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<h1 class="title">helper.cpp Example File</h1>
<span class="subtitle">2dpainting/helper.cpp</span>
<!-- $$$2dpainting/helper.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:
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  ** modification, are permitted provided that the following conditions are
  ** met:
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  <span class="preprocessor">#include &quot;helper.h&quot;</span>

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

  Helper<span class="operator">::</span>Helper()
  {
      <span class="type"><a href="../qtgui/qlineargradient.html">QLinearGradient</a></span> gradient(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">50</span><span class="operator">,</span> <span class="operator">-</span><span class="number">20</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">80</span><span class="operator">,</span> <span class="number">20</span>));
      gradient<span class="operator">.</span>setColorAt(<span class="number">0.0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white);
      gradient<span class="operator">.</span>setColorAt(<span class="number">1.0</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">0xa6</span><span class="operator">,</span> <span class="number">0xce</span><span class="operator">,</span> <span class="number">0x39</span>));

      background <span class="operator">=</span> <span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span>(<span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">64</span><span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> <span class="number">64</span>));
      circleBrush <span class="operator">=</span> <span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span>(gradient);
      circlePen <span class="operator">=</span> <span class="type"><a href="../qtgui/qpen.html">QPen</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black);
      circlePen<span class="operator">.</span>setWidth(<span class="number">1</span>);
      textPen <span class="operator">=</span> <span class="type"><a href="../qtgui/qpen.html">QPen</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white);
      textFont<span class="operator">.</span>setPixelSize(<span class="number">50</span>);
  }

  <span class="type">void</span> Helper<span class="operator">::</span>paint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event<span class="operator">,</span> <span class="type">int</span> elapsed)
  {
      painter<span class="operator">-</span><span class="operator">&gt;</span>fillRect(event<span class="operator">-</span><span class="operator">&gt;</span>rect()<span class="operator">,</span> background);
      painter<span class="operator">-</span><span class="operator">&gt;</span>translate(<span class="number">100</span><span class="operator">,</span> <span class="number">100</span>);

      painter<span class="operator">-</span><span class="operator">&gt;</span>save();
      painter<span class="operator">-</span><span class="operator">&gt;</span>setBrush(circleBrush);
      painter<span class="operator">-</span><span class="operator">&gt;</span>setPen(circlePen);
      painter<span class="operator">-</span><span class="operator">&gt;</span>rotate(elapsed <span class="operator">*</span> <span class="number">0.030</span>);

      <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> r <span class="operator">=</span> elapsed <span class="operator">/</span> <span class="number">1000.0</span>;
      <span class="type">int</span> n <span class="operator">=</span> <span class="number">30</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> n; <span class="operator">+</span><span class="operator">+</span>i) {
          painter<span class="operator">-</span><span class="operator">&gt;</span>rotate(<span class="number">30</span>);
          <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> factor <span class="operator">=</span> (i <span class="operator">+</span> r) <span class="operator">/</span> n;
          <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> radius <span class="operator">=</span> <span class="number">0</span> <span class="operator">+</span> <span class="number">120.0</span> <span class="operator">*</span> factor;
          <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> circleRadius <span class="operator">=</span> <span class="number">1</span> <span class="operator">+</span> factor <span class="operator">*</span> <span class="number">20</span>;
          painter<span class="operator">-</span><span class="operator">&gt;</span>drawEllipse(<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(radius<span class="operator">,</span> <span class="operator">-</span>circleRadius<span class="operator">,</span>
                                      circleRadius <span class="operator">*</span> <span class="number">2</span><span class="operator">,</span> circleRadius <span class="operator">*</span> <span class="number">2</span>));
      }
      painter<span class="operator">-</span><span class="operator">&gt;</span>restore();

      painter<span class="operator">-</span><span class="operator">&gt;</span>setPen(textPen);
      painter<span class="operator">-</span><span class="operator">&gt;</span>setFont(textFont);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawText(<span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(<span class="operator">-</span><span class="number">50</span><span class="operator">,</span> <span class="operator">-</span><span class="number">50</span><span class="operator">,</span> <span class="number">100</span><span class="operator">,</span> <span class="number">100</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignCenter<span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">&quot;Qt&quot;</span>));
  }

</pre>
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<!-- @@@2dpainting/helper.cpp -->
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