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+// opengc_data.hxx -- Define structure of OpenGC/FG uint32_terface parameters
+//
+//  Version by J. Wojnaroski for uint32_terface to Open Glass Displays
+//
+//  Modified 02/12/01 - Update engine structure for multi-engine models
+//		          - Added data preamble to id msg types
+//
+//  Modified 01/23/02 - Converted portions of the Engine and Gear accesssors to properties
+//			    - Removed data from navigation functions. OpenGC provides own
+//
+// This file defines the class/structure of the UDP packet that sends
+// the simulation data created by FlightGear to the glass displays. It
+// is required to "sync" the data types contained in the packet
+//
+// 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.
+//
+
+#ifndef _OPENGC_DATA_HXX
+#define _OPENGC_DATA_HXX
+
+#ifndef __cplusplus
+# error This library requires C++
+#endif
+
+const uint32_t OGC_VERSION = 4;
+typedef unsigned int  uint32_t;
+
+class ogcFGData {
+
+public:
+
+    // defines msg types and contents. The msg_content is used as a 'pouint32_ter' to
+    // a predefined set of msg strings
+ 
+    uint32_t	version_id;
+    uint32_t	msg_type;
+    uint32_t	msg_content;
+    uint32_t  reserved;
+
+    // position
+
+    double	latitude;
+    double	longitude;
+    double	elevation;
+    double	magvar;
+
+    // flight parameters
+	
+    double	pitch;
+    double	bank;
+    double	heading;
+    double	altitude;
+    double	altitude_agl;  // this can also be the radar altimeter
+    double  v_kcas;
+    double	groundspeed;
+    double	vvi;
+    double  mach;
+    double	v_keas;  // equivalent airspeed in knots
+
+  // Data used by the FMC and autopilots
+
+    double	phi_dot;
+    double	theta_dot;
+    double	psi_dot;
+
+    double	alpha;
+    double	alpha_dot;
+    double	beta;
+    double	beta_dot;
+
+  // Control surface positions
+
+    double	left_aileron;
+    double  right_aileron;
+    double	aileron_trim;
+    double	elevator;
+    double	elevator_trim;
+    double	rudder;
+    double	rudder_trim;
+    double	flaps;
+    double  flaps_cmd;
+
+  // gear positions 0 = up and 1 = down  The 747 has 5 wheel bogey assemblies
+
+    double	gear_nose;
+    double	gear_left;
+    double	gear_right;
+    double  gear_left_rear;
+    double  gear_right_rear;
+    double	parking_brake;
+    uint32_t		wow_main;  // logical and of main gear
+		uint32_t		wow_nose;	
+    // engine data
+
+    double	rpm[4];  // this is for pistons, jets see below
+    double	n1_turbine[4];
+    double	epr[4];
+    double	egt[4];
+    double  n2_turbine[4];
+    double	fuel_flow[4];
+    double  man_pressure[4];
+    double	oil_pressure[4];
+    double	oil_temp[4];
+    double	oil_quantity[4];
+    double	hyd_pressure[4];
+    double	throttle[4];
+    double	mixture[4];
+    double	prop_advance[4];
+    
+    // fuel system
+    uint32_t num_tanks;
+    double fuel_tank[9];
+     
+    // Pressures and temperatures
+
+    double	static_temperature;
+    double	total_temperature;
+    double	static_pressure;
+    double	total_pressure;
+    double	dynamic_pressure;
+    
+    // more environmental data
+		double wind;
+		double wind_dir;
+		double sea_level_pressure;
+		
+};
+
+#endif // _OPENGC_HXX