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Painting

• The paint function obtains a device context, which is an object that represents the surface of the window.
• The device context class has drawing functions such as DrawLine, DrawEllipse, and DrawText.

  void EllipseWindow::OnPaint(wxPaintEvent& 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);
  }
  

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