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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: QwtScaleEngine 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>QwtScaleEngine Class Reference</h1><!-- doxytag: class="QwtScaleEngine" -->Inheritance diagram for QwtScaleEngine:<p><center><img src="class_qwt_scale_engine__inherit__graph.png" border="0" usemap="#_qwt_scale_engine__inherit__map" alt="Inheritance graph"></center><map name="_qwt_scale_engine__inherit__map"><area href="class_qwt_linear_scale_engine.html" shape="rect" coords="7,83,164,107" alt=""><area href="class_qwt_log10_scale_engine.html" shape="rect" coords="188,83,343,107" alt=""></map><center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="class_qwt_scale_engine-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>Base class for scale engines. <p>A scale engine trys to find "reasonable" ranges and step sizes for scales.<p>The layout of the scale can be varied with setOptions().<p>Qwt offers implementations for logarithmic (log10) and linear scales. Contributions for other types of scale engines (date/time, log2 ... ) are welcome. <p><p>Definition at line <a class="el" href="qwt__scale__engine_8h-source.html#l00050">50</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 Types</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a> { <br> <b>NoAttribute</b> = 0, <br> <b>IncludeReference</b> = 1, <br> <b>Symmetric</b> = 2, <br> <b>Floating</b> = 4, <br> <b>Inverted</b> = 8<br> }</td></tr><tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#58cb9344a913fa798ac7343d55f3f693">QwtScaleEngine</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#b9c21b4550d44d9a82c1865864cb8943">~QwtScaleEngine</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#cf02a88f6e778edbc9e005960f35b3b7">setAttribute</a> (<a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>, bool on=true)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#b43cac5ff8843531bbb02b4401e8fb62">testAttribute</a> (<a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#d221d715e28e644975c6cbda9cae492e">setAttributes</a> (int)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#3e8d3101af3dbab7a97b96779118e428">attributes</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#89985ea69dbd858c8b9162ecd2be936e">setReference</a> (double reference)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#5962458870865df797e84e3bd6badf02">reference</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#d6e83875e5e7a65b005ebb6213e1e869">setMargins</a> (double m1, double m2)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#51447104ab614a157c2bac6a0f0f7dc9">loMargin</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#a1e2d260975cef6546a3829213bc5f2f">hiMargin</a> () const </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_scale_engine.html#a27323d6d9d5348bd253a61b45e4785b">autoScale</a> (int maxNumSteps, double &x1, double &x2, double &stepSize) const =0</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_scale_engine.html#833fbdad4cce6e3b6448ee2549dc09e1">divideScale</a> (double x1, double x2, int maxMajSteps, int maxMinSteps, double stepSize=0.0) const =0</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_scale_engine.html#04a93d0dc39a3483957764e7749989fd">transformation</a> () const =0</td></tr><tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#fb902375924c862f1058f77bb7a7029e">contains</a> (const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> &, double val) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">QwtValueList </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#f4522cd83e7885f19d35579d42fbc1fc">strip</a> (const QwtValueList &, const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> &) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#ff30158c5ccfee78f4c3e01c0fb5f4de">divideInterval</a> (double interval, int numSteps) 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_scale_engine.html#f06bc397d46b40c69fe5c82b7f2c3267">buildInterval</a> (double v) const </td></tr></table><hr><h2>Member Enumeration Documentation</h2><a class="anchor" name="7548418e0896d75eec164bfa2ba3ff5f"></a><!-- doxytag: member="QwtScaleEngine::Attribute" ref="7548418e0896d75eec164bfa2ba3ff5f" args="" --><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">enum <a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">QwtScaleEngine::Attribute</a> </td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>see QwtScaleEngine::setOption, testOption <p><p>Definition at line <a class="el" href="qwt__scale__engine_8h-source.html#l00054">54</a> of file <a class="el" href="qwt__scale__engine_8h-source.html">qwt_scale_engine.h</a>. </td> </tr></table><hr><h2>Constructor & Destructor Documentation</h2><a class="anchor" name="58cb9344a913fa798ac7343d55f3f693"></a><!-- doxytag: member="QwtScaleEngine::QwtScaleEngine" ref="58cb9344a913fa798ac7343d55f3f693" args="()" --><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">QwtScaleEngine::QwtScaleEngine </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap><code> [explicit]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Ctor. <p><p>Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00169">169</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>. </td> </tr></table><a class="anchor" name="b9c21b4550d44d9a82c1865864cb8943"></a><!-- doxytag: member="QwtScaleEngine::~QwtScaleEngine" ref="b9c21b4550d44d9a82c1865864cb8943" args="()" --><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">QwtScaleEngine::~QwtScaleEngine </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap><code> [virtual]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Dtor. <p><p>Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00176">176</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>. </td> </tr></table><hr><h2>Member Function Documentation</h2><a class="anchor" name="3e8d3101af3dbab7a97b96779118e428"></a><!-- doxytag: member="QwtScaleEngine::attributes" ref="3e8d3101af3dbab7a97b96779118e428" args="() 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">int QwtScaleEngine::attributes </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> const</td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Return the scale attributes <p>Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00379">379</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.<p>Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00693">QwtLog10ScaleEngine::divideScale()</a>. </td> </tr></table><a class="anchor" name="a27323d6d9d5348bd253a61b45e4785b"></a><!-- doxytag: member="QwtScaleEngine::autoScale" ref="a27323d6d9d5348bd253a61b45e4785b" args="(int maxNumSteps, double &x1, double &x2, double &stepSize) const =0" --><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">virtual void QwtScaleEngine::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> [pure 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 (Return value) </td></tr> </table></dl><p>Implemented in <a class="el" href="class_qwt_linear_scale_engine.html#d0f1d825e70eb7a1deb15875a8093cff">QwtLinearScaleEngine</a>, and <a class="el" href="class_qwt_log10_scale_engine.html#bcab6bb8667f82dcdb656ad634976142">QwtLog10ScaleEngine</a>. </td> </tr></table><a class="anchor" name="f06bc397d46b40c69fe5c82b7f2c3267"></a><!-- doxytag: member="QwtScaleEngine::buildInterval" ref="f06bc397d46b40c69fe5c82b7f2c3267" args="(double v) 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> QwtScaleEngine::buildInterval </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">double </td> <td class="mdname1" valign="top" nowrap> <em>v</em> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> const<code> [protected]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td>⌨️ 快捷键说明
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