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qwt-cmake/doc/html/class_qwt_transform.html
Wodann a94503cb82 Released version 6.1.3
2018-08-02 11:01:31 -04:00

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<p>A transformation between coordinate systems.
<a href="class_qwt_transform.html#details">More...</a></p>
<p><code>#include &lt;<a class="el" href="qwt__transform_8h_source.html">qwt_transform.h</a>&gt;</code></p>
<div class="dynheader">
Inheritance diagram for QwtTransform:</div>
<div class="dyncontent">
<div class="center"><img src="class_qwt_transform__inherit__graph.png" border="0" usemap="#_qwt_transform_inherit__map" alt="Inheritance graph"/></div>
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<area shape="rect" id="node2" href="class_qwt_log_transform.html" title="Logarithmic transformation. " alt="" coords="5,80,136,107"/>
<area shape="rect" id="node3" href="class_qwt_null_transform.html" title="Null transformation. " alt="" coords="159,80,289,107"/>
<area shape="rect" id="node4" href="class_qwt_power_transform.html" title="A transformation using pow() " alt="" coords="313,80,460,107"/>
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<center><span class="legend">[<a target="top" href="graph_legend.html">legend</a>]</span></center></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:aa1fa1ab21d0fc01e06d3a6e462008d0b"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aa1fa1ab21d0fc01e06d3a6e462008d0b"></a>
&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_transform.html#aa1fa1ab21d0fc01e06d3a6e462008d0b">QwtTransform</a> ()</td></tr>
<tr class="memdesc:aa1fa1ab21d0fc01e06d3a6e462008d0b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Constructor. <br /></td></tr>
<tr class="separator:aa1fa1ab21d0fc01e06d3a6e462008d0b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa2653db3104e672464dc569592fc14ab"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aa2653db3104e672464dc569592fc14ab"></a>
virtual&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_transform.html#aa2653db3104e672464dc569592fc14ab">~QwtTransform</a> ()</td></tr>
<tr class="memdesc:aa2653db3104e672464dc569592fc14ab"><td class="mdescLeft">&#160;</td><td class="mdescRight">Destructor. <br /></td></tr>
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<tr class="memitem:a2703fc5855720201f46ed9404271a527"><td class="memItemLeft" align="right" valign="top">virtual double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_transform.html#a2703fc5855720201f46ed9404271a527">bounded</a> (double value) const </td></tr>
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<tr class="memitem:a7ca5657c4722b4d39eb57bf5459c2fd0"><td class="memItemLeft" align="right" valign="top">virtual double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_transform.html#a7ca5657c4722b4d39eb57bf5459c2fd0">transform</a> (double value) const =0</td></tr>
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<tr class="memitem:a078578d562a1f76555f7b3446d1724e0"><td class="memItemLeft" align="right" valign="top">virtual double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_transform.html#a078578d562a1f76555f7b3446d1724e0">invTransform</a> (double value) const =0</td></tr>
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virtual <a class="el" href="class_qwt_transform.html">QwtTransform</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_transform.html#a2736acb99a26c51eec090456910c145f">copy</a> () const =0</td></tr>
<tr class="memdesc:a2736acb99a26c51eec090456910c145f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Virtualized copy operation. <br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A transformation between coordinate systems. </p>
<p><a class="el" href="class_qwt_transform.html" title="A transformation between coordinate systems. ">QwtTransform</a> manipulates values, when being mapped between the scale and the paint device coordinate system.</p>
<p>A transformation consists of 2 methods:</p>
<ul>
<li>transform</li>
<li>invTransform</li>
</ul>
<p>where one is is the inverse function of the other.</p>
<p>When p1, p2 are the boundaries of the paint device coordinates and s1, s2 the boundaries of the scale, <a class="el" href="class_qwt_scale_map.html" title="A scale map. ">QwtScaleMap</a> uses the following calculations:</p>
<ul>
<li>p = p1 + ( p2 - p1 ) * ( T( s ) - T( s1 ) / ( T( s2 ) - T( s1 ) );</li>
<li>s = invT ( T( s1 ) + ( T( s2 ) - T( s1 ) ) * ( p - p1 ) / ( p2 - p1 ) ); </li>
</ul>
</div><h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">double QwtTransform::bounded </td>
<td>(</td>
<td class="paramtype">double&#160;</td>
<td class="paramname"><em>value</em></td><td>)</td>
<td> const</td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
</tr>
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<p>Modify value to be a valid value for the transformation. The default implementation does nothing.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">value</td><td>Value to be bounded </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>value unmodified </dd></dl>
<p>Reimplemented in <a class="el" href="class_qwt_log_transform.html#ab98c0508df005438dea8baa6c512b799">QwtLogTransform</a>.</p>
</div>
</div>
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<td class="memname">virtual double QwtTransform::invTransform </td>
<td>(</td>
<td class="paramtype">double&#160;</td>
<td class="paramname"><em>value</em></td><td>)</td>
<td> const</td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">pure virtual</span></span> </td>
</tr>
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<p>Inverse transformation function</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">value</td><td>Value </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Modified value</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_transform.html#a7ca5657c4722b4d39eb57bf5459c2fd0">transform()</a> </dd></dl>
<p>Implemented in <a class="el" href="class_qwt_power_transform.html#aae19e2002b08ab09ed177d8ff6753f82">QwtPowerTransform</a>, <a class="el" href="class_qwt_log_transform.html#a7c9e1e11e9708aecef2df4dac0c7d56b">QwtLogTransform</a>, and <a class="el" href="class_qwt_null_transform.html#aa52cc18dcd1d0cd37a950fb71ef68a1c">QwtNullTransform</a>.</p>
</div>
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<a class="anchor" id="a7ca5657c4722b4d39eb57bf5459c2fd0"></a>
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<td class="memname">virtual double QwtTransform::transform </td>
<td>(</td>
<td class="paramtype">double&#160;</td>
<td class="paramname"><em>value</em></td><td>)</td>
<td> const</td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">pure virtual</span></span> </td>
</tr>
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</div><div class="memdoc">
<p>Transformation function</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">value</td><td>Value </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Modified value</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_transform.html#a078578d562a1f76555f7b3446d1724e0">invTransform()</a> </dd></dl>
<p>Implemented in <a class="el" href="class_qwt_power_transform.html#aad3892cb63f5981521184960e240a4f3">QwtPowerTransform</a>, <a class="el" href="class_qwt_log_transform.html#ae13d9e1c7a71fd50afe2e804d2a2fb15">QwtLogTransform</a>, and <a class="el" href="class_qwt_null_transform.html#abf4fa9a536049e6da78e71d5f8485b4e">QwtNullTransform</a>.</p>
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