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<title>Qwt User's Guide: QwtScaleTransformation Class Reference</title>
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<h1>QwtScaleTransformation Class Reference</h1><!-- doxytag: class="QwtScaleTransformation" -->Operations for linear or logarithmic (base 10) transformations.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="qwt__scale__map_8h-source.html">qwt_scale_map.h</a>></code>
<p>
<p>
<a href="class_qwt_scale_transformation-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><b>Type</b> { <br>
<b>Linear</b>,
<br>
<b>Log10</b>,
<br>
<b>Other</b>
<br>
}</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_scale_transformation.html#b1e8473584fe5146322fd4a745727a5f">QwtScaleTransformation</a> (Type type)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_transformation.html#2eccd8e538af9a3105f61f9f20a0ad8b">~QwtScaleTransformation</a> ()</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_scale_transformation.html#54768a41cd5d7867e74c0d0032e45ec2">xForm</a> (double x, double s1, double s2, double p1, double p2) const </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_scale_transformation.html#7e2ba833b068f941d79d443bee769b42">invXForm</a> (double x, double s1, double s2, double p1, double p2) const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">Type </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_transformation.html#8b8936e303f55241599ccbf358ab9215">type</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="class_qwt_scale_transformation.html">QwtScaleTransformation</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_transformation.html#ce4c90eefe778f87a11e0be1f27df0a6">copy</a> () const </td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
Operations for linear or logarithmic (base 10) transformations. <hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="b1e8473584fe5146322fd4a745727a5f"></a><!-- doxytag: member="QwtScaleTransformation::QwtScaleTransformation" ref="b1e8473584fe5146322fd4a745727a5f" args="(Type type)" -->
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<td class="memname">QwtScaleTransformation::QwtScaleTransformation </td>
<td>(</td>
<td class="paramtype">Type </td>
<td class="paramname"> <em>type</em> </td>
<td> ) </td>
<td></td>
</tr>
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<p>
Constructor for a linear transformation.
<p>
</div>
</div><p>
<a class="anchor" name="2eccd8e538af9a3105f61f9f20a0ad8b"></a><!-- doxytag: member="QwtScaleTransformation::~QwtScaleTransformation" ref="2eccd8e538af9a3105f61f9f20a0ad8b" args="()" -->
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<td class="memname">QwtScaleTransformation::~QwtScaleTransformation </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
</tr>
</table>
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<p>
Destructor.
<p>
</div>
</div><p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="ce4c90eefe778f87a11e0be1f27df0a6"></a><!-- doxytag: member="QwtScaleTransformation::copy" ref="ce4c90eefe778f87a11e0be1f27df0a6" args="() const " -->
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<td class="memname"><a class="el" href="class_qwt_scale_transformation.html">QwtScaleTransformation</a> * QwtScaleTransformation::copy </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [virtual]</code></td>
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<p>
Create a clone of the transformation.
<p>
</div>
</div><p>
<a class="anchor" name="7e2ba833b068f941d79d443bee769b42"></a><!-- doxytag: member="QwtScaleTransformation::invXForm" ref="7e2ba833b068f941d79d443bee769b42" args="(double x, double s1, double s2, double p1, double p2) const " -->
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<td class="memname">double QwtScaleTransformation::invXForm </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"> <em>p</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>p1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>p2</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>s1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>s2</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td> const<code> [virtual]</code></td>
</tr>
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<p>
Transform a value from a linear to a logarithmic interval.
<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> </td><td>value related to the linear interval [p1, p2] </td></tr>
<tr><td valign="top"></td><td valign="top"><em>p1</em> </td><td>first border of linear interval </td></tr>
<tr><td valign="top"></td><td valign="top"><em>p2</em> </td><td>first border of linear interval </td></tr>
<tr><td valign="top"></td><td valign="top"><em>s1</em> </td><td>first border of logarithmic interval </td></tr>
<tr><td valign="top"></td><td valign="top"><em>s2</em> </td><td>first border of logarithmic interval </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd><dl>
<dt>exp((x - p1) / (p2 - p1) * log(s2 / s1)) * s1; </dt>
<dd></dd>
</dl>
</dd></dl>
</div>
</div><p>
<a class="anchor" name="8b8936e303f55241599ccbf358ab9215"></a><!-- doxytag: member="QwtScaleTransformation::type" ref="8b8936e303f55241599ccbf358ab9215" args="() const " -->
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<td class="memname">Type QwtScaleTransformation::type </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
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</table>
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<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>Transformation type </dd></dl>
</div>
</div><p>
<a class="anchor" name="54768a41cd5d7867e74c0d0032e45ec2"></a><!-- doxytag: member="QwtScaleTransformation::xForm" ref="54768a41cd5d7867e74c0d0032e45ec2" args="(double x, double s1, double s2, double p1, double p2) const " -->
<div class="memitem">
<div class="memproto">
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<td class="memname">double QwtScaleTransformation::xForm </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"> <em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>s1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>s2</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>p1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>p2</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td> const<code> [virtual]</code></td>
</tr>
</table>
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<div class="memdoc">
<p>
Transform a value between 2 linear intervals.
<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> </td><td>value related to the interval [x1, x2] </td></tr>
<tr><td valign="top"></td><td valign="top"><em>x1</em> </td><td>first border of source interval </td></tr>
<tr><td valign="top"></td><td valign="top"><em>x2</em> </td><td>first border of source interval </td></tr>
<tr><td valign="top"></td><td valign="top"><em>y1</em> </td><td>first border of target interval </td></tr>
<tr><td valign="top"></td><td valign="top"><em>y2</em> </td><td>first border of target interval </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd><dl>
<dt>linear mapping:</dt>
<dd>y1 + (y2 - y1) / (x2 - x1) * (x - x1) </dd>
</dl>
<dl>
<dt>log10 mapping: </dt>
<dd>p1 + (p2 - p1) / log(s2 / s1) * log(x / s1) </dd>
</dl>
</dd></dl>
</div>
</div><p>
</div>
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