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<h1 class="title">donutbreakdownchart.cpp Example File</h1>
<span class="subtitle">donutbreakdown/donutbreakdownchart.cpp</span>
<!-- $$$donutbreakdown/donutbreakdownchart.cpp-description -->
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<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the Qt Charts module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:GPL$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** GNU General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU
  ** General Public License version 3 or (at your option) any later version
  ** approved by the KDE Free Qt Foundation. The licenses are as published by
  ** the Free Software Foundation and appearing in the file LICENSE.GPL3
  ** included in the packaging of this file. Please review the following
  ** information to ensure the GNU General Public License requirements will
  ** be met: https://www.gnu.org/licenses/gpl-3.0.html.
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>
  <span class="preprocessor">#include &quot;donutbreakdownchart.h&quot;</span>
  <span class="preprocessor">#include &quot;mainslice.h&quot;</span>
  <span class="preprocessor">#include &lt;QtCharts/QPieSlice&gt;</span>
  <span class="preprocessor">#include &lt;QtCharts/QPieLegendMarker&gt;</span>

  QT_CHARTS_USE_NAMESPACE

  DonutBreakdownChart<span class="operator">::</span>DonutBreakdownChart(<span class="type">QGraphicsItem</span> <span class="operator">*</span>parent<span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>WindowFlags wFlags)
      : <span class="type"><a href="qchart.html">QChart</a></span>(<span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartTypeCartesian<span class="operator">,</span> parent<span class="operator">,</span> wFlags)
  {
      <span class="comment">// create the series for main center pie</span>
      m_mainSeries <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpieseries.html">QPieSeries</a></span>();
      m_mainSeries<span class="operator">-</span><span class="operator">&gt;</span>setPieSize(<span class="number">0.7</span>);
      <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>addSeries(m_mainSeries);
  }

  <span class="type">void</span> DonutBreakdownChart<span class="operator">::</span>addBreakdownSeries(<span class="type"><a href="qpieseries.html">QPieSeries</a></span> <span class="operator">*</span>breakdownSeries<span class="operator">,</span> <span class="type">QColor</span> color)
  {
      <span class="type">QFont</span> font(<span class="string">&quot;Arial&quot;</span><span class="operator">,</span> <span class="number">8</span>);

      <span class="comment">// add breakdown series as a slice to center pie</span>
      MainSlice <span class="operator">*</span>mainSlice <span class="operator">=</span> <span class="keyword">new</span> MainSlice(breakdownSeries);
      mainSlice<span class="operator">-</span><span class="operator">&gt;</span>setName(breakdownSeries<span class="operator">-</span><span class="operator">&gt;</span>name());
      mainSlice<span class="operator">-</span><span class="operator">&gt;</span>setValue(breakdownSeries<span class="operator">-</span><span class="operator">&gt;</span>sum());
      m_mainSeries<span class="operator">-</span><span class="operator">&gt;</span>append(mainSlice);

      <span class="comment">// customize the slice</span>
      mainSlice<span class="operator">-</span><span class="operator">&gt;</span>setBrush(color);
      mainSlice<span class="operator">-</span><span class="operator">&gt;</span>setLabelVisible();
      mainSlice<span class="operator">-</span><span class="operator">&gt;</span>setLabelColor(<span class="type">Qt</span><span class="operator">::</span>white);
      mainSlice<span class="operator">-</span><span class="operator">&gt;</span>setLabelPosition(<span class="type"><a href="qpieslice.html">QPieSlice</a></span><span class="operator">::</span>LabelInsideHorizontal);
      mainSlice<span class="operator">-</span><span class="operator">&gt;</span>setLabelFont(font);

      <span class="comment">// position and customize the breakdown series</span>
      breakdownSeries<span class="operator">-</span><span class="operator">&gt;</span>setPieSize(<span class="number">0.8</span>);
      breakdownSeries<span class="operator">-</span><span class="operator">&gt;</span>setHoleSize(<span class="number">0.7</span>);
      breakdownSeries<span class="operator">-</span><span class="operator">&gt;</span>setLabelsVisible();
      <span class="keyword">const</span> <span class="keyword">auto</span> slices <span class="operator">=</span> breakdownSeries<span class="operator">-</span><span class="operator">&gt;</span>slices();
      <span class="keyword">for</span> (<span class="type"><a href="qpieslice.html">QPieSlice</a></span> <span class="operator">*</span>slice : slices) {
          color <span class="operator">=</span> color<span class="operator">.</span>lighter(<span class="number">115</span>);
          slice<span class="operator">-</span><span class="operator">&gt;</span>setBrush(color);
          slice<span class="operator">-</span><span class="operator">&gt;</span>setLabelFont(font);
      }

      <span class="comment">// add the series to the chart</span>
      <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>addSeries(breakdownSeries);

      <span class="comment">// recalculate breakdown donut segments</span>
      recalculateAngles();

      <span class="comment">// update customize legend markers</span>
      updateLegendMarkers();
  }

  <span class="type">void</span> DonutBreakdownChart<span class="operator">::</span>recalculateAngles()
  {
      <span class="type">qreal</span> angle <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">const</span> <span class="keyword">auto</span> slices <span class="operator">=</span> m_mainSeries<span class="operator">-</span><span class="operator">&gt;</span>slices();
      <span class="keyword">for</span> (<span class="type"><a href="qpieslice.html">QPieSlice</a></span> <span class="operator">*</span>slice : slices) {
          <span class="type"><a href="qpieseries.html">QPieSeries</a></span> <span class="operator">*</span>breakdownSeries <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>MainSlice <span class="operator">*</span><span class="operator">&gt;</span>(slice)<span class="operator">-</span><span class="operator">&gt;</span>breakdownSeries();
          breakdownSeries<span class="operator">-</span><span class="operator">&gt;</span>setPieStartAngle(angle);
          angle <span class="operator">+</span><span class="operator">=</span> slice<span class="operator">-</span><span class="operator">&gt;</span>percentage() <span class="operator">*</span> <span class="number">360.0</span>; <span class="comment">// full pie is 360.0</span>
          breakdownSeries<span class="operator">-</span><span class="operator">&gt;</span>setPieEndAngle(angle);
      }
  }

  <span class="type">void</span> DonutBreakdownChart<span class="operator">::</span>updateLegendMarkers()
  {
      <span class="comment">// go through all markers</span>
      <span class="keyword">const</span> <span class="keyword">auto</span> allseries <span class="operator">=</span> series();
      <span class="keyword">for</span> (<span class="type"><a href="qabstractseries.html">QAbstractSeries</a></span> <span class="operator">*</span>series : allseries) {
          <span class="keyword">const</span> <span class="keyword">auto</span> markers <span class="operator">=</span> legend()<span class="operator">-</span><span class="operator">&gt;</span>markers(series);
          <span class="keyword">for</span> (<span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span> <span class="operator">*</span>marker : markers) {
              <span class="type"><a href="qpielegendmarker.html">QPieLegendMarker</a></span> <span class="operator">*</span>pieMarker <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span><span class="type"><a href="qpielegendmarker.html">QPieLegendMarker</a></span> <span class="operator">*</span><span class="operator">&gt;</span>(marker);
              <span class="keyword">if</span> (series <span class="operator">=</span><span class="operator">=</span> m_mainSeries) {
                  <span class="comment">// hide markers from main series</span>
                  pieMarker<span class="operator">-</span><span class="operator">&gt;</span>setVisible(<span class="keyword">false</span>);
              } <span class="keyword">else</span> {
                  <span class="comment">// modify markers from breakdown series</span>
                  pieMarker<span class="operator">-</span><span class="operator">&gt;</span>setLabel(<span class="type">QString</span>(<span class="string">&quot;%1 %2%&quot;</span>)
                                      <span class="operator">.</span>arg(pieMarker<span class="operator">-</span><span class="operator">&gt;</span>slice()<span class="operator">-</span><span class="operator">&gt;</span>label())
                                      <span class="operator">.</span>arg(pieMarker<span class="operator">-</span><span class="operator">&gt;</span>slice()<span class="operator">-</span><span class="operator">&gt;</span>percentage() <span class="operator">*</span> <span class="number">100</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="char">'f'</span><span class="operator">,</span> <span class="number">2</span>));
                  pieMarker<span class="operator">-</span><span class="operator">&gt;</span>setFont(<span class="type">QFont</span>(<span class="string">&quot;Arial&quot;</span><span class="operator">,</span> <span class="number">8</span>));
              }
          }
      }
  }

</pre>
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<!-- @@@donutbreakdown/donutbreakdownchart.cpp -->
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