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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 <string>
+#include <simgear/timing/timestamp.hxx>
+
+#include "FGFontCache.hxx"
+#include "FGInstrumentLayer.hxx"
+
+
+/**
+ * A text layer of an instrument.
+ *
+ * This is a layer holding a string of static and/or generated text.
+ * It is useful for instruments that have text displays, such as
+ * a chronometer, GPS, or NavCom radio.
+ */
+
+class FGTextLayer : public FGInstrumentLayer {
+public:
+  enum ChunkType {
+    TEXT,
+    TEXT_VALUE,
+    DOUBLE_VALUE
+  };
+
+  class Chunk : public SGConditional {
+  public:
+    Chunk (const std::string &text,
+           const std::string &fmt = "%s");
+    Chunk (const ChunkType type,
+           const SGPropertyNode *node,
+           const std::string &fmt = "",
+           const float mult = 1.0,
+           const float offs = 0.0,
+           const bool truncation = false);
+
+    const char *getValue () const;
+  private:
+    ChunkType m_type;
+    std::string m_text;
+    SGConstPropertyNode_ptr m_node;
+    std::string m_fmt;
+    float m_mult;
+    float m_offs;
+    bool m_trunc;
+    mutable char m_buf[1024];
+
+  };
+
+  static bool Init ();
+
+  FGTextLayer (const int w = -1, const int h = -1);
+  virtual ~FGTextLayer ();
+
+  virtual void draw ();
+
+  // Transfer pointer!!
+  virtual void addChunk (Chunk * const chunk);
+  virtual void setColor (const float r,
+                         const float g,
+                         const float b);
+  virtual void setPointSize (const float size);
+  virtual void setFontName (const std::string &name);
+
+private:
+
+  void recalc_value () const;
+
+  typedef std::vector<Chunk *> chunk_list;
+  chunk_list m_chunks;
+  float m_color[4];
+
+  float m_pointSize;
+  static SGPath The_Font_Path;
+  mutable std::string m_font_name;
+  mutable std::string m_value;
+  mutable SGTimeStamp m_then;
+  mutable SGTimeStamp m_now;
+
+  static FGFontCache The_Font_Cache;
+
+  static GLuint Text_Layer_Program_Object;
+  static GLint Text_Layer_Position_Loc;
+  static GLint Text_Layer_Tex_Coord_Loc;
+  static GLint Text_Layer_MVP_Loc;
+  static GLint Text_Layer_Sampler_Loc;
+  static GLint Text_Layer_Color_Loc;
+};