/*
 *  acm : an aerial combat simulator for X
 *  Copyright (C) 1991,1992  Riley Rainey
 *
 *  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; version 2 dated June, 1991.
 *
 *  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.
 */

typedef unsigned short freq_t;

typedef struct _navaid_t {
	struct _navaid_t *next;		/* links navaids on the same channel */
	char      id[4];			/* identifier (e.g. "IHNL") */
	freq_t    frequency;		/* channel number */
	double    magvar;			/* converts True to Magnetic (rad) */
	unsigned short flags;
	WorldCoordinates loc;		/* lat/long/altitude */
	VPoint    Sg;				/* geocentric location */
	WorldCoordinates gs_loc;	/* lat/long/altitude of glide-slope */
	double    bearing;			/* geodetic azimuth of loc bearing */
	double    beam_width;		/* beam width for localizers (rad) */
	/*see navaid.c on how to calculate it */
	double    slope;			/* angle of glide slope (rad) */
	VMatrix   lt;				/* transform geocentric to loc local coordinates */
	VMatrix   gst;				/* transform geocentric to gs local coordinates */
} navaid_t;

typedef struct {
	freq_t    frequency;		/* active frequency */
	freq_t    standby_frequency;	/* alternate frequency */
	short     obs_setting;		/* omni bearing selector setting */
	char      dme_readout[16];	/* Current DME reading */
	char      freq_readout[8];	/* current printable freq */
	navaid_t *station;			/* station being received */
} radio_t;

#define VOR_CHANNEL_COUNT	200

/*
 *  Definition of the navaid flag word
 */

#define NAVAID_LOC	0x0001
#define NAVAID_VOR	0x0002
#define NAVAID_DME	0x0004
#define NAVAID_GS	0x0008
#define NAVAID_OMARKER	0x0010
#define NAVAID_MMARKER	0x0020
#define NAVAID_NDB	0x0040