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<title>Qwt User's Guide: QwtLog10ScaleEngine Class Reference</title>
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<h1>QwtLog10ScaleEngine Class Reference</h1><!-- doxytag: class="QwtLog10ScaleEngine" --><!-- doxytag: inherits="QwtScaleEngine" -->A scale engine for logarithmic (base 10) scales.
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<a href="#_details">More...</a>
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<code>#include <<a class="el" href="qwt__scale__engine_8h-source.html">qwt_scale_engine.h</a>></code>
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<div class="dynheader">
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Inheritance diagram for QwtLog10ScaleEngine:</div>
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<div class="dynsection">
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<p><center><img src="class_qwt_log10_scale_engine__inherit__graph.png" border="0" usemap="#_qwt_log10_scale_engine__inherit__map" alt="Inheritance graph"></center>
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<map name="_qwt_log10_scale_engine__inherit__map">
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<area shape="rect" href="class_qwt_scale_engine.html" title="Base class for scale engines." alt="" coords="26,8,146,32"></map>
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<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div>
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<a href="class_qwt_log10_scale_engine-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
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<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log10_scale_engine.html#bcab6bb8667f82dcdb656ad634976142">autoScale</a> (int maxSteps, double &x1, double &x2, double &stepSize) const </td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="class_qwt_scale_div.html">QwtScaleDiv</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log10_scale_engine.html#e46745d561ce2ac583bb44e94f0fc7d6">divideScale</a> (double x1, double x2, int numMajorSteps, int numMinorSteps, double stepSize=0.0) const </td></tr>
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<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_log10_scale_engine.html#f972778615ea076c8452abea96516ce9">transformation</a> () const </td></tr>
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<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log10_scale_engine.html#1d3abcbe5ce63d7f9cfa5a04c028bf55">log10</a> (const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> &) const </td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_log10_scale_engine.html#f08b0486afd765554702f4c237302985">pow10</a> (const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> &) const </td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
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A scale engine for logarithmic (base 10) scales.
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The step size is measured in *decades* and the major step size will be adjusted to fit the pattern <img class="formulaInl" alt="$\left\{ 1,2,3,5\right\} \cdot 10^{n}$" src="form_3.png">, where n is a natural number including zero.<p>
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<dl class="warning" compact><dt><b>Warning:</b></dt><dd>the step size as well as the margins are measured in *decades*. </dd></dl>
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<hr><h2>Member Function Documentation</h2>
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<a class="anchor" name="bcab6bb8667f82dcdb656ad634976142"></a><!-- doxytag: member="QwtLog10ScaleEngine::autoScale" ref="bcab6bb8667f82dcdb656ad634976142" args="(int maxSteps, double &x1, double &x2, double &stepSize) const " -->
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<div class="memproto">
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<td class="memname">void QwtLog10ScaleEngine::autoScale </td>
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<td class="paramtype">int </td>
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<td class="paramname"> <em>maxNumSteps</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double & </td>
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<td class="paramname"> <em>x1</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double & </td>
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<td class="paramname"> <em>x2</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double & </td>
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<td class="paramname"> <em>stepSize</em></td><td> </td>
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<td></td><td></td><td> const<code> [virtual]</code></td>
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Align and divide an interval<p>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>maxNumSteps</em> </td><td>Max. number of steps </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>x1</em> </td><td>First limit of the interval (In/Out) </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>x2</em> </td><td>Second limit of the interval (In/Out) </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>stepSize</em> </td><td>Step size (Out)</td></tr>
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#cf02a88f6e778edbc9e005960f35b3b7">QwtScaleEngine::setAttribute()</a> </dd></dl>
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<p>Implements <a class="el" href="class_qwt_scale_engine.html#a27323d6d9d5348bd253a61b45e4785b">QwtScaleEngine</a>.</p>
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<a class="anchor" name="e46745d561ce2ac583bb44e94f0fc7d6"></a><!-- doxytag: member="QwtLog10ScaleEngine::divideScale" ref="e46745d561ce2ac583bb44e94f0fc7d6" args="(double x1, double x2, int numMajorSteps, int numMinorSteps, double stepSize=0.0) const " -->
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<div class="memitem">
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<td class="memname"><a class="el" href="class_qwt_scale_div.html">QwtScaleDiv</a> QwtLog10ScaleEngine::divideScale </td>
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<td class="paramtype">double </td>
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<td class="paramname"> <em>x1</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double </td>
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<td class="paramname"> <em>x2</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int </td>
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<td class="paramname"> <em>maxMajSteps</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int </td>
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<td class="paramname"> <em>maxMinSteps</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double </td>
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<td class="paramname"> <em>stepSize</em> = <code>0.0</code></td><td> </td>
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<td></td><td></td><td> const<code> [virtual]</code></td>
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Calculate a scale division.
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>x1</em> </td><td>First interval limit </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>x2</em> </td><td>Second interval limit </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>maxMajSteps</em> </td><td>Maximum for the number of major steps </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>maxMinSteps</em> </td><td>Maximum number of minor steps </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>stepSize</em> </td><td>Step size. If stepSize == 0, the scaleEngine calculates one.</td></tr>
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<dl class="see" compact><dt><b>See also:</b></dt><dd>QwtScaleEngine::stepSize(), QwtLog10ScaleEngine::subDivide() </dd></dl>
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<p>Implements <a class="el" href="class_qwt_scale_engine.html#833fbdad4cce6e3b6448ee2549dc09e1">QwtScaleEngine</a>.</p>
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<a class="anchor" name="1d3abcbe5ce63d7f9cfa5a04c028bf55"></a><!-- doxytag: member="QwtLog10ScaleEngine::log10" ref="1d3abcbe5ce63d7f9cfa5a04c028bf55" args="(const QwtDoubleInterval &) const " -->
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<td class="memname"><a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> QwtLog10ScaleEngine::log10 </td>
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<td class="paramtype">const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> & </td>
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<td class="paramname"> <em>interval</em> </td>
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<td> ) </td>
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<td> const<code> [protected]</code></td>
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Return the interval [log10(interval.minValue(), log10(interval.maxValue]
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<a class="anchor" name="f08b0486afd765554702f4c237302985"></a><!-- doxytag: member="QwtLog10ScaleEngine::pow10" ref="f08b0486afd765554702f4c237302985" args="(const QwtDoubleInterval &) const " -->
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<td class="memname"><a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> QwtLog10ScaleEngine::pow10 </td>
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<td class="paramtype">const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> & </td>
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<td class="paramname"> <em>interval</em> </td>
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<td> ) </td>
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<td> const<code> [protected]</code></td>
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Return the interval [pow10(interval.minValue(), pow10(interval.maxValue]
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<a class="anchor" name="f972778615ea076c8452abea96516ce9"></a><!-- doxytag: member="QwtLog10ScaleEngine::transformation" ref="f972778615ea076c8452abea96516ce9" args="() const " -->
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<td class="memname"><a class="el" href="class_qwt_scale_transformation.html">QwtScaleTransformation</a> * QwtLog10ScaleEngine::transformation </td>
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<td class="paramname"> </td>
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<td> ) </td>
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<td> const<code> [virtual]</code></td>
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Return a transformation, for logarithmic (base 10) scales
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<p>Implements <a class="el" href="class_qwt_scale_engine.html#04a93d0dc39a3483957764e7749989fd">QwtScaleEngine</a>.</p>
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