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<?xml version="1.0" encoding="UTF-8"?>
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<!-- qlogvalueaxis.cpp -->
  <title>QLogValueAxis Class | Qt Charts 5.9</title>
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<td >Qt 5.9</td><td ><a href="qtcharts-index.html">Qt Charts</a></td><td ><a href="qt-charts-module.html">C++ Classes</a></td><td >QLogValueAxis</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.5 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#reimplemented-public-functions">Reimplemented Public Functions</a></li>
<li class="level1"><a href="#signals">Signals</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QLogValueAxis Class</h1>
<!-- $$$QLogValueAxis-brief -->
<p>The <a href="qlogvalueaxis.html">QLogValueAxis</a> class adds a logarithmic scale to a chart's axis. <a href="#details">More...</a></p>
<!-- @@@QLogValueAxis -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign">   <span class="preprocessor">#include &lt;QLogValueAxis&gt;</span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Instantiated By:</td><td class="memItemRight bottomAlign"> <a href="qml-qtcharts-logvalueaxis.html">LogValueAxis</a></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qabstractaxis.html">QAbstractAxis</a></td></tr></table></div><ul>
<li><a href="qlogvalueaxis-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">Properties</h2>
<div class="table"><table class="propsummary">
<tr><td class="topAlign"><ul>
<li class="fn"><b><a href="qlogvalueaxis.html#base-prop">base</a></b> : qreal</li>
<li class="fn"><b><a href="qlogvalueaxis.html#labelFormat-prop">labelFormat</a></b> : QString</li>
<li class="fn"><b><a href="qlogvalueaxis.html#max-prop">max</a></b> : qreal</li>
</ul></td><td class="topAlign"><ul>
<li class="fn"><b><a href="qlogvalueaxis.html#min-prop">min</a></b> : qreal</li>
<li class="fn"><b><a href="qlogvalueaxis.html#minorTickCount-prop">minorTickCount</a></b> : int</li>
<li class="fn"><b><a href="qlogvalueaxis.html#tickCount-prop">tickCount</a></b> : const int</li>
</ul>
</td></tr>
</table></div>
<ul>
<li class="fn">27 properties inherited from <a href="qabstractaxis.html#properties">QAbstractAxis</a></li>
</ul>
<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#QLogValueAxis">QLogValueAxis</a></b>(QObject *<i>parent</i> = Q_NULLPTR)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#dtor.QLogValueAxis">~QLogValueAxis</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#base-prop">base</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#labelFormat-prop">labelFormat</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#max-prop">max</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#min-prop">min</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#minorTickCount-prop">minorTickCount</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#base-prop">setBase</a></b>(qreal <i>base</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#labelFormat-prop">setLabelFormat</a></b>(const QString &amp;<i>format</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#max-prop">setMax</a></b>(qreal <i>max</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#min-prop">setMin</a></b>(qreal <i>min</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#minorTickCount-prop">setMinorTickCount</a></b>(int <i>minorTickCount</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#setRange">setRange</a></b>(qreal <i>min</i>, qreal <i>max</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#tickCount-prop">tickCount</a></b>() const</td></tr>
</table></div>
<a name="reimplemented-public-functions"></a>
<h2 id="reimplemented-public-functions">Reimplemented Public Functions</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual AxisType </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#type">type</a></b>() const</td></tr>
</table></div>
<ul>
<li class="fn">58 public functions inherited from <a href="qabstractaxis.html#public-functions">QAbstractAxis</a></li>
</ul>
<a name="signals"></a>
<h2 id="signals">Signals</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#baseChanged">baseChanged</a></b>(qreal <i>base</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#labelFormatChanged">labelFormatChanged</a></b>(const QString &amp;<i>format</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#maxChanged">maxChanged</a></b>(qreal <i>max</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#minChanged">minChanged</a></b>(qreal <i>min</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#minorTickCountChanged">minorTickCountChanged</a></b>(int <i>minorTickCount</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#rangeChanged">rangeChanged</a></b>(qreal <i>min</i>, qreal <i>max</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qlogvalueaxis.html#tickCountChanged">tickCountChanged</a></b>(int <i>tickCount</i>)</td></tr>
</table></div>
<ul>
<li class="fn">25 signals inherited from <a href="qabstractaxis.html#signals">QAbstractAxis</a></li>
</ul>
<a name="details"></a>
<!-- $$$QLogValueAxis-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qlogvalueaxis.html">QLogValueAxis</a> class adds a logarithmic scale to a chart's axis.</p>
<p>A logarithmic scale is a nonlinear scale that is based on orders of magnitude, so that each tick mark on the axis is the previous tick mark multiplied by a value.</p>
<p><b>Note: </b>If <a href="qlogvalueaxis.html">QLogValueAxis</a> is attached to a series with one or more points with negative or zero values on the associated dimension, the series will not be plotted at all. This is particularly relevant when XYModelMappers are used, since empty cells in models typically contain zero values.</p></div>
<!-- @@@QLogValueAxis -->
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$base-prop$$$base$$$setBaseqreal$$$baseChangedqreal -->
<h3 class="fn" id="base-prop"><a name="base-prop"></a><span class="name">base</span> : <span class="type">qreal</span></h3>
<p>This property holds the base of the logarithm.</p>
<p>The value has to be greater than 0 and cannot equal 1.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> qreal </td><td class="memItemRight bottomAlign"><span class="name"><b>base</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setBase</b></span>(qreal <i>base</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qlogvalueaxis.html#baseChanged">baseChanged</a></b></span>(qreal <i>base</i>)</td></tr>
</table></div>
<!-- @@@base -->
<!-- $$$labelFormat-prop$$$labelFormat$$$setLabelFormatconstQString&$$$labelFormatChangedconstQString& -->
<h3 class="fn" id="labelFormat-prop"><a name="labelFormat-prop"></a><span class="name">labelFormat</span> : <span class="type">QString</span></h3>
<p>This property holds the label format of the axis.</p>
<p>The format string supports the following conversion specifiers, length modifiers, and flags provided by <code>printf()</code> in the standard C++ library: d, i, o, x, X, f, F, e, E, g, G, c.</p>
<p>If <a href="qchart.html#localizeNumbers-prop">QChart::localizeNumbers</a> is <code>true</code>, the supported specifiers are limited to: d, e, E, f, g, G, and i. Also, only the precision modifier is supported. The rest of the formatting comes from the default QLocale of the application.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> QString </td><td class="memItemRight bottomAlign"><span class="name"><b>labelFormat</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setLabelFormat</b></span>(const QString &amp;<i>format</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qlogvalueaxis.html#labelFormatChanged">labelFormatChanged</a></b></span>(const QString &amp;<i>format</i>)</td></tr>
</table></div>
<p><b>See also </b>QString::asprintf().</p>
<!-- @@@labelFormat -->
<!-- $$$max-prop$$$max$$$setMaxqreal$$$maxChangedqreal -->
<h3 class="fn" id="max-prop"><a name="max-prop"></a><span class="name">max</span> : <span class="type">qreal</span></h3>
<p>This property holds the maximum value on the axis.</p>
<p>When setting this property, the minimum value is adjusted if necessary, to ensure that the range remains valid. The value has to be greater than 0.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> qreal </td><td class="memItemRight bottomAlign"><span class="name"><b>max</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setMax</b></span>(qreal <i>max</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qlogvalueaxis.html#maxChanged">maxChanged</a></b></span>(qreal <i>max</i>)</td></tr>
</table></div>
<!-- @@@max -->
<!-- $$$min-prop$$$min$$$setMinqreal$$$minChangedqreal -->
<h3 class="fn" id="min-prop"><a name="min-prop"></a><span class="name">min</span> : <span class="type">qreal</span></h3>
<p>This property holds the minimum value on the axis.</p>
<p>When setting this property, the maximum value is adjusted if necessary, to ensure that the range remains valid. The value has to be greater than 0.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> qreal </td><td class="memItemRight bottomAlign"><span class="name"><b>min</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setMin</b></span>(qreal <i>min</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qlogvalueaxis.html#minChanged">minChanged</a></b></span>(qreal <i>min</i>)</td></tr>
</table></div>
<!-- @@@min -->
<!-- $$$minorTickCount-prop$$$minorTickCount$$$setMinorTickCountint$$$minorTickCountChangedint -->
<h3 class="fn" id="minorTickCount-prop"><a name="minorTickCount-prop"></a><span class="name">minorTickCount</span> : <span class="type">int</span></h3>
<p>This property holds the number of minor tick marks on the axis. This indicates how many grid lines are drawn between major ticks on the chart. Labels are not drawn for minor ticks. The default value is 0. Set the value to -1 and the number of grid lines between major ticks will be calculated automatically.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> int </td><td class="memItemRight bottomAlign"><span class="name"><b>minorTickCount</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setMinorTickCount</b></span>(int <i>minorTickCount</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qlogvalueaxis.html#minorTickCountChanged">minorTickCountChanged</a></b></span>(int <i>minorTickCount</i>)</td></tr>
</table></div>
<!-- @@@minorTickCount -->
<!-- $$$tickCount-prop$$$tickCount$$$tickCountChangedint -->
<h3 class="fn" id="tickCount-prop"><a name="tickCount-prop"></a><span class="name">tickCount</span> : const <span class="type">int</span></h3>
<p>This property holds the number of tick marks on the axis. This indicates how many grid lines are drawn on the chart. This value is read-only.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> int </td><td class="memItemRight bottomAlign"><span class="name"><b>tickCount</b></span>() const</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qlogvalueaxis.html#tickCountChanged">tickCountChanged</a></b></span>(int <i>tickCount</i>)</td></tr>
</table></div>
<!-- @@@tickCount -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QLogValueAxis[overload1]$$$QLogValueAxisQObject* -->
<h3 class="fn" id="QLogValueAxis"><a name="QLogValueAxis"></a>QLogValueAxis::<span class="name">QLogValueAxis</span>(<span class="type">QObject</span> *<i>parent</i> = Q_NULLPTR)</h3>
<p>Constructs an axis object that is a child of <i>parent</i>.</p>
<!-- @@@QLogValueAxis -->
<!-- $$$~QLogValueAxis[overload1]$$$~QLogValueAxis -->
<h3 class="fn" id="dtor.QLogValueAxis"><a name="dtor.QLogValueAxis"></a>QLogValueAxis::<span class="name">~QLogValueAxis</span>()</h3>
<p>Destroys the object.</p>
<!-- @@@~QLogValueAxis -->
<!-- $$$baseChanged -->
<h3 class="fn" id="baseChanged"><a name="baseChanged"></a><code>[signal] </code><span class="type">void</span> QLogValueAxis::<span class="name">baseChanged</span>(<span class="type">qreal</span> <i>base</i>)</h3>
<p>This signal is emitted when the <i>base</i> of the logarithm of the axis changes.</p>
<p><b>Note:</b> Notifier signal for property <a href="qlogvalueaxis.html#base-prop">base</a>. </p><!-- @@@baseChanged -->
<!-- $$$labelFormatChanged -->
<h3 class="fn" id="labelFormatChanged"><a name="labelFormatChanged"></a><code>[signal] </code><span class="type">void</span> QLogValueAxis::<span class="name">labelFormatChanged</span>(const <span class="type">QString</span> &amp;<i>format</i>)</h3>
<p>This signal is emitted when the <i>format</i> of axis labels changes.</p>
<p><b>Note:</b> Notifier signal for property <a href="qlogvalueaxis.html#labelFormat-prop">labelFormat</a>. </p><!-- @@@labelFormatChanged -->
<!-- $$$maxChanged -->
<h3 class="fn" id="maxChanged"><a name="maxChanged"></a><code>[signal] </code><span class="type">void</span> QLogValueAxis::<span class="name">maxChanged</span>(<span class="type">qreal</span> <i>max</i>)</h3>
<p>This signal is emitted when the maximum value of the axis, specified by <i>max</i>, changes.</p>
<p><b>Note:</b> Notifier signal for property <a href="qlogvalueaxis.html#max-prop">max</a>. </p><!-- @@@maxChanged -->
<!-- $$$minChanged -->
<h3 class="fn" id="minChanged"><a name="minChanged"></a><code>[signal] </code><span class="type">void</span> QLogValueAxis::<span class="name">minChanged</span>(<span class="type">qreal</span> <i>min</i>)</h3>
<p>This signal is emitted when the minimum value of the axis, specified by <i>min</i>, changes.</p>
<p><b>Note:</b> Notifier signal for property <a href="qlogvalueaxis.html#min-prop">min</a>. </p><!-- @@@minChanged -->
<!-- $$$minorTickCountChanged -->
<h3 class="fn" id="minorTickCountChanged"><a name="minorTickCountChanged"></a><code>[signal] </code><span class="type">void</span> QLogValueAxis::<span class="name">minorTickCountChanged</span>(<span class="type">int</span> <i>minorTickCount</i>)</h3>
<p>This signal is emitted when the number of minor tick marks on the axis, specified by <i>minorTickCount</i>, changes.</p>
<p><b>Note:</b> Notifier signal for property <a href="qlogvalueaxis.html#minorTickCount-prop">minorTickCount</a>. </p><!-- @@@minorTickCountChanged -->
<!-- $$$rangeChanged[overload1]$$$rangeChangedqrealqreal -->
<h3 class="fn" id="rangeChanged"><a name="rangeChanged"></a><code>[signal] </code><span class="type">void</span> QLogValueAxis::<span class="name">rangeChanged</span>(<span class="type">qreal</span> <i>min</i>, <span class="type">qreal</span> <i>max</i>)</h3>
<p>This signal is emitted when the minimum or maximum value of the axis, specified by <i>min</i> and <i>max</i>, changes.</p>
<!-- @@@rangeChanged -->
<!-- $$$setRange[overload1]$$$setRangeqrealqreal -->
<h3 class="fn" id="setRange"><a name="setRange"></a><span class="type">void</span> QLogValueAxis::<span class="name">setRange</span>(<span class="type">qreal</span> <i>min</i>, <span class="type">qreal</span> <i>max</i>)</h3>
<p>Sets the range from <i>min</i> to <i>max</i> on the axis. If <i>min</i> is greater than <i>max</i>, this function returns without making any changes.</p>
<!-- @@@setRange -->
<!-- $$$tickCountChanged -->
<h3 class="fn" id="tickCountChanged"><a name="tickCountChanged"></a><code>[signal] </code><span class="type">void</span> QLogValueAxis::<span class="name">tickCountChanged</span>(<span class="type">int</span> <i>tickCount</i>)</h3>
<p>This signal is emitted when the number of tick marks on the axis, specified by <i>tickCount</i>, changes.</p>
<p><b>Note:</b> Notifier signal for property <a href="qlogvalueaxis.html#tickCount-prop">tickCount</a>. </p><!-- @@@tickCountChanged -->
<!-- $$$type[overload1]$$$type -->
<h3 class="fn" id="type"><a name="type"></a><code>[virtual] </code><span class="type"><a href="qabstractaxis.html#AxisType-enum">AxisType</a></span> QLogValueAxis::<span class="name">type</span>() const</h3>
<p>Reimplemented from <a href="qabstractaxis.html#type">QAbstractAxis::type</a>().</p>
<p>Returns the type of the axis.</p>
<!-- @@@type -->
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