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<a href="#pub-types">Public Types</a> |
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<h1>QwtScaleTransformation Class Reference</h1> </div>
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<!-- doxytag: class="QwtScaleTransformation" -->
<p>A transformation between coordinate systems.
<a href="#_details">More...</a></p>
<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></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_transformation.html#a5b4e85a0640906586b3180872aaeb786">Type</a> { <br/>
  <a class="el" href="class_qwt_scale_transformation.html#a5b4e85a0640906586b3180872aaeb786a77fdca4fe1efe2e60f6f0d6d730c6075">Linear</a>,
<br/>
  <a class="el" href="class_qwt_scale_transformation.html#a5b4e85a0640906586b3180872aaeb786afd481a493e9324d472f2dd064f35f634">Log10</a>,
<br/>
  <a class="el" href="class_qwt_scale_transformation.html#a5b4e85a0640906586b3180872aaeb786a0bff96a69468f488f8096a3e12c9316c">Other</a>
<br/>
}</td></tr>
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" 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#ace4c90eefe778f87a11e0be1f27df0a6">copy</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_transformation.html#a366820cc9adb6678b2b613b8a7bc5fc7">invXForm</a> (double x, double p1, double p2, double s1, double s2) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_transformation.html#ab1e8473584fe5146322fd4a745727a5f">QwtScaleTransformation</a> (<a class="el" href="class_qwt_scale_transformation.html#a5b4e85a0640906586b3180872aaeb786">Type</a> type)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_scale_transformation.html#a5b4e85a0640906586b3180872aaeb786">Type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_transformation.html#acc7714bb6b6dbdb588f8170aee700621">type</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_transformation.html#a54768a41cd5d7867e74c0d0032e45ec2">xForm</a> (double x, double s1, double s2, double p1, double p2) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_transformation.html#a2eccd8e538af9a3105f61f9f20a0ad8b">~QwtScaleTransformation</a> ()</td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>A transformation between coordinate systems. </p>
<p><a class="el" href="class_qwt_scale_transformation.html" title="A transformation between coordinate systems.">QwtScaleTransformation</a> offers transformations from the coordinate system of a scale into the linear coordinate system of a paint device and vice versa. </p>
</div><hr/><h2>Member Enumeration Documentation</h2>
<a class="anchor" id="a5b4e85a0640906586b3180872aaeb786"></a><!-- doxytag: member="QwtScaleTransformation::Type" ref="a5b4e85a0640906586b3180872aaeb786" args="" -->
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<td class="memname">enum <a class="el" href="class_qwt_scale_transformation.html#a5b4e85a0640906586b3180872aaeb786">QwtScaleTransformation::Type</a></td>
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<p>Transformation type. </p>
<dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" id="a5b4e85a0640906586b3180872aaeb786a77fdca4fe1efe2e60f6f0d6d730c6075"></a><!-- doxytag: member="Linear" ref="a5b4e85a0640906586b3180872aaeb786a77fdca4fe1efe2e60f6f0d6d730c6075" args="" -->Linear</em> </td><td>
<p>Transformation between 2 linear scales. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="a5b4e85a0640906586b3180872aaeb786afd481a493e9324d472f2dd064f35f634"></a><!-- doxytag: member="Log10" ref="a5b4e85a0640906586b3180872aaeb786afd481a493e9324d472f2dd064f35f634" args="" -->Log10</em> </td><td>
<p>Transformation between a linear and a logarithmic ( base 10 ) scale. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="a5b4e85a0640906586b3180872aaeb786a0bff96a69468f488f8096a3e12c9316c"></a><!-- doxytag: member="Other" ref="a5b4e85a0640906586b3180872aaeb786a0bff96a69468f488f8096a3e12c9316c" args="" -->Other</em> </td><td>
<p>Any other type of transformation. </p>
</td></tr>
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</dd>
</dl>
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<hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="ab1e8473584fe5146322fd4a745727a5f"></a><!-- doxytag: member="QwtScaleTransformation::QwtScaleTransformation" ref="ab1e8473584fe5146322fd4a745727a5f" args="(Type type)" -->
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<td class="memname">QwtScaleTransformation::QwtScaleTransformation </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_qwt_scale_transformation.html#a5b4e85a0640906586b3180872aaeb786">Type</a> </td>
<td class="paramname"><em>type</em></td><td>)</td>
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<p>Constructor for a linear transformation. </p>
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</div>
<a class="anchor" id="a2eccd8e538af9a3105f61f9f20a0ad8b"></a><!-- doxytag: member="QwtScaleTransformation::~QwtScaleTransformation" ref="a2eccd8e538af9a3105f61f9f20a0ad8b" args="()" -->
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<td class="memname">QwtScaleTransformation::~QwtScaleTransformation </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td><code> [virtual]</code></td>
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<div class="memdoc">
<p>Destructor. </p>
</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="ace4c90eefe778f87a11e0be1f27df0a6"></a><!-- doxytag: member="QwtScaleTransformation::copy" ref="ace4c90eefe778f87a11e0be1f27df0a6" 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>
<a class="anchor" id="a366820cc9adb6678b2b613b8a7bc5fc7"></a><!-- doxytag: member="QwtScaleTransformation::invXForm" ref="a366820cc9adb6678b2b613b8a7bc5fc7" args="(double x, double p1, double p2, double s1, double s2) 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>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>p2</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>s1</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>s2</em> </td>
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<td></td>
<td>)</td>
<td></td><td> const<code> [virtual]</code></td>
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<p>Transform a value from the coordinate system of the paint device into the coordinate system of a scale. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">p</td><td>Value related to the coordinate system of the paint device </td></tr>
<tr><td class="paramname">p1</td><td>First border of the coordinate system of the paint device </td></tr>
<tr><td class="paramname">p2</td><td>Second border of the coordinate system of the paint device </td></tr>
<tr><td class="paramname">s1</td><td>First border of the coordinate system of the scale </td></tr>
<tr><td class="paramname">s2</td><td>Second border of the coordinate system of the scale </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd><dl>
<dt>linear mapping:</dt>
<dd>s1 + ( s2 - s1 ) / ( p2 - p1 ) * ( p - p1 ); </dd>
</dl>
<dl>
<dt>log10 mapping:</dt>
<dd>exp((p - p1) / (p2 - p1) * log(s2 / s1)) * s1; </dd>
</dl>
</dd></dl>
</div>
</div>
<a class="anchor" id="acc7714bb6b6dbdb588f8170aee700621"></a><!-- doxytag: member="QwtScaleTransformation::type" ref="acc7714bb6b6dbdb588f8170aee700621" args="() const " -->
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<td class="memname"><a class="el" href="class_qwt_scale_transformation.html#a5b4e85a0640906586b3180872aaeb786">QwtScaleTransformation::Type</a> QwtScaleTransformation::type </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const<code> [inline]</code></td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Transformation type </dd></dl>
</div>
</div>
<a class="anchor" id="a54768a41cd5d7867e74c0d0032e45ec2"></a><!-- doxytag: member="QwtScaleTransformation::xForm" ref="a54768a41cd5d7867e74c0d0032e45ec2" args="(double x, double s1, double s2, double p1, double p2) const " -->
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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>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const<code> [virtual]</code></td>
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<div class="memdoc">
<p>Transform a value from the coordinate system of a scale into the coordinate system of the paint device. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">s</td><td>Value related to the coordinate system of the scale </td></tr>
<tr><td class="paramname">s1</td><td>First border of the coordinate system of the scale </td></tr>
<tr><td class="paramname">s2</td><td>Second border of the coordinate system of the scale </td></tr>
<tr><td class="paramname">p1</td><td>First border of the coordinate system of the paint device </td></tr>
<tr><td class="paramname">p2</td><td>Second border of the coordinate system of the paint device </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd><dl>
<dt>linear mapping:</dt>
<dd>p1 + (p2 - p1) / (s2 - s1) * (s - s1); </dd>
</dl>
<dl>
<dt>log10 mapping: </dt>
<dd>p1 + (p2 - p1) / log(s2 / s1) * log(s / s1); </dd>
</dl>
</dd></dl>
</div>
</div>
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