title: C++ fill color in shapes using FLTK doesn't work for circles
body: <p>I installed FLTK 1.3.X from fltk.org on my visual studio 2012 compiler and use PPP book for C++ programming (<a href="http://www.stroustrup.com/Programming/PPP1.html" rel="nofollow">this</a>).
  My problem is about filling a Shape in. For example please observe this code:</p>
  
  <pre><code>#include &lt;Simple_window.h&gt;
  
  using namespace Graph_lib;
  int main()
  {
      Simple_window win(Point(100,100), 1000, 600, "Binary_tree");
      Graph_lib::Circle c(Point(200,200),50);
      c.set_color(Color::red);
      c.set_fill_color(Color::blue);
      Graph_lib::Ellipse e(Point(100,100),50,30);
      e.set_color(Color::blue);
      e.set_fill_color(Color::red);
      Graph_lib::Rectangle r(Point(250,200),Point(350,300));
      r.set_color(Color::green);
      r.set_fill_color(Color::red);
      win.attach(r);
      win.attach(e);
      win.attach(c);
      win.wait_for_button();
  }
  </code></pre>
  
  <p>When I run the program, All three <code>Shapes</code> are drawn on window but only the <code>Rectangle</code> is filled in!
  Why?
  <code>set_color</code> works for the three and apparently the <code>set_fill_color</code> is defined for all <code>Shapes</code> and it too should work but why it doesn't for <code>Circle</code> and <code>Ellipse</code>? </p>
  
  <p><a href="http://www.stroustrup.com/Programming/Graphics/" rel="nofollow">This</a> is the <code>.CPP</code> and <code>.h</code> files ( )</p>