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<h1>QwtScaleEngine Class Reference</h1><!-- doxytag: class="QwtScaleEngine" -->Base class for scale engines.
<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 QwtScaleEngine:</div>
<div class="dynsection">
<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 shape="rect" href="class_qwt_linear_scale_engine.html" title="A scale engine for linear scales." alt="" coords="7,83,164,107"><area shape="rect" href="class_qwt_log10_scale_engine.html" title="A scale engine for logarithmic (base 10) scales." alt="" coords="188,83,345,107"></map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div>
<p>
<a href="class_qwt_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 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#ed2ab1fc105a25fa97bbecf4b2f541a7">setMargins</a> (double lower, double upper)</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#0cbcd5c35a8796baf8307bba19991bab">lowerMargin</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#a3fca2f37156fa3bd8ef21be8d339938">upperMargin</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><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 <a class="el" href="class_qwt_scale_engine.html#cf02a88f6e778edbc9e005960f35b3b7">setAttribute()</a>.<p>
Qwt offers implementations for logarithmic (log10) and linear scales. Contributions for other types of scale engines (date/time, log2 ... ) are welcome. <hr><h2>Member Enumeration Documentation</h2>
<a class="anchor" name="7548418e0896d75eec164bfa2ba3ff5f"></a><!-- doxytag: member="QwtScaleEngine::Attribute" ref="7548418e0896d75eec164bfa2ba3ff5f" args="" -->
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<td class="memname">enum <a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">QwtScaleEngine::Attribute</a> </td>
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<p>
<ul>
<li>IncludeReference<br>
Build a scale which includes the <a class="el" href="class_qwt_scale_engine.html#5962458870865df797e84e3bd6badf02">reference()</a> value.</li><li>Symmetric<br>
Build a scale which is symmetric to the <a class="el" href="class_qwt_scale_engine.html#5962458870865df797e84e3bd6badf02">reference()</a> value.</li><li>Floating<br>
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#ed2ab1fc105a25fa97bbecf4b2f541a7" 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.</li><li>Inverted<br>
Turn the scale upside down.</li></ul>
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#cf02a88f6e778edbc9e005960f35b3b7">setAttribute()</a>, <a class="el" href="class_qwt_scale_engine.html#b43cac5ff8843531bbb02b4401e8fb62">testAttribute()</a>, <a class="el" href="class_qwt_scale_engine.html#5962458870865df797e84e3bd6badf02">reference()</a>, <a class="el" href="class_qwt_scale_engine.html#0cbcd5c35a8796baf8307bba19991bab">lowerMargin()</a>, <a class="el" href="class_qwt_scale_engine.html#a3fca2f37156fa3bd8ef21be8d339938">upperMargin()</a> </dd></dl>
</div>
</div><p>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="58cb9344a913fa798ac7343d55f3f693"></a><!-- doxytag: member="QwtScaleEngine::QwtScaleEngine" ref="58cb9344a913fa798ac7343d55f3f693" args="()" -->
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<td class="memname">QwtScaleEngine::QwtScaleEngine </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [explicit]</code></td>
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<p>
Constructor.
<p>
</div>
</div><p>
<a class="anchor" name="b9c21b4550d44d9a82c1865864cb8943"></a><!-- doxytag: member="QwtScaleEngine::~QwtScaleEngine" ref="b9c21b4550d44d9a82c1865864cb8943" args="()" -->
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<td class="memname">QwtScaleEngine::~QwtScaleEngine </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
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<p>
Destructor.
<p>
</div>
</div><p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="3e8d3101af3dbab7a97b96779118e428"></a><!-- doxytag: member="QwtScaleEngine::attributes" ref="3e8d3101af3dbab7a97b96779118e428" args="() const " -->
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<td class="memname">int QwtScaleEngine::attributes </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const</td>
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<p>
Return the scale attributes <dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>, <a class="el" href="class_qwt_scale_engine.html#d221d715e28e644975c6cbda9cae492e">setAttributes()</a>, <a class="el" href="class_qwt_scale_engine.html#b43cac5ff8843531bbb02b4401e8fb62">testAttribute()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="a27323d6d9d5348bd253a61b45e4785b"></a><!-- doxytag: member="QwtScaleEngine::autoScale" ref="a27323d6d9d5348bd253a61b45e4785b" args="(int maxNumSteps, double &x1, double &x2, double &stepSize) const =0" -->
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<td class="memname">virtual void QwtScaleEngine::autoScale </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"> <em>maxNumSteps</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double & </td>
<td class="paramname"> <em>x1</em>, </td>
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<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><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td> const<code> [pure virtual]</code></td>
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<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>.</p>
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<a class="anchor" name="f06bc397d46b40c69fe5c82b7f2c3267"></a><!-- doxytag: member="QwtScaleEngine::buildInterval" ref="f06bc397d46b40c69fe5c82b7f2c3267" args="(double v) const " -->
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<td class="memname"><a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> QwtScaleEngine::buildInterval </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"> <em>v</em> </td>
<td> ) </td>
<td> const<code> [protected]</code></td>
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<p>
Build an interval for a value.
<p>
In case of v == 0.0 the interval is [-0.5, 0.5], otherwide it is [0.5 * v, 1.5 * v]
</div>
</div><p>
<a class="anchor" name="fb902375924c862f1058f77bb7a7029e"></a><!-- doxytag: member="QwtScaleEngine::contains" ref="fb902375924c862f1058f77bb7a7029e" args="(const QwtDoubleInterval &, 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_double_interval.html">QwtDoubleInterval</a> & </td>
<td class="paramname"> <em>interval</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double </td>
<td class="paramname"> <em>value</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td> const<code> [protected]</code></td>
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<p>
Check if an interval "contains" a value<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>value</em> </td><td>Value</td></tr>
</table>
</dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_arithmetic.html#6c6f982022550fba9ccee034f87461ce" title="Compare 2 values, relative to an interval.">QwtScaleArithmetic::compareEps()</a> </dd></dl>
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<a class="anchor" name="ff30158c5ccfee78f4c3e01c0fb5f4de"></a><!-- doxytag: member="QwtScaleEngine::divideInterval" ref="ff30158c5ccfee78f4c3e01c0fb5f4de" 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>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>numSteps</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td> const<code> [protected]</code></td>
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<p>
Calculate a step size for an interval 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>intervalSize</em> </td><td>Interval size </td></tr>
<tr><td valign="top"></td><td valign="top"><em>numSteps</em> </td><td>Number of steps</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>Step size </dd></dl>
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<a class="anchor" name="833fbdad4cce6e3b6448ee2549dc09e1"></a><!-- doxytag: member="QwtScaleEngine::divideScale" ref="833fbdad4cce6e3b6448ee2549dc09e1" args="(double x1, double x2, int maxMajSteps, int maxMinSteps, double stepSize=0.0) const =0" -->
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<td class="memname">virtual <a class="el" href="class_qwt_scale_div.html">QwtScaleDiv</a> QwtScaleEngine::divideScale </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"> <em>x1</em>, </td>
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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>
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<td class="paramtype">int </td>
<td class="paramname"> <em>maxMajSteps</em>, </td>
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<td class="paramname"> <em>maxMinSteps</em>, </td>
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<td class="paramname"> <em>stepSize</em> = <code>0.0</code></td><td> </td>
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<td></td><td></td><td> const<code> [pure virtual]</code></td>
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<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 == 0.0, the scaleEngine calculates one. </td></tr>
</table>
</dl>
<p>Implemented in <a class="el" href="class_qwt_linear_scale_engine.html#afed94c688e67c95a6ecf18e8bb522ab">QwtLinearScaleEngine</a>, and <a class="el" href="class_qwt_log10_scale_engine.html#e46745d561ce2ac583bb44e94f0fc7d6">QwtLog10ScaleEngine</a>.</p>
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</div><p>
<a class="anchor" name="0cbcd5c35a8796baf8307bba19991bab"></a><!-- doxytag: member="QwtScaleEngine::lowerMargin" ref="0cbcd5c35a8796baf8307bba19991bab" args="() const " -->
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<td class="memname">double QwtScaleEngine::lowerMargin </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const</td>
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<p>
<dl class="return" compact><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" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#ed2ab1fc105a25fa97bbecf4b2f541a7" title="Specify margins at the scale's endpoints.">setMargins()</a> </dd></dl>
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</div><p>
<a class="anchor" name="5962458870865df797e84e3bd6badf02"></a><!-- doxytag: member="QwtScaleEngine::reference" ref="5962458870865df797e84e3bd6badf02" args="() const " -->
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<td class="memname">double QwtScaleEngine::reference </td>
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<td class="paramname"> </td>
<td> ) </td>
<td> const</td>
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<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the reference value </dd></dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#89985ea69dbd858c8b9162ecd2be936e" title="Specify a reference point.">setReference()</a>, <a class="el" href="class_qwt_scale_engine.html#cf02a88f6e778edbc9e005960f35b3b7">setAttribute()</a> </dd></dl>
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</div><p>
<a class="anchor" name="cf02a88f6e778edbc9e005960f35b3b7"></a><!-- doxytag: member="QwtScaleEngine::setAttribute" ref="cf02a88f6e778edbc9e005960f35b3b7" 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#7548418e0896d75eec164bfa2ba3ff5f">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><td> </td>
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<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<p>
Change a scale attribute<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>attribute</em> </td><td>Attribute to change </td></tr>
<tr><td valign="top"></td><td valign="top"><em>on</em> </td><td>On/Off</td></tr>
</table>
</dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>, <a class="el" href="class_qwt_scale_engine.html#b43cac5ff8843531bbb02b4401e8fb62">testAttribute()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="d221d715e28e644975c6cbda9cae492e"></a><!-- doxytag: member="QwtScaleEngine::setAttributes" ref="d221d715e28e644975c6cbda9cae492e" args="(int)" -->
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<td class="memname">void QwtScaleEngine::setAttributes </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"> <em>attributes</em> </td>
<td> ) </td>
<td></td>
</tr>
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<div class="memdoc">
<p>
Change the scale attribute<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>attributes</em> </td><td>Set scale attributes </td></tr>
</table>
</dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>, <a class="el" href="class_qwt_scale_engine.html#3e8d3101af3dbab7a97b96779118e428">attributes()</a> </dd></dl>
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</div><p>
<a class="anchor" name="ed2ab1fc105a25fa97bbecf4b2f541a7"></a><!-- doxytag: member="QwtScaleEngine::setMargins" ref="ed2ab1fc105a25fa97bbecf4b2f541a7" 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><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<p>
Specify margins at the scale's endpoints.
<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>lower</em> </td><td>minimum distance between the scale's lower boundary and the smallest enclosed value </td></tr>
<tr><td valign="top"></td><td valign="top"><em>upper</em> </td><td>minimum distance between the scale's upper boundary and the greatest enclosed value</td></tr>
</table>
</dl>
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" compact><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" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#a3fca2f37156fa3bd8ef21be8d339938">upperMargin()</a>, <a class="el" href="class_qwt_scale_engine.html#0cbcd5c35a8796baf8307bba19991bab">lowerMargin()</a> </dd></dl>
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</div><p>
<a class="anchor" name="89985ea69dbd858c8b9162ecd2be936e"></a><!-- doxytag: member="QwtScaleEngine::setReference" ref="89985ea69dbd858c8b9162ecd2be936e" 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></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Specify a reference point.
<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>r</em> </td><td>new reference value</td></tr>
</table>
</dl>
The reference point is needed if options IncludeReference or Symmetric are active. Its default value is 0.0.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="f4522cd83e7885f19d35579d42fbc1fc"></a><!-- doxytag: member="QwtScaleEngine::strip" ref="f4522cd83e7885f19d35579d42fbc1fc" args="(const QwtValueList &, const QwtDoubleInterval &) const " -->
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<td class="memname">QwtValueList QwtScaleEngine::strip </td>
<td>(</td>
<td class="paramtype">const QwtValueList & </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_double_interval.html">QwtDoubleInterval</a> & </td>
<td class="paramname"> <em>interval</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td> const<code> [protected]</code></td>
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<p>
Remove ticks from a list, that are not inside 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>ticks</em> </td><td>Tick list </td></tr>
<tr><td valign="top"></td><td valign="top"><em>interval</em> </td><td>Interval</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>Stripped tick list </dd></dl>
</div>
</div><p>
<a class="anchor" name="b43cac5ff8843531bbb02b4401e8fb62"></a><!-- doxytag: member="QwtScaleEngine::testAttribute" ref="b43cac5ff8843531bbb02b4401e8fb62" 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#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a> </td>
<td class="paramname"> <em>attribute</em> </td>
<td> ) </td>
<td> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Check if a attribute is set.<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>attribute</em> </td><td>Attribute to be tested </td></tr>
</table>
</dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>, <a class="el" href="class_qwt_scale_engine.html#cf02a88f6e778edbc9e005960f35b3b7">setAttribute()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="04a93d0dc39a3483957764e7749989fd"></a><!-- doxytag: member="QwtScaleEngine::transformation" ref="04a93d0dc39a3483957764e7749989fd" args="() const =0" -->
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<td class="memname">virtual <a class="el" href="class_qwt_scale_transformation.html">QwtScaleTransformation</a>* QwtScaleEngine::transformation </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [pure virtual]</code></td>
</tr>
</table>
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<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>a transformation </dd></dl>
<p>Implemented in <a class="el" href="class_qwt_linear_scale_engine.html#db24f92fa0e8c0548a38cd310158b3d3">QwtLinearScaleEngine</a>, and <a class="el" href="class_qwt_log10_scale_engine.html#f972778615ea076c8452abea96516ce9">QwtLog10ScaleEngine</a>.</p>
</div>
</div><p>
<a class="anchor" name="a3fca2f37156fa3bd8ef21be8d339938"></a><!-- doxytag: member="QwtScaleEngine::upperMargin" ref="a3fca2f37156fa3bd8ef21be8d339938" args="() const " -->
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<td class="memname">double QwtScaleEngine::upperMargin </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const</td>
</tr>
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<p>
<dl class="return" compact><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" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#ed2ab1fc105a25fa97bbecf4b2f541a7" title="Specify margins at the scale's endpoints.">setMargins()</a> </dd></dl>
</div>
</div><p>
</div>
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