2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2007, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * See files README, COPYING and CREDITS in the root of the source
23 * tree for related information and legal notices. It is expected
24 * that future projects/authors will amend these files as needed.
28 * aircombat.c: Deal with air to air combat
30 * Known contributors to this file:
32 * Thomas Ruschak, 1992
34 * Markus Armbruster, 2006
50 #include "prototypes.h"
56 #define FLAK_GUN_MAX 14
58 static void ac_intercept(struct emp_qelem *, struct emp_qelem *,
59 struct emp_qelem *, natid, coord, coord);
60 static int all_missiles(struct emp_qelem *);
61 static void ac_dog(struct plist *, struct plist *);
62 static void ac_planedamage(struct plist *, natid, int, natid, int,
64 static void ac_doflak(struct emp_qelem *, struct sctstr *);
65 static void ac_landflak(struct emp_qelem *, coord, coord);
66 static void ac_shipflak(struct emp_qelem *, coord, coord);
67 static void ac_fireflak(struct emp_qelem *, natid, int);
68 static void getilist(struct emp_qelem *, natid,
69 struct emp_qelem *, struct emp_qelem *,
70 struct emp_qelem *, struct emp_qelem *);
71 static int can_fly(int);
72 static int do_evade(struct emp_qelem *, struct emp_qelem *);
75 ac_encounter(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
76 coord x, coord y, char *path, int mission_flags,
77 int no_air_defense, struct emp_qelem *obomb,
78 struct emp_qelem *oesc)
80 int val, non_missiles;
86 int unfriendly[MAXNOC];
88 struct emp_qelem ilist[MAXNOC], *qp;
98 struct natstr *over, *mynatp;
101 struct shiplist *head = NULL;
103 int intown = 0; /* Last owner to intercept */
104 /* We want to only intercept once per sector per owner. So, if we overfly
105 a sector, and then overfly some land units or ships, we don't want to
106 potentially intercept 3 times. */
108 plp = (struct plist *)bomb_list->q_forw;
109 plane_owner = plp->plane.pln_own;
111 strncpy(mypath, path, sizeof(mypath));
114 memset(overfly, 0, sizeof(overfly));
115 memset(gotilist, 0, sizeof(gotilist));
116 memset(unfriendly, 0, sizeof(unfriendly));
117 for (cn = 1; cn < MAXNOC; cn++) {
118 if ((mynatp = getnatp(cn)) == 0)
120 rel = getrel(mynatp, plane_owner);
123 if (plane_owner == cn)
127 if (mission_flags & PM_R) {
128 if (mission_flags & P_S) {
129 PR(plane_owner, "\nSPY Plane report\n");
132 } else if (mission_flags & P_A) {
133 PR(plane_owner, "\nAnti-Sub Patrol report\n");
135 PR(plane_owner, "\nReconnaissance report\n");
140 pln_removedupes(bomb_list, esc_list);
141 while ((dir = mypath[myp++]) && !QEMPTY(bomb_list)) {
142 if ((val = diridx(dir)) == DIR_STOP)
144 /* XXX using xnorm is probably bad */
145 x = xnorm(x + diroff[val][0]);
146 y = ynorm(y + diroff[val][1]);
147 getsect(x, y, §);
148 over = getnatp(sect.sct_own);
150 if (mission_flags & PM_R) {
152 setcont(plane_owner, sect.sct_own, FOUND_FLY);
153 if (sect.sct_type == SCT_WATER) {
154 PR(plane_owner, "flying over %s at %s\n",
155 dchr[sect.sct_type].d_name, xyas(x, y, plane_owner));
156 if (mission_flags & PM_S)
157 plane_sweep(bomb_list, x, y);
158 if (mission_flags & P_A) {
159 plane_sona(bomb_list, x, y, &head);
161 changed += map_set(plane_owner,
162 sect.sct_x, sect.sct_y,
163 dchr[sect.sct_type].d_mnem, 0);
164 } else if (mission_flags & P_S) {
165 satdisp_sect(§, (mission_flags & P_I) ? 10 : 50);
167 /* This is borrowed from lookout */
168 if (sect.sct_own == plane_owner)
169 PR(plane_owner, "Your ");
171 PR(plane_owner, "%s (#%d) ",
172 cname(sect.sct_own), sect.sct_own);
173 PR(plane_owner, "%s", dchr[sect.sct_type].d_name);
174 changed += map_set(plane_owner,
175 sect.sct_x, sect.sct_y,
176 dchr[sect.sct_type].d_mnem, 0);
177 PR(plane_owner, " %d%% efficient ",
178 (sect.sct_own == plane_owner) ?
179 sect.sct_effic : roundintby((int)sect.sct_effic, 25));
180 civ = sect.sct_item[I_CIVIL];
181 mil = sect.sct_item[I_MILIT];
183 PR(plane_owner, "with %s%d civ ",
184 (sect.sct_own == plane_owner) ?
186 (sect.sct_own == plane_owner) ?
187 civ : roundintby(civ, 25));
189 PR(plane_owner, "with %s%d mil ",
190 (sect.sct_own == plane_owner) ?
192 (sect.sct_own == plane_owner) ?
193 mil : roundintby(mil, 25));
194 PR(plane_owner, "@ %s\n", xyas(x, y, plane_owner));
196 if (mission_flags & P_S)
197 satdisp_units(sect.sct_x, sect.sct_y);
199 PR(plane_owner, "flying over %s at %s\n",
200 dchr[sect.sct_type].d_name, xyas(x, y, plane_owner));
201 changed += map_set(plane_owner, sect.sct_x, sect.sct_y,
202 dchr[sect.sct_type].d_mnem, 0);
204 if ((rel = getrel(over, plane_owner)) == ALLIED)
207 evaded = do_evade(bomb_list, esc_list);
209 if (sect.sct_own != 0 && sect.sct_own != plane_owner && !evaded) {
210 /* We only show planes overhead if they didn't
212 overfly[sect.sct_own]++;
213 PR(sect.sct_own, "%s planes spotted over %s\n",
214 cname(plane_owner), xyas(x, y, sect.sct_own));
216 setcont(cn, plane_owner, FOUND_FLY);
221 if (unfriendly[sect.sct_own])
222 ac_doflak(bomb_list, §);
223 /* If bombers left, fire flak from units and ships */
224 if (!QEMPTY(bomb_list))
225 ac_landflak(bomb_list, x, y);
226 if (!QEMPTY(bomb_list))
227 ac_shipflak(bomb_list, x, y);
229 /* mission planes aborted due to flak -- don't send escorts */
230 if (QEMPTY(bomb_list))
232 if (!no_air_defense && !evaded)
233 air_defense(x, y, plane_owner, bomb_list, esc_list);
235 if (sect.sct_own == 0 || sect.sct_own == plane_owner)
242 for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw) {
243 struct plist *ip = (struct plist *)qp;
244 if (!(plchr[(int)ip->plane.pln_type].pl_flags & P_M))
251 if (unfriendly[sect.sct_own] && !gotilist[sect.sct_own]) {
252 getilist(&ilist[sect.sct_own], sect.sct_own,
253 bomb_list, esc_list, obomb, oesc);
254 gotilist[sect.sct_own]++;
258 ac_intercept(bomb_list, esc_list, &ilist[sect.sct_own],
260 intown = sect.sct_own;
263 /* Let's report all of the overflights even if aborted */
264 for (cn = 1; cn < MAXNOC; cn++) {
265 if (plane_owner == cn)
268 nreport(plane_owner, N_OVFLY_SECT, cn, overfly[cn]);
270 /* If the map changed, update it */
272 if (!update_pending && plane_owner == player->cnum)
273 writemap(player->cnum);
274 /* Now, if the bomber and escort lists are empty, we are done */
275 if (QEMPTY(bomb_list) && QEMPTY(esc_list)) {
276 if (mission_flags & P_A)
277 free_shiplist(&head);
281 /* Something made it through */
282 /* Go figure out if there are ships in this sector, and who's they are */
283 memset(nats, 0, sizeof(nats));
284 snxtitem_xy(&ni, EF_SHIP, x, y);
285 while (nxtitem(&ni, &ship)) {
286 if (mchr[(int)ship.shp_type].m_flags & M_SUB)
288 nats[ship.shp_own]++;
290 /* Go figure out if there are units in this sector, and who's they are */
291 memset(lnats, 0, sizeof(lnats));
292 snxtitem_xy(&ni, EF_LAND, x, y);
293 while (nxtitem(&ni, &land)) {
294 if (land.lnd_ship >= 0 || land.lnd_land >= 0)
296 lnats[land.lnd_own]++;
299 /* Now, let's make life a little rougher. */
300 for (cn = 1; cn < MAXNOC && !QEMPTY(bomb_list); cn++) {
301 if (plane_owner == cn)
304 /* Are there ships owned by this country? */
308 PR(cn, "%s planes spotted over ships in %s\n",
309 cname(plane_owner), xyas(x, y, cn));
311 setcont(cn, plane_owner, FOUND_FLY);
313 if (unfriendly[cn]) {
314 /* They are unfriendly too */
316 getilist(&ilist[cn], cn, bomb_list, esc_list, obomb,
320 PR(plane_owner, "Flying over %s ships in %s\n",
321 cname(cn), xyas(x, y, plane_owner));
322 /* This makes going for ships in harbors tough */
324 /* We already fired flak up above. Now we intercept again if we haven't already */
325 /* Flag that we intercepted */
327 /* And now intercept again */
328 ac_intercept(bomb_list, esc_list, &ilist[cn],
333 /* Are there units owned by this country? */
334 if (lnats[cn] != 0) {
337 PR(cn, "%s planes spotted over land units in %s\n",
338 cname(plane_owner), xyas(x, y, cn));
340 setcont(cn, plane_owner, FOUND_FLY);
342 if (unfriendly[cn]) {
343 /* They are unfriendly too */
345 getilist(&ilist[cn], cn, bomb_list, esc_list, obomb,
349 PR(plane_owner, "Flying over %s land units in %s\n",
350 cname(cn), xyas(x, y, plane_owner));
353 /* We haven't intercepted yet, so intercept */
354 ac_intercept(bomb_list, esc_list, &ilist[cn],
361 if (mission_flags & P_A)
362 free_shiplist(&head);
366 count_non_missiles(struct emp_qelem *list)
368 struct emp_qelem *qp;
372 /* don't intercept missiles */
373 for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
374 plp = (struct plist *)qp;
375 if (!(plp->pcp->pl_flags & P_M))
382 sam_intercept(struct emp_qelem *att_list, struct emp_qelem *def_list,
383 natid def_own, natid plane_owner, coord x, coord y,
386 struct emp_qelem *aqp;
387 struct emp_qelem *anext;
388 struct emp_qelem *dqp;
389 struct emp_qelem *dnext;
394 for (aqp = att_list->q_forw,
395 dqp = def_list->q_forw;
396 aqp != att_list && dqp != def_list; aqp = anext) {
398 aplp = (struct plist *)aqp;
399 if (aplp->pcp->pl_flags & P_M)
401 if (aplp->pcp->pl_cost < 1000)
403 for (; dqp != def_list; dqp = dnext) {
405 dplp = (struct plist *)dqp;
406 if (!(dplp->pcp->pl_flags & P_M))
409 if (dplp->plane.pln_range <
410 mapdist(x, y, dplp->plane.pln_x, dplp->plane.pln_y)) {
415 if (mission_pln_equip(dplp, 0, P_F, 0) < 0) {
422 PR(plane_owner, "%s launches SAMs!\n", cname(def_own));
423 PR(def_own, "Launching SAMs at %s planes!\n",
425 ac_combat_headers(plane_owner, def_own);
433 PR(plane_owner, "\n");
436 if (delete_missiles) {
437 for (; dqp != def_list; dqp = dnext) {
439 dplp = (struct plist *)dqp;
440 if (!(dplp->pcp->pl_flags & P_M))
450 ac_intercept(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
451 struct emp_qelem *def_list, natid def_own, coord x, coord y)
456 struct emp_qelem *next;
457 struct emp_qelem *qp;
458 struct emp_qelem int_list;
463 plp = (struct plist *)bomb_list->q_forw;
464 plane_owner = plp->plane.pln_own;
468 sam_intercept(bomb_list, def_list, def_own, plane_owner, x, y, 0);
469 sam_intercept(esc_list, def_list, def_own, plane_owner, x, y, 1);
470 if (!(att_count = count_non_missiles(bomb_list) +
471 count_non_missiles(esc_list)))
474 emp_initque(&int_list);
475 for (qp = def_list->q_forw; qp != def_list; qp = next) {
477 plp = (struct plist *)qp;
479 /* SAMs interdict separately */
480 if (plp->pcp->pl_flags & P_M)
482 dist = mapdist(x, y, pp->pln_x, pp->pln_y) * 2;
483 if (pp->pln_range < dist)
485 if (mission_pln_equip(plp, 0, P_F, 0) < 0) {
490 /* got one; delete from def_list, add to int_list */
492 emp_insque(qp, &int_list);
493 pp->pln_mobil -= pln_mobcost(dist, pp, P_F);
494 putplane(pp->pln_uid, pp);
496 if (icount > att_count)
501 PR(plane_owner, "%d %s fighter%s rising to intercept!\n",
502 icount, cname(def_own), icount == 1 ? " is" : "s are");
503 PR(def_own, "%d fighter%s intercepting %s planes!\n",
504 icount, icount == 1 ? " is" : "s are", cname(plane_owner));
505 ac_combat_headers(plane_owner, def_own);
506 ac_airtoair(esc_list, &int_list);
507 ac_airtoair(bomb_list, &int_list);
508 PR(plane_owner, "\n");
513 ac_combat_headers(natid plane_owner, natid def_own)
516 " %-10.10s %-10.10s strength int odds damage results\n",
517 cname(plane_owner), cname(def_own));
519 " %-10.10s %-10.10s strength int odds damage results\n",
520 cname(def_own), cname(plane_owner));
527 ac_airtoair(struct emp_qelem *att_list, struct emp_qelem *int_list)
529 struct plist *attacker;
530 struct plist *interceptor;
531 struct emp_qelem *att;
532 struct emp_qelem *in;
536 struct emp_qelem *att_next;
537 struct emp_qelem *in_next;
539 att = att_list->q_forw;
540 in = int_list->q_forw;
543 if (QEMPTY(att_list) || QEMPTY(int_list)) {
547 while (more_att || more_int) {
548 in_next = in->q_forw;
549 att_next = att->q_forw;
550 attacker = (struct plist *)att;
552 /* skip missiles. If only missiles left, we're done */
553 if (plchr[(int)attacker->plane.pln_type].pl_flags & P_M) {
555 if (att == att_list) {
557 if (QEMPTY(att_list))
562 if (all_missiles(att_list))
566 interceptor = (struct plist *)in;
567 nplanes = attacker->plane.pln_effic;
568 if (nplanes > interceptor->plane.pln_effic)
569 nplanes = interceptor->plane.pln_effic;
570 ac_dog(attacker, interceptor);
573 if (att == att_list) {
575 if (QEMPTY(att_list))
580 if (in == int_list) {
582 if (QEMPTY(int_list))
591 all_missiles(struct emp_qelem *att_list)
593 struct emp_qelem *qp;
596 qp = att_list->q_forw;
597 while (qp != att_list) {
598 p = (struct plist *)qp;
599 if (!(plchr[(int)p->plane.pln_type].pl_flags & P_M))
608 ac_dog(struct plist *ap, struct plist *dp)
613 natid att_own, def_own;
618 att_own = ap->plane.pln_own;
619 def_own = dp->plane.pln_own;
621 PR(att_own, " %3.3s #%-4d %3.3s #%-4d",
623 ap->plane.pln_uid, dp->pcp->pl_name, dp->plane.pln_uid);
625 PR(def_own, " %3.3s #%-4d %3.3s #%-4d",
627 dp->plane.pln_uid, ap->pcp->pl_name, ap->plane.pln_uid);
628 if (ap->plane.pln_att == 0) {
629 att = ap->plane.pln_def * ap->plane.pln_effic / 100;
630 att = MAX(att, ap->pcp->pl_def / 2);
632 att = ap->plane.pln_att * ap->plane.pln_effic / 100;
633 att = MAX(att, ap->pcp->pl_att / 2);
636 def = dp->plane.pln_def * dp->plane.pln_effic / 100;
637 def = MAX(def, dp->pcp->pl_def / 2);
639 if ((ap->pcp->pl_flags & P_F) && ap->bombs != 0)
641 if ((dp->pcp->pl_flags & P_F) && dp->bombs != 0)
643 att += ap->pcp->pl_stealth / 25.0;
644 def += dp->pcp->pl_stealth / 25.0;
653 odds = ((double)att / ((double)def + (double)att));
656 intensity = roll(20) + roll(20) + roll(20) + roll(20) + 1;
658 PR(att_own, " %3d/%-3d %3d %3.2f ", att, def, intensity, odds);
659 PR(def_own, " %3d/%-3d %3d %3.2f ", def, att, intensity, odds);
663 while ((intensity--) > 0) {
667 if ((dp->plane.pln_effic - ddam) < PLANE_MINEFF)
671 if ((ap->plane.pln_effic - adam) < PLANE_MINEFF)
676 if (dp->pcp->pl_flags & P_M)
679 PR(att_own, "%3d/%-3d", adam, ddam);
680 PR(def_own, "%3d/%-3d", ddam, adam);
681 ac_planedamage(ap, def_own, adam, def_own, 1, 0, mesg);
682 strncpy(temp, mesg, 14);
683 ac_planedamage(dp, att_own, ddam, att_own, 1, 0, mesg);
684 PR(att_own, "%-13.13s %-13.13s\n", temp, mesg);
685 PR(def_own, "%-13.13s %-13.13s\n", mesg, temp);
688 setcont(att_own, def_own, FOUND_FLY);
689 setcont(def_own, att_own, FOUND_FLY);
694 * zap plane associated with plp.
695 * Damaging country is "from", damage is "dam".
696 * def_own is the country on the other side of the conflict from the plane
697 * owner. The only time def_own != from is when the interceptor is getting
700 * NOTE: This routine removes the appropriate plane element from the
701 * queue if it gets destroyed. That means that the caller must assume
702 * that the current queue pointer is invalid on return from the ac_planedamage
703 * call. (this has caused bugs in the past)
706 ac_planedamage(struct plist *plp, natid from, int dam, natid other,
707 int checkabort, int show, char *mesg)
719 plane_owner = pp->pln_own;
721 sprintf(dmess, " no damage");
726 memset(dmess, 0, sizeof(dmess));
730 if (eff < PLANE_MINEFF) {
731 sprintf(dmess, " shot down");
733 } else if (eff < 80 && chance((80 - eff) / 100.0) && checkabort) {
734 sprintf(dmess, " aborted @%2d%%", eff);
736 } else if (show == 0) {
737 sprintf(dmess, " cleared");
740 if ((plp->pcp->pl_flags & P_M) == 0) {
742 PR(plane_owner, " %s %s takes %d%s.\n",
743 cname(pp->pln_own), prplane(pp), dam, dmess);
745 PR(other, " %s %s takes %d%s.\n",
746 cname(pp->pln_own), prplane(pp), dam, dmess);
749 if (show && checkabort == 1) {
750 PR(plane_owner, "\n");
756 pp->pln_mobil -= MIN(32 + pp->pln_mobil, dam / 2);
758 if (from != 0 && (plp->pcp->pl_flags & P_M) == 0)
759 nreport(from, N_DOWN_PLANE, pp->pln_own, 1);
760 if (pp->pln_ship >= 0) {
761 getship(pp->pln_ship, &ship);
762 take_plane_off_ship(pp, &ship);
764 if (pp->pln_land >= 0) {
765 getland(pp->pln_land, &land);
766 take_plane_off_land(pp, &land);
769 putplane(pp->pln_uid, pp);
770 emp_remque(&plp->queue);
772 } else if (disp == 2) {
773 putplane(pp->pln_uid, pp);
774 emp_remque(&plp->queue);
777 putplane(pp->pln_uid, pp);
782 ac_doflak(struct emp_qelem *list, struct sctstr *from)
789 plp = (struct plist *)list->q_forw;
790 plane_owner = plp->plane.pln_own;
792 gun = MIN(FLAK_GUN_MAX, from->sct_item[I_GUN]);
793 shell = from->sct_item[I_SHELL];
794 if (gun > shell * 2) {
795 shell += supply_commod(from->sct_own, from->sct_x, from->sct_y,
796 I_SHELL, (gun + 1) / 2 - shell);
797 from->sct_item[I_SHELL] = shell;
803 gun = roundavg(tfact(from->sct_own, 2.0 * gun));
805 PR(plane_owner, "firing %d flak guns in %s...\n",
806 gun, xyas(from->sct_x, from->sct_y, plane_owner));
807 if (from->sct_own != 0)
808 PR(from->sct_own, "firing %d flak guns in %s...\n",
809 gun, xyas(from->sct_x, from->sct_y, from->sct_own));
810 ac_fireflak(list, from->sct_own, gun);
815 ac_shipflak(struct emp_qelem *list, coord x, coord y)
820 double flak, total, ngun;
828 plp = (struct plist *)list->q_forw;
829 plane_owner = plp->plane.pln_own;
831 memset(nats, 0, sizeof(nats));
833 snxtitem_xy(&ni, EF_SHIP, x, y);
834 while (!QEMPTY(list) && nxtitem(&ni, &ship)) {
835 if (ship.shp_own == 0 || ship.shp_own == plane_owner)
837 mcp = &mchr[(int)ship.shp_type];
838 if (mcp->m_flags & M_SUB)
840 rel = getrel(getnatp(ship.shp_own), plane_owner);
844 gun = MIN(ship.shp_item[I_GUN], ship.shp_glim);
846 shell = ship.shp_item[I_SHELL];
848 shell = supply_commod(ship.shp_own, ship.shp_x, ship.shp_y,
850 ship.shp_item[I_SHELL] = shell;
851 putship(ship.shp_uid, &ship);
854 if (gun == 0 || shell == 0)
856 flak = gun * (ship.shp_effic / 100.0);
858 total += techfact(ship.shp_tech, flak * 2.0);
860 if (!nats[ship.shp_own]) {
861 /* First time here, print the message */
862 PR(ship.shp_own, "%s planes spotted over ships in %s\n",
863 cname(plane_owner), xyas(x, y, ship.shp_own));
864 PR(plane_owner, "Flying over %s ships in %s\n",
865 cname(ship.shp_own), xyas(x, y, plane_owner));
866 nats[ship.shp_own] = 1;
868 PR(ship.shp_own, "firing %.0f flak guns from %s...\n",
869 flak, prship(&ship));
873 /* Limit to FLAK_GUN_MAX guns of average tech factor */
874 if (ngun > FLAK_GUN_MAX)
875 total *= FLAK_GUN_MAX / ngun;
877 gun = roundavg(total);
879 PR(plane_owner, "Flak! Ships firing %d flak guns...\n", gun);
880 ac_fireflak(list, from, gun);
885 ac_landflak(struct emp_qelem *list, coord x, coord y)
890 double flak, total, ngun;
898 plp = (struct plist *)list->q_forw;
899 plane_owner = plp->plane.pln_own;
901 memset(nats, 0, sizeof(nats));
903 snxtitem_xy(&ni, EF_LAND, x, y);
904 while (!QEMPTY(list) && nxtitem(&ni, &land)) {
905 if (land.lnd_own == 0 || land.lnd_own == plane_owner)
907 lcp = &lchr[(int)land.lnd_type];
908 if ((lcp->l_flags & L_FLAK) == 0 || land.lnd_aaf == 0)
910 if (land.lnd_ship >= 0 || land.lnd_land >= 0)
912 rel = getrel(getnatp(land.lnd_own), plane_owner);
915 flak = land.lnd_aaf * 1.5 * land.lnd_effic / 100.0;
917 total += techfact(land.lnd_tech, flak * 2.0);
919 if (!nats[land.lnd_own]) {
920 /* First time here, print the message */
921 PR(land.lnd_own, "%s planes spotted over land units in %s\n",
922 cname(plane_owner), xyas(x, y, land.lnd_own));
923 PR(plane_owner, "Flying over %s land units in %s\n",
924 cname(land.lnd_own), xyas(x, y, plane_owner));
925 nats[land.lnd_own] = 1;
927 PR(land.lnd_own, "firing flak guns from unit %s (aa rating %d)\n",
928 prland(&land), land.lnd_aaf);
932 /* Limit to FLAK_GUN_MAX guns of average tech factor */
933 if (ngun > FLAK_GUN_MAX)
934 total *= FLAK_GUN_MAX / ngun;
936 gun = roundavg(total);
938 PR(plane_owner, "Flak! Land units firing %d flak guns...\n", gun);
939 ac_fireflak(list, from, gun);
944 * Called from shipflak, landflak, and doflak.
947 ac_fireflak(struct emp_qelem *list, natid from, int guns)
951 struct emp_qelem *qp;
952 struct emp_qelem *next;
955 plp = (struct plist *)list->q_forw;
957 for (qp = list->q_forw; qp != list; qp = next) {
959 plp = (struct plist *)qp;
960 n = ac_flak_dam(guns, plp->plane.pln_def, plp->pcp->pl_flags);
961 ac_planedamage(plp, from, n, 0, 2, 1, msg);
966 * Calculate flak damage
969 ac_flak_dam(int guns, int def, int pl_flags)
973 /* <-7 -7 -6 -5 -4 */
974 static float flaktable[18] = { 0.132f, 0.20f, 0.20f, 0.25f, 0.30f,
975 /* -3 -2 -1 0 +1 +2 +3 +4 */
976 0.35f, 0.40f, 0.45f, 0.50f, 0.50f, 0.55f, 0.60f, 0.65f,
977 /* +5 +6 +7 +8 >+8 */
978 0.70f,0.75f, 0.80f, 0.85f, 1.1305f };
979 enum { FLAK_MAX = sizeof(flaktable)/sizeof(flaktable[0]) - 1 };
982 if ((pl_flags & P_T) == 0)
990 mult = flaktable[FLAK_MAX];
995 mult = flaktable[flak];
998 dam = (int)((roll(8) + 2) * mult);
1005 * See if this plane is flying in this list
1008 ac_isflying(struct plnstr *plane, struct emp_qelem *list)
1010 struct emp_qelem *qp;
1011 struct emp_qelem *next;
1017 for (qp = list->q_forw; qp != list; qp = next) {
1019 plp = (struct plist *)qp;
1021 if (plane->pln_uid == pp->pln_uid)
1029 * Get a list of planes available for interception duties.
1032 getilist(struct emp_qelem *list, natid own, struct emp_qelem *a,
1033 struct emp_qelem *b, struct emp_qelem *c, struct emp_qelem *d)
1035 struct plchrstr *pcp;
1036 struct plnstr plane;
1040 struct nstr_item ni;
1045 snxtitem_all(&ni, EF_PLANE);
1046 while (nxtitem(&ni, &plane)) {
1047 if (plane.pln_own != own)
1049 pcp = &plchr[(int)plane.pln_type];
1050 if ((pcp->pl_flags & P_F) == 0)
1052 if (plane.pln_mission != 0)
1054 if (plane.pln_mobil <= 0)
1056 if (plane.pln_effic < 40)
1058 if (plane.pln_ship >= 0) {
1059 if (!can_fly(plane.pln_uid))
1061 getship(plane.pln_ship, &ship);
1062 petrol = ship.shp_item[I_PETROL];
1063 } else if (plane.pln_land >= 0) {
1064 if (!can_fly(plane.pln_uid))
1066 getland(plane.pln_land, &land);
1067 petrol = land.lnd_item[I_PETROL];
1069 getsect(plane.pln_x, plane.pln_y, §);
1070 petrol = sect.sct_item[I_PETROL];
1071 if ((sect.sct_effic < 60 || sect.sct_type != SCT_AIRPT)
1072 && (pcp->pl_flags & P_V) == 0)
1075 if (petrol <= pcp->pl_fuel / 2)
1077 /* Finally, is it in the list of planes already in
1079 if (ac_isflying(&plane, a))
1081 if (ac_isflying(&plane, b))
1083 if (ac_isflying(&plane, c))
1085 if (ac_isflying(&plane, d))
1088 ip = malloc(sizeof(*ip));
1091 ip->pcp = &plchr[(int)plane.pln_type];
1093 emp_insque(&ip->queue, list);
1101 { /* Can this plane fly from the ship or land unit it is on? */
1102 struct plnstr plane;
1105 struct plchrstr *pcp;
1106 struct mchrstr *scp;
1108 getplane(p, &plane);
1109 pcp = &plchr[(int)plane.pln_type];
1111 if (plane.pln_ship >= 0) {
1112 if (!(pcp->pl_flags & P_L) && !(pcp->pl_flags & P_M)
1113 && !(pcp->pl_flags & P_K)
1114 && !(pcp->pl_flags & P_E)
1118 getship(plane.pln_ship, &ship);
1119 scp = &mchr[(int)ship.shp_type];
1121 if ((pcp->pl_flags & P_L) && (scp->m_flags & M_FLY)) {
1125 if ((pcp->pl_flags & P_M) && (scp->m_flags & M_MSL)) {
1129 if ((pcp->pl_flags & P_K) && (scp->m_flags & M_CHOPPER)) {
1133 if ((pcp->pl_flags & P_E) && (scp->m_flags & M_XLIGHT)) {
1138 if (plane.pln_land >= 0) {
1139 if (!(pcp->pl_flags & P_E))
1142 getland(plane.pln_land, &land);
1144 if ((pcp->pl_flags & P_E) && land.lnd_maxlight) {
1153 do_evade(struct emp_qelem *bomb_list, struct emp_qelem *esc_list)
1155 struct emp_qelem *qp;
1160 for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw) {
1161 plp = (struct plist *)qp;
1162 if (evade > plp->pcp->pl_stealth / 100.0)
1163 evade = plp->pcp->pl_stealth / 100.0;
1165 for (qp = esc_list->q_forw; qp != esc_list; qp = qp->q_forw) {
1166 plp = (struct plist *)qp;
1167 if (evade > plp->pcp->pl_stealth / 100.0)
1168 evade = plp->pcp->pl_stealth / 100.0;