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<?xml version="1.0" encoding="UTF-8"?>
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<!-- qvalueaxis.cpp -->
  <title>QValueAxis 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 >QValueAxis</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="#public-slots">Public Slots</a></li>
<li class="level1"><a href="#signals">Signals</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
</ul>
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<h1 class="title">QValueAxis Class</h1>
<!-- $$$QValueAxis-brief -->
<p>The <a href="qvalueaxis.html">QValueAxis</a> class adds values to a chart's axes. <a href="#details">More...</a></p>
<!-- @@@QValueAxis -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign">   <span class="preprocessor">#include &lt;QValueAxis&gt;</span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Instantiated By:</td><td class="memItemRight bottomAlign"> <a href="qml-qtcharts-valueaxis.html">ValueAxis</a></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qabstractaxis.html">QAbstractAxis</a></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherited By:</td><td class="memItemRight bottomAlign"> <p><a href="qcategoryaxis.html">QCategoryAxis</a></p>
</td></tr></table></div><ul>
<li><a href="qvalueaxis-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="qvalueaxis.html#labelFormat-prop">labelFormat</a></b> : QString</li>
<li class="fn"><b><a href="qvalueaxis.html#max-prop">max</a></b> : qreal</li>
<li class="fn"><b><a href="qvalueaxis.html#min-prop">min</a></b> : qreal</li>
</ul></td><td class="topAlign"><ul>
<li class="fn"><b><a href="qvalueaxis.html#minorTickCount-prop">minorTickCount</a></b> : int</li>
<li class="fn"><b><a href="qvalueaxis.html#tickCount-prop">tickCount</a></b> : 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="qvalueaxis.html#QValueAxis">QValueAxis</a></b>(QObject *<i>parent</i> = Q_NULLPTR)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvalueaxis.html#dtor.QValueAxis">~QValueAxis</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="qvalueaxis.html#labelFormat-prop">labelFormat</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qvalueaxis.html#max-prop">max</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qvalueaxis.html#min-prop">min</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qvalueaxis.html#minorTickCount-prop">minorTickCount</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qvalueaxis.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="qvalueaxis.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="qvalueaxis.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="qvalueaxis.html#minorTickCount-prop">setMinorTickCount</a></b>(int <i>count</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qvalueaxis.html#setRange">setRange</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="qvalueaxis.html#tickCount-prop">setTickCount</a></b>(int <i>count</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qvalueaxis.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="qvalueaxis.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="public-slots"></a>
<h2 id="public-slots">Public Slots</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qvalueaxis.html#applyNiceNumbers">applyNiceNumbers</a></b>()</td></tr>
</table></div>
<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="qvalueaxis.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="qvalueaxis.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="qvalueaxis.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="qvalueaxis.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="qvalueaxis.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="qvalueaxis.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>
<!-- $$$QValueAxis-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qvalueaxis.html">QValueAxis</a> class adds values to a chart's axes.</p>
<p>A value axis can be set up to show an axis line with tick marks, grid lines, and shades. The values on the axis are drawn at the positions of tick marks.</p>
<p>The following example code illustrates how to use the <a href="qvalueaxis.html">QValueAxis</a> class:</p>
<pre class="cpp">

  <span class="type"><a href="qchartview.html">QChartView</a></span> <span class="operator">*</span>chartView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchartview.html">QChartView</a></span>;
  <span class="type"><a href="qlineseries.html">QLineSeries</a></span> <span class="operator">*</span>series <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineseries.html">QLineSeries</a></span>;
  <span class="comment">// ...</span>
  chartView<span class="operator">-</span><span class="operator">&gt;</span>chart()<span class="operator">-</span><span class="operator">&gt;</span>addSeries(series);

  <span class="type"><a href="qvalueaxis.html#QValueAxis">QValueAxis</a></span> <span class="operator">*</span>axisX <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvalueaxis.html#QValueAxis">QValueAxis</a></span>;
  axisX<span class="operator">-</span><span class="operator">&gt;</span>setRange(<span class="number">10</span><span class="operator">,</span> <span class="number">20.5</span>);
  axisX<span class="operator">-</span><span class="operator">&gt;</span>setTickCount(<span class="number">10</span>);
  axisX<span class="operator">-</span><span class="operator">&gt;</span>setLabelFormat(<span class="string">&quot;%.2f&quot;</span>);
  chartView<span class="operator">-</span><span class="operator">&gt;</span>chart()<span class="operator">-</span><span class="operator">&gt;</span>setAxisX(axisX<span class="operator">,</span> series);

</pre>
</div>
<!-- @@@QValueAxis -->
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$labelFormat-prop$$$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="qvalueaxis.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.</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="qvalueaxis.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.</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="qvalueaxis.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.</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>count</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="qvalueaxis.html#minorTickCountChanged">minorTickCountChanged</a></b></span>(int <i>minorTickCount</i>)</td></tr>
</table></div>
<!-- @@@minorTickCount -->
<!-- $$$tickCount-prop$$$tickCount$$$setTickCountint$$$tickCountChangedint -->
<h3 class="fn" id="tickCount-prop"><a name="tickCount-prop"></a><span class="name">tickCount</span> : <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. The default value is 5, and the number cannot be less than 2.</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>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setTickCount</b></span>(int <i>count</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="qvalueaxis.html#tickCountChanged">tickCountChanged</a></b></span>(int <i>tickCount</i>)</td></tr>
</table></div>
<!-- @@@tickCount -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QValueAxis[overload1]$$$QValueAxisQObject* -->
<h3 class="fn" id="QValueAxis"><a name="QValueAxis"></a>QValueAxis::<span class="name">QValueAxis</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>
<!-- @@@QValueAxis -->
<!-- $$$~QValueAxis[overload1]$$$~QValueAxis -->
<h3 class="fn" id="dtor.QValueAxis"><a name="dtor.QValueAxis"></a>QValueAxis::<span class="name">~QValueAxis</span>()</h3>
<p>Destroys the object.</p>
<!-- @@@~QValueAxis -->
<!-- $$$applyNiceNumbers[overload1]$$$applyNiceNumbers -->
<h3 class="fn" id="applyNiceNumbers"><a name="applyNiceNumbers"></a><code>[slot] </code><span class="type">void</span> QValueAxis::<span class="name">applyNiceNumbers</span>()</h3>
<p>Modifies the current range and number of tick marks on the axis to look <i>nice</i>. The algorithm considers numbers that can be expressed as a form of 1*10^n, 2* 10^n, or 5*10^n to be nice numbers. These numbers are used for setting spacing for the tick marks.</p>
<p><b>See also </b><a href="qvalueaxis.html#setRange">setRange</a>() and <a href="qvalueaxis.html#tickCount-prop">setTickCount</a>().</p>
<!-- @@@applyNiceNumbers -->
<!-- $$$labelFormatChanged -->
<h3 class="fn" id="labelFormatChanged"><a name="labelFormatChanged"></a><code>[signal] </code><span class="type">void</span> QValueAxis::<span class="name">labelFormatChanged</span>(const <span class="type">QString</span> &amp;<i>format</i>)</h3>
<p>This signal is emitted when the <i>format</i> of axis labels changes.</p>
<p><b>Note:</b> Notifier signal for property <a href="qvalueaxis.html#labelFormat-prop">labelFormat</a>. </p><!-- @@@labelFormatChanged -->
<!-- $$$maxChanged -->
<h3 class="fn" id="maxChanged"><a name="maxChanged"></a><code>[signal] </code><span class="type">void</span> QValueAxis::<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="qvalueaxis.html#max-prop">max</a>. </p><!-- @@@maxChanged -->
<!-- $$$minChanged -->
<h3 class="fn" id="minChanged"><a name="minChanged"></a><code>[signal] </code><span class="type">void</span> QValueAxis::<span class="name">minChanged</span>(<span class="type">qreal</span> <i>min</i>)</h3>
<p>This signal is emitted when the minimum value of the axis, specified by <i>min</i>, changes.</p>
<p><b>Note:</b> Notifier signal for property <a href="qvalueaxis.html#min-prop">min</a>. </p><!-- @@@minChanged -->
<!-- $$$minorTickCountChanged -->
<h3 class="fn" id="minorTickCountChanged"><a name="minorTickCountChanged"></a><code>[signal] </code><span class="type">void</span> QValueAxis::<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="qvalueaxis.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> QValueAxis::<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> QValueAxis::<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 -->
<!-- $$$tickCountChanged -->
<h3 class="fn" id="tickCountChanged"><a name="tickCountChanged"></a><code>[signal] </code><span class="type">void</span> QValueAxis::<span class="name">tickCountChanged</span>(<span class="type">int</span> <i>tickCount</i>)</h3>
<p>This signal is emitted when the number of tick marks on the axis, specified by <i>tickCount</i>, changes.</p>
<p><b>Note:</b> Notifier signal for property <a href="qvalueaxis.html#tickCount-prop">tickCount</a>. </p><!-- @@@tickCountChanged -->
<!-- $$$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> QValueAxis::<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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