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<h1 class="title">customformatter.cpp Example File</h1>
<span class="subtitle">qmlaxisformatter/customformatter.cpp</span>
<!-- $$$qmlaxisformatter/customformatter.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.
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;customformatter.h&quot;</span>
  <span class="preprocessor">#include &lt;QtDataVisualization/QValue3DAxis&gt;</span>
  <span class="preprocessor">#include &lt;QtQml/QQmlExtensionPlugin&gt;</span>
  <span class="preprocessor">#include &lt;QtCore/QDebug&gt;</span>

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

  Q_DECLARE_METATYPE(QValue3DAxisFormatter <span class="operator">*</span>)

  <span class="keyword">static</span> <span class="keyword">const</span> <span class="type">qreal</span> oneDayMs <span class="operator">=</span> <span class="number">60.0</span> <span class="operator">*</span> <span class="number">60.0</span> <span class="operator">*</span> <span class="number">24.0</span> <span class="operator">*</span> <span class="number">1000.0</span>;

  CustomFormatter<span class="operator">::</span>CustomFormatter(<span class="type">QObject</span> <span class="operator">*</span>parent) :
      QValue3DAxisFormatter(parent)
  {
      qRegisterMetaType<span class="operator">&lt;</span>QValue3DAxisFormatter <span class="operator">*</span><span class="operator">&gt;</span>();
  }

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

  QValue3DAxisFormatter <span class="operator">*</span>CustomFormatter<span class="operator">::</span>createNewInstance() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> <span class="keyword">new</span> CustomFormatter();
  }

  <span class="type">void</span> CustomFormatter<span class="operator">::</span>populateCopy(QValue3DAxisFormatter <span class="operator">&amp;</span>copy) <span class="keyword">const</span>
  {
      QValue3DAxisFormatter<span class="operator">::</span>populateCopy(copy);

      CustomFormatter <span class="operator">*</span>customFormatter <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span>CustomFormatter <span class="operator">*</span><span class="operator">&gt;</span>(<span class="operator">&amp;</span>copy);
      customFormatter<span class="operator">-</span><span class="operator">&gt;</span>m_originDate <span class="operator">=</span> m_originDate;
      customFormatter<span class="operator">-</span><span class="operator">&gt;</span>m_selectionFormat <span class="operator">=</span> m_selectionFormat;
  }

  <span class="type">void</span> CustomFormatter<span class="operator">::</span>recalculate()
  {
      <span class="comment">// We want our axis to always have gridlines at date breaks</span>

      <span class="comment">// Convert range into QDateTimes</span>
      <span class="type">QDateTime</span> minTime <span class="operator">=</span> valueToDateTime(<span class="type">qreal</span>(axis()<span class="operator">-</span><span class="operator">&gt;</span>min()));
      <span class="type">QDateTime</span> maxTime <span class="operator">=</span> valueToDateTime(<span class="type">qreal</span>(axis()<span class="operator">-</span><span class="operator">&gt;</span>max()));

      <span class="comment">// Find out the grid counts</span>
      <span class="type">QTime</span> midnight(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
      <span class="type">QDateTime</span> minFullDate(minTime<span class="operator">.</span>date()<span class="operator">,</span> midnight);
      <span class="type">int</span> gridCount <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">if</span> (minFullDate <span class="operator">!</span><span class="operator">=</span> minTime)
          minFullDate <span class="operator">=</span> minFullDate<span class="operator">.</span>addDays(<span class="number">1</span>);
      <span class="type">QDateTime</span> maxFullDate(maxTime<span class="operator">.</span>date()<span class="operator">,</span> midnight);

      gridCount <span class="operator">+</span><span class="operator">=</span> minFullDate<span class="operator">.</span>daysTo(maxFullDate) <span class="operator">+</span> <span class="number">1</span>;
      <span class="type">int</span> subGridCount <span class="operator">=</span> axis()<span class="operator">-</span><span class="operator">&gt;</span>subSegmentCount() <span class="operator">-</span> <span class="number">1</span>;

      <span class="comment">// Reserve space for position arrays and label strings</span>
      gridPositions()<span class="operator">.</span>resize(gridCount);
      subGridPositions()<span class="operator">.</span>resize((gridCount <span class="operator">+</span> <span class="number">1</span>) <span class="operator">*</span> subGridCount);
      labelPositions()<span class="operator">.</span>resize(gridCount);
      labelStrings()<span class="operator">.</span>reserve(gridCount);

      <span class="comment">// Calculate positions and format labels</span>
      <span class="type">qint64</span> startMs <span class="operator">=</span> minTime<span class="operator">.</span>toMSecsSinceEpoch();
      <span class="type">qint64</span> endMs <span class="operator">=</span> maxTime<span class="operator">.</span>toMSecsSinceEpoch();
      <span class="type">qreal</span> dateNormalizer <span class="operator">=</span> endMs <span class="operator">-</span> startMs;
      <span class="type">qreal</span> firstLineOffset <span class="operator">=</span> (minFullDate<span class="operator">.</span>toMSecsSinceEpoch() <span class="operator">-</span> startMs) <span class="operator">/</span> dateNormalizer;
      <span class="type">qreal</span> segmentStep <span class="operator">=</span> oneDayMs <span class="operator">/</span> dateNormalizer;
      <span class="type">qreal</span> subSegmentStep <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">if</span> (subGridCount <span class="operator">&gt;</span> <span class="number">0</span>)
          subSegmentStep <span class="operator">=</span> segmentStep <span class="operator">/</span> <span class="type">qreal</span>(subGridCount <span class="operator">+</span> <span class="number">1</span>);

      <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> gridCount; i<span class="operator">+</span><span class="operator">+</span>) {
          <span class="type">qreal</span> gridValue <span class="operator">=</span> firstLineOffset <span class="operator">+</span> (segmentStep <span class="operator">*</span> <span class="type">qreal</span>(i));
          gridPositions()<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> <span class="type">float</span>(gridValue);
          labelPositions()<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> <span class="type">float</span>(gridValue);
          labelStrings() <span class="operator">&lt;</span><span class="operator">&lt;</span> minFullDate<span class="operator">.</span>addDays(i)<span class="operator">.</span>toString(axis()<span class="operator">-</span><span class="operator">&gt;</span>labelFormat());
      }

      <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="operator">=</span> gridCount; i<span class="operator">+</span><span class="operator">+</span>) {
          <span class="keyword">if</span> (subGridPositions()<span class="operator">.</span>size()) {
              <span class="keyword">for</span> (<span class="type">int</span> j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator">&lt;</span> subGridCount; j<span class="operator">+</span><span class="operator">+</span>) {
                  <span class="type">float</span> position;
                  <span class="keyword">if</span> (i)
                      position <span class="operator">=</span>  gridPositions()<span class="operator">.</span>at(i <span class="operator">-</span> <span class="number">1</span>) <span class="operator">+</span> subSegmentStep <span class="operator">*</span> (j <span class="operator">+</span> <span class="number">1</span>);
                  <span class="keyword">else</span>
                      position <span class="operator">=</span>  gridPositions()<span class="operator">.</span>at(<span class="number">0</span>) <span class="operator">-</span> segmentStep <span class="operator">+</span> subSegmentStep <span class="operator">*</span> (j <span class="operator">+</span> <span class="number">1</span>);
                  <span class="keyword">if</span> (position <span class="operator">&gt;</span> <span class="number">1.0f</span> <span class="operator">|</span><span class="operator">|</span> position <span class="operator">&lt;</span> <span class="number">0.0f</span>)
                      position <span class="operator">=</span> gridPositions()<span class="operator">.</span>at(<span class="number">0</span>);
                  subGridPositions()<span class="operator">[</span>i <span class="operator">*</span> subGridCount <span class="operator">+</span> j<span class="operator">]</span> <span class="operator">=</span> position;
              }
          }
      }
  }

  <span class="type">QString</span> CustomFormatter<span class="operator">::</span>stringForValue(<span class="type">qreal</span> value<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>format) <span class="keyword">const</span>
  {
      Q_UNUSED(format)

      <span class="keyword">return</span> valueToDateTime(value)<span class="operator">.</span>toString(m_selectionFormat);
  }

  <span class="type">QDate</span> CustomFormatter<span class="operator">::</span>originDate() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_originDate;
  }

  <span class="type">QString</span> CustomFormatter<span class="operator">::</span>selectionFormat() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_selectionFormat;
  }

  <span class="type">void</span> CustomFormatter<span class="operator">::</span>setOriginDate(<span class="keyword">const</span> <span class="type">QDate</span> <span class="operator">&amp;</span>date)
  {
      <span class="keyword">if</span> (m_originDate <span class="operator">!</span><span class="operator">=</span> date) {
          m_originDate <span class="operator">=</span> date;
          markDirty(<span class="keyword">true</span>);
          <span class="keyword">emit</span> originDateChanged(date);
      }
  }

  <span class="type">void</span> CustomFormatter<span class="operator">::</span>setSelectionFormat(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>format)
  {
      <span class="keyword">if</span> (m_selectionFormat <span class="operator">!</span><span class="operator">=</span> format) {
          m_selectionFormat <span class="operator">=</span> format;
          markDirty(<span class="keyword">true</span>); <span class="comment">// Necessary to regenerate already visible selection label</span>
          <span class="keyword">emit</span> selectionFormatChanged(format);
      }
  }

  <span class="type">QDateTime</span> CustomFormatter<span class="operator">::</span>valueToDateTime(<span class="type">qreal</span> value) <span class="keyword">const</span>
  {
      <span class="keyword">return</span> <span class="type">QDateTime</span>(m_originDate)<span class="operator">.</span>addMSecs(<span class="type">qint64</span>(oneDayMs <span class="operator">*</span> value));
  }

</pre>
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<!-- @@@qmlaxisformatter/customformatter.cpp -->
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