class_qwt_spline.html

QWT5.01用于Qt开发的二维图形库程序

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          <td class="md" nowrap valign="top">bool QwtSpline::buildPeriodicSpline           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const QPolygonF &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>points</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [protected]</code></td>
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<p>
Determines the coefficients for a periodic spline. 
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<dl compact><dt><b>Returns:</b></dt><dd>true if successful </dd></dl>

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Definition at line <a class="el" href="qwt__spline_8cpp-source.html#l00292">292</a> of file <a class="el" href="qwt__spline_8cpp-source.html">qwt_spline.cpp</a>.    </td>
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<a class="anchor" name="8eb42cf7f0f81bb7b7b885466f8ebbbf"></a><!-- doxytag: member="QwtSpline::isValid" ref="8eb42cf7f0f81bb7b7b885466f8ebbbf" args="() const " --><p>
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          <td class="md" nowrap valign="top">bool QwtSpline::isValid           </td>
          <td class="md" valign="top">(&nbsp;</td>
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<p>
True if valid. 
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Definition at line <a class="el" href="qwt__spline_8cpp-source.html#l00181">181</a> of file <a class="el" href="qwt__spline_8cpp-source.html">qwt_spline.cpp</a>.
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References <a class="el" href="qwt__spline_8h-source.html#l00121">d_data</a>.    </td>
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<a class="anchor" name="14694e61052933921eda629062554d22"></a><!-- doxytag: member="QwtSpline::points" ref="14694e61052933921eda629062554d22" args="() const " --><p>
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          <td class="md" nowrap valign="top">QPolygonF QwtSpline::points           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
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<p>
Return points passed by setPoints 
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Definition at line <a class="el" href="qwt__spline_8cpp-source.html#l00164">164</a> of file <a class="el" href="qwt__spline_8cpp-source.html">qwt_spline.cpp</a>.    </td>
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<a class="anchor" name="fc52fd49e7f00d57a0336059fae299c0"></a><!-- doxytag: member="QwtSpline::reset" ref="fc52fd49e7f00d57a0336059fae299c0" args="()" --><p>
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          <td class="md" nowrap valign="top">void QwtSpline::reset           </td>
          <td class="md" valign="top">(&nbsp;</td>
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<p>
Free allocated memory and set size to 0. 
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Definition at line <a class="el" href="qwt__spline_8cpp-source.html#l00172">172</a> of file <a class="el" href="qwt__spline_8cpp-source.html">qwt_spline.cpp</a>.
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References <a class="el" href="qwt__spline_8h-source.html#l00121">d_data</a>.    </td>
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<a class="anchor" name="6ed13410b1d5f6b33ba0e3c2b07932cf"></a><!-- doxytag: member="QwtSpline::setPoints" ref="6ed13410b1d5f6b33ba0e3c2b07932cf" args="(const QPolygonF &amp;points)" --><p>
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          <td class="md" nowrap valign="top">bool QwtSpline::setPoints           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const QPolygonF &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>points</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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<p>
Determine the function table index corresponding to a value x Calculate the spline coefficients. 
<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>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>x</em>&nbsp;</td><td></td></tr>
    <tr><td valign="top"></td><td valign="top"><em>y</em>&nbsp;</td><td>points </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>size</em>&nbsp;</td><td>number of points </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>periodic</em>&nbsp;</td><td>if true, calculate periodic spline </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>true if successful </dd></dl>
<dl compact><dt><b>Warning:</b></dt><dd>The sequence of x (but not y) values has to be strictly monotone increasing, which means <code>x[0] &lt; x[1] &lt; .... &lt; x[n-1]</code>. If this is not the case, the function will return false </dd></dl>

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Definition at line <a class="el" href="qwt__spline_8cpp-source.html#l00126">126</a> of file <a class="el" href="qwt__spline_8cpp-source.html">qwt_spline.cpp</a>.    </td>
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<a class="anchor" name="1f67187eefe2959f0c902532edf64d41"></a><!-- doxytag: member="QwtSpline::value" ref="1f67187eefe2959f0c902532edf64d41" args="(double x) const " --><p>
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          <td class="md" nowrap valign="top">double QwtSpline::value           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">double&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>x</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const</td>
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<p>
Calculate the interpolated function value corresponding to a given argument x. 
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Definition at line <a class="el" href="qwt__spline_8cpp-source.html#l00190">190</a> of file <a class="el" href="qwt__spline_8cpp-source.html">qwt_spline.cpp</a>.
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References <a class="el" href="qwt__spline_8h-source.html#l00121">d_data</a>.    </td>
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