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+//
+//  Written by David Megginson, started January 2000.
+//  Adopted for standalone fgpanel application by Torsten Dreyer, August 2009
+//
+//  This program 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.
+//
+//  This program 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 this program; if not, write to the Free Software
+//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+
+#pragma once
+
+#include <vector>
+#include <simgear/props/condition.hxx>
+
+#include "FGPanelTransformation.hxx"
+
+
+/**
+ * A single layer of a multi-layered instrument.
+ *
+ * Each layer can be subject to a series of transformations based
+ * on current FGFS instrument readings: for example, a texture
+ * representing a needle can rotate to show the airspeed.
+ */
+class FGInstrumentLayer : public SGConditional {
+public:
+  FGInstrumentLayer (const int w = -1, const int h = -1);
+  virtual ~FGInstrumentLayer ();
+
+  virtual void draw () = 0;
+  virtual void transform () const;
+
+  virtual int getWidth () const;
+  virtual int getHeight () const;
+  virtual void setWidth (const int w);
+  virtual void setHeight (const int h);
+
+  // Transfer pointer ownership!!
+  // DEPRECATED
+  virtual void addTransformation (FGPanelTransformation * const transformation);
+
+protected:
+  int m_w, m_h;
+
+  typedef std::vector <FGPanelTransformation *> transformation_list;
+  transformation_list m_transformations;
+};