[unix-history] / usr / src / games / trek / phaser.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)phaser.c	5.1 (Berkeley) %G%";
#endif not lint

# include	"trek.h"
# include	"getpar.h"

/* factors for phaser hits; see description below */

# define	ALPHA		3.0		/* spread */
# define	BETA		3.0		/* franf() */
# define	GAMMA		0.30		/* cos(angle) */
# define	EPSILON		150.0		/* dist ** 2 */
# define	OMEGA		10.596		/* overall scaling factor */

/* OMEGA ~= 100 * (ALPHA + 1) * (BETA + 1) / (EPSILON + 1) */

/*
**  Phaser Control
**
**	There are up to NBANKS phaser banks which may be fired
**	simultaneously.  There are two modes, "manual" and
**	"automatic".  In manual mode, you specify exactly which
**	direction you want each bank to be aimed, the number
**	of units to fire, and the spread angle.  In automatic
**	mode, you give only the total number of units to fire.
**
**	The spread is specified as a number between zero and
**	one, with zero being minimum spread and one being maximum
**	spread.  You  will normally want zero spread, unless your
**	short range scanners are out, in which case you probably
**	don't know exactly where the Klingons are.  In that case,
**	you really don't have any choice except to specify a
**	fairly large spread.
**
**	Phasers spread slightly, even if you specify zero spread.
**
**	Uses trace flag 30
*/

struct cvntab	Matab[] =
{
	"m",		"anual",		(int (*)())1,		0,
	"a",		"utomatic",		0,		0,
	0
};

struct banks
{
	int	units;
	double	angle;
	double	spread;
};


phaser()
{
	register int		i;
	int			j;
	register struct kling	*k;
	double			dx, dy;
	double			anglefactor, distfactor;
	register struct banks	*b;
	int			manual, flag, extra;
	int			hit;
	double			tot;
	int			n;
	int			hitreqd[NBANKS];
	struct banks		bank[NBANKS];
	struct cvntab		*ptr;

	if (Ship.cond == DOCKED)
		return(printf("Phasers cannot fire through starbase shields\n"));
	if (damaged(PHASER))
		return (out(PHASER));
	if (Ship.shldup)
		return (printf("Sulu: Captain, we cannot fire through shields.\n"));
	if (Ship.cloaked)
	{
		printf("Sulu: Captain, surely you must realize that we cannot fire\n");
		printf("  phasers with the cloaking device up.\n");
		return;
	}

	/* decide if we want manual or automatic mode */
	manual = 0;
	if (testnl())
	{
		if (damaged(COMPUTER))
		{
			printf(Device[COMPUTER].name);
			manual++;
		}
		else
			if (damaged(SRSCAN))
			{
				printf(Device[SRSCAN].name);
				manual++;
			}
		if (manual)
			printf(" damaged, manual mode selected\n");
	}

	if (!manual)
	{
		ptr = getcodpar("Manual or automatic", Matab);
		manual = (int) ptr->value;
	}
	if (!manual && damaged(COMPUTER))
	{
		printf("Computer damaged, manual selected\n");
		skiptonl(0);
		manual++;
	}

	/* initialize the bank[] array */
	flag = 1;
	for (i = 0; i < NBANKS; i++)
		bank[i].units = 0;
	if (manual)
	{
		/* collect manual mode statistics */
		while (flag)
		{
			printf("%d units available\n", Ship.energy);
			extra = 0;
			flag = 0;
			for (i = 0; i < NBANKS; i++)
			{
				b = &bank[i];
				printf("\nBank %d:\n", i);
				hit = getintpar("units");
				if (hit < 0)
					return;
				if (hit == 0)
					break;
				extra += hit;
				if (extra > Ship.energy)
				{
					printf("available energy exceeded.  ");
					skiptonl(0);
					flag++;
					break;
				}
				b->units = hit;
				hit = getintpar("course");
				if (hit < 0 || hit > 360)
					return;
				b->angle = hit * 0.0174532925;
				b->spread = getfltpar("spread");
				if (b->spread < 0 || b->spread > 1)
					return;
			}
			Ship.energy -= extra;
		}
		extra = 0;
	}
	else
	{
		/* automatic distribution of power */
		if (Etc.nkling <= 0)
			return (printf("Sulu: But there are no Klingons in this quadrant\n"));
		printf("Phasers locked on target.  ");
		while (flag)
		{
			printf("%d units available\n", Ship.energy);
			hit = getintpar("Units to fire");
			if (hit <= 0)
				return;
			if (hit > Ship.energy)
			{
				printf("available energy exceeded.  ");
				skiptonl(0);
				continue;
			}
			flag = 0;
			Ship.energy -= hit;
			extra = hit;
			n = Etc.nkling;
			if (n > NBANKS)
				n = NBANKS;
			tot = n * (n + 1) / 2;
			for (i = 0; i < n; i++)
			{
				k = &Etc.klingon[i];
				b = &bank[i];
				distfactor = k->dist;
				anglefactor = ALPHA * BETA * OMEGA / (distfactor * distfactor + EPSILON);
				anglefactor *= GAMMA;
				distfactor = k->power;
				distfactor /= anglefactor;
				hitreqd[i] = distfactor + 0.5;
				dx = Ship.sectx - k->x;
				dy = k->y - Ship.secty;
				b->angle = atan2(dy, dx);
				b->spread = 0.0;
				b->units = ((n - i) / tot) * extra;
#				ifdef xTRACE
				if (Trace)
				{
					printf("b%d hr%d u%d df%.2f af%.2f\n",
						i, hitreqd[i], b->units,
						distfactor, anglefactor);
				}
#				endif
				extra -= b->units;
				hit = b->units - hitreqd[i];
				if (hit > 0)
				{
					extra += hit;
					b->units -= hit;
				}
			}

			/* give out any extra energy we might have around */
			if (extra > 0)
			{
				for (i = 0; i < n; i++)
				{
					b = &bank[i];
					hit = hitreqd[i] - b->units;
					if (hit <= 0)
						continue;
					if (hit >= extra)
					{
						b->units += extra;
						extra = 0;
						break;
					}
					b->units = hitreqd[i];
					extra -= hit;
				}
				if (extra > 0)
					printf("%d units overkill\n", extra);
			}
		}
	}

#	ifdef xTRACE
	if (Trace)
	{
		for (i = 0; i < NBANKS; i++)
		{
			b = &bank[i];
			printf("b%d u%d", i, b->units);
			if (b->units > 0)
				printf(" a%.2f s%.2f\n", b->angle, b->spread);
			else
				printf("\n");
		}
	}
#	endif

	/* actually fire the shots */
	Move.free = 0;
	for (i = 0; i < NBANKS; i++)
	{
		b = &bank[i];
		if (b->units <= 0)
		{
			continue;
		}
		printf("\nPhaser bank %d fires:\n", i);
		n = Etc.nkling;
		k = Etc.klingon;
		for (j = 0; j < n; j++)
		{
			if (b->units <= 0)
				break;
			/*
			** The formula for hit is as follows:
			**
			**  zap = OMEGA * [(sigma + ALPHA) * (rho + BETA)]
			**	/ (dist ** 2 + EPSILON)]
			**	* [cos(delta * sigma) + GAMMA]
			**	* hit
			**
			** where sigma is the spread factor,
			** rho is a random number (0 -> 1),
			** GAMMA is a crud factor for angle (essentially
			**	cruds up the spread factor),
			** delta is the difference in radians between the
			**	angle you are shooting at and the actual
			**	angle of the klingon,
			** ALPHA scales down the significance of sigma,
			** BETA scales down the significance of rho,
			** OMEGA is the magic number which makes everything
			**	up to "* hit" between zero and one,
			** dist is the distance to the klingon
			** hit is the number of units in the bank, and
			** zap is the amount of the actual hit.
			**
			** Everything up through dist squared should maximize
			** at 1.0, so that the distance factor is never
			** greater than one.  Conveniently, cos() is
			** never greater than one, but the same restric-
			** tion applies.
			*/
			distfactor = BETA + franf();
			distfactor *= ALPHA + b->spread;
			distfactor *= OMEGA;
			anglefactor = k->dist;
			distfactor /= anglefactor * anglefactor + EPSILON;
			distfactor *= b->units;
			dx = Ship.sectx - k->x;
			dy = k->y - Ship.secty;
			anglefactor = atan2(dy, dx) - b->angle;
			anglefactor = cos((anglefactor * b->spread) + GAMMA);
			if (anglefactor < 0.0)
			{
				k++;
				continue;
			}
			hit = anglefactor * distfactor + 0.5;
			k->power -= hit;
			printf("%d unit hit on Klingon", hit);
			if (!damaged(SRSCAN))
				printf(" at %d,%d", k->x, k->y);
			printf("\n");
			b->units -= hit;
			if (k->power <= 0)
			{
				killk(k->x, k->y);
				continue;
			}
			k++;
		}
	}

	/* compute overkill */
	for (i = 0; i < NBANKS; i++)
		extra += bank[i].units;
	if (extra > 0)
		printf("\n%d units expended on empty space\n", extra);
}
Commit	Line	Data
9758240b KM	1	/*
	2	* Copyright (c) 1980 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*/
	6
c7124754	7	#ifndef lint
9758240b	8	static char sccsid[] = "@(#)phaser.c 5.1 (Berkeley) %G%";
c7124754 KM	9	#endif not lint
	10
	11	# include "trek.h"
	12	# include "getpar.h"
	13
	14	/* factors for phaser hits; see description below */
	15
	16	# define ALPHA 3.0 /* spread */
	17	# define BETA 3.0 /* franf() */
	18	# define GAMMA 0.30 /* cos(angle) */
	19	# define EPSILON 150.0 /* dist ** 2 */
	20	# define OMEGA 10.596 /* overall scaling factor */
	21
	22	/* OMEGA ~= 100 * (ALPHA + 1) * (BETA + 1) / (EPSILON + 1) */
	23
	24	/*
	25	** Phaser Control
	26	**
	27	** There are up to NBANKS phaser banks which may be fired
	28	** simultaneously. There are two modes, "manual" and
	29	** "automatic". In manual mode, you specify exactly which
	30	** direction you want each bank to be aimed, the number
	31	** of units to fire, and the spread angle. In automatic
	32	** mode, you give only the total number of units to fire.
	33	**
	34	** The spread is specified as a number between zero and
	35	** one, with zero being minimum spread and one being maximum
	36	** spread. You will normally want zero spread, unless your
	37	** short range scanners are out, in which case you probably
	38	** don't know exactly where the Klingons are. In that case,
	39	** you really don't have any choice except to specify a
	40	** fairly large spread.
	41	**
	42	** Phasers spread slightly, even if you specify zero spread.
	43	**
	44	** Uses trace flag 30
	45	*/
	46
401a08c7	47	struct cvntab Matab[] =
c7124754	48	{
401a08c7	49	"m", "anual", (int (*)())1, 0,
c7124754 KM	50	"a", "utomatic", 0, 0,
	51	0
	52	};
	53
	54	struct banks
	55	{
	56	int units;
401a08c7 KL	57	double angle;
401a08c7 KL	58	double spread;
c7124754 KM	59	};
	60
	61
	62
	63	phaser()
	64	{
	65	register int i;
	66	int j;
	67	register struct kling *k;
	68	double dx, dy;
	69	double anglefactor, distfactor;
	70	register struct banks *b;
	71	int manual, flag, extra;
	72	int hit;
	73	double tot;
	74	int n;
	75	int hitreqd[NBANKS];
	76	struct banks bank[NBANKS];
	77	struct cvntab *ptr;
	78
	79	if (Ship.cond == DOCKED)
	80	return(printf("Phasers cannot fire through starbase shields\n"));
	81	if (damaged(PHASER))
	82	return (out(PHASER));
	83	if (Ship.shldup)
	84	return (printf("Sulu: Captain, we cannot fire through shields.\n"));
	85	if (Ship.cloaked)
	86	{
	87	printf("Sulu: Captain, surely you must realize that we cannot fire\n");
	88	printf(" phasers with the cloaking device up.\n");
	89	return;
	90	}
	91
	92	/* decide if we want manual or automatic mode */
	93	manual = 0;
	94	if (testnl())
	95	{
	96	if (damaged(COMPUTER))
	97	{
	98	printf(Device[COMPUTER].name);
	99	manual++;
	100	}
	101	else
	102	if (damaged(SRSCAN))
	103	{
	104	printf(Device[SRSCAN].name);
	105	manual++;
	106	}
	107	if (manual)
	108	printf(" damaged, manual mode selected\n");
	109	}
	110
	111	if (!manual)
	112	{
	113	ptr = getcodpar("Manual or automatic", Matab);
401a08c7	114	manual = (int) ptr->value;
c7124754 KM	115	}
	116	if (!manual && damaged(COMPUTER))
	117	{
	118	printf("Computer damaged, manual selected\n");
	119	skiptonl(0);
	120	manual++;
	121	}
	122
	123	/* initialize the bank[] array */
	124	flag = 1;
	125	for (i = 0; i < NBANKS; i++)
	126	bank[i].units = 0;
	127	if (manual)
	128	{
	129	/* collect manual mode statistics */
	130	while (flag)
	131	{
	132	printf("%d units available\n", Ship.energy);
	133	extra = 0;
	134	flag = 0;
	135	for (i = 0; i < NBANKS; i++)
	136	{
	137	b = &bank[i];
	138	printf("\nBank %d:\n", i);
	139	hit = getintpar("units");
	140	if (hit < 0)
	141	return;
	142	if (hit == 0)
	143	break;
401a08c7	144	extra += hit;
c7124754 KM	145	if (extra > Ship.energy)
	146	{
	147	printf("available energy exceeded. ");
	148	skiptonl(0);
	149	flag++;
	150	break;
	151	}
	152	b->units = hit;
	153	hit = getintpar("course");
	154	if (hit < 0 \|\| hit > 360)
	155	return;
	156	b->angle = hit * 0.0174532925;
	157	b->spread = getfltpar("spread");
	158	if (b->spread < 0 \|\| b->spread > 1)
	159	return;
	160	}
401a08c7	161	Ship.energy -= extra;
c7124754 KM	162	}
	163	extra = 0;
	164	}
	165	else
	166	{
	167	/* automatic distribution of power */
	168	if (Etc.nkling <= 0)
	169	return (printf("Sulu: But there are no Klingons in this quadrant\n"));
	170	printf("Phasers locked on target. ");
	171	while (flag)
	172	{
	173	printf("%d units available\n", Ship.energy);
	174	hit = getintpar("Units to fire");
	175	if (hit <= 0)
	176	return;
	177	if (hit > Ship.energy)
	178	{
	179	printf("available energy exceeded. ");
	180	skiptonl(0);
	181	continue;
	182	}
	183	flag = 0;
401a08c7	184	Ship.energy -= hit;
c7124754 KM	185	extra = hit;
	186	n = Etc.nkling;
	187	if (n > NBANKS)
	188	n = NBANKS;
	189	tot = n * (n + 1) / 2;
	190	for (i = 0; i < n; i++)
	191	{
	192	k = &Etc.klingon[i];
	193	b = &bank[i];
	194	distfactor = k->dist;
	195	anglefactor = ALPHA * BETA * OMEGA / (distfactor * distfactor + EPSILON);
401a08c7	196	anglefactor *= GAMMA;
c7124754	197	distfactor = k->power;
401a08c7	198	distfactor /= anglefactor;
c7124754 KM	199	hitreqd[i] = distfactor + 0.5;
	200	dx = Ship.sectx - k->x;
	201	dy = k->y - Ship.secty;
	202	b->angle = atan2(dy, dx);
	203	b->spread = 0.0;
	204	b->units = ((n - i) / tot) * extra;
	205	# ifdef xTRACE
	206	if (Trace)
	207	{
	208	printf("b%d hr%d u%d df%.2f af%.2f\n",
	209	i, hitreqd[i], b->units,
	210	distfactor, anglefactor);
	211	}
	212	# endif
401a08c7	213	extra -= b->units;
c7124754 KM	214	hit = b->units - hitreqd[i];
	215	if (hit > 0)
	216	{
401a08c7 KL	217	extra += hit;
401a08c7 KL	218	b->units -= hit;
c7124754 KM	219	}
	220	}
	221
	222	/* give out any extra energy we might have around */
	223	if (extra > 0)
	224	{
	225	for (i = 0; i < n; i++)
	226	{
	227	b = &bank[i];
	228	hit = hitreqd[i] - b->units;
	229	if (hit <= 0)
	230	continue;
	231	if (hit >= extra)
	232	{
401a08c7	233	b->units += extra;
c7124754 KM	234	extra = 0;
	235	break;
	236	}
	237	b->units = hitreqd[i];
401a08c7	238	extra -= hit;
c7124754 KM	239	}
	240	if (extra > 0)
	241	printf("%d units overkill\n", extra);
	242	}
	243	}
	244	}
	245
	246	# ifdef xTRACE
	247	if (Trace)
	248	{
	249	for (i = 0; i < NBANKS; i++)
	250	{
	251	b = &bank[i];
	252	printf("b%d u%d", i, b->units);
	253	if (b->units > 0)
	254	printf(" a%.2f s%.2f\n", b->angle, b->spread);
	255	else
	256	printf("\n");
	257	}
	258	}
	259	# endif
	260
	261	/* actually fire the shots */
	262	Move.free = 0;
	263	for (i = 0; i < NBANKS; i++)
	264	{
	265	b = &bank[i];
	266	if (b->units <= 0)
	267	{
	268	continue;
	269	}
	270	printf("\nPhaser bank %d fires:\n", i);
	271	n = Etc.nkling;
	272	k = Etc.klingon;
	273	for (j = 0; j < n; j++)
	274	{
	275	if (b->units <= 0)
	276	break;
	277	/*
	278	** The formula for hit is as follows:
	279	**
	280	** zap = OMEGA * [(sigma + ALPHA) * (rho + BETA)]
	281	/ (dist 2 + EPSILON)]
	282	** * [cos(delta * sigma) + GAMMA]
	283	** * hit
	284	**
	285	** where sigma is the spread factor,
	286	** rho is a random number (0 -> 1),
	287	** GAMMA is a crud factor for angle (essentially
	288	** cruds up the spread factor),
	289	** delta is the difference in radians between the
	290	** angle you are shooting at and the actual
	291	** angle of the klingon,
	292	** ALPHA scales down the significance of sigma,
	293	** BETA scales down the significance of rho,
	294	** OMEGA is the magic number which makes everything
	295	** up to "* hit" between zero and one,
	296	** dist is the distance to the klingon
	297	** hit is the number of units in the bank, and
	298	** zap is the amount of the actual hit.
	299	**
	300	** Everything up through dist squared should maximize
	301	** at 1.0, so that the distance factor is never
	302	** greater than one. Conveniently, cos() is
303	** never greater than one, but the same restric-
304	** tion applies.
305	*/
306	distfactor = BETA + franf();
401a08c7 KL	307	distfactor *= ALPHA + b->spread;
401a08c7 KL	308	distfactor *= OMEGA;
c7124754	309	anglefactor = k->dist;
401a08c7 KL	310	distfactor /= anglefactor * anglefactor + EPSILON;
401a08c7 KL	311	distfactor *= b->units;
c7124754 KM	312	dx = Ship.sectx - k->x;
	313	dy = k->y - Ship.secty;
	314	anglefactor = atan2(dy, dx) - b->angle;
	315	anglefactor = cos((anglefactor * b->spread) + GAMMA);
	316	if (anglefactor < 0.0)
	317	{
	318	k++;
	319	continue;
	320	}
	321	hit = anglefactor * distfactor + 0.5;
401a08c7	322	k->power -= hit;
c7124754 KM	323	printf("%d unit hit on Klingon", hit);
	324	if (!damaged(SRSCAN))
	325	printf(" at %d,%d", k->x, k->y);
	326	printf("\n");
401a08c7	327	b->units -= hit;
c7124754 KM	328	if (k->power <= 0)
	329	{
	330	killk(k->x, k->y);
	331	continue;
	332	}
	333	k++;
	334	}
	335	}
	336
	337	/* compute overkill */
	338	for (i = 0; i < NBANKS; i++)
401a08c7	339	extra += bank[i].units;
c7124754 KM	340	if (extra > 0)
	341	printf("\n%d units expended on empty space\n", extra);
	342	}