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diff --git a/graphics/epix/active_screen.cc b/graphics/epix/active_screen.cc
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+/* 
+ * active_screen.cc -- ePiX screen_broker class
+ *
+ * This file is part of ePiX, a C++ library for creating high-quality 
+ * figures in LaTeX 
+ *
+ * Version 1.1.11
+ * Last Change: August 15, 2007
+ */
+
+/* 
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ * Andrew D. Hwang <rot 13 nujnat at zngupf dot ubylpebff dot rqh>
+ * Department of Mathematics and Computer Science
+ * College of the Holy Cross
+ * Worcester, MA, 01610-2395, USA
+ */
+
+/*
+ * ePiX is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * ePiX is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ePiX; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include "screen.h"
+#include "picture_data.h"
+#include "picture.h"
+#include "active_screen.h"
+
+namespace ePiX {
+
+  screen_broker::screen_broker()
+  {
+    m_screens.push_front(&the_picture().the_canvas);
+  }
+
+  screen* screen_broker::active() const
+  {
+    return *(m_screens.begin());
+  }
+
+  void screen_broker::push(screen& scr)
+  {
+    m_screens.push_front(&scr);
+  }
+
+  screen* screen_broker::pop()
+  {
+    std::list<screen*>::const_iterator sp(m_screens.begin());
+
+    screen* val(*sp);
+
+    if (++sp != m_screens.end())
+      m_screens.pop_front();
+
+    return val;
+  }
+
+
+  // global functions
+  screen_broker& the_screen_stack()
+  {
+    static screen_broker* the_screen_broker(new screen_broker());
+    return *the_screen_broker;
+  }
+
+  screen* active_screen()
+  {
+    return the_screen_stack().active();
+  }
+} // end of namespace