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<title>Qwt User's Guide: QwtLinearScaleEngine Class Reference</title>
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<div id="projectname">Qwt User's Guide <span id="projectnumber">6.0.1</span></div>
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<h1>QwtLinearScaleEngine Class Reference</h1> </div>
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<!-- doxytag: class="QwtLinearScaleEngine" --><!-- doxytag: inherits="QwtScaleEngine" -->
<p>A scale engine for linear scales.
<a href="#_details">More...</a></p>
<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="dyncontent">
<div class="center"><img src="class_qwt_linear_scale_engine__inherit__graph.png" border="0" usemap="#_qwt_linear_scale_engine_inherit__map" alt="Inheritance graph"/></div>
<map name="_qwt_linear_scale_engine_inherit__map" id="_qwt_linear_scale_engine_inherit__map">
<area shape="rect" id="node2" href="class_qwt_scale_engine.html" title="Base class for scale engines." alt="" coords="23,5,140,35"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<p><a href="class_qwt_linear_scale_engine-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a> { <br/>
  <a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5fa617f0da0b90080be49b79dbaaab191f8">NoAttribute</a> = 0x00,
<br/>
  <a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5fad29dea0ac58c4675ac009620b0857984">IncludeReference</a> = 0x01,
<br/>
  <a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5fab3931d404b68708d0c6eaf87ae744fc9">Symmetric</a> = 0x02,
<br/>
  <a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5fa2158d4b3596e7d4a00375821fc0d20c3">Floating</a> = 0x04,
<br/>
  <a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5fa2f3985208684d394319320b8e67ea062">Inverted</a> = 0x08
<br/>
}</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">typedef QFlags< <a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#a798f5f1420019d33baa799d26bca0255">Attributes</a></td></tr>
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_scale_engine.html#a798f5f1420019d33baa799d26bca0255">Attributes</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#a044961cfa3be3ac86d49610c3881df08">attributes</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_linear_scale_engine.html#ad0f1d825e70eb7a1deb15875a8093cff">autoScale</a> (int maxSteps, double &x1, double &x2, double &stepSize) const </td></tr>
<tr><td class="memItemLeft" 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#aafed94c688e67c95a6ecf18e8bb522ab">divideScale</a> (double x1, double x2, int numMajorSteps, int numMinorSteps, double stepSize=0.0) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#a0cbcd5c35a8796baf8307bba19991bab">lowerMargin</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#a5962458870865df797e84e3bd6badf02">reference</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#acf02a88f6e778edbc9e005960f35b3b7">setAttribute</a> (<a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>, bool on=true)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#acd73d5f27b5db0bc7ee673eb6fe9810d">setAttributes</a> (<a class="el" href="class_qwt_scale_engine.html#a798f5f1420019d33baa799d26bca0255">Attributes</a>)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#aed2ab1fc105a25fa97bbecf4b2f541a7">setMargins</a> (double lower, double upper)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#a89985ea69dbd858c8b9162ecd2be936e">setReference</a> (double reference)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#ab43cac5ff8843531bbb02b4401e8fb62">testAttribute</a> (<a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>) const </td></tr>
<tr><td class="memItemLeft" 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#adb24f92fa0e8c0548a38cd310158b3d3">transformation</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#aa3fca2f37156fa3bd8ef21be8d339938">upperMargin</a> () const </td></tr>
<tr><td colspan="2"><h2><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_interval.html">QwtInterval</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_linear_scale_engine.html#a433918756a04fb25f29ed53f5d20bfd4">align</a> (const <a class="el" href="class_qwt_interval.html">QwtInterval</a> &, double stepSize) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_interval.html">QwtInterval</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#ac9d1a77655b633ee4f165eb5c43a4374">buildInterval</a> (double v) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QList< double > </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_linear_scale_engine.html#a00844c641535d54074f235d1fe3430f5">buildMajorTicks</a> (const <a class="el" href="class_qwt_interval.html">QwtInterval</a> &interval, double stepSize) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_linear_scale_engine.html#a83a6be3d47d0fef14d39138a0130fe40">buildMinorTicks</a> (const QList< double > &majorTicks, int maxMinMark, double step, QList< double > &, QList< double > &) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_linear_scale_engine.html#a7d6a7687ea03a3ce9cde3478f7f21146">buildTicks</a> (const <a class="el" href="class_qwt_interval.html">QwtInterval</a> &, double stepSize, int maxMinSteps, QList< double > ticks[QwtScaleDiv::NTickTypes]) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#a36acba98650d011f784641fa4ac43f87">contains</a> (const <a class="el" href="class_qwt_interval.html">QwtInterval</a> &, double val) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#aff30158c5ccfee78f4c3e01c0fb5f4de">divideInterval</a> (double interval, int numSteps) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QList< double > </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_engine.html#ab2b5b3c6081e1d0007f904dbc3f9f7f1">strip</a> (const QList< double > &, const <a class="el" href="class_qwt_interval.html">QwtInterval</a> &) const </td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>A scale engine for linear scales. </p>
<p>The step size will fit into the pattern <img class="formulaInl" alt="$\left\{ 1,2,5\right\} \cdot 10^{n}$" src="form_4.png"/>, where n is an integer. </p>
</div><hr/><h2>Member Typedef Documentation</h2>
<a class="anchor" id="a798f5f1420019d33baa799d26bca0255"></a><!-- doxytag: member="QwtLinearScaleEngine::Attributes" ref="a798f5f1420019d33baa799d26bca0255" args="" -->
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<td class="memname">typedef QFlags<<a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>> <a class="el" href="class_qwt_scale_engine.html#a798f5f1420019d33baa799d26bca0255">QwtScaleEngine::Attributes</a><code> [inherited]</code></td>
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<div class="memdoc">
<p>Layout attributes. </p>
</div>
</div>
<hr/><h2>Member Enumeration Documentation</h2>
<a class="anchor" id="a7548418e0896d75eec164bfa2ba3ff5f"></a><!-- doxytag: member="QwtLinearScaleEngine::Attribute" ref="a7548418e0896d75eec164bfa2ba3ff5f" args="" -->
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<td class="memname">enum <a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">QwtScaleEngine::Attribute</a><code> [inherited]</code></td>
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</div>
<div class="memdoc">
<p>Layout attributes </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#acf02a88f6e778edbc9e005960f35b3b7">setAttribute()</a>, <a class="el" href="class_qwt_scale_engine.html#ab43cac5ff8843531bbb02b4401e8fb62">testAttribute()</a>, <a class="el" href="class_qwt_scale_engine.html#a5962458870865df797e84e3bd6badf02">reference()</a>, <a class="el" href="class_qwt_scale_engine.html#a0cbcd5c35a8796baf8307bba19991bab">lowerMargin()</a>, <a class="el" href="class_qwt_scale_engine.html#aa3fca2f37156fa3bd8ef21be8d339938">upperMargin()</a> </dd></dl>
<dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" id="a7548418e0896d75eec164bfa2ba3ff5fa617f0da0b90080be49b79dbaaab191f8"></a><!-- doxytag: member="NoAttribute" ref="a7548418e0896d75eec164bfa2ba3ff5fa617f0da0b90080be49b79dbaaab191f8" args="" -->NoAttribute</em> </td><td>
<p>No attributes. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="a7548418e0896d75eec164bfa2ba3ff5fad29dea0ac58c4675ac009620b0857984"></a><!-- doxytag: member="IncludeReference" ref="a7548418e0896d75eec164bfa2ba3ff5fad29dea0ac58c4675ac009620b0857984" args="" -->IncludeReference</em> </td><td>
<p>Build a scale which includes the <a class="el" href="class_qwt_scale_engine.html#a5962458870865df797e84e3bd6badf02">reference()</a> value. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="a7548418e0896d75eec164bfa2ba3ff5fab3931d404b68708d0c6eaf87ae744fc9"></a><!-- doxytag: member="Symmetric" ref="a7548418e0896d75eec164bfa2ba3ff5fab3931d404b68708d0c6eaf87ae744fc9" args="" -->Symmetric</em> </td><td>
<p>Build a scale which is symmetric to the <a class="el" href="class_qwt_scale_engine.html#a5962458870865df797e84e3bd6badf02">reference()</a> value. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="a7548418e0896d75eec164bfa2ba3ff5fa2158d4b3596e7d4a00375821fc0d20c3"></a><!-- doxytag: member="Floating" ref="a7548418e0896d75eec164bfa2ba3ff5fa2158d4b3596e7d4a00375821fc0d20c3" args="" -->Floating</em> </td><td>
<p>The endpoints of the scale are supposed to be equal the outmost included values plus the specified margins (see <a class="el" href="class_qwt_scale_engine.html#aed2ab1fc105a25fa97bbecf4b2f541a7" title="Specify margins at the scale's endpoints.">setMargins()</a>). If this attribute is *not* set, the endpoints of the scale will be integer multiples of the step size. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="a7548418e0896d75eec164bfa2ba3ff5fa2f3985208684d394319320b8e67ea062"></a><!-- doxytag: member="Inverted" ref="a7548418e0896d75eec164bfa2ba3ff5fa2f3985208684d394319320b8e67ea062" args="" -->Inverted</em> </td><td>
<p>Turn the scale upside down. </p>
</td></tr>
</table>
</dd>
</dl>
</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a433918756a04fb25f29ed53f5d20bfd4"></a><!-- doxytag: member="QwtLinearScaleEngine::align" ref="a433918756a04fb25f29ed53f5d20bfd4" args="(const QwtInterval &, double stepSize) const " -->
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<td class="memname"><a class="el" href="class_qwt_interval.html">QwtInterval</a> QwtLinearScaleEngine::align </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="class_qwt_interval.html">QwtInterval</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>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const<code> [protected]</code></td>
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<p>Align an interval to a step size. </p>
<p>The limits of an interval are aligned that both are integer multiples of the step size.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">interval</td><td>Interval </td></tr>
<tr><td class="paramname">stepSize</td><td>Step size</td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>Aligned interval </dd></dl>
</div>
</div>
<a class="anchor" id="a044961cfa3be3ac86d49610c3881df08"></a><!-- doxytag: member="QwtLinearScaleEngine::attributes" ref="a044961cfa3be3ac86d49610c3881df08" args="() const " -->
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<td class="memname"><a class="el" href="class_qwt_scale_engine.html#a798f5f1420019d33baa799d26bca0255">QwtScaleEngine::Attributes</a> QwtScaleEngine::attributes </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const<code> [inherited]</code></td>
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<p>Return the scale attributes </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>, <a class="el" href="class_qwt_scale_engine.html#acd73d5f27b5db0bc7ee673eb6fe9810d">setAttributes()</a>, <a class="el" href="class_qwt_scale_engine.html#ab43cac5ff8843531bbb02b4401e8fb62">testAttribute()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="ad0f1d825e70eb7a1deb15875a8093cff"></a><!-- doxytag: member="QwtLinearScaleEngine::autoScale" ref="ad0f1d825e70eb7a1deb15875a8093cff" args="(int maxSteps, double &x1, double &x2, double &stepSize) const " -->
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<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>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double & </td>
<td class="paramname"><em>x2</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double & </td>
<td class="paramname"><em>stepSize</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const<code> [virtual]</code></td>
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<p>Align and divide an interval</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">maxNumSteps</td><td>Max. number of steps </td></tr>
<tr><td class="paramname">x1</td><td>First limit of the interval (In/Out) </td></tr>
<tr><td class="paramname">x2</td><td>Second limit of the interval (In/Out) </td></tr>
<tr><td class="paramname">stepSize</td><td>Step size (Out)</td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#acf02a88f6e778edbc9e005960f35b3b7">setAttribute()</a> </dd></dl>
<p>Implements <a class="el" href="class_qwt_scale_engine.html#aa27323d6d9d5348bd253a61b45e4785b">QwtScaleEngine</a>.</p>
</div>
</div>
<a class="anchor" id="ac9d1a77655b633ee4f165eb5c43a4374"></a><!-- doxytag: member="QwtLinearScaleEngine::buildInterval" ref="ac9d1a77655b633ee4f165eb5c43a4374" args="(double v) const " -->
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<td class="memname"><a class="el" href="class_qwt_interval.html">QwtInterval</a> QwtScaleEngine::buildInterval </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>v</em></td><td>)</td>
<td> const<code> [protected, inherited]</code></td>
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<div class="memdoc">
<p>Build an interval for a value. </p>
<p>In case of v == 0.0 the interval is [-0.5, 0.5], otherwide it is [0.5 * v, 1.5 * v] </p>
</div>
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<a class="anchor" id="a00844c641535d54074f235d1fe3430f5"></a><!-- doxytag: member="QwtLinearScaleEngine::buildMajorTicks" ref="a00844c641535d54074f235d1fe3430f5" args="(const QwtInterval &interval, double stepSize) const " -->
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<td class="memname">QList< double > QwtLinearScaleEngine::buildMajorTicks </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="class_qwt_interval.html">QwtInterval</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>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const<code> [protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Calculate major ticks for an interval. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">interval</td><td>Interval </td></tr>
<tr><td class="paramname">stepSize</td><td>Step size</td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>Calculated ticks </dd></dl>
</div>
</div>
<a class="anchor" id="a83a6be3d47d0fef14d39138a0130fe40"></a><!-- doxytag: member="QwtLinearScaleEngine::buildMinorTicks" ref="a83a6be3d47d0fef14d39138a0130fe40" args="(const QList< double > &majorTicks, int maxMinMark, double step, QList< double > &, QList< double > &) const " -->
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<td class="memname">void QwtLinearScaleEngine::buildMinorTicks </td>
<td>(</td>
<td class="paramtype">const QList< double > & </td>
<td class="paramname"><em>majorTicks</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>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">QList< double > & </td>
<td class="paramname"><em>minorTicks</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">QList< double > & </td>
<td class="paramname"><em>mediumTicks</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const<code> [protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Calculate minor/medium ticks for major ticks. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">majorTicks</td><td>Major ticks </td></tr>
<tr><td class="paramname">maxMinSteps</td><td>Maximum number of minor steps </td></tr>
<tr><td class="paramname">stepSize</td><td>Step size </td></tr>
<tr><td class="paramname">minorTicks</td><td>Array to be filled with the calculated minor ticks </td></tr>
<tr><td class="paramname">mediumTicks</td><td>Array to be filled with the calculated medium ticks </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a7d6a7687ea03a3ce9cde3478f7f21146"></a><!-- doxytag: member="QwtLinearScaleEngine::buildTicks" ref="a7d6a7687ea03a3ce9cde3478f7f21146" args="(const QwtInterval &, double stepSize, int maxMinSteps, QList< double > ticks[QwtScaleDiv::NTickTypes]) const " -->
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<td class="memname">void QwtLinearScaleEngine::buildTicks </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="class_qwt_interval.html">QwtInterval</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>
</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">QList< double > </td>
<td class="paramname"><em>ticks</em>[QwtScaleDiv::NTickTypes] </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const<code> [protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Calculate ticks for an interval. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">interval</td><td>Interval </td></tr>
<tr><td class="paramname">stepSize</td><td>Step size </td></tr>
<tr><td class="paramname">maxMinSteps</td><td>Maximum number of minor steps </td></tr>
<tr><td class="paramname">ticks</td><td>Arrays to be filled with the calculated ticks</td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_linear_scale_engine.html#a00844c641535d54074f235d1fe3430f5" title="Calculate major ticks for an interval.">buildMajorTicks()</a>, <a class="el" href="class_qwt_linear_scale_engine.html#a83a6be3d47d0fef14d39138a0130fe40" title="Calculate minor/medium ticks for major ticks.">buildMinorTicks</a> </dd></dl>
</div>
</div>
<a class="anchor" id="a36acba98650d011f784641fa4ac43f87"></a><!-- doxytag: member="QwtLinearScaleEngine::contains" ref="a36acba98650d011f784641fa4ac43f87" args="(const QwtInterval &, double val) const " -->
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<td class="memname">bool QwtScaleEngine::contains </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="class_qwt_interval.html">QwtInterval</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>value</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const<code> [protected, inherited]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Check if an interval "contains" a value</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">interval</td><td>Interval </td></tr>
<tr><td class="paramname">value</td><td>Value</td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd>QwtScaleArithmetic::compareEps() </dd></dl>
</div>
</div>
<a class="anchor" id="aff30158c5ccfee78f4c3e01c0fb5f4de"></a><!-- doxytag: member="QwtLinearScaleEngine::divideInterval" ref="aff30158c5ccfee78f4c3e01c0fb5f4de" args="(double interval, int numSteps) const " -->
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<td class="memname">double QwtScaleEngine::divideInterval </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>intervalSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>numSteps</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const<code> [protected, inherited]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Calculate a step size for an interval size</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">intervalSize</td><td>Interval size </td></tr>
<tr><td class="paramname">numSteps</td><td>Number of steps</td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>Step size </dd></dl>
</div>
</div>
<a class="anchor" id="aafed94c688e67c95a6ecf18e8bb522ab"></a><!-- doxytag: member="QwtLinearScaleEngine::divideScale" ref="aafed94c688e67c95a6ecf18e8bb522ab" args="(double x1, double x2, int numMajorSteps, int numMinorSteps, double stepSize=0.0) const " -->
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<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>
</tr>
<tr>
<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><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">x1</td><td>First interval limit </td></tr>
<tr><td class="paramname">x2</td><td>Second interval limit </td></tr>
<tr><td class="paramname">maxMajSteps</td><td>Maximum for the number of major steps </td></tr>
<tr><td class="paramname">maxMinSteps</td><td>Maximum number of minor steps </td></tr>
<tr><td class="paramname">stepSize</td><td>Step size. If stepSize == 0, the scaleEngine calculates one.</td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd>QwtScaleEngine::stepSize(), QwtScaleEngine::subDivide() </dd></dl>
<p>Implements <a class="el" href="class_qwt_scale_engine.html#a833fbdad4cce6e3b6448ee2549dc09e1">QwtScaleEngine</a>.</p>
</div>
</div>
<a class="anchor" id="a0cbcd5c35a8796baf8307bba19991bab"></a><!-- doxytag: member="QwtLinearScaleEngine::lowerMargin" ref="a0cbcd5c35a8796baf8307bba19991bab" args="() const " -->
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<td class="memname">double QwtScaleEngine::lowerMargin </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const<code> [inherited]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl class="return"><dt><b>Returns:</b></dt><dd>the margin at the lower end of the scale The default margin is 0.</dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#aed2ab1fc105a25fa97bbecf4b2f541a7" title="Specify margins at the scale's endpoints.">setMargins()</a> </dd></dl>
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</div>
<a class="anchor" id="a5962458870865df797e84e3bd6badf02"></a><!-- doxytag: member="QwtLinearScaleEngine::reference" ref="a5962458870865df797e84e3bd6badf02" args="() const " -->
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<td class="memname">double QwtScaleEngine::reference </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const<code> [inherited]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl class="return"><dt><b>Returns:</b></dt><dd>the reference value </dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#a89985ea69dbd858c8b9162ecd2be936e" title="Specify a reference point.">setReference()</a>, <a class="el" href="class_qwt_scale_engine.html#acf02a88f6e778edbc9e005960f35b3b7">setAttribute()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="acf02a88f6e778edbc9e005960f35b3b7"></a><!-- doxytag: member="QwtLinearScaleEngine::setAttribute" ref="acf02a88f6e778edbc9e005960f35b3b7" args="(Attribute, bool on=true)" -->
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<td class="memname">void QwtScaleEngine::setAttribute </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a> </td>
<td class="paramname"><em>attribute</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"><em>on</em> = <code>true</code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [inherited]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Change a scale attribute</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">attribute</td><td>Attribute to change </td></tr>
<tr><td class="paramname">on</td><td>On/Off</td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>, <a class="el" href="class_qwt_scale_engine.html#ab43cac5ff8843531bbb02b4401e8fb62">testAttribute()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="acd73d5f27b5db0bc7ee673eb6fe9810d"></a><!-- doxytag: member="QwtLinearScaleEngine::setAttributes" ref="acd73d5f27b5db0bc7ee673eb6fe9810d" args="(Attributes)" -->
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<td class="memname">void QwtScaleEngine::setAttributes </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_qwt_scale_engine.html#a798f5f1420019d33baa799d26bca0255">Attributes</a> </td>
<td class="paramname"><em>attributes</em></td><td>)</td>
<td><code> [inherited]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Change the scale attribute</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">attributes</td><td>Set scale attributes </td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>, <a class="el" href="class_qwt_scale_engine.html#a044961cfa3be3ac86d49610c3881df08">attributes()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="aed2ab1fc105a25fa97bbecf4b2f541a7"></a><!-- doxytag: member="QwtLinearScaleEngine::setMargins" ref="aed2ab1fc105a25fa97bbecf4b2f541a7" args="(double lower, double upper)" -->
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<td class="memname">void QwtScaleEngine::setMargins </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>lower</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>upper</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [inherited]</code></td>
</tr>
</table>
</div>
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<p>Specify margins at the scale's endpoints. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">lower</td><td>minimum distance between the scale's lower boundary and the smallest enclosed value </td></tr>
<tr><td class="paramname">upper</td><td>minimum distance between the scale's upper boundary and the greatest enclosed value</td></tr>
</table>
</dd>
</dl>
<p>Margins can be used to leave a minimum amount of space between the enclosed intervals and the boundaries of the scale.</p>
<dl class="warning"><dt><b>Warning:</b></dt><dd><ul>
<li><a class="el" href="class_qwt_log10_scale_engine.html" title="A scale engine for logarithmic (base 10) scales.">QwtLog10ScaleEngine</a> measures the margins in decades.</li>
</ul>
</dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#aa3fca2f37156fa3bd8ef21be8d339938">upperMargin()</a>, <a class="el" href="class_qwt_scale_engine.html#a0cbcd5c35a8796baf8307bba19991bab">lowerMargin()</a> </dd></dl>
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</div>
<a class="anchor" id="a89985ea69dbd858c8b9162ecd2be936e"></a><!-- doxytag: member="QwtLinearScaleEngine::setReference" ref="a89985ea69dbd858c8b9162ecd2be936e" args="(double reference)" -->
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<td class="memname">void QwtScaleEngine::setReference </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>r</em></td><td>)</td>
<td><code> [inherited]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Specify a reference point. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">r</td><td>new reference value</td></tr>
</table>
</dd>
</dl>
<p>The reference point is needed if options IncludeReference or Symmetric are active. Its default value is 0.0.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a> </dd></dl>
</div>
</div>
<a class="anchor" id="ab2b5b3c6081e1d0007f904dbc3f9f7f1"></a><!-- doxytag: member="QwtLinearScaleEngine::strip" ref="ab2b5b3c6081e1d0007f904dbc3f9f7f1" args="(const QList< double > &, const QwtInterval &) const " -->
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<td class="memname">QList< double > QwtScaleEngine::strip </td>
<td>(</td>
<td class="paramtype">const QList< double > & </td>
<td class="paramname"><em>ticks</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="class_qwt_interval.html">QwtInterval</a> & </td>
<td class="paramname"><em>interval</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const<code> [protected, inherited]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Remove ticks from a list, that are not inside an interval</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">ticks</td><td>Tick list </td></tr>
<tr><td class="paramname">interval</td><td>Interval</td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>Stripped tick list </dd></dl>
</div>
</div>
<a class="anchor" id="ab43cac5ff8843531bbb02b4401e8fb62"></a><!-- doxytag: member="QwtLinearScaleEngine::testAttribute" ref="ab43cac5ff8843531bbb02b4401e8fb62" args="(Attribute) const " -->
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<td class="memname">bool QwtScaleEngine::testAttribute </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a> </td>
<td class="paramname"><em>attribute</em></td><td>)</td>
<td> const<code> [inherited]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Check if a attribute is set.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">attribute</td><td>Attribute to be tested </td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#a7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>, <a class="el" href="class_qwt_scale_engine.html#acf02a88f6e778edbc9e005960f35b3b7">setAttribute()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="adb24f92fa0e8c0548a38cd310158b3d3"></a><!-- doxytag: member="QwtLinearScaleEngine::transformation" ref="adb24f92fa0e8c0548a38cd310158b3d3" args="() const " -->
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<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>
<p>Implements <a class="el" href="class_qwt_scale_engine.html#a04a93d0dc39a3483957764e7749989fd">QwtScaleEngine</a>.</p>
</div>
</div>
<a class="anchor" id="aa3fca2f37156fa3bd8ef21be8d339938"></a><!-- doxytag: member="QwtLinearScaleEngine::upperMargin" ref="aa3fca2f37156fa3bd8ef21be8d339938" args="() const " -->
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<td class="memname">double QwtScaleEngine::upperMargin </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const<code> [inherited]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl class="return"><dt><b>Returns:</b></dt><dd>the margin at the upper end of the scale The default margin is 0.</dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#aed2ab1fc105a25fa97bbecf4b2f541a7" title="Specify margins at the scale's endpoints.">setMargins()</a> </dd></dl>
</div>
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