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<title>Qwt User's Guide: QwtScaleEngine Class Reference</title>
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<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>
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<map name="_qwt_scale_engine__inherit__map">
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<area href="class_qwt_linear_scale_engine.html" shape="rect" coords="7,83,164,107" alt="">
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<area href="class_qwt_log10_scale_engine.html" shape="rect" coords="188,83,345,107" alt="">
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<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>
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Base class for scale engines.
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A scale engine trys to find "reasonable" ranges and step sizes for scales.<p>
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The layout of the scale can be varied with <a class="el" href="class_qwt_scale_engine.html#cf02a88f6e778edbc9e005960f35b3b7">setAttribute()</a>.<p>
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Qwt offers implementations for logarithmic (log10) and linear scales. Contributions for other types of scale engines (date/time, log2 ... ) are welcome.
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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">
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<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
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<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>
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<b>NoAttribute</b> = 0,
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<b>IncludeReference</b> = 1,
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<b>Symmetric</b> = 2,
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<b>Floating</b> = 4,
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<b>Inverted</b> = 8
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<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
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<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>
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<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>
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<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>
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<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#83a925f83808859d02c85fa0d3ae432e">testAttribute</a> (<a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a>) const</td></tr>
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<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>
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<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#b4a6561bd3173d17b5407e93270f1628">attributes</a> () const</td></tr>
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<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>
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<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#041c9485898ea504d9a57ad200438d72">reference</a> () const</td></tr>
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<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>
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<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#bb67c0d07c05c41ad4ad67c3ccaffa1b">loMargin</a> () const</td></tr>
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<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#7ad7e9a499cc399732b0720f545270e0">hiMargin</a> () const</td></tr>
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<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>
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<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#9e788f29baf63184297f55350dd58e30">divideScale</a> (double x1, double x2, int maxMajSteps, int maxMinSteps, double stepSize=0.0) const=0</td></tr>
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<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#8219578551ce5fd1ab8cccd657afdc71">transformation</a> () const=0</td></tr>
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<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
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<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#3fb6cda1c6b66bf5508913655e90d0e0">contains</a> (const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> &, double val) const</td></tr>
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<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#82210ea6ad135a55142578879cb6a8f6">strip</a> (const QwtValueList &, const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> &) const</td></tr>
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<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>
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<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#614c8bc7c24000b0461ed1e63a0d1db8">buildInterval</a> (double v) const</td></tr>
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<hr><h2>Member Enumeration Documentation</h2>
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<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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see <a class="el" href="class_qwt_scale_engine.html#cf02a88f6e778edbc9e005960f35b3b7">QwtScaleEngine::setAttribute</a>, testAttribute
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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>.
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<hr><h2>Constructor & Destructor Documentation</h2>
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<a class="anchor" name="58cb9344a913fa798ac7343d55f3f693"></a><!-- doxytag: member="QwtScaleEngine::QwtScaleEngine" ref="58cb9344a913fa798ac7343d55f3f693" args="()" -->
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<td class="memname">QwtScaleEngine::QwtScaleEngine </td>
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<td class="paramname"> </td>
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<td> ) </td>
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<td width="100%"><code> [explicit]</code></td>
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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>.
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<a class="anchor" name="b9c21b4550d44d9a82c1865864cb8943"></a><!-- doxytag: member="QwtScaleEngine::~QwtScaleEngine" ref="b9c21b4550d44d9a82c1865864cb8943" args="()" -->
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<td class="memname">QwtScaleEngine::~QwtScaleEngine </td>
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<td class="paramname"> </td>
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<td> ) </td>
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<td width="100%"><code> [virtual]</code></td>
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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>.
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<hr><h2>Member Function Documentation</h2>
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<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>
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<td class="paramtype"><a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a> </td>
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<td class="paramname"> <em>attribute</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">bool </td>
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<td class="paramname"> <em>on</em> = <code>true</code></td><td> </td>
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<td></td><td></td><td width="100%"></td>
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Change a scale attribute<p>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>attribute</em> </td><td>Attribute to change </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>on</em> </td><td>On/Off</td></tr>
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The behaviour of the scale engine can be changed with the following attributes: <dl>
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<dt>QwtScaleEngine::IncludeReference </dt>
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<dd>Build a scale which includes the reference value. </dd>
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<dt>QwtScaleEngine::Symmetric </dt>
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<dd>Build a scale which is symmetric to the reference value. </dd>
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<dt>QwtScaleEngine::Floating </dt>
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<dd>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#d6e83875e5e7a65b005ebb6213e1e869">setMargins()</a>). If this attribute is not* set, the endpoints of the scale will be integer multiples of the step size. </dd>
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<dt>QwtScaleEngine::Inverted </dt>
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<dd>Turn the scale upside down. </dd>
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#83a925f83808859d02c85fa0d3ae432e">QwtScaleEngine::testAttribute()</a> </dd></dl>
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00339">339</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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<a class="anchor" name="83a925f83808859d02c85fa0d3ae432e"></a><!-- doxytag: member="QwtScaleEngine::testAttribute" ref="83a925f83808859d02c85fa0d3ae432e" args="(Attribute) const" -->
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<td class="memname">bool QwtScaleEngine::testAttribute </td>
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<td class="paramtype"><a class="el" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a> </td>
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<td class="paramname"> <em>attribute</em> </td>
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<td> ) </td>
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<td width="100%"> const</td>
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Check if a attribute is set.<p>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>attribute</em> </td><td>Attribute to be tested </td></tr>
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#cf02a88f6e778edbc9e005960f35b3b7">QwtScaleEngine::setAttribute()</a> for a description of the possible options. </dd></dl>
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00353">353</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00629">QwtLog10ScaleEngine::autoScale()</a>, and <a class="el" href="qwt__scale__engine_8cpp-source.html#l00416">QwtLinearScaleEngine::autoScale()</a>.
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<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>
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<td class="paramtype">int </td>
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<td class="paramname"> <em>attributes</em> </td>
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<td> ) </td>
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<td width="100%"></td>
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Change the scale attribute<p>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>attributes</em> </td><td>Set scale attributes </td></tr>
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#b4a6561bd3173d17b5407e93270f1628">QwtScaleEngine::attributes()</a> </dd></dl>
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00364">364</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00686">QwtLog10ScaleEngine::divideScale()</a>.
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<td class="memname">int QwtScaleEngine::attributes </td>
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Return the scale attributes
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00372">372</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00686">QwtLog10ScaleEngine::divideScale()</a>.
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<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>
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<td class="paramtype">double </td>
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<td class="paramname"> <em>r</em> </td>
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<td> ) </td>
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Specify a reference point.
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>r</em> </td><td>new reference value</td></tr>
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The reference point is needed if options IncludeRef or Symmetric are active. Its default value is 0.0.
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00384">384</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00686">QwtLog10ScaleEngine::divideScale()</a>.
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<a class="anchor" name="041c9485898ea504d9a57ad200438d72"></a><!-- doxytag: member="QwtScaleEngine::reference" ref="041c9485898ea504d9a57ad200438d72" args="() const" -->
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<td class="memname">double QwtScaleEngine::reference </td>
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<td width="100%"> const</td>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>the reference value </dd></dl>
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#89985ea69dbd858c8b9162ecd2be936e">QwtScaleEngine::setReference()</a>, QwtScaleEngine::setOptions() </dd></dl>
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00393">393</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00629">QwtLog10ScaleEngine::autoScale()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00416">QwtLinearScaleEngine::autoScale()</a>, and <a class="el" href="qwt__scale__engine_8cpp-source.html#l00686">QwtLog10ScaleEngine::divideScale()</a>.
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<a class="anchor" name="d6e83875e5e7a65b005ebb6213e1e869"></a><!-- doxytag: member="QwtScaleEngine::setMargins" ref="d6e83875e5e7a65b005ebb6213e1e869" args="(double m1, double m2)" -->
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<td class="memname">void QwtScaleEngine::setMargins </td>
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<td class="paramtype">double </td>
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<td class="paramname"> <em>mlo</em>, </td>
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<td class="paramtype">double </td>
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<td class="paramname"> <em>mhi</em></td><td> </td>
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<td></td><td></td><td width="100%"></td>
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Specify margins at the scale's endpoints.
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>mlo</em> </td><td>minimum distance between the scale's lower boundary and the smallest enclosed value </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>mhi</em> </td><td>minimum distance between the scale's upper boundary and the greatest enclosed value</td></tr>
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Margins can be used to leave a minimum amount of space between the enclosed intervals and the boundaries of the scale.<p>
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<dl class="warning" compact><dt><b>Warning:</b></dt><dd><ul>
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<li><a class="el" href="class_qwt_log10_scale_engine.html">QwtLog10ScaleEngine</a> measures the margins in decades.</li>
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#7ad7e9a499cc399732b0720f545270e0">QwtScaleEngine::hiMargin</a>, <a class="el" href="class_qwt_scale_engine.html#bb67c0d07c05c41ad4ad67c3ccaffa1b">QwtScaleEngine::loMargin</a> </dd></dl>
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00219">219</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00686">QwtLog10ScaleEngine::divideScale()</a>.
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<td class="memname">double QwtScaleEngine::loMargin </td>
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<td> ) </td>
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<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>
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#d6e83875e5e7a65b005ebb6213e1e869">QwtScaleEngine::setMargins()</a> </dd></dl>
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00187">187</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00629">QwtLog10ScaleEngine::autoScale()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00416">QwtLinearScaleEngine::autoScale()</a>, and <a class="el" href="qwt__scale__engine_8cpp-source.html#l00686">QwtLog10ScaleEngine::divideScale()</a>.
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<a class="anchor" name="7ad7e9a499cc399732b0720f545270e0"></a><!-- doxytag: member="QwtScaleEngine::hiMargin" ref="7ad7e9a499cc399732b0720f545270e0" args="() const" -->
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<div class="memitem">
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<td class="memname">double QwtScaleEngine::hiMargin </td>
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<td class="paramname"> </td>
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<td> ) </td>
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<td width="100%"> const</td>
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<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>
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_engine.html#d6e83875e5e7a65b005ebb6213e1e869">QwtScaleEngine::setMargins()</a> </dd></dl>
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00198">198</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00629">QwtLog10ScaleEngine::autoScale()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00416">QwtLinearScaleEngine::autoScale()</a>, and <a class="el" href="qwt__scale__engine_8cpp-source.html#l00686">QwtLog10ScaleEngine::divideScale()</a>.
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<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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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<td class="memname">virtual void QwtScaleEngine::autoScale </td>
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<td class="paramtype">int </td>
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<td class="paramname"> <em>maxNumSteps</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double & </td>
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<td class="paramname"> <em>x1</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double & </td>
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<td class="paramname"> <em>x2</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double & </td>
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<td class="paramname"> <em>stepSize</em></td><td> </td>
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<td></td><td></td><td width="100%"> const<code> [pure virtual]</code></td>
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Align and divide an interval<p>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>maxNumSteps</em> </td><td>Max. number of steps </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>x1</em> </td><td>First limit of the interval (In/Out) </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>x2</em> </td><td>Second limit of the interval (In/Out) </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>stepSize</em> </td><td>Step size (Return value) </td></tr>
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Implemented in <a class="el" href="class_qwt_linear_scale_engine.html#2b59d0b1b40d476f01b5b693ceac30ed">QwtLinearScaleEngine</a>, and <a class="el" href="class_qwt_log10_scale_engine.html#f725424b579831a058b1d81490a4cec6">QwtLog10ScaleEngine</a>.
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<a class="anchor" name="9e788f29baf63184297f55350dd58e30"></a><!-- doxytag: member="QwtScaleEngine::divideScale" ref="9e788f29baf63184297f55350dd58e30" args="(double x1, double x2, int maxMajSteps, int maxMinSteps, double stepSize=0.0) const=0" -->
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<div class="memitem">
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<table class="memname">
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<td class="memname">virtual <a class="el" href="class_qwt_scale_div.html">QwtScaleDiv</a> QwtScaleEngine::divideScale </td>
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<td class="paramtype">double </td>
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<td class="paramname"> <em>x1</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double </td>
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<td class="paramname"> <em>x2</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int </td>
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<td class="paramname"> <em>maxMajSteps</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int </td>
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<td class="paramname"> <em>maxMinSteps</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double </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 width="100%"> const<code> [pure virtual]</code></td>
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Calculate a scale division.
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>x1</em> </td><td>First interval limit </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>x2</em> </td><td>Second interval limit </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>maxMajSteps</em> </td><td>Maximum for the number of major steps </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>maxMinSteps</em> </td><td>Maximum number of minor steps </td></tr>
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<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>
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Implemented in <a class="el" href="class_qwt_linear_scale_engine.html#9f74287e61d1abfc2096cc88222c132a">QwtLinearScaleEngine</a>, and <a class="el" href="class_qwt_log10_scale_engine.html#302caf0da5f30265827b8d4e9b0cfedb">QwtLog10ScaleEngine</a>.
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<a class="anchor" name="8219578551ce5fd1ab8cccd657afdc71"></a><!-- doxytag: member="QwtScaleEngine::transformation" ref="8219578551ce5fd1ab8cccd657afdc71" args="() const=0" -->
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<div class="memitem">
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<table class="memname">
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<td class="memname">virtual <a class="el" href="class_qwt_scale_transformation.html">QwtScaleTransformation</a>* QwtScaleEngine::transformation </td>
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<td class="paramname"> </td>
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<td> ) </td>
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<td width="100%"> const<code> [pure virtual]</code></td>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>a transformation </dd></dl>
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Implemented in <a class="el" href="class_qwt_linear_scale_engine.html#def184ed0c1febe7611d4f91bb09f5d7">QwtLinearScaleEngine</a>, and <a class="el" href="class_qwt_log10_scale_engine.html#1dd1c14da59c9103a21358971a373e2b">QwtLog10ScaleEngine</a>.
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<a class="anchor" name="3fb6cda1c6b66bf5508913655e90d0e0"></a><!-- doxytag: member="QwtScaleEngine::contains" ref="3fb6cda1c6b66bf5508913655e90d0e0" args="(const QwtDoubleInterval &, double val) const" -->
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<td class="memname">bool QwtScaleEngine::contains </td>
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<td class="paramtype">const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> & </td>
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<td class="paramname"> <em>interval</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">double </td>
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<td class="paramname"> <em>value</em></td><td> </td>
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<td></td><td></td><td width="100%"> const<code> [protected]</code></td>
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Check if an interval "contains" a value<p>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>interval</em> </td><td>Interval </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>value</em> </td><td>Value</td></tr>
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_arithmetic.html#6c6f982022550fba9ccee034f87461ce">QwtScaleArithmetic::compareEps</a> </dd></dl>
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00251">251</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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References <a class="el" href="qwt__scale__engine_8cpp-source.html#l00028">QwtScaleArithmetic::compareEps()</a>, <a class="el" href="qwt__double__interval_8h-source.html#l00200">QwtDoubleInterval::isValid()</a>, <a class="el" href="qwt__double__interval_8h-source.html#l00134">QwtDoubleInterval::maxValue()</a>, <a class="el" href="qwt__double__interval_8h-source.html#l00128">QwtDoubleInterval::minValue()</a>, and <a class="el" href="qwt__double__interval_8h-source.html#l00146">QwtDoubleInterval::width()</a>.
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Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00280">strip()</a>.
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<a class="anchor" name="82210ea6ad135a55142578879cb6a8f6"></a><!-- doxytag: member="QwtScaleEngine::strip" ref="82210ea6ad135a55142578879cb6a8f6" args="(const QwtValueList &, const QwtDoubleInterval &) const" -->
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<td class="memname">QwtValueList QwtScaleEngine::strip </td>
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<td class="paramtype">const QwtValueList & </td>
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<td class="paramname"> <em>ticks</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> & </td>
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<td class="paramname"> <em>interval</em></td><td> </td>
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<td></td><td></td><td width="100%"> const<code> [protected]</code></td>
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Remove ticks from a list, that are not inside an interval<p>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>ticks</em> </td><td>Tick list </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>interval</em> </td><td>Interval</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>Stripped tick list </dd></dl>
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00280">280</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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References <a class="el" href="qwt__scale__engine_8cpp-source.html#l00251">contains()</a>, and <a class="el" href="qwt__double__interval_8h-source.html#l00200">QwtDoubleInterval::isValid()</a>.
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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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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<td class="memname">double QwtScaleEngine::divideInterval </td>
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<td class="paramtype">double </td>
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<td class="paramname"> <em>intervalSize</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int </td>
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<td class="paramname"> <em>numSteps</em></td><td> </td>
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<td></td><td></td><td width="100%"> const<code> [protected]</code></td>
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Calculate a step size for an interval size<p>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>intervalSize</em> </td><td>Interval size </td></tr>
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<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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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00233">233</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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References <a class="el" href="qwt__scale__engine_8cpp-source.html#l00098">QwtScaleArithmetic::ceil125()</a>, and <a class="el" href="qwt__scale__engine_8cpp-source.html#l00084">QwtScaleArithmetic::divideEps()</a>.
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Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00629">QwtLog10ScaleEngine::autoScale()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00416">QwtLinearScaleEngine::autoScale()</a>, <a class="el" href="qwt__scale__engine_8cpp-source.html#l00686">QwtLog10ScaleEngine::divideScale()</a>, and <a class="el" href="qwt__scale__engine_8cpp-source.html#l00461">QwtLinearScaleEngine::divideScale()</a>.
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<a class="anchor" name="614c8bc7c24000b0461ed1e63a0d1db8"></a><!-- doxytag: member="QwtScaleEngine::buildInterval" ref="614c8bc7c24000b0461ed1e63a0d1db8" 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>
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<td class="paramtype">double </td>
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<td class="paramname"> <em>v</em> </td>
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<td> ) </td>
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<td width="100%"> const<code> [protected]</code></td>
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Build an interval for a value.
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In case of v == 0.0 the interval is [-0.5, 0.5], otherwide it is [0.5 * v, 1.5 * v]
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Definition at line <a class="el" href="qwt__scale__engine_8cpp-source.html#l00309">309</a> of file <a class="el" href="qwt__scale__engine_8cpp-source.html">qwt_scale_engine.cpp</a>.
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Referenced by <a class="el" href="qwt__scale__engine_8cpp-source.html#l00629">QwtLog10ScaleEngine::autoScale()</a>, and <a class="el" href="qwt__scale__engine_8cpp-source.html#l00416">QwtLinearScaleEngine::autoScale()</a>.
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<hr size="1"><address style="align: right;"><small>Generated on Sat May 24 18:49:03 2008 for Qwt User's Guide by
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<a href="http://www.doxygen.org/index.html">
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.0 </small></address>
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