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

#ifndef lint
static char sccsid[] = "@(#)phaser.c	4.2	(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
c7124754	1	#ifndef lint
401a08c7	2	static char sccsid[] = "@(#)phaser.c 4.2 (Berkeley) %G%";
c7124754 KM	3	#endif not lint
	4
	5	# include "trek.h"
	6	# include "getpar.h"
	7
	8	/* factors for phaser hits; see description below */
	9
	10	# define ALPHA 3.0 /* spread */
	11	# define BETA 3.0 /* franf() */
	12	# define GAMMA 0.30 /* cos(angle) */
	13	# define EPSILON 150.0 /* dist ** 2 */
	14	# define OMEGA 10.596 /* overall scaling factor */
	15
	16	/* OMEGA ~= 100 * (ALPHA + 1) * (BETA + 1) / (EPSILON + 1) */
	17
	18	/*
	19	** Phaser Control
	20	**
	21	** There are up to NBANKS phaser banks which may be fired
	22	** simultaneously. There are two modes, "manual" and
	23	** "automatic". In manual mode, you specify exactly which
	24	** direction you want each bank to be aimed, the number
	25	** of units to fire, and the spread angle. In automatic
	26	** mode, you give only the total number of units to fire.
	27	**
	28	** The spread is specified as a number between zero and
	29	** one, with zero being minimum spread and one being maximum
	30	** spread. You will normally want zero spread, unless your
	31	** short range scanners are out, in which case you probably
	32	** don't know exactly where the Klingons are. In that case,
	33	** you really don't have any choice except to specify a
	34	** fairly large spread.
	35	**
	36	** Phasers spread slightly, even if you specify zero spread.
	37	**
	38	** Uses trace flag 30
	39	*/
	40
401a08c7	41	struct cvntab Matab[] =
c7124754	42	{
401a08c7	43	"m", "anual", (int (*)())1, 0,
c7124754 KM	44	"a", "utomatic", 0, 0,
	45	0
	46	};
	47
	48	struct banks
	49	{
	50	int units;
401a08c7 KL	51	double angle;
401a08c7 KL	52	double spread;
c7124754 KM	53	};
	54
	55
	56
	57	phaser()
	58	{
	59	register int i;
	60	int j;
	61	register struct kling *k;
	62	double dx, dy;
	63	double anglefactor, distfactor;
	64	register struct banks *b;
	65	int manual, flag, extra;
	66	int hit;
	67	double tot;
	68	int n;
	69	int hitreqd[NBANKS];
	70	struct banks bank[NBANKS];
	71	struct cvntab *ptr;
	72
	73	if (Ship.cond == DOCKED)
	74	return(printf("Phasers cannot fire through starbase shields\n"));
	75	if (damaged(PHASER))
	76	return (out(PHASER));
	77	if (Ship.shldup)
	78	return (printf("Sulu: Captain, we cannot fire through shields.\n"));
	79	if (Ship.cloaked)
	80	{
	81	printf("Sulu: Captain, surely you must realize that we cannot fire\n");
	82	printf(" phasers with the cloaking device up.\n");
	83	return;
	84	}
	85
	86	/* decide if we want manual or automatic mode */
	87	manual = 0;
	88	if (testnl())
	89	{
	90	if (damaged(COMPUTER))
	91	{
	92	printf(Device[COMPUTER].name);
	93	manual++;
	94	}
	95	else
	96	if (damaged(SRSCAN))
	97	{
	98	printf(Device[SRSCAN].name);
	99	manual++;
	100	}
	101	if (manual)
	102	printf(" damaged, manual mode selected\n");
	103	}
	104
	105	if (!manual)
	106	{
	107	ptr = getcodpar("Manual or automatic", Matab);
401a08c7	108	manual = (int) ptr->value;
c7124754 KM	109	}
	110	if (!manual && damaged(COMPUTER))
	111	{
	112	printf("Computer damaged, manual selected\n");
	113	skiptonl(0);
	114	manual++;
	115	}
	116
	117	/* initialize the bank[] array */
	118	flag = 1;
	119	for (i = 0; i < NBANKS; i++)
	120	bank[i].units = 0;
	121	if (manual)
	122	{
	123	/* collect manual mode statistics */
	124	while (flag)
	125	{
	126	printf("%d units available\n", Ship.energy);
	127	extra = 0;
	128	flag = 0;
	129	for (i = 0; i < NBANKS; i++)
	130	{
	131	b = &bank[i];
	132	printf("\nBank %d:\n", i);
	133	hit = getintpar("units");
	134	if (hit < 0)
	135	return;
	136	if (hit == 0)
	137	break;
401a08c7	138	extra += hit;
c7124754 KM	139	if (extra > Ship.energy)
	140	{
	141	printf("available energy exceeded. ");
	142	skiptonl(0);
	143	flag++;
	144	break;
	145	}
	146	b->units = hit;
	147	hit = getintpar("course");
	148	if (hit < 0 \|\| hit > 360)
	149	return;
	150	b->angle = hit * 0.0174532925;
	151	b->spread = getfltpar("spread");
	152	if (b->spread < 0 \|\| b->spread > 1)
	153	return;
	154	}
401a08c7	155	Ship.energy -= extra;
c7124754 KM	156	}
	157	extra = 0;
	158	}
	159	else
	160	{
	161	/* automatic distribution of power */
	162	if (Etc.nkling <= 0)
	163	return (printf("Sulu: But there are no Klingons in this quadrant\n"));
	164	printf("Phasers locked on target. ");
	165	while (flag)
	166	{
	167	printf("%d units available\n", Ship.energy);
	168	hit = getintpar("Units to fire");
	169	if (hit <= 0)
	170	return;
	171	if (hit > Ship.energy)
	172	{
	173	printf("available energy exceeded. ");
	174	skiptonl(0);
	175	continue;
	176	}
	177	flag = 0;
401a08c7	178	Ship.energy -= hit;
c7124754 KM	179	extra = hit;
	180	n = Etc.nkling;
	181	if (n > NBANKS)
	182	n = NBANKS;
	183	tot = n * (n + 1) / 2;
	184	for (i = 0; i < n; i++)
	185	{
	186	k = &Etc.klingon[i];
	187	b = &bank[i];
	188	distfactor = k->dist;
	189	anglefactor = ALPHA * BETA * OMEGA / (distfactor * distfactor + EPSILON);
401a08c7	190	anglefactor *= GAMMA;
c7124754	191	distfactor = k->power;
401a08c7	192	distfactor /= anglefactor;
c7124754 KM	193	hitreqd[i] = distfactor + 0.5;
	194	dx = Ship.sectx - k->x;
	195	dy = k->y - Ship.secty;
	196	b->angle = atan2(dy, dx);
	197	b->spread = 0.0;
	198	b->units = ((n - i) / tot) * extra;
	199	# ifdef xTRACE
	200	if (Trace)
	201	{
	202	printf("b%d hr%d u%d df%.2f af%.2f\n",
	203	i, hitreqd[i], b->units,
	204	distfactor, anglefactor);
	205	}
	206	# endif
401a08c7	207	extra -= b->units;
c7124754 KM	208	hit = b->units - hitreqd[i];
	209	if (hit > 0)
	210	{
401a08c7 KL	211	extra += hit;
401a08c7 KL	212	b->units -= hit;
c7124754 KM	213	}
	214	}
	215
	216	/* give out any extra energy we might have around */
	217	if (extra > 0)
	218	{
	219	for (i = 0; i < n; i++)
	220	{
	221	b = &bank[i];
	222	hit = hitreqd[i] - b->units;
	223	if (hit <= 0)
	224	continue;
	225	if (hit >= extra)
	226	{
401a08c7	227	b->units += extra;
c7124754 KM	228	extra = 0;
	229	break;
	230	}
	231	b->units = hitreqd[i];
401a08c7	232	extra -= hit;
c7124754 KM	233	}
	234	if (extra > 0)
	235	printf("%d units overkill\n", extra);
	236	}
	237	}
	238	}
	239
	240	# ifdef xTRACE
	241	if (Trace)
	242	{
	243	for (i = 0; i < NBANKS; i++)
	244	{
	245	b = &bank[i];
	246	printf("b%d u%d", i, b->units);
	247	if (b->units > 0)
	248	printf(" a%.2f s%.2f\n", b->angle, b->spread);
	249	else
	250	printf("\n");
	251	}
	252	}
	253	# endif
	254
	255	/* actually fire the shots */
	256	Move.free = 0;
	257	for (i = 0; i < NBANKS; i++)
	258	{
	259	b = &bank[i];
	260	if (b->units <= 0)
	261	{
	262	continue;
	263	}
	264	printf("\nPhaser bank %d fires:\n", i);
	265	n = Etc.nkling;
	266	k = Etc.klingon;
	267	for (j = 0; j < n; j++)
	268	{
	269	if (b->units <= 0)
	270	break;
	271	/*
	272	** The formula for hit is as follows:
	273	**
	274	** zap = OMEGA * [(sigma + ALPHA) * (rho + BETA)]
	275	/ (dist 2 + EPSILON)]
	276	** * [cos(delta * sigma) + GAMMA]
	277	** * hit
	278	**
	279	** where sigma is the spread factor,
	280	** rho is a random number (0 -> 1),
	281	** GAMMA is a crud factor for angle (essentially
	282	** cruds up the spread factor),
	283	** delta is the difference in radians between the
	284	** angle you are shooting at and the actual
	285	** angle of the klingon,
	286	** ALPHA scales down the significance of sigma,
	287	** BETA scales down the significance of rho,
	288	** OMEGA is the magic number which makes everything
	289	** up to "* hit" between zero and one,
	290	** dist is the distance to the klingon
	291	** hit is the number of units in the bank, and
	292	** zap is the amount of the actual hit.
	293	**
	294	** Everything up through dist squared should maximize
	295	** at 1.0, so that the distance factor is never
	296	** greater than one. Conveniently, cos() is
297	** never greater than one, but the same restric-
298	** tion applies.
299	*/
300	distfactor = BETA + franf();
401a08c7 KL	301	distfactor *= ALPHA + b->spread;
401a08c7 KL	302	distfactor *= OMEGA;
c7124754	303	anglefactor = k->dist;
401a08c7 KL	304	distfactor /= anglefactor * anglefactor + EPSILON;
401a08c7 KL	305	distfactor *= b->units;
c7124754 KM	306	dx = Ship.sectx - k->x;
	307	dy = k->y - Ship.secty;
	308	anglefactor = atan2(dy, dx) - b->angle;
	309	anglefactor = cos((anglefactor * b->spread) + GAMMA);
	310	if (anglefactor < 0.0)
	311	{
	312	k++;
	313	continue;
	314	}
	315	hit = anglefactor * distfactor + 0.5;
401a08c7	316	k->power -= hit;
c7124754 KM	317	printf("%d unit hit on Klingon", hit);
	318	if (!damaged(SRSCAN))
	319	printf(" at %d,%d", k->x, k->y);
	320	printf("\n");
401a08c7	321	b->units -= hit;
c7124754 KM	322	if (k->power <= 0)
	323	{
	324	killk(k->x, k->y);
	325	continue;
	326	}
	327	k++;
	328	}
	329	}
	330
	331	/* compute overkill */
	332	for (i = 0; i < NBANKS; i++)
401a08c7	333	extra += bank[i].units;
c7124754 KM	334	if (extra > 0)
	335	printf("\n%d units expended on empty space\n", extra);
	336	}