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📁 《Big C++ 》Third Edition电子书和代码全集-Part1

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	<title>Big C++: Chptr. 27 -- Graphical User Interfaces</title>
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  <meta name="Copyright" content="2005 John Wiley & Sons">
  <meta name="Author" content="Kurt Schmidt">
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<h2><font color='#009999'>27.7 Painting (cont.)</font></h2>
<ul>
  <li><font size="+1">The paint function obtains a <i>device context</i>, which 
    is an object that represents the surface of the window.</font></li>
  <li><font size="+1">The device context class has drawing functions such as <tt>DrawLine</tt>, 
    <tt>DrawEllipse</tt>, and <tt>DrawText</tt>.
	<blockquote>
      <pre>void EllipseWindow::OnPaint(wxPaintEvent&amp; event)
{
   wxPaintDC dc(this);
   dc.SetBrush(*wxTRANSPARENT_BRUSH);
   wxSize size = GetSize();
   int x = 0;
   int y = 0;
   int width = size.GetWidth();
   int height = size.GetHeight();
   dc.DrawEllipse(x, y, width, height);
}</pre>
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