120 lines
3.6 KiB
C++
120 lines
3.6 KiB
C++
// flight.c -- a general interface to the various flight models
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//
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// Written by Curtis Olson, started May 1997.
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//
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// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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#include <stdio.h>
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#include <simgear/constants.h>
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#include <simgear/debug/logstream.hxx>
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#include <simgear/math/fg_geodesy.hxx>
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#include <FDM/LaRCsim/ls_interface.h>
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#include <Main/options.hxx>
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#include <Time/timestamp.hxx>
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#include "External.hxx"
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#include "flight.hxx"
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#include "JSBSim.hxx"
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#include "LaRCsim.hxx"
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#include "Balloon.h"
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// base_fdm_state is the internal state that is updated in integer
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// multiples of "dt". This leads to "jitter" with respect to the real
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// world time, so we introduce cur_fdm_state which is extrapolated by
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// the difference between sim time and real world time
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FGInterface *cur_fdm_state;
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FGInterface base_fdm_state;
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int FGInterface::init( double dt ) {
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cout << "dummy init() ... SHOULDN'T BE CALLED!" << endl;
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return 0;
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}
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int FGInterface::update( int multi_loop ) {
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cout << "dummy update() ... SHOULDN'T BE CALLED!" << endl;
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return 0;
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}
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FGInterface::~FGInterface() {
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}
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// Extrapolate fdm based on time_offset (in usec)
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void FGInterface::extrapolate( int time_offset ) {
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double dt = time_offset / 1000000.0;
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// -dw- metrowerks complains about ambiguous access, not critical
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// to keep this ;)
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#ifndef __MWERKS__
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cout << "extrapolating FDM by dt = " << dt << endl;
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#endif
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double lat = geodetic_position_v[0] + geocentric_rates_v[0] * dt;
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double lat_geoc = geocentric_position_v[0] + geocentric_rates_v[0] * dt;
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double lon = geodetic_position_v[1] + geocentric_rates_v[1] * dt;
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double lon_geoc = geocentric_position_v[1] + geocentric_rates_v[1] * dt;
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double alt = geodetic_position_v[2] + geocentric_rates_v[2] * dt;
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double radius = geocentric_position_v[2] + geocentric_rates_v[2] * dt;
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geodetic_position_v[0] = lat;
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geocentric_position_v[0] = lat_geoc;
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geodetic_position_v[1] = lon;
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geocentric_position_v[1] = lon_geoc;
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geodetic_position_v[2] = alt;
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geocentric_position_v[2] = radius;
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}
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// Set the altitude (force)
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void fgFDMForceAltitude(int model, double alt_meters) {
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double sea_level_radius_meters;
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double lat_geoc;
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// Set the FG variables first
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fgGeodToGeoc( base_fdm_state.get_Latitude(), alt_meters,
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&sea_level_radius_meters, &lat_geoc);
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base_fdm_state.set_Altitude( alt_meters * METER_TO_FEET );
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base_fdm_state.set_Radius_to_vehicle( base_fdm_state.get_Altitude() +
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(sea_level_radius_meters *
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METER_TO_FEET) );
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// additional work needed for some flight models
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if ( model == FGInterface::FG_LARCSIM ) {
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ls_ForceAltitude( base_fdm_state.get_Altitude() );
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}
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}
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// Set the local ground elevation
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void fgFDMSetGroundElevation(int model, double ground_meters) {
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base_fdm_state.set_Runway_altitude( ground_meters * METER_TO_FEET );
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cur_fdm_state->set_Runway_altitude( ground_meters * METER_TO_FEET );
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}
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