From dfd36a1f5fddd520121fc387c558d09c9319ff5f Mon Sep 17 00:00:00 2001
From: curt <curt>
Date: Fri, 4 Dec 1998 01:28:48 +0000
Subject: [PATCH] Initial revision.

---
 External/Makefile.am  |   5 +++
 External/external.cxx |  48 ++++++++++++++++++++
 External/external.hxx | 101 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 154 insertions(+)
 create mode 100644 External/Makefile.am
 create mode 100644 External/external.cxx
 create mode 100644 External/external.hxx

diff --git a/External/Makefile.am b/External/Makefile.am
new file mode 100644
index 000000000..54f3b28f9
--- /dev/null
+++ b/External/Makefile.am
@@ -0,0 +1,5 @@
+noinst_LIBRARIES = libExternal.a
+
+libExternal_a_SOURCES = external.cxx external.hxx
+
+INCLUDES += -I$(top_builddir) -I$(top_builddir)/Simulator
diff --git a/External/external.cxx b/External/external.cxx
new file mode 100644
index 000000000..1352740c1
--- /dev/null
+++ b/External/external.cxx
@@ -0,0 +1,48 @@
+// slew.cxx -- the "slew" flight model
+//
+// Written by Curtis Olson, started May 1997.
+//
+// Copyright (C) 1997  Curtis L. Olson  - curt@infoplane.com
+//
+// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+// $Id$
+// (Log is kept at end of this file)
+
+
+#include <math.h>
+
+#include "external.hxx"
+
+#include <Flight/flight.hxx>
+#include <Include/fg_constants.h>
+
+
+// reset flight params to a specific position
+void fgExternalInit(fgFLIGHT &f, double dt) {
+
+}
+
+
+// update position based on inputs, positions, velocities, etc.
+void fgExternalUpdate( fgFLIGHT& f, int multiloop ) {
+
+}
+
+
+// $Log$
+// Revision 1.1  1998/12/04 01:28:49  curt
+// Initial revision.
+//
diff --git a/External/external.hxx b/External/external.hxx
new file mode 100644
index 000000000..80feabf13
--- /dev/null
+++ b/External/external.hxx
@@ -0,0 +1,101 @@
+// external.hxx -- the "external" flight model (driven from other
+//                 external input)
+//
+// Written by Curtis Olson, started December 1998.
+//
+// Copyright (C) 1998  Curtis L. Olson  - curt@flightgear.org
+//
+// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+// $Id$
+// (Log is kept at end of this file)
+
+
+#ifndef _EXTERNAL_HXX
+#define _EXTERNAL_HXX
+
+
+#ifndef __cplusplus                                                          
+# error This library requires C++
+#endif                                   
+
+
+#include <Time/fg_time.hxx>
+
+
+class fgFDM_EXTERNAL {
+
+public:
+
+    // Time Stamp
+
+    // The time at which these values are correct (for extrapolating
+    // later frames between position updates)
+    fgTIMESTAMP t;
+
+    // Positions
+
+    // placement in geodetic coordinates
+    double Latitude;
+    double Longitude;
+    double Altitude;
+
+    // orientation in euler angles relative to local frame (or ground
+    // position)
+    double Phi;       // roll
+    double Theta;     // pitch
+    double Psi;       // heading
+
+    // Velocities
+
+    // velocity relative to the local aircraft's coordinate system
+    double V_north;
+    double V_east;
+    double V_down;
+
+    // rotational rates relative to the coordinate system the body lives in
+    double P_body;
+    double Q_body;
+    double R_body;
+
+    // Accelerations
+    
+    // acceleration relative to the local aircraft's coordinate system
+    double V_dot_north;
+    double V_dot_east;
+    double V_dot_down;
+
+    // rotational acceleration relative to the coordinate system the
+    // body lives in
+    double P_dot_body;
+    double Q_dot_body;
+    double R_dot_body;
+};
+
+
+// reset flight params to a specific position 
+void fgExternalInit(fgFLIGHT& f, double dt);
+
+// update position based on inputs, positions, velocities, etc.
+void fgExternalUpdate( fgFLIGHT& f, int multiloop );
+
+
+#endif // _EXTERNAL_HXX
+
+
+// $Log$
+// Revision 1.1  1998/12/04 01:28:49  curt
+// Initial revision.
+//
-- 
2.39.5