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<h1 class="title">chartview.cpp Example File</h1>
<span class="subtitle">scatterinteractions/chartview.cpp</span>
<!-- $$$scatterinteractions/chartview.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;chartview.h&quot;</span>
  <span class="preprocessor">#include &lt;QtCore/QtMath&gt;</span>
  <span class="preprocessor">#include &lt;QtCore/QDebug&gt;</span>

  QT_CHARTS_USE_NAMESPACE

  ChartView<span class="operator">::</span>ChartView(<span class="type">QWidget</span> <span class="operator">*</span>parent)
      : <span class="type"><a href="qchartview.html">QChartView</a></span>(<span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>()<span class="operator">,</span> parent)<span class="operator">,</span>
        m_scatter(<span class="number">0</span>)<span class="operator">,</span>
        m_scatter2(<span class="number">0</span>)
  {
      setRenderHint(<span class="type">QPainter</span><span class="operator">::</span>Antialiasing);

      chart()<span class="operator">-</span><span class="operator">&gt;</span>setTitle(<span class="string">&quot;Click to interact with scatter points&quot;</span>);

      m_scatter <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscatterseries.html">QScatterSeries</a></span>();
      m_scatter<span class="operator">-</span><span class="operator">&gt;</span>setName(<span class="string">&quot;scatter1&quot;</span>);
      <span class="keyword">for</span> (<span class="type">qreal</span> x(<span class="number">0.5</span>); x <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">4.0</span>; x <span class="operator">+</span><span class="operator">=</span> <span class="number">0.5</span>) {
          <span class="keyword">for</span> (<span class="type">qreal</span> y(<span class="number">0.5</span>); y <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">4.0</span>; y <span class="operator">+</span><span class="operator">=</span> <span class="number">0.5</span>)
              <span class="operator">*</span>m_scatter <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type">QPointF</span>(x<span class="operator">,</span> y);
      }
      m_scatter2 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscatterseries.html">QScatterSeries</a></span>();
      m_scatter2<span class="operator">-</span><span class="operator">&gt;</span>setName(<span class="string">&quot;scatter2&quot;</span>);

      chart()<span class="operator">-</span><span class="operator">&gt;</span>addSeries(m_scatter2);
      chart()<span class="operator">-</span><span class="operator">&gt;</span>addSeries(m_scatter);
      chart()<span class="operator">-</span><span class="operator">&gt;</span>createDefaultAxes();
      chart()<span class="operator">-</span><span class="operator">&gt;</span>axisX()<span class="operator">-</span><span class="operator">&gt;</span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">4.5</span>);
      chart()<span class="operator">-</span><span class="operator">&gt;</span>axisY()<span class="operator">-</span><span class="operator">&gt;</span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">4.5</span>);

      connect(m_scatter<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qscatterseries.html">QScatterSeries</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>ChartView<span class="operator">::</span>handleClickedPoint);
  }

  ChartView<span class="operator">::</span><span class="operator">~</span>ChartView()
  {
  }

  <span class="type">void</span> ChartView<span class="operator">::</span>handleClickedPoint(<span class="keyword">const</span> <span class="type">QPointF</span> <span class="operator">&amp;</span>point)
  {
      <span class="type">QPointF</span> clickedPoint <span class="operator">=</span> point;
      <span class="comment">// Find the closest point from series 1</span>
      <span class="type">QPointF</span> closest(INT_MAX<span class="operator">,</span> INT_MAX);
      <span class="type">qreal</span> distance(INT_MAX);
      <span class="keyword">const</span> <span class="keyword">auto</span> points <span class="operator">=</span> m_scatter<span class="operator">-</span><span class="operator">&gt;</span>points();
      <span class="keyword">for</span> (<span class="keyword">const</span> <span class="type">QPointF</span> <span class="operator">&amp;</span>currentPoint : points) {
          <span class="type">qreal</span> currentDistance <span class="operator">=</span> qSqrt((currentPoint<span class="operator">.</span>x() <span class="operator">-</span> clickedPoint<span class="operator">.</span>x())
                                        <span class="operator">*</span> (currentPoint<span class="operator">.</span>x() <span class="operator">-</span> clickedPoint<span class="operator">.</span>x())
                                        <span class="operator">+</span> (currentPoint<span class="operator">.</span>y() <span class="operator">-</span> clickedPoint<span class="operator">.</span>y())
                                        <span class="operator">*</span> (currentPoint<span class="operator">.</span>y() <span class="operator">-</span> clickedPoint<span class="operator">.</span>y()));
          <span class="keyword">if</span> (currentDistance <span class="operator">&lt;</span> distance) {
              distance <span class="operator">=</span> currentDistance;
              closest <span class="operator">=</span> currentPoint;
          }
      }

      <span class="comment">// Remove the closes point from series 1 and append it to series 2</span>
      m_scatter<span class="operator">-</span><span class="operator">&gt;</span>remove(closest);
      m_scatter2<span class="operator">-</span><span class="operator">&gt;</span>append(closest);
  }

</pre>
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<!-- @@@scatterinteractions/chartview.cpp -->
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