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<h1 class="title">circlewidget.cpp Example File</h1>
<span class="subtitle">painting/concentriccircles/circlewidget.cpp</span>
<!-- $$$painting/concentriccircles/circlewidget.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.
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  <span class="preprocessor">#include &quot;circlewidget.h&quot;</span>

  <span class="preprocessor">#include &lt;QPainter&gt;</span>

  <span class="preprocessor">#include &lt;stdlib.h&gt;</span>

  CircleWidget<span class="operator">::</span>CircleWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
  {
      floatBased <span class="operator">=</span> <span class="keyword">false</span>;
      antialiased <span class="operator">=</span> <span class="keyword">false</span>;
      frameNo <span class="operator">=</span> <span class="number">0</span>;

      setBackgroundRole(<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Base);
      setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Expanding<span class="operator">,</span> <span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Expanding);
  }

  <span class="type">void</span> CircleWidget<span class="operator">::</span>setFloatBased(bool floatBased)
  {
      <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>floatBased <span class="operator">=</span> floatBased;
      update();
  }

  <span class="type">void</span> CircleWidget<span class="operator">::</span>setAntialiased(bool antialiased)
  {
      <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>antialiased <span class="operator">=</span> antialiased;
      update();
  }

  <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> CircleWidget<span class="operator">::</span>minimumSizeHint() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">50</span><span class="operator">,</span> <span class="number">50</span>);
  }

  <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> CircleWidget<span class="operator">::</span>sizeHint() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">180</span><span class="operator">,</span> <span class="number">180</span>);
  }

  <span class="type">void</span> CircleWidget<span class="operator">::</span>nextAnimationFrame()
  {
      <span class="operator">+</span><span class="operator">+</span>frameNo;
      update();
  }

  <span class="type">void</span> CircleWidget<span class="operator">::</span>paintEvent(<span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>)
  {
      <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>);
      painter<span class="operator">.</span>setRenderHint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> antialiased);
      painter<span class="operator">.</span>translate(width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> height() <span class="operator">/</span> <span class="number">2</span>);

      <span class="keyword">for</span> (<span class="type">int</span> diameter <span class="operator">=</span> <span class="number">0</span>; diameter <span class="operator">&lt;</span> <span class="number">256</span>; diameter <span class="operator">+</span><span class="operator">=</span> <span class="number">9</span>) {
          <span class="type">int</span> delta <span class="operator">=</span> abs((frameNo <span class="operator">%</span> <span class="number">128</span>) <span class="operator">-</span> diameter <span class="operator">/</span> <span class="number">2</span>);
          <span class="type">int</span> alpha <span class="operator">=</span> <span class="number">255</span> <span class="operator">-</span> (delta <span class="operator">*</span> delta) <span class="operator">/</span> <span class="number">4</span> <span class="operator">-</span> diameter;
          <span class="keyword">if</span> (alpha <span class="operator">&gt;</span> <span class="number">0</span>) {
              painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtgui/qpen.html">QPen</a></span>(<span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">0</span><span class="operator">,</span> diameter <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> <span class="number">127</span><span class="operator">,</span> alpha)<span class="operator">,</span> <span class="number">3</span>));

              <span class="keyword">if</span> (floatBased)
                  painter<span class="operator">.</span>drawEllipse(<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="operator">-</span>diameter <span class="operator">/</span> <span class="number">2.0</span><span class="operator">,</span> <span class="operator">-</span>diameter <span class="operator">/</span> <span class="number">2.0</span><span class="operator">,</span> diameter<span class="operator">,</span> diameter));
              <span class="keyword">else</span>
                  painter<span class="operator">.</span>drawEllipse(<span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(<span class="operator">-</span>diameter <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> <span class="operator">-</span>diameter <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> diameter<span class="operator">,</span> diameter));
          }
      }
  }

</pre>
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<!-- @@@painting/concentriccircles/circlewidget.cpp -->
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