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<div class="title">QwtLogTransform Class Reference</div> </div>
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<p>Logarithmic transformation.
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<a href="class_qwt_log_transform.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="qwt__transform_8h_source.html">qwt_transform.h</a>></code></p>
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Inheritance diagram for QwtLogTransform:</div>
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<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:ae38156a50ab292af9638a78a374c30ff"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae38156a50ab292af9638a78a374c30ff"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log_transform.html#ae38156a50ab292af9638a78a374c30ff">QwtLogTransform</a> ()</td></tr>
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<tr class="memdesc:ae38156a50ab292af9638a78a374c30ff"><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <br /></td></tr>
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<tr class="separator:ae38156a50ab292af9638a78a374c30ff"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a39296a96bd30f5ea8f22cb79456c23f0"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a39296a96bd30f5ea8f22cb79456c23f0"></a>
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virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log_transform.html#a39296a96bd30f5ea8f22cb79456c23f0">~QwtLogTransform</a> ()</td></tr>
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<tr class="memdesc:a39296a96bd30f5ea8f22cb79456c23f0"><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br /></td></tr>
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<tr class="separator:a39296a96bd30f5ea8f22cb79456c23f0"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ae13d9e1c7a71fd50afe2e804d2a2fb15"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log_transform.html#ae13d9e1c7a71fd50afe2e804d2a2fb15">transform</a> (double value) const </td></tr>
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<tr class="separator:ae13d9e1c7a71fd50afe2e804d2a2fb15"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a7c9e1e11e9708aecef2df4dac0c7d56b"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log_transform.html#a7c9e1e11e9708aecef2df4dac0c7d56b">invTransform</a> (double value) const </td></tr>
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<tr class="separator:a7c9e1e11e9708aecef2df4dac0c7d56b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab98c0508df005438dea8baa6c512b799"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log_transform.html#ab98c0508df005438dea8baa6c512b799">bounded</a> (double value) const </td></tr>
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<tr class="memitem:a16c5031b6e252462b0e611d4a54b55f5"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="class_qwt_transform.html">QwtTransform</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log_transform.html#a16c5031b6e252462b0e611d4a54b55f5">copy</a> () const </td></tr>
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<tr class="separator:a16c5031b6e252462b0e611d4a54b55f5"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="inherit_header pub_methods_class_qwt_transform"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_qwt_transform')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="class_qwt_transform.html">QwtTransform</a></td></tr>
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<tr class="memitem:aa1fa1ab21d0fc01e06d3a6e462008d0b inherit pub_methods_class_qwt_transform"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aa1fa1ab21d0fc01e06d3a6e462008d0b"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_transform.html#aa1fa1ab21d0fc01e06d3a6e462008d0b">QwtTransform</a> ()</td></tr>
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<tr class="memdesc:aa1fa1ab21d0fc01e06d3a6e462008d0b inherit pub_methods_class_qwt_transform"><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <br /></td></tr>
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<tr class="separator:aa1fa1ab21d0fc01e06d3a6e462008d0b inherit pub_methods_class_qwt_transform"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa2653db3104e672464dc569592fc14ab inherit pub_methods_class_qwt_transform"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aa2653db3104e672464dc569592fc14ab"></a>
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virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_transform.html#aa2653db3104e672464dc569592fc14ab">~QwtTransform</a> ()</td></tr>
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<tr class="memdesc:aa2653db3104e672464dc569592fc14ab inherit pub_methods_class_qwt_transform"><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br /></td></tr>
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<tr class="separator:aa2653db3104e672464dc569592fc14ab inherit pub_methods_class_qwt_transform"><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-attribs"></a>
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Public Attributes</h2></td></tr>
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<tr class="memitem:ad16ce32a68b714955412dc8b1b8f6622"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad16ce32a68b714955412dc8b1b8f6622"></a>
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QT_STATIC_CONST double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log_transform.html#ad16ce32a68b714955412dc8b1b8f6622">LogMin</a> = 1.0e-150</td></tr>
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<tr class="memdesc:ad16ce32a68b714955412dc8b1b8f6622"><td class="mdescLeft"> </td><td class="mdescRight">Smallest allowed value for logarithmic scales: 1.0e-150. <br /></td></tr>
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<tr class="separator:ad16ce32a68b714955412dc8b1b8f6622"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ae5b7d96e9a765986cf1fc4b4c1fc7915"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae5b7d96e9a765986cf1fc4b4c1fc7915"></a>
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QT_STATIC_CONST double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log_transform.html#ae5b7d96e9a765986cf1fc4b4c1fc7915">LogMax</a> = 1.0e150</td></tr>
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<tr class="memdesc:ae5b7d96e9a765986cf1fc4b4c1fc7915"><td class="mdescLeft"> </td><td class="mdescRight">Largest allowed value for logarithmic scales: 1.0e150. <br /></td></tr>
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<tr class="separator:ae5b7d96e9a765986cf1fc4b4c1fc7915"><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>Logarithmic transformation. </p>
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<p><a class="el" href="class_qwt_log_transform.html" title="Logarithmic transformation. ">QwtLogTransform</a> modifies the values using log() and exp().</p>
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<dl class="section note"><dt>Note</dt><dd>In the calculations of <a class="el" href="class_qwt_scale_map.html" title="A scale map. ">QwtScaleMap</a> the base of the log function has no effect on the mapping. So <a class="el" href="class_qwt_log_transform.html" title="Logarithmic transformation. ">QwtLogTransform</a> can be used for log2(), log10() or any other logarithmic scale. </dd></dl>
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</div><h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">double QwtLogTransform::bounded </td>
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<td>(</td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>value</em></td><td>)</td>
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<td> const</td>
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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">value</td><td>Value to be bounded </td></tr>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>qBound( LogMin, value, LogMax ) </dd></dl>
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<p>Reimplemented from <a class="el" href="class_qwt_transform.html#a2703fc5855720201f46ed9404271a527">QwtTransform</a>.</p>
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<td class="memname"><a class="el" href="class_qwt_transform.html">QwtTransform</a> * QwtLogTransform::copy </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td> const</td>
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<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
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<dl class="section return"><dt>Returns</dt><dd>Clone of the transformation </dd></dl>
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<p>Implements <a class="el" href="class_qwt_transform.html#a2736acb99a26c51eec090456910c145f">QwtTransform</a>.</p>
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<td class="memname">double QwtLogTransform::invTransform </td>
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<td>(</td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>value</em></td><td>)</td>
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<td> const</td>
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<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
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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">value</td><td>Value to be transformed </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>exp( value ) </dd></dl>
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<p>Implements <a class="el" href="class_qwt_transform.html#a078578d562a1f76555f7b3446d1724e0">QwtTransform</a>.</p>
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<td class="memname">double QwtLogTransform::transform </td>
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<td>(</td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>value</em></td><td>)</td>
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<td> const</td>
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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">value</td><td>Value to be transformed </td></tr>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>log( value ) </dd></dl>
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<p>Implements <a class="el" href="class_qwt_transform.html#a7ca5657c4722b4d39eb57bf5459c2fd0">QwtTransform</a>.</p>
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