<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>Qwt User's Guide: QwtLinearScaleEngine Class Reference</title> <link href="tabs.css" rel="stylesheet" type="text/css"> <link href="doxygen.css" rel="stylesheet" type="text/css"> </head><body> <!-- Generated by Doxygen 1.5.8 --> <div class="navigation" id="top"> <div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> <li class="current"><a href="annotated.html"><span>Classes</span></a></li> <li><a href="files.html"><span>Files</span></a></li> </ul> </div> <div class="tabs"> <ul> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="classes.html"><span>Class Index</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> </div> <div class="contents"> <h1>QwtLinearScaleEngine Class Reference</h1><!-- doxytag: class="QwtLinearScaleEngine" --><!-- doxytag: inherits="QwtScaleEngine" -->A scale engine for linear scales. <a href="#_details">More...</a> <p> <code>#include <<a class="el" href="qwt__scale__engine_8h-source.html">qwt_scale_engine.h</a>></code> <p> <div class="dynheader"> Inheritance diagram for QwtLinearScaleEngine:</div> <div class="dynsection"> <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 shape="rect" href="class_qwt_scale_engine.html" title="Base class for scale engines." alt="" coords="26,8,146,32"></map> <center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div> <p> <a href="class_qwt_linear_scale_engine-members.html">List of all members.</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><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_2.png">, where n is an integer. <hr><h2>Member Function Documentation</h2> <a class="anchor" name="152ccac12d8782b43b7a82061a4e1947"></a><!-- doxytag: member="QwtLinearScaleEngine::align" ref="152ccac12d8782b43b7a82061a4e1947" args="(const QwtDoubleInterval &, double stepSize) const " --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> QwtLinearScaleEngine::align </td> <td>(</td> <td class="paramtype">const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> & </td> <td class="paramname"> <em>interval</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">double </td> <td class="paramname"> <em>stepSize</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td> const<code> [protected]</code></td> </tr> </table> </div> <div class="memdoc"> <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 class="return" compact><dt><b>Returns:</b></dt><dd>Aligned interval </dd></dl> </div> </div><p> <a class="anchor" name="d0f1d825e70eb7a1deb15875a8093cff"></a><!-- doxytag: member="QwtLinearScaleEngine::autoScale" ref="d0f1d825e70eb7a1deb15875a8093cff" args="(int maxSteps, double &x1, double &x2, double &stepSize) const " --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">void QwtLinearScaleEngine::autoScale </td> <td>(</td> <td class="paramtype">int </td> <td class="paramname"> <em>maxNumSteps</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">double & </td> <td class="paramname"> <em>x1</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">double & </td> <td class="paramname"> <em>x2</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">double & </td> <td class="paramname"> <em>stepSize</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td> const<code> [virtual]</code></td> </tr> </table> </div> <div class="memdoc"> <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 class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#cf02a88f6e778edbc9e005960f35b3b7">setAttribute()</a> </dd></dl> <p>Implements <a class="el" href="class_qwt_scale_engine.html#a27323d6d9d5348bd253a61b45e4785b">QwtScaleEngine</a>.</p> </div> </div><p> <a class="anchor" name="afed94c688e67c95a6ecf18e8bb522ab"></a><!-- doxytag: member="QwtLinearScaleEngine::divideScale" ref="afed94c688e67c95a6ecf18e8bb522ab" args="(double x1, double x2, int numMajorSteps, int numMinorSteps, double stepSize=0.0) const " --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="class_qwt_scale_div.html">QwtScaleDiv</a> QwtLinearScaleEngine::divideScale </td> <td>(</td> <td class="paramtype">double </td> <td class="paramname"> <em>x1</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">double </td> <td class="paramname"> <em>x2</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </td> <td class="paramname"> <em>maxMajSteps</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </td> <td class="paramname"> <em>maxMinSteps</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">double </td> <td class="paramname"> <em>stepSize</em> = <code>0.0</code></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td> const<code> [virtual]</code></td> </tr> </table> </div> <div class="memdoc"> <p> Calculate a scale division. <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>x1</em> </td><td>First interval limit </td></tr> <tr><td valign="top"></td><td valign="top"><em>x2</em> </td><td>Second interval limit </td></tr> <tr><td valign="top"></td><td valign="top"><em>maxMajSteps</em> </td><td>Maximum for the number of major steps </td></tr> <tr><td valign="top"></td><td valign="top"><em>maxMinSteps</em> </td><td>Maximum number of minor steps </td></tr> <tr><td valign="top"></td><td valign="top"><em>stepSize</em> </td><td>Step size. If stepSize == 0, the scaleEngine calculates one.</td></tr> </table> </dl> <dl class="see" compact><dt><b>See also:</b></dt><dd>QwtScaleEngine::stepSize(), QwtScaleEngine::subDivide() </dd></dl> <p>Implements <a class="el" href="class_qwt_scale_engine.html#833fbdad4cce6e3b6448ee2549dc09e1">QwtScaleEngine</a>.</p> </div> </div><p> <a class="anchor" name="db24f92fa0e8c0548a38cd310158b3d3"></a><!-- doxytag: member="QwtLinearScaleEngine::transformation" ref="db24f92fa0e8c0548a38cd310158b3d3" args="() const " --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="class_qwt_scale_transformation.html">QwtScaleTransformation</a> * QwtLinearScaleEngine::transformation </td> <td>(</td> <td class="paramname"> </td> <td> ) </td> <td> const<code> [virtual]</code></td> </tr> </table> </div> <div class="memdoc"> <p> Return a transformation, for linear scales <p>Implements <a class="el" href="class_qwt_scale_engine.html#04a93d0dc39a3483957764e7749989fd">QwtScaleEngine</a>.</p> </div> </div><p> </div> <hr size="1"><address style="text-align: right;"><small>Generated on Sun Mar 22 16:41:21 2009 for Qwt User's Guide by <a href="http://www.doxygen.org/index.html"> <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.8 </small></address> </body> </html>