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<h1 class="title">rainfallgraph.cpp Example File</h1>
<span class="subtitle">customproxy/rainfallgraph.cpp</span>
<!-- $$$customproxy/rainfallgraph.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 Data Visualization 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.
  **
  ** $QT_END_LICENSE$
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  <span class="preprocessor">#include &quot;rainfallgraph.h&quot;</span>
  <span class="preprocessor">#include &lt;QtDataVisualization/qcategory3daxis.h&gt;</span>
  <span class="preprocessor">#include &lt;QtDataVisualization/qvalue3daxis.h&gt;</span>
  <span class="preprocessor">#include &lt;QtDataVisualization/q3dscene.h&gt;</span>
  <span class="preprocessor">#include &lt;QtDataVisualization/q3dcamera.h&gt;</span>
  <span class="preprocessor">#include &lt;QtDataVisualization/qbar3dseries.h&gt;</span>
  <span class="preprocessor">#include &lt;QtDataVisualization/q3dtheme.h&gt;</span>
  <span class="preprocessor">#include &lt;QtGui/QGuiApplication&gt;</span>
  <span class="preprocessor">#include &lt;QtGui/QFont&gt;</span>
  <span class="preprocessor">#include &lt;QtCore/QDebug&gt;</span>
  <span class="preprocessor">#include &lt;QtCore/QTextStream&gt;</span>
  <span class="preprocessor">#include &lt;QtCore/QFile&gt;</span>

  <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="type"><a href="qtdatavisualization-qmlmodule.html">QtDataVisualization</a></span>;

  RainfallGraph<span class="operator">::</span>RainfallGraph(<span class="type"><a href="q3dbars.html">Q3DBars</a></span> <span class="operator">*</span>rainfall)
      : m_graph(rainfall)
  {
      <span class="comment">// In data file the months are in numeric format, so create custom list</span>
      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">1</span>; i <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">12</span>; i<span class="operator">+</span><span class="operator">+</span>)
          m_numericMonths <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type">QString</span><span class="operator">::</span>number(i);

      m_columnCount <span class="operator">=</span> m_numericMonths<span class="operator">.</span>size();

      m_proxy <span class="operator">=</span> <span class="keyword">new</span> VariantBarDataProxy;
      QBar3DSeries <span class="operator">*</span>series <span class="operator">=</span> <span class="keyword">new</span> QBar3DSeries(m_proxy);
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>addSeries(series);

      updateYearsList(<span class="number">2000</span><span class="operator">,</span> <span class="number">2012</span>);

      <span class="comment">// Set up bar specifications; make the bars as wide as they are deep,</span>
      <span class="comment">// and add a small space between the bars</span>
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>setBarThickness(<span class="number">1.0f</span>);
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>setBarSpacing(<span class="type">QSizeF</span>(<span class="number">1.1</span><span class="operator">,</span> <span class="number">1.1</span>));

      <span class="comment">// Set axis labels and titles</span>
      <span class="type">QStringList</span> months;
      months <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;January&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;February&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;March&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;April&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;May&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;June&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;July&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;August&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;September&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;October&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;November&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;December&quot;</span>;
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>rowAxis()<span class="operator">-</span><span class="operator">&gt;</span>setTitle(<span class="string">&quot;Year&quot;</span>);
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>columnAxis()<span class="operator">-</span><span class="operator">&gt;</span>setTitle(<span class="string">&quot;Month&quot;</span>);
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>valueAxis()<span class="operator">-</span><span class="operator">&gt;</span>setTitle(<span class="string">&quot;rainfall&quot;</span>);
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>valueAxis()<span class="operator">-</span><span class="operator">&gt;</span>setLabelFormat(<span class="string">&quot;%d mm&quot;</span>);
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>valueAxis()<span class="operator">-</span><span class="operator">&gt;</span>setSegmentCount(<span class="number">5</span>);
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>rowAxis()<span class="operator">-</span><span class="operator">&gt;</span>setLabels(m_years);
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>columnAxis()<span class="operator">-</span><span class="operator">&gt;</span>setLabels(months);

      <span class="comment">// Set bar type to cylinder</span>
      series<span class="operator">-</span><span class="operator">&gt;</span>setMesh(QAbstract3DSeries<span class="operator">::</span>MeshCylinder);

      <span class="comment">// Set shadows to medium</span>
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>setShadowQuality(QAbstract3DGraph<span class="operator">::</span>ShadowQualityMedium);

      <span class="comment">// Set selection mode to bar and column</span>
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>setSelectionMode(QAbstract3DGraph<span class="operator">::</span>SelectionItemAndColumn <span class="operator">|</span> QAbstract3DGraph<span class="operator">::</span>SelectionSlice);

      <span class="comment">// Set theme</span>
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>activeTheme()<span class="operator">-</span><span class="operator">&gt;</span>setType(<span class="type"><a href="q3dtheme.html">Q3DTheme</a></span><span class="operator">::</span>ThemeArmyBlue);

      <span class="comment">// Override font in theme</span>
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>activeTheme()<span class="operator">-</span><span class="operator">&gt;</span>setFont(<span class="type">QFont</span>(<span class="string">&quot;Century Gothic&quot;</span><span class="operator">,</span> <span class="number">30</span>));

      <span class="comment">// Override label background for theme</span>
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>activeTheme()<span class="operator">-</span><span class="operator">&gt;</span>setLabelBackgroundEnabled(<span class="keyword">false</span>);

      <span class="comment">// Set camera position and zoom</span>
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>scene()<span class="operator">-</span><span class="operator">&gt;</span>activeCamera()<span class="operator">-</span><span class="operator">&gt;</span>setCameraPreset(<span class="type"><a href="q3dcamera.html">Q3DCamera</a></span><span class="operator">::</span>CameraPresetIsometricRightHigh);

      <span class="comment">// Set window title</span>
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>setTitle(<span class="type">QStringLiteral</span>(<span class="string">&quot;Monthly rainfall in Northern Finland&quot;</span>));

      <span class="comment">// Set reflections on</span>
      m_graph<span class="operator">-</span><span class="operator">&gt;</span>setReflection(<span class="keyword">true</span>);
  }

  RainfallGraph<span class="operator">::</span><span class="operator">~</span>RainfallGraph()
  {
      <span class="keyword">delete</span> m_mapping;
      <span class="keyword">delete</span> m_dataSet;
      <span class="keyword">delete</span> m_graph;
  }

  <span class="type">void</span> RainfallGraph<span class="operator">::</span>start()
  {
      addDataSet();
  }

  <span class="type">void</span> RainfallGraph<span class="operator">::</span>updateYearsList(<span class="type">int</span> start<span class="operator">,</span> <span class="type">int</span> end)
  {
      m_years<span class="operator">.</span>clear();
      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> start; i <span class="operator">&lt;</span><span class="operator">=</span> end; i<span class="operator">+</span><span class="operator">+</span>)
          m_years <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type">QString</span><span class="operator">::</span>number(i);

      m_rowCount <span class="operator">=</span> m_years<span class="operator">.</span>size();
  }

  <span class="type">void</span> RainfallGraph<span class="operator">::</span>addDataSet()
  {
      <span class="comment">// Create a new variant data set and data item list</span>
      m_dataSet <span class="operator">=</span>  <span class="keyword">new</span> VariantDataSet;
      VariantDataItemList <span class="operator">*</span>itemList <span class="operator">=</span> <span class="keyword">new</span> VariantDataItemList;

      <span class="comment">// Read data from a data file into the data item list</span>
      <span class="type">QTextStream</span> stream;
      <span class="type">QFile</span> dataFile(<span class="string">&quot;:/data/raindata.txt&quot;</span>);
      <span class="keyword">if</span> (dataFile<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>ReadOnly <span class="operator">|</span> <span class="type">QIODevice</span><span class="operator">::</span>Text)) {
          stream<span class="operator">.</span>setDevice(<span class="operator">&amp;</span>dataFile);
          <span class="keyword">while</span> (<span class="operator">!</span>stream<span class="operator">.</span>atEnd()) {
              <span class="type">QString</span> line <span class="operator">=</span> stream<span class="operator">.</span>readLine();
              <span class="keyword">if</span> (line<span class="operator">.</span>startsWith(<span class="string">&quot;#&quot;</span>)) <span class="comment">// Ignore comments</span>
                  <span class="keyword">continue</span>;
              <span class="type">QStringList</span> strList <span class="operator">=</span> line<span class="operator">.</span>split(<span class="string">&quot;,&quot;</span><span class="operator">,</span> <span class="type">QString</span><span class="operator">::</span>SkipEmptyParts);
              <span class="comment">// Each line has three data items: Year, month, and rainfall value</span>
              <span class="keyword">if</span> (strList<span class="operator">.</span>size() <span class="operator">&lt;</span> <span class="number">3</span>) {
                  qWarning() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Invalid row read from data:&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> line;
                  <span class="keyword">continue</span>;
              }
              <span class="comment">// Store year and month as strings, and rainfall value as double</span>
              <span class="comment">// into a variant data item and add the item to the item list.</span>
              VariantDataItem <span class="operator">*</span>newItem <span class="operator">=</span> <span class="keyword">new</span> VariantDataItem;
              <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> <span class="number">2</span>; i<span class="operator">+</span><span class="operator">+</span>)
                  newItem<span class="operator">-</span><span class="operator">&gt;</span>append(strList<span class="operator">.</span>at(i)<span class="operator">.</span>trimmed());
              newItem<span class="operator">-</span><span class="operator">&gt;</span>append(strList<span class="operator">.</span>at(<span class="number">2</span>)<span class="operator">.</span>trimmed()<span class="operator">.</span>toDouble());
              itemList<span class="operator">-</span><span class="operator">&gt;</span>append(newItem);
          }
      } <span class="keyword">else</span> {
          qWarning() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Unable to open data file:&quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> dataFile<span class="operator">.</span>fileName();
      }

      <span class="comment">// Add items to the data set and set it to the proxy</span>
      m_dataSet<span class="operator">-</span><span class="operator">&gt;</span>addItems(itemList);
      m_proxy<span class="operator">-</span><span class="operator">&gt;</span>setDataSet(m_dataSet);

      <span class="comment">// Create new mapping for the data and set it to the proxy</span>
      m_mapping <span class="operator">=</span>  <span class="keyword">new</span> VariantBarDataMapping(<span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> m_years<span class="operator">,</span> m_numericMonths);
      m_proxy<span class="operator">-</span><span class="operator">&gt;</span>setMapping(m_mapping);
  }

</pre>
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<!-- @@@customproxy/rainfallgraph.cpp -->
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