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<td >Qt 5.9</td><td ><a href="qtcharts-index.html">Qt Charts</a></td><td ><a href="qtcharts-piechartcustomization-example.html">Pie Chart Customization Example</a></td><td >mainwidget.cpp Example File</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">mainwidget.cpp Example File</h1>
<span class="subtitle">piechartcustomization/mainwidget.cpp</span>
<!-- $$$piechartcustomization/mainwidget.cpp-description -->
<div class="descr"> <a name="details"></a>
<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;mainwidget.h&quot;</span>
  <span class="preprocessor">#include &quot;customslice.h&quot;</span>
  <span class="preprocessor">#include &quot;pentool.h&quot;</span>
  <span class="preprocessor">#include &quot;brushtool.h&quot;</span>
  <span class="preprocessor">#include &lt;QtWidgets/QPushButton&gt;</span>
  <span class="preprocessor">#include &lt;QtWidgets/QComboBox&gt;</span>
  <span class="preprocessor">#include &lt;QtWidgets/QCheckBox&gt;</span>
  <span class="preprocessor">#include &lt;QtWidgets/QLineEdit&gt;</span>
  <span class="preprocessor">#include &lt;QtWidgets/QGroupBox&gt;</span>
  <span class="preprocessor">#include &lt;QtWidgets/QDoubleSpinBox&gt;</span>
  <span class="preprocessor">#include &lt;QtWidgets/QFormLayout&gt;</span>
  <span class="preprocessor">#include &lt;QtWidgets/QFontDialog&gt;</span>
  <span class="preprocessor">#include &lt;QtCharts/QChartView&gt;</span>
  <span class="preprocessor">#include &lt;QtCharts/QPieSeries&gt;</span>

  QT_CHARTS_USE_NAMESPACE

  MainWidget<span class="operator">::</span>MainWidget(<span class="type">QWidget</span> <span class="operator">*</span>parent)
      : <span class="type">QWidget</span>(parent)<span class="operator">,</span>
        m_slice(<span class="number">0</span>)
  {
      <span class="comment">// create chart</span>
      <span class="type"><a href="qchart.html">QChart</a></span> <span class="operator">*</span>chart <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>;
      chart<span class="operator">-</span><span class="operator">&gt;</span>setTitle(<span class="string">&quot;Piechart customization&quot;</span>);
      chart<span class="operator">-</span><span class="operator">&gt;</span>setAnimationOptions(<span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>AllAnimations);

      <span class="comment">// create series</span>
      m_series <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpieseries.html">QPieSeries</a></span>();
      <span class="operator">*</span>m_series <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="keyword">new</span> CustomSlice(<span class="string">&quot;Slice 1&quot;</span><span class="operator">,</span> <span class="number">10.0</span>);
      <span class="operator">*</span>m_series <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="keyword">new</span> CustomSlice(<span class="string">&quot;Slice 2&quot;</span><span class="operator">,</span> <span class="number">20.0</span>);
      <span class="operator">*</span>m_series <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="keyword">new</span> CustomSlice(<span class="string">&quot;Slice 3&quot;</span><span class="operator">,</span> <span class="number">30.0</span>);
      <span class="operator">*</span>m_series <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="keyword">new</span> CustomSlice(<span class="string">&quot;Slice 4&quot;</span><span class="operator">,</span> <span class="number">40.0</span>);
      <span class="operator">*</span>m_series <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="keyword">new</span> CustomSlice(<span class="string">&quot;Slice 5&quot;</span><span class="operator">,</span> <span class="number">50.0</span>);
      m_series<span class="operator">-</span><span class="operator">&gt;</span>setLabelsVisible();
      chart<span class="operator">-</span><span class="operator">&gt;</span>addSeries(m_series);

      connect(m_series<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qpieseries.html">QPieSeries</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>handleSliceClicked);

      <span class="comment">// chart settings</span>
      m_themeComboBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QComboBox</span>();
      m_themeComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;Light&quot;</span><span class="operator">,</span> <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartThemeLight);
      m_themeComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;BlueCerulean&quot;</span><span class="operator">,</span> <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartThemeBlueCerulean);
      m_themeComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;Dark&quot;</span><span class="operator">,</span> <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartThemeDark);
      m_themeComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;BrownSand&quot;</span><span class="operator">,</span> <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartThemeBrownSand);
      m_themeComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;BlueNcs&quot;</span><span class="operator">,</span> <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartThemeBlueNcs);
      m_themeComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;High Contrast&quot;</span><span class="operator">,</span> <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartThemeHighContrast);
      m_themeComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;Blue Icy&quot;</span><span class="operator">,</span> <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartThemeBlueIcy);
      m_themeComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;Qt&quot;</span><span class="operator">,</span> <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartThemeQt);

      m_aaCheckBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QCheckBox</span>();
      m_animationsCheckBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QCheckBox</span>();
      m_animationsCheckBox<span class="operator">-</span><span class="operator">&gt;</span>setCheckState(<span class="type">Qt</span><span class="operator">::</span>Checked);

      m_legendCheckBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QCheckBox</span>();

      <span class="type">QFormLayout</span> <span class="operator">*</span>chartSettingsLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QFormLayout</span>();
      chartSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Theme&quot;</span><span class="operator">,</span> m_themeComboBox);
      chartSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Antialiasing&quot;</span><span class="operator">,</span> m_aaCheckBox);
      chartSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Animations&quot;</span><span class="operator">,</span> m_animationsCheckBox);
      chartSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Legend&quot;</span><span class="operator">,</span> m_legendCheckBox);
      <span class="type">QGroupBox</span> <span class="operator">*</span>chartSettings <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGroupBox</span>(<span class="string">&quot;Chart&quot;</span>);
      chartSettings<span class="operator">-</span><span class="operator">&gt;</span>setLayout(chartSettingsLayout);

      connect(m_themeComboBox<span class="operator">,</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type">QComboBox</span><span class="operator">::</span><span class="operator">*</span>)(<span class="type">int</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type">QComboBox</span><span class="operator">::</span>currentIndexChanged)<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateChartSettings);
      connect(m_aaCheckBox<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QCheckBox</span><span class="operator">::</span>toggled<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateChartSettings);
      connect(m_animationsCheckBox<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QCheckBox</span><span class="operator">::</span>toggled<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateChartSettings);
      connect(m_legendCheckBox<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QCheckBox</span><span class="operator">::</span>toggled<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateChartSettings);

      <span class="comment">// series settings</span>
      m_hPosition <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QDoubleSpinBox</span>();
      m_hPosition<span class="operator">-</span><span class="operator">&gt;</span>setMinimum(<span class="number">0.0</span>);
      m_hPosition<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(<span class="number">1.0</span>);
      m_hPosition<span class="operator">-</span><span class="operator">&gt;</span>setSingleStep(<span class="number">0.1</span>);
      m_hPosition<span class="operator">-</span><span class="operator">&gt;</span>setValue(m_series<span class="operator">-</span><span class="operator">&gt;</span>horizontalPosition());

      m_vPosition <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QDoubleSpinBox</span>();
      m_vPosition<span class="operator">-</span><span class="operator">&gt;</span>setMinimum(<span class="number">0.0</span>);
      m_vPosition<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(<span class="number">1.0</span>);
      m_vPosition<span class="operator">-</span><span class="operator">&gt;</span>setSingleStep(<span class="number">0.1</span>);
      m_vPosition<span class="operator">-</span><span class="operator">&gt;</span>setValue(m_series<span class="operator">-</span><span class="operator">&gt;</span>verticalPosition());

      m_sizeFactor <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QDoubleSpinBox</span>();
      m_sizeFactor<span class="operator">-</span><span class="operator">&gt;</span>setMinimum(<span class="number">0.0</span>);
      m_sizeFactor<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(<span class="number">1.0</span>);
      m_sizeFactor<span class="operator">-</span><span class="operator">&gt;</span>setSingleStep(<span class="number">0.1</span>);
      m_sizeFactor<span class="operator">-</span><span class="operator">&gt;</span>setValue(m_series<span class="operator">-</span><span class="operator">&gt;</span>pieSize());

      m_startAngle <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QDoubleSpinBox</span>();
      m_startAngle<span class="operator">-</span><span class="operator">&gt;</span>setMinimum(<span class="operator">-</span><span class="number">720</span>);
      m_startAngle<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(<span class="number">720</span>);
      m_startAngle<span class="operator">-</span><span class="operator">&gt;</span>setValue(m_series<span class="operator">-</span><span class="operator">&gt;</span>pieStartAngle());
      m_startAngle<span class="operator">-</span><span class="operator">&gt;</span>setSingleStep(<span class="number">1</span>);

      m_endAngle <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QDoubleSpinBox</span>();
      m_endAngle<span class="operator">-</span><span class="operator">&gt;</span>setMinimum(<span class="operator">-</span><span class="number">720</span>);
      m_endAngle<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(<span class="number">720</span>);
      m_endAngle<span class="operator">-</span><span class="operator">&gt;</span>setValue(m_series<span class="operator">-</span><span class="operator">&gt;</span>pieEndAngle());
      m_endAngle<span class="operator">-</span><span class="operator">&gt;</span>setSingleStep(<span class="number">1</span>);

      m_holeSize <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QDoubleSpinBox</span>();
      m_holeSize<span class="operator">-</span><span class="operator">&gt;</span>setMinimum(<span class="number">0.0</span>);
      m_holeSize<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(<span class="number">1.0</span>);
      m_holeSize<span class="operator">-</span><span class="operator">&gt;</span>setSingleStep(<span class="number">0.1</span>);
      m_holeSize<span class="operator">-</span><span class="operator">&gt;</span>setValue(m_series<span class="operator">-</span><span class="operator">&gt;</span>holeSize());

      <span class="type">QPushButton</span> <span class="operator">*</span>appendSlice <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>(<span class="string">&quot;Append slice&quot;</span>);
      <span class="type">QPushButton</span> <span class="operator">*</span>insertSlice <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>(<span class="string">&quot;Insert slice&quot;</span>);
      <span class="type">QPushButton</span> <span class="operator">*</span>removeSlice <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>(<span class="string">&quot;Remove selected slice&quot;</span>);

      <span class="type">QFormLayout</span> <span class="operator">*</span>seriesSettingsLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QFormLayout</span>();
      seriesSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Horizontal position&quot;</span><span class="operator">,</span> m_hPosition);
      seriesSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Vertical position&quot;</span><span class="operator">,</span> m_vPosition);
      seriesSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Size factor&quot;</span><span class="operator">,</span> m_sizeFactor);
      seriesSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Start angle&quot;</span><span class="operator">,</span> m_startAngle);
      seriesSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;End angle&quot;</span><span class="operator">,</span> m_endAngle);
      seriesSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Hole size&quot;</span><span class="operator">,</span> m_holeSize);
      seriesSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(appendSlice);
      seriesSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(insertSlice);
      seriesSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(removeSlice);
      <span class="type">QGroupBox</span> <span class="operator">*</span>seriesSettings <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGroupBox</span>(<span class="string">&quot;Series&quot;</span>);
      seriesSettings<span class="operator">-</span><span class="operator">&gt;</span>setLayout(seriesSettingsLayout);

      connect(m_vPosition<span class="operator">,</span>
              <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type">QDoubleSpinBox</span><span class="operator">::</span><span class="operator">*</span>)(<span class="type">double</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type">QDoubleSpinBox</span><span class="operator">::</span>valueChanged)<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSerieSettings);
      connect(m_hPosition<span class="operator">,</span>
              <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type">QDoubleSpinBox</span><span class="operator">::</span><span class="operator">*</span>)(<span class="type">double</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type">QDoubleSpinBox</span><span class="operator">::</span>valueChanged)<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSerieSettings);
      connect(m_sizeFactor<span class="operator">,</span>
              <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type">QDoubleSpinBox</span><span class="operator">::</span><span class="operator">*</span>)(<span class="type">double</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type">QDoubleSpinBox</span><span class="operator">::</span>valueChanged)<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSerieSettings);
      connect(m_startAngle<span class="operator">,</span>
              <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type">QDoubleSpinBox</span><span class="operator">::</span><span class="operator">*</span>)(<span class="type">double</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type">QDoubleSpinBox</span><span class="operator">::</span>valueChanged)<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSerieSettings);
      connect(m_endAngle<span class="operator">,</span>
              <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type">QDoubleSpinBox</span><span class="operator">::</span><span class="operator">*</span>)(<span class="type">double</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type">QDoubleSpinBox</span><span class="operator">::</span>valueChanged)<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSerieSettings);
      connect(m_holeSize<span class="operator">,</span>
              <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type">QDoubleSpinBox</span><span class="operator">::</span><span class="operator">*</span>)(<span class="type">double</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type">QDoubleSpinBox</span><span class="operator">::</span>valueChanged)<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSerieSettings);
      connect(appendSlice<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QPushButton</span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>appendSlice);
      connect(insertSlice<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QPushButton</span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>insertSlice);
      connect(removeSlice<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QPushButton</span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>removeSlice);

      <span class="comment">// slice settings</span>
      m_sliceName <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLineEdit</span>(<span class="string">&quot;&lt;click a slice&gt;&quot;</span>);
      m_sliceName<span class="operator">-</span><span class="operator">&gt;</span>setSizePolicy(<span class="type">QSizePolicy</span><span class="operator">::</span>Maximum<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Maximum);
      m_sliceValue <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QDoubleSpinBox</span>();
      m_sliceValue<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(<span class="number">1000</span>);
      m_sliceLabelVisible <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QCheckBox</span>();
      m_sliceLabelArmFactor <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QDoubleSpinBox</span>();
      m_sliceLabelArmFactor<span class="operator">-</span><span class="operator">&gt;</span>setSingleStep(<span class="number">0.01</span>);
      m_sliceExploded <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QCheckBox</span>();
      m_sliceExplodedFactor <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QDoubleSpinBox</span>();
      m_sliceExplodedFactor<span class="operator">-</span><span class="operator">&gt;</span>setSingleStep(<span class="number">0.01</span>);
      m_pen <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>();
      m_penTool <span class="operator">=</span> <span class="keyword">new</span> PenTool(<span class="string">&quot;Slice pen&quot;</span><span class="operator">,</span> <span class="keyword">this</span>);
      m_brush <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>();
      m_brushTool <span class="operator">=</span> <span class="keyword">new</span> BrushTool(<span class="string">&quot;Slice brush&quot;</span><span class="operator">,</span> <span class="keyword">this</span>);
      m_font <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>();
      m_labelBrush <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>();
      m_labelBrushTool <span class="operator">=</span> <span class="keyword">new</span> BrushTool(<span class="string">&quot;Label brush&quot;</span><span class="operator">,</span> <span class="keyword">this</span>);
      m_labelPosition <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QComboBox</span>(<span class="keyword">this</span>);
      m_labelPosition<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;Outside&quot;</span><span class="operator">,</span> <span class="type"><a href="qpieslice.html">QPieSlice</a></span><span class="operator">::</span>LabelOutside);
      m_labelPosition<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;Inside horizontal&quot;</span><span class="operator">,</span> <span class="type"><a href="qpieslice.html">QPieSlice</a></span><span class="operator">::</span>LabelInsideHorizontal);
      m_labelPosition<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;Inside tangential&quot;</span><span class="operator">,</span> <span class="type"><a href="qpieslice.html">QPieSlice</a></span><span class="operator">::</span>LabelInsideTangential);
      m_labelPosition<span class="operator">-</span><span class="operator">&gt;</span>addItem(<span class="string">&quot;Inside normal&quot;</span><span class="operator">,</span> <span class="type"><a href="qpieslice.html">QPieSlice</a></span><span class="operator">::</span>LabelInsideNormal);

      <span class="type">QFormLayout</span> <span class="operator">*</span>sliceSettingsLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QFormLayout</span>();
      sliceSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Label&quot;</span><span class="operator">,</span> m_sliceName);
      sliceSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Value&quot;</span><span class="operator">,</span> m_sliceValue);
      sliceSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Pen&quot;</span><span class="operator">,</span> m_pen);
      sliceSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Brush&quot;</span><span class="operator">,</span> m_brush);
      sliceSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Label visible&quot;</span><span class="operator">,</span> m_sliceLabelVisible);
      sliceSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Label font&quot;</span><span class="operator">,</span> m_font);
      sliceSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Label brush&quot;</span><span class="operator">,</span> m_labelBrush);
      sliceSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Label position&quot;</span><span class="operator">,</span> m_labelPosition);
      sliceSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Label arm length&quot;</span><span class="operator">,</span> m_sliceLabelArmFactor);
      sliceSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Exploded&quot;</span><span class="operator">,</span> m_sliceExploded);
      sliceSettingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addRow(<span class="string">&quot;Explode distance&quot;</span><span class="operator">,</span> m_sliceExplodedFactor);
      <span class="type">QGroupBox</span> <span class="operator">*</span>sliceSettings <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGroupBox</span>(<span class="string">&quot;Selected slice&quot;</span>);
      sliceSettings<span class="operator">-</span><span class="operator">&gt;</span>setLayout(sliceSettingsLayout);

      connect(m_sliceName<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QLineEdit</span><span class="operator">::</span>textChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSliceSettings);
      connect(m_sliceValue<span class="operator">,</span>
              <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type">QDoubleSpinBox</span><span class="operator">::</span><span class="operator">*</span>)(<span class="type">double</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type">QDoubleSpinBox</span><span class="operator">::</span>valueChanged)<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSliceSettings);
      connect(m_pen<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QPushButton</span><span class="operator">::</span>clicked<span class="operator">,</span> m_penTool<span class="operator">,</span> <span class="operator">&amp;</span>PenTool<span class="operator">::</span>show);
      connect(m_penTool<span class="operator">,</span> <span class="operator">&amp;</span>PenTool<span class="operator">::</span>changed<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSliceSettings);
      connect(m_brush<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QPushButton</span><span class="operator">::</span>clicked<span class="operator">,</span> m_brushTool<span class="operator">,</span> <span class="operator">&amp;</span>BrushTool<span class="operator">::</span>show);
      connect(m_brushTool<span class="operator">,</span> <span class="operator">&amp;</span>BrushTool<span class="operator">::</span>changed<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSliceSettings);
      connect(m_font<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QPushButton</span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>showFontDialog);
      connect(m_labelBrush<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QPushButton</span><span class="operator">::</span>clicked<span class="operator">,</span> m_labelBrushTool<span class="operator">,</span> <span class="operator">&amp;</span>BrushTool<span class="operator">::</span>show);
      connect(m_labelBrushTool<span class="operator">,</span> <span class="operator">&amp;</span>BrushTool<span class="operator">::</span>changed<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSliceSettings);
      connect(m_sliceLabelVisible<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QCheckBox</span><span class="operator">::</span>toggled<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSliceSettings);
      connect(m_sliceLabelVisible<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QCheckBox</span><span class="operator">::</span>toggled<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSliceSettings);
      connect(m_sliceLabelArmFactor<span class="operator">,</span>
              <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type">QDoubleSpinBox</span><span class="operator">::</span><span class="operator">*</span>)(<span class="type">double</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type">QDoubleSpinBox</span><span class="operator">::</span>valueChanged)<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSliceSettings);
      connect(m_sliceExploded<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QCheckBox</span><span class="operator">::</span>toggled<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSliceSettings);
      connect(m_sliceExplodedFactor<span class="operator">,</span>
              <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type">QDoubleSpinBox</span><span class="operator">::</span><span class="operator">*</span>)(<span class="type">double</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type">QDoubleSpinBox</span><span class="operator">::</span>valueChanged)<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSliceSettings);
      connect(m_labelPosition<span class="operator">,</span>
              <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type">QComboBox</span><span class="operator">::</span><span class="operator">*</span>)(<span class="type">int</span>)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type">QComboBox</span><span class="operator">::</span>currentIndexChanged)<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWidget<span class="operator">::</span>updateSliceSettings);

      <span class="comment">// create chart view</span>
      m_chartView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchartview.html">QChartView</a></span>(chart);

      <span class="comment">// create main layout</span>
      <span class="type">QVBoxLayout</span> <span class="operator">*</span>settingsLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QVBoxLayout</span>();
      settingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(chartSettings);
      settingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(seriesSettings);
      settingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(sliceSettings);
      settingsLayout<span class="operator">-</span><span class="operator">&gt;</span>addStretch();

      <span class="type">QGridLayout</span> <span class="operator">*</span>baseLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGridLayout</span>();
      baseLayout<span class="operator">-</span><span class="operator">&gt;</span>addLayout(settingsLayout<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
      baseLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(m_chartView<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>);
      setLayout(baseLayout);

      updateSerieSettings();
      updateChartSettings();
  }

  <span class="type">void</span> MainWidget<span class="operator">::</span>updateChartSettings()
  {
      <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartTheme theme <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartTheme<span class="operator">&gt;</span>(m_themeComboBox<span class="operator">-</span><span class="operator">&gt;</span>itemData(
                  m_themeComboBox<span class="operator">-</span><span class="operator">&gt;</span>currentIndex())<span class="operator">.</span>toInt());
      m_chartView<span class="operator">-</span><span class="operator">&gt;</span>chart()<span class="operator">-</span><span class="operator">&gt;</span>setTheme(theme);
      m_chartView<span class="operator">-</span><span class="operator">&gt;</span>setRenderHint(<span class="type">QPainter</span><span class="operator">::</span>Antialiasing<span class="operator">,</span> m_aaCheckBox<span class="operator">-</span><span class="operator">&gt;</span>isChecked());

      <span class="keyword">if</span> (m_animationsCheckBox<span class="operator">-</span><span class="operator">&gt;</span>checkState() <span class="operator">=</span><span class="operator">=</span> <span class="type">Qt</span><span class="operator">::</span>Checked)
          m_chartView<span class="operator">-</span><span class="operator">&gt;</span>chart()<span class="operator">-</span><span class="operator">&gt;</span>setAnimationOptions(<span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>AllAnimations);
      <span class="keyword">else</span>
          m_chartView<span class="operator">-</span><span class="operator">&gt;</span>chart()<span class="operator">-</span><span class="operator">&gt;</span>setAnimationOptions(<span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>NoAnimation);

      <span class="keyword">if</span> (m_legendCheckBox<span class="operator">-</span><span class="operator">&gt;</span>checkState() <span class="operator">=</span><span class="operator">=</span> <span class="type">Qt</span><span class="operator">::</span>Checked)
          m_chartView<span class="operator">-</span><span class="operator">&gt;</span>chart()<span class="operator">-</span><span class="operator">&gt;</span>legend()<span class="operator">-</span><span class="operator">&gt;</span>show();
      <span class="keyword">else</span>
          m_chartView<span class="operator">-</span><span class="operator">&gt;</span>chart()<span class="operator">-</span><span class="operator">&gt;</span>legend()<span class="operator">-</span><span class="operator">&gt;</span>hide();
  }

  <span class="type">void</span> MainWidget<span class="operator">::</span>updateSerieSettings()
  {
      m_series<span class="operator">-</span><span class="operator">&gt;</span>setHorizontalPosition(m_hPosition<span class="operator">-</span><span class="operator">&gt;</span>value());
      m_series<span class="operator">-</span><span class="operator">&gt;</span>setVerticalPosition(m_vPosition<span class="operator">-</span><span class="operator">&gt;</span>value());
      m_series<span class="operator">-</span><span class="operator">&gt;</span>setPieSize(m_sizeFactor<span class="operator">-</span><span class="operator">&gt;</span>value());
      m_holeSize<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(m_sizeFactor<span class="operator">-</span><span class="operator">&gt;</span>value());
      m_series<span class="operator">-</span><span class="operator">&gt;</span>setPieStartAngle(m_startAngle<span class="operator">-</span><span class="operator">&gt;</span>value());
      m_series<span class="operator">-</span><span class="operator">&gt;</span>setPieEndAngle(m_endAngle<span class="operator">-</span><span class="operator">&gt;</span>value());
      m_series<span class="operator">-</span><span class="operator">&gt;</span>setHoleSize(m_holeSize<span class="operator">-</span><span class="operator">&gt;</span>value());
  }

  <span class="type">void</span> MainWidget<span class="operator">::</span>updateSliceSettings()
  {
      <span class="keyword">if</span> (<span class="operator">!</span>m_slice)
          <span class="keyword">return</span>;

      m_slice<span class="operator">-</span><span class="operator">&gt;</span>setLabel(m_sliceName<span class="operator">-</span><span class="operator">&gt;</span>text());

      m_slice<span class="operator">-</span><span class="operator">&gt;</span>setValue(m_sliceValue<span class="operator">-</span><span class="operator">&gt;</span>value());

      m_slice<span class="operator">-</span><span class="operator">&gt;</span>setPen(m_penTool<span class="operator">-</span><span class="operator">&gt;</span>pen());
      m_slice<span class="operator">-</span><span class="operator">&gt;</span>setBrush(m_brushTool<span class="operator">-</span><span class="operator">&gt;</span>brush());

      m_slice<span class="operator">-</span><span class="operator">&gt;</span>setLabelBrush(m_labelBrushTool<span class="operator">-</span><span class="operator">&gt;</span>brush());
      m_slice<span class="operator">-</span><span class="operator">&gt;</span>setLabelVisible(m_sliceLabelVisible<span class="operator">-</span><span class="operator">&gt;</span>isChecked());
      m_slice<span class="operator">-</span><span class="operator">&gt;</span>setLabelArmLengthFactor(m_sliceLabelArmFactor<span class="operator">-</span><span class="operator">&gt;</span>value());
      <span class="comment">// We assume that label position index is in sync with the enum</span>
      m_slice<span class="operator">-</span><span class="operator">&gt;</span>setLabelPosition((<span class="type"><a href="qpieslice.html">QPieSlice</a></span><span class="operator">::</span>LabelPosition)m_labelPosition<span class="operator">-</span><span class="operator">&gt;</span>currentIndex());

      m_slice<span class="operator">-</span><span class="operator">&gt;</span>setExploded(m_sliceExploded<span class="operator">-</span><span class="operator">&gt;</span>isChecked());
      m_slice<span class="operator">-</span><span class="operator">&gt;</span>setExplodeDistanceFactor(m_sliceExplodedFactor<span class="operator">-</span><span class="operator">&gt;</span>value());
  }

  <span class="type">void</span> MainWidget<span class="operator">::</span>handleSliceClicked(<span class="type"><a href="qpieslice.html">QPieSlice</a></span> <span class="operator">*</span>slice)
  {
      m_slice <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span>CustomSlice <span class="operator">*</span><span class="operator">&gt;</span>(slice);

      <span class="comment">// name</span>
      m_sliceName<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">true</span>);
      m_sliceName<span class="operator">-</span><span class="operator">&gt;</span>setText(slice<span class="operator">-</span><span class="operator">&gt;</span>label());
      m_sliceName<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">false</span>);

      <span class="comment">// value</span>
      m_sliceValue<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">true</span>);
      m_sliceValue<span class="operator">-</span><span class="operator">&gt;</span>setValue(slice<span class="operator">-</span><span class="operator">&gt;</span>value());
      m_sliceValue<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">false</span>);

      <span class="comment">// pen</span>
      m_pen<span class="operator">-</span><span class="operator">&gt;</span>setText(PenTool<span class="operator">::</span>name(m_slice<span class="operator">-</span><span class="operator">&gt;</span>pen()));
      m_penTool<span class="operator">-</span><span class="operator">&gt;</span>setPen(m_slice<span class="operator">-</span><span class="operator">&gt;</span>pen());

      <span class="comment">// brush</span>
      m_brush<span class="operator">-</span><span class="operator">&gt;</span>setText(m_slice<span class="operator">-</span><span class="operator">&gt;</span>originalBrush()<span class="operator">.</span>color()<span class="operator">.</span>name());
      m_brushTool<span class="operator">-</span><span class="operator">&gt;</span>setBrush(m_slice<span class="operator">-</span><span class="operator">&gt;</span>originalBrush());

      <span class="comment">// label</span>
      m_labelBrush<span class="operator">-</span><span class="operator">&gt;</span>setText(BrushTool<span class="operator">::</span>name(m_slice<span class="operator">-</span><span class="operator">&gt;</span>labelBrush()));
      m_labelBrushTool<span class="operator">-</span><span class="operator">&gt;</span>setBrush(m_slice<span class="operator">-</span><span class="operator">&gt;</span>labelBrush());
      m_font<span class="operator">-</span><span class="operator">&gt;</span>setText(slice<span class="operator">-</span><span class="operator">&gt;</span>labelFont()<span class="operator">.</span>toString());
      m_sliceLabelVisible<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">true</span>);
      m_sliceLabelVisible<span class="operator">-</span><span class="operator">&gt;</span>setChecked(slice<span class="operator">-</span><span class="operator">&gt;</span>isLabelVisible());
      m_sliceLabelVisible<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">false</span>);
      m_sliceLabelArmFactor<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">true</span>);
      m_sliceLabelArmFactor<span class="operator">-</span><span class="operator">&gt;</span>setValue(slice<span class="operator">-</span><span class="operator">&gt;</span>labelArmLengthFactor());
      m_sliceLabelArmFactor<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">false</span>);
      m_labelPosition<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">true</span>);
      <span class="comment">// We assume that label position index is in sync with the enum</span>
      m_labelPosition<span class="operator">-</span><span class="operator">&gt;</span>setCurrentIndex(slice<span class="operator">-</span><span class="operator">&gt;</span>labelPosition());
      m_labelPosition<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">false</span>);

      <span class="comment">// exploded</span>
      m_sliceExploded<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">true</span>);
      m_sliceExploded<span class="operator">-</span><span class="operator">&gt;</span>setChecked(slice<span class="operator">-</span><span class="operator">&gt;</span>isExploded());
      m_sliceExploded<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">false</span>);
      m_sliceExplodedFactor<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">true</span>);
      m_sliceExplodedFactor<span class="operator">-</span><span class="operator">&gt;</span>setValue(slice<span class="operator">-</span><span class="operator">&gt;</span>explodeDistanceFactor());
      m_sliceExplodedFactor<span class="operator">-</span><span class="operator">&gt;</span>blockSignals(<span class="keyword">false</span>);
  }

  <span class="type">void</span> MainWidget<span class="operator">::</span>showFontDialog()
  {
      <span class="keyword">if</span> (<span class="operator">!</span>m_slice)
          <span class="keyword">return</span>;

      <span class="type">QFontDialog</span> dialog(m_slice<span class="operator">-</span><span class="operator">&gt;</span>labelFont());
      dialog<span class="operator">.</span>show();
      dialog<span class="operator">.</span>exec();

      m_slice<span class="operator">-</span><span class="operator">&gt;</span>setLabelFont(dialog<span class="operator">.</span>currentFont());
      m_font<span class="operator">-</span><span class="operator">&gt;</span>setText(dialog<span class="operator">.</span>currentFont()<span class="operator">.</span>toString());
  }

  <span class="type">void</span> MainWidget<span class="operator">::</span>appendSlice()
  {
      <span class="operator">*</span>m_series <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="keyword">new</span> CustomSlice(<span class="string">&quot;Slice &quot;</span> <span class="operator">+</span> <span class="type">QString</span><span class="operator">::</span>number(m_series<span class="operator">-</span><span class="operator">&gt;</span>count() <span class="operator">+</span> <span class="number">1</span>)<span class="operator">,</span> <span class="number">10.0</span>);
  }

  <span class="type">void</span> MainWidget<span class="operator">::</span>insertSlice()
  {
      <span class="keyword">if</span> (<span class="operator">!</span>m_slice)
          <span class="keyword">return</span>;

      <span class="type">int</span> i <span class="operator">=</span> m_series<span class="operator">-</span><span class="operator">&gt;</span>slices()<span class="operator">.</span>indexOf(m_slice);

      m_series<span class="operator">-</span><span class="operator">&gt;</span>insert(i<span class="operator">,</span> <span class="keyword">new</span> CustomSlice(<span class="string">&quot;Slice &quot;</span> <span class="operator">+</span> <span class="type">QString</span><span class="operator">::</span>number(m_series<span class="operator">-</span><span class="operator">&gt;</span>count() <span class="operator">+</span> <span class="number">1</span>)<span class="operator">,</span> <span class="number">10.0</span>));
  }

  <span class="type">void</span> MainWidget<span class="operator">::</span>removeSlice()
  {
      <span class="keyword">if</span> (<span class="operator">!</span>m_slice)
          <span class="keyword">return</span>;

      m_sliceName<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="string">&quot;&lt;click a slice&gt;&quot;</span>);

      m_series<span class="operator">-</span><span class="operator">&gt;</span>remove(m_slice);
      m_slice <span class="operator">=</span> <span class="number">0</span>;
  }

  <span class="preprocessor">#include &quot;moc_mainwidget.cpp&quot;</span>

</pre>
</div>
<!-- @@@piechartcustomization/mainwidget.cpp -->
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   Documentation contributions included herein are the copyrights of
   their respective owners.<br>    The documentation provided herein is licensed under the terms of the    <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation    License version 1.3</a> as published by the Free Software Foundation.<br>    Qt and respective logos are trademarks of The Qt Company Ltd.     in Finland and/or other countries worldwide. All other trademarks are property
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