99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
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/**************************************************************************
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* slew.c -- the "slew" flight model
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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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* (Log is kept at end of this file)
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**************************************************************************/
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#include <math.h>
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#include "slew.h"
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#include "../flight.h"
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#include "../../aircraft/aircraft.h"
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#include "../../controls/controls.h"
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#ifndef PI2
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#define PI2 (M_PI + M_PI)
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#endif
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/* reset flight params to a specific position */
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void fgSlewInit(double pos_x, double pos_y, double pos_z, double heading) {
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struct flight_params *f;
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f = ¤t_aircraft.flight;
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f->pos_x = pos_x;
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f->pos_y = pos_y;
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f->pos_z = pos_z;
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f->vel_x = 0.0;
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f->vel_y = 0.0;
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f->vel_z = 0.0;
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f->Phi = 0.0;
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f->Theta = 0.0;
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f->Psi = 0.0;
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f->vel_Phi = 0.0;
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f->vel_Theta = 0.0;
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f->vel_Psi = 0.0;
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f->Psi = heading;
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}
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/* update position based on inputs, positions, velocities, etc. */
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void fgSlewUpdate() {
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struct flight_params *f;
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struct control_params *c;
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f = ¤t_aircraft.flight;
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c = ¤t_aircraft.controls;
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f->Psi += c->aileron;
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if ( f->Psi > PI2 ) {
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f->Psi -= PI2;
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} else if ( f->Psi < 0 ) {
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f->Psi += PI2;
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}
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f->vel_x = -c->elev;
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f->pos_x = f->pos_x + (cos(f->Psi) * f->vel_x);
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f->pos_y = f->pos_y + (sin(f->Psi) * f->vel_x);
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}
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/* $Log$
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/* Revision 1.1 1997/05/29 02:29:42 curt
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/* Moved to their own directory.
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/*
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* Revision 1.2 1997/05/23 15:40:37 curt
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* Added GNU copyright headers.
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*
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* Revision 1.1 1997/05/16 16:04:45 curt
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* Initial revision.
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*
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*/
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