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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Qwt User's Guide: QwtLog10ScaleEngine Class Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.6 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li id="current"><a href="classes.html"><span>Classes</span></a></li> <li><a href="files.html"><span>Files</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="classes.html"><span>Alphabetical List</span></a></li> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="hierarchy.html"><span>Class Hierarchy</span></a></li> <li><a href="functions.html"><span>Class Members</span></a></li> </ul></div><h1>QwtLog10ScaleEngine Class Reference</h1><!-- doxytag: class="QwtLog10ScaleEngine" --><!-- doxytag: inherits="QwtScaleEngine" -->Inheritance diagram for QwtLog10ScaleEngine:<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><map name="_qwt_log10_scale_engine__inherit__map"><area href="class_qwt_scale_engine.html" shape="rect" coords="24,8,144,32" alt=""></map><center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center>Collaboration diagram for QwtLog10ScaleEngine:<p><center><img src="class_qwt_log10_scale_engine__coll__graph.png" border="0" usemap="#_qwt_log10_scale_engine__coll__map" alt="Collaboration graph"></center><map name="_qwt_log10_scale_engine__coll__map"><area href="class_qwt_scale_engine.html" shape="rect" coords="24,8,144,32" alt=""></map><center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="class_qwt_log10_scale_engine-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>A scale engine for logarithmic (base 10) scales. <p>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_2.png">, where n is a natural number including zero.<p><dl compact><dt><b>Warning:</b></dt><dd>the step size as well as the margins are measured in *decades*. </dd></dl><p><p>Definition at line <a class="el" href="qwt__scale__engine_8h-source.html#l00167">167</a> of file <a class="el" href="qwt__scale__engine_8h-source.html">qwt_scale_engine.h</a>.<table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr><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><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><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><tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr><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><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></table><hr><h2>Member Function Documentation</h2><a class="anchor" name="bcab6bb8667f82dcdb656ad634976142"></a><!-- doxytag: member="QwtLog10ScaleEngine::autoScale" ref="bcab6bb8667f82dcdb656ad634976142" args="(int maxSteps, double &x1, double &x2, double &stepSize) const " --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">void QwtLog10ScaleEngine::autoScale </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">int </td> <td class="mdname" nowrap> <em>maxNumSteps</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>double & </td> <td class="mdname" nowrap> <em>x1</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>double & </td> <td class="mdname" nowrap> <em>x2</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>double & </td> <td class="mdname" nowrap> <em>stepSize</em></td> </tr> <tr> <td class="md"></td> <td class="md">) </td> <td class="md" colspan="2"> const<code> [virtual]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Align and divide an 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>maxNumSteps</em> </td><td>Max. number of steps </td></tr> <tr><td valign="top"></td><td valign="top"><em>x1</em> </td><td>First limit of the interval (In/Out) </td></tr> <tr><td valign="top"></td><td valign="top"><em>x2</em> </td><td>Second limit of the interval (In/Out) </td></tr> <tr><td valign="top"></td><td valign="top"><em>stepSize</em> </td><td>Step size (Out)</td></tr> </table></dl><dl compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#cf02a88f6e778edbc9e005960f35b3b7">QwtScaleEngine::setAttribute</a> </dd></dl><p>Implements <a class="el" href="class_qwt_scale_engine.html#a27323d6d9d5348bd253a61b45e4785b">QwtScaleEngine</a>.<p>Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00636">636</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.<p>References <a class="el" href="qwt__scale__engine_8cpp-source.html#l00309">QwtScaleEngine::buildInterval()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00233">QwtScaleEngine::divideInterval()</a>, <a class="el" href="qwt__double__interval_8cpp-source.html#l00185">QwtDoubleInterval::extend()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00198">QwtScaleEngine::hiMargin()</a>, <a class="el" href="qwt__double__interval_8cpp-source.html#l00159">QwtDoubleInterval::limited()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00899">log10()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00187">QwtScaleEngine::loMargin()</a>, <a class="el" href="qwt__double__interval_8h-source.html#l00134">QwtDoubleInterval::maxValue()</a>, <a class="el" href="qwt__double__interval_8h-source.html#l00128">QwtDoubleInterval::minValue()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00400">QwtScaleEngine::reference()</a>, <a class="el" href="qwt__double__interval_8h-source.html#l00101">QwtDoubleInterval::setInterval()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00360">QwtScaleEngine::testAttribute()</a>, and <a class="el" href="qwt__double__interval_8h-source.html#l00146">QwtDoubleInterval::width()</a>. </td> </tr></table><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 " --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top"><a class="el" href="class_qwt_scale_div.html">QwtScaleDiv</a> QwtLog10ScaleEngine::divideScale </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">double </td> <td class="mdname" nowrap> <em>x1</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>double </td> <td class="mdname" nowrap> <em>x2</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>int </td> <td class="mdname" nowrap> <em>maxMajSteps</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>int </td> <td class="mdname" nowrap> <em>maxMinSteps</em>, </td> </tr>⌨️ 快捷键说明
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