for a natural spline. </p>
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<dl class="section return"><dt>Returns</dt><dd>true if successful </dd></dl>
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<td class="memname">bool QwtSpline::buildPeriodicSpline </td>
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<td class="paramtype">const QPolygonF & </td>
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<span class="mlabels"><span class="mlabel">protected</span></span> </td>
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<p>Determines the coefficients for a periodic spline. </p>
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<dl class="section return"><dt>Returns</dt><dd>true if successful </dd></dl>
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<td class="memname">const QVector< double > & QwtSpline::coefficientsA </td>
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<dl class="section return"><dt>Returns</dt><dd>A coefficients </dd></dl>
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<td class="memname">const QVector< double > & QwtSpline::coefficientsB </td>
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<dl class="section return"><dt>Returns</dt><dd>B coefficients </dd></dl>
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<td class="memname">const QVector< double > & QwtSpline::coefficientsC </td>
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<dl class="section return"><dt>Returns</dt><dd>C coefficients </dd></dl>
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<td class="memname"><a class="el" href="class_qwt_spline.html">QwtSpline</a> & QwtSpline::operator= </td>
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<p>Assignment operator </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">other</td><td>Spline used for initialization </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>*this </dd></dl>
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<td class="memname">QPolygonF QwtSpline::points </td>
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<dl class="section return"><dt>Returns</dt><dd>Points, that have been by <a class="el" href="class_qwt_spline.html#a6ed13410b1d5f6b33ba0e3c2b07932cf" title="Calculate the spline coefficients. ">setPoints()</a> </dd></dl>
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<td class="memname">bool QwtSpline::setPoints </td>
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<p>Calculate the spline coefficients. </p>
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<p>Depending on the value of <em>periodic</em>, this function will determine the coefficients for a natural or a periodic spline and store them internally.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">points</td><td>Points </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>true if successful </dd></dl>
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<dl class="section warning"><dt>Warning</dt><dd>The sequence of x (but not y) values has to be strictly monotone increasing, which means <code>points[i].x() < points[i+1].x()</code>. If this is not the case, the function will return false </dd></dl>
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<td class="memname">void QwtSpline::setSplineType </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="class_qwt_spline.html#a2bd2bda128f82acd596348eb8d64231c">SplineType</a> </td>
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<td class="paramname"><em>splineType</em></td><td>)</td>
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<p>Select the algorithm used for calculating the spline</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">splineType</td><td>Spline type </td></tr>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_spline.html#a36442cbb781422e5b97ae242265dd4b4">splineType()</a> </dd></dl>
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<td class="memname"><a class="el" href="class_qwt_spline.html#a2bd2bda128f82acd596348eb8d64231c">QwtSpline::SplineType</a> QwtSpline::splineType </td>
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<dl class="section return"><dt>Returns</dt><dd>the spline type </dd></dl>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_spline.html#a222953661f01658a16042d587196aff8">setSplineType()</a> </dd></dl>
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<td class="memname">double QwtSpline::value </td>
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<p>Calculate the interpolated function value corresponding to a given argument x.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">x</td><td>Coordinate </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Interpolated coordinate </dd></dl>
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