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<h1 class="title">car.cpp Example File</h1>
<span class="subtitle">remotecontrolledcar/car/car.cpp</span>
<!-- $$$remotecontrolledcar/car/car.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 examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** 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.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
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  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;car.h&quot;</span>
  <span class="preprocessor">#include &lt;QtWidgets/QtWidgets&gt;</span>
  <span class="preprocessor">#include &lt;math.h&gt;</span>

  <span class="keyword">static</span> <span class="keyword">const</span> <span class="type">double</span> Pi <span class="operator">=</span> <span class="number">3.14159265358979323846264338327950288419717</span>;

  <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> Car<span class="operator">::</span>boundingRect() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="operator">-</span><span class="number">35</span><span class="operator">,</span> <span class="operator">-</span><span class="number">81</span><span class="operator">,</span> <span class="number">70</span><span class="operator">,</span> <span class="number">115</span>);
  }

  Car<span class="operator">::</span>Car() : color(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>green)<span class="operator">,</span> wheelsAngle(<span class="number">0</span>)<span class="operator">,</span> speed(<span class="number">0</span>)
  {
      startTimer(<span class="number">1000</span> <span class="operator">/</span> <span class="number">33</span>);
      setFlag(<span class="type">QGraphicsItem</span><span class="operator">::</span>ItemIsMovable<span class="operator">,</span> <span class="keyword">true</span>);
      setFlag(<span class="type">QGraphicsItem</span><span class="operator">::</span>ItemIsFocusable<span class="operator">,</span> <span class="keyword">true</span>);
  }

  <span class="type">void</span> Car<span class="operator">::</span>accelerate()
  {
      <span class="keyword">if</span> (speed <span class="operator">&lt;</span> <span class="number">10</span>)
          <span class="operator">+</span><span class="operator">+</span>speed;
  }

  <span class="type">void</span> Car<span class="operator">::</span>decelerate()
  {
      <span class="keyword">if</span> (speed <span class="operator">&gt;</span> <span class="operator">-</span><span class="number">10</span>)
          <span class="operator">-</span><span class="operator">-</span>speed;
  }

  <span class="type">void</span> Car<span class="operator">::</span>turnLeft()
  {
      <span class="keyword">if</span> (wheelsAngle <span class="operator">&gt;</span> <span class="operator">-</span><span class="number">30</span>)
          wheelsAngle <span class="operator">-</span><span class="operator">=</span> <span class="number">5</span>;
  }

  <span class="type">void</span> Car<span class="operator">::</span>turnRight()
  {
      <span class="keyword">if</span> (wheelsAngle <span class="operator">&lt;</span> <span class="number">30</span>)
         wheelsAngle <span class="operator">+</span><span class="operator">=</span> <span class="number">5</span>;
  }

  <span class="type">void</span> Car<span class="operator">::</span>paint(<span class="type">QPainter</span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QStyleOptionGraphicsItem</span> <span class="operator">*</span>option<span class="operator">,</span> <span class="type">QWidget</span> <span class="operator">*</span>widget)
  {
      Q_UNUSED(option);
      Q_UNUSED(widget);

      painter<span class="operator">-</span><span class="operator">&gt;</span>setBrush(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>gray);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawRect(<span class="operator">-</span><span class="number">20</span><span class="operator">,</span> <span class="operator">-</span><span class="number">58</span><span class="operator">,</span> <span class="number">40</span><span class="operator">,</span> <span class="number">2</span>); <span class="comment">// front axel</span>
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawRect(<span class="operator">-</span><span class="number">20</span><span class="operator">,</span> <span class="number">7</span><span class="operator">,</span> <span class="number">40</span><span class="operator">,</span> <span class="number">2</span>); <span class="comment">// rear axel</span>

      painter<span class="operator">-</span><span class="operator">&gt;</span>setBrush(color);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawRect(<span class="operator">-</span><span class="number">25</span><span class="operator">,</span> <span class="operator">-</span><span class="number">79</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">10</span>); <span class="comment">// front wing</span>

      painter<span class="operator">-</span><span class="operator">&gt;</span>drawEllipse(<span class="operator">-</span><span class="number">25</span><span class="operator">,</span> <span class="operator">-</span><span class="number">48</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">20</span>); <span class="comment">// side pods</span>
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawRect(<span class="operator">-</span><span class="number">25</span><span class="operator">,</span> <span class="operator">-</span><span class="number">38</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">35</span>); <span class="comment">// side pods</span>
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawRect(<span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="number">9</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">10</span>); <span class="comment">// back pod</span>

      painter<span class="operator">-</span><span class="operator">&gt;</span>drawEllipse(<span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">81</span><span class="operator">,</span> <span class="number">20</span><span class="operator">,</span> <span class="number">100</span>); <span class="comment">// main body</span>

      painter<span class="operator">-</span><span class="operator">&gt;</span>drawRect(<span class="operator">-</span><span class="number">17</span><span class="operator">,</span> <span class="number">19</span><span class="operator">,</span> <span class="number">34</span><span class="operator">,</span> <span class="number">15</span>); <span class="comment">// rear wing</span>

      painter<span class="operator">-</span><span class="operator">&gt;</span>setBrush(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawPie(<span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="operator">-</span><span class="number">51</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">15</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">180</span> <span class="operator">*</span> <span class="number">16</span>);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawRect(<span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="operator">-</span><span class="number">44</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">10</span>); <span class="comment">// cocpit</span>

      painter<span class="operator">-</span><span class="operator">&gt;</span>save();
      painter<span class="operator">-</span><span class="operator">&gt;</span>translate(<span class="operator">-</span><span class="number">20</span><span class="operator">,</span> <span class="operator">-</span><span class="number">58</span>);
      painter<span class="operator">-</span><span class="operator">&gt;</span>rotate(wheelsAngle);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawRect(<span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">7</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">15</span>); <span class="comment">// front left</span>
      painter<span class="operator">-</span><span class="operator">&gt;</span>restore();

      painter<span class="operator">-</span><span class="operator">&gt;</span>save();
      painter<span class="operator">-</span><span class="operator">&gt;</span>translate(<span class="number">20</span><span class="operator">,</span> <span class="operator">-</span><span class="number">58</span>);
      painter<span class="operator">-</span><span class="operator">&gt;</span>rotate(wheelsAngle);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawRect(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">7</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">15</span>); <span class="comment">// front left</span>
      painter<span class="operator">-</span><span class="operator">&gt;</span>restore();

      painter<span class="operator">-</span><span class="operator">&gt;</span>drawRect(<span class="operator">-</span><span class="number">30</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">12</span><span class="operator">,</span> <span class="number">17</span>); <span class="comment">// rear left</span>
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawRect(<span class="number">19</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">12</span><span class="operator">,</span> <span class="number">17</span>);  <span class="comment">// rear right</span>
  }

  <span class="type">void</span> Car<span class="operator">::</span>timerEvent(<span class="type"><a href="../qtcore/qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>event)
  {
      Q_UNUSED(event);

      <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> axelDistance <span class="operator">=</span> <span class="number">54</span>;
      <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> wheelsAngleRads <span class="operator">=</span> (wheelsAngle <span class="operator">*</span> Pi) <span class="operator">/</span> <span class="number">180</span>;
      <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> turnDistance <span class="operator">=</span> <span class="operator">::</span>cos(wheelsAngleRads) <span class="operator">*</span> axelDistance <span class="operator">*</span> <span class="number">2</span>;
      <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> turnRateRads <span class="operator">=</span> wheelsAngleRads <span class="operator">/</span> turnDistance;  <span class="comment">// rough estimate</span>
      <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> turnRate <span class="operator">=</span> (turnRateRads <span class="operator">*</span> <span class="number">180</span>) <span class="operator">/</span> Pi;
      <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> rotation <span class="operator">=</span> speed <span class="operator">*</span> turnRate;

      setTransform(<span class="type">QTransform</span>()<span class="operator">.</span>rotate(rotation)<span class="operator">,</span> <span class="keyword">true</span>);
      setTransform(<span class="type">QTransform</span><span class="operator">::</span>fromTranslate(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span>speed)<span class="operator">,</span> <span class="keyword">true</span>);
      update();
  }

</pre>
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<!-- @@@remotecontrolledcar/car/car.cpp -->
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