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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: QwtLinearScaleEngine 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>QwtLinearScaleEngine Class Reference</h1><!-- doxytag: class="QwtLinearScaleEngine" --><!-- doxytag: inherits="QwtScaleEngine" -->Inheritance diagram for QwtLinearScaleEngine:<p><center><img src="class_qwt_linear_scale_engine__inherit__graph.png" border="0" usemap="#_qwt_linear_scale_engine__inherit__map" alt="Inheritance graph"></center><map name="_qwt_linear_scale_engine__inherit__map"><area href="class_qwt_scale_engine.html" shape="rect" coords="26,8,146,32" alt=""></map><center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center>Collaboration diagram for QwtLinearScaleEngine:<p><center><img src="class_qwt_linear_scale_engine__coll__graph.png" border="0" usemap="#_qwt_linear_scale_engine__coll__map" alt="Collaboration graph"></center><map name="_qwt_linear_scale_engine__coll__map"><area href="class_qwt_scale_engine.html" shape="rect" coords="26,8,146,32" alt=""></map><center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="class_qwt_linear_scale_engine-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>A scale engine for linear scales. <p>The step size will fit into the pattern <img class="formulaInl" alt="$\left\{ 1,2,5\right\} \cdot 10^{n}$" src="form_1.png">, where n is an integer. <p><p>Definition at line <a class="el" href="qwt__scale__engine_8h-source.html#l00126">126</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_linear_scale_engine.html#d0f1d825e70eb7a1deb15875a8093cff">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_linear_scale_engine.html#afed94c688e67c95a6ecf18e8bb522ab">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_linear_scale_engine.html#db24f92fa0e8c0548a38cd310158b3d3">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_linear_scale_engine.html#152ccac12d8782b43b7a82061a4e1947">align</a> (const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> &, double stepSize) const </td></tr></table><hr><h2>Member Function Documentation</h2><a class="anchor" name="152ccac12d8782b43b7a82061a4e1947"></a><!-- doxytag: member="QwtLinearScaleEngine::align" ref="152ccac12d8782b43b7a82061a4e1947" args="(const QwtDoubleInterval &, 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"><a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> QwtLinearScaleEngine::align </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> & </td> <td class="mdname" nowrap> <em>interval</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> [protected]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Align an interval to a step size. <p>The limits of an interval are aligned that both are integer multiples of the step size.<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>interval</em> </td><td>Interval </td></tr> <tr><td valign="top"></td><td valign="top"><em>stepSize</em> </td><td>Step size</td></tr> </table></dl><dl compact><dt><b>Returns:</b></dt><dd>Aligned interval </dd></dl><p>Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00607">607</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#l00050">QwtScaleArithmetic::ceilEps()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00067">QwtScaleArithmetic::floorEps()</a>, <a class="el" href="qwt__double__interval_8h-source.html#l00134">QwtDoubleInterval::maxValue()</a>, and <a class="el" href="qwt__double__interval_8h-source.html#l00128">QwtDoubleInterval::minValue()</a>.<p>Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00423">autoScale()</a>. </td> </tr></table><a class="anchor" name="d0f1d825e70eb7a1deb15875a8093cff"></a><!-- doxytag: member="QwtLinearScaleEngine::autoScale" ref="d0f1d825e70eb7a1deb15875a8093cff" 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 QwtLinearScaleEngine::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>⌨️ 快捷键说明
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