2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2008, 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, 2006-2008
50 #include "prototypes.h"
55 #define FLAK_GUN_MAX 14
57 static void ac_intercept(struct emp_qelem *, struct emp_qelem *,
58 struct emp_qelem *, natid, coord, coord);
59 static int all_missiles(struct emp_qelem *);
60 static void ac_dog(struct plist *, struct plist *);
61 static void ac_planedamage(struct plist *, natid, int, natid, int,
63 static void ac_doflak(struct emp_qelem *, struct sctstr *);
64 static void ac_landflak(struct emp_qelem *, coord, coord);
65 static void ac_shipflak(struct emp_qelem *, coord, coord);
66 static void ac_fireflak(struct emp_qelem *, natid, int);
67 static void getilist(struct emp_qelem *, natid,
68 struct emp_qelem *, struct emp_qelem *,
69 struct emp_qelem *, struct emp_qelem *);
70 static int do_evade(struct emp_qelem *, struct emp_qelem *);
73 ac_encounter(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
74 coord x, coord y, char *path, int mission_flags,
75 int no_air_defense, struct emp_qelem *obomb,
76 struct emp_qelem *oesc)
78 int val, non_missiles;
84 int unfriendly[MAXNOC];
86 struct emp_qelem ilist[MAXNOC], *qp;
96 struct natstr *over, *mynatp;
99 struct shiplist *head = NULL;
101 int intown = 0; /* Last owner to intercept */
102 /* We want to only intercept once per sector per owner. So, if we overfly
103 a sector, and then overfly some land units or ships, we don't want to
104 potentially intercept 3 times. */
106 plp = (struct plist *)bomb_list->q_forw;
107 plane_owner = plp->plane.pln_own;
109 strncpy(mypath, path, sizeof(mypath));
112 memset(overfly, 0, sizeof(overfly));
113 memset(gotilist, 0, sizeof(gotilist));
114 memset(unfriendly, 0, sizeof(unfriendly));
115 for (cn = 1; cn < MAXNOC; cn++) {
116 if ((mynatp = getnatp(cn)) == 0)
118 rel = getrel(mynatp, plane_owner);
121 if (plane_owner == cn)
125 if (mission_flags & PM_R) {
126 if (mission_flags & P_S) {
127 PR(plane_owner, "\nSPY Plane report\n");
130 } else if (mission_flags & P_A) {
131 PR(plane_owner, "\nAnti-Sub Patrol report\n");
133 PR(plane_owner, "\nReconnaissance report\n");
138 pln_removedupes(bomb_list, esc_list);
139 while ((dir = mypath[myp++]) && !QEMPTY(bomb_list)) {
140 if ((val = diridx(dir)) == DIR_STOP)
142 /* XXX using xnorm is probably bad */
143 x = xnorm(x + diroff[val][0]);
144 y = ynorm(y + diroff[val][1]);
145 getsect(x, y, §);
146 over = getnatp(sect.sct_own);
148 if (mission_flags & PM_R) {
150 setcont(plane_owner, sect.sct_own, FOUND_FLY);
151 if (sect.sct_type == SCT_WATER) {
152 PR(plane_owner, "flying over %s at %s\n",
153 dchr[sect.sct_type].d_name, xyas(x, y, plane_owner));
154 if (mission_flags & PM_S)
155 plane_sweep(bomb_list, x, y);
156 if (mission_flags & P_A) {
157 plane_sona(bomb_list, x, y, &head);
159 changed += map_set(plane_owner,
160 sect.sct_x, sect.sct_y,
161 dchr[sect.sct_type].d_mnem, 0);
162 } else if (mission_flags & P_S) {
163 satdisp_sect(§, (mission_flags & P_I) ? 10 : 50);
165 /* This is borrowed from lookout */
166 if (sect.sct_own == plane_owner)
167 PR(plane_owner, "Your ");
169 PR(plane_owner, "%s (#%d) ",
170 cname(sect.sct_own), sect.sct_own);
171 PR(plane_owner, "%s", dchr[sect.sct_type].d_name);
172 changed += map_set(plane_owner,
173 sect.sct_x, sect.sct_y,
174 dchr[sect.sct_type].d_mnem, 0);
175 PR(plane_owner, " %d%% efficient ",
176 (sect.sct_own == plane_owner) ?
177 sect.sct_effic : roundintby((int)sect.sct_effic, 25));
178 civ = sect.sct_item[I_CIVIL];
179 mil = sect.sct_item[I_MILIT];
181 PR(plane_owner, "with %s%d civ ",
182 (sect.sct_own == plane_owner) ?
184 (sect.sct_own == plane_owner) ?
185 civ : roundintby(civ, 25));
187 PR(plane_owner, "with %s%d mil ",
188 (sect.sct_own == plane_owner) ?
190 (sect.sct_own == plane_owner) ?
191 mil : roundintby(mil, 25));
192 PR(plane_owner, "@ %s\n", xyas(x, y, plane_owner));
194 if (mission_flags & P_S)
195 satdisp_units(sect.sct_x, sect.sct_y);
197 PR(plane_owner, "flying over %s at %s\n",
198 dchr[sect.sct_type].d_name, xyas(x, y, plane_owner));
199 changed += map_set(plane_owner, sect.sct_x, sect.sct_y,
200 dchr[sect.sct_type].d_mnem, 0);
202 if ((rel = getrel(over, plane_owner)) == ALLIED)
205 evaded = do_evade(bomb_list, esc_list);
207 if (sect.sct_own != 0 && sect.sct_own != plane_owner && !evaded) {
208 /* We only show planes overhead if they didn't
210 overfly[sect.sct_own]++;
211 PR(sect.sct_own, "%s planes spotted over %s\n",
212 cname(plane_owner), xyas(x, y, sect.sct_own));
214 setcont(cn, plane_owner, FOUND_FLY);
219 if (unfriendly[sect.sct_own])
220 ac_doflak(bomb_list, §);
221 /* If bombers left, fire flak from units and ships */
222 if (!QEMPTY(bomb_list))
223 ac_landflak(bomb_list, x, y);
224 if (!QEMPTY(bomb_list))
225 ac_shipflak(bomb_list, x, y);
227 /* mission planes aborted due to flak -- don't send escorts */
228 if (QEMPTY(bomb_list))
230 if (!no_air_defense && !evaded)
231 air_defense(x, y, plane_owner, bomb_list, esc_list);
233 if (sect.sct_own == 0 || sect.sct_own == plane_owner)
240 for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw) {
241 struct plist *ip = (struct plist *)qp;
242 if (!(plchr[(int)ip->plane.pln_type].pl_flags & P_M))
249 if (unfriendly[sect.sct_own] && !gotilist[sect.sct_own]) {
250 getilist(&ilist[sect.sct_own], sect.sct_own,
251 bomb_list, esc_list, obomb, oesc);
252 gotilist[sect.sct_own]++;
256 ac_intercept(bomb_list, esc_list, &ilist[sect.sct_own],
258 intown = sect.sct_own;
261 /* Let's report all of the overflights even if aborted */
262 for (cn = 1; cn < MAXNOC; cn++) {
263 if (plane_owner == cn)
266 nreport(plane_owner, N_OVFLY_SECT, cn, overfly[cn]);
268 /* If the map changed, update it */
270 writemap(player->cnum);
271 /* Now, if the bomber and escort lists are empty, we are done */
272 if (QEMPTY(bomb_list) && QEMPTY(esc_list))
275 /* Something made it through */
276 /* Go figure out if there are ships in this sector, and who's they are */
277 memset(nats, 0, sizeof(nats));
278 snxtitem_xy(&ni, EF_SHIP, x, y);
279 while (nxtitem(&ni, &ship)) {
280 if (mchr[(int)ship.shp_type].m_flags & M_SUB)
282 nats[ship.shp_own]++;
284 /* Go figure out if there are units in this sector, and who's they are */
285 memset(lnats, 0, sizeof(lnats));
286 snxtitem_xy(&ni, EF_LAND, x, y);
287 while (nxtitem(&ni, &land)) {
288 if (land.lnd_ship >= 0 || land.lnd_land >= 0)
290 lnats[land.lnd_own]++;
293 /* Now, let's make life a little rougher. */
294 for (cn = 1; cn < MAXNOC && !QEMPTY(bomb_list); cn++) {
295 if (plane_owner == cn)
298 /* Are there ships owned by this country? */
302 PR(cn, "%s planes spotted over ships in %s\n",
303 cname(plane_owner), xyas(x, y, cn));
305 setcont(cn, plane_owner, FOUND_FLY);
307 if (unfriendly[cn]) {
308 /* They are unfriendly too */
310 getilist(&ilist[cn], cn, bomb_list, esc_list, obomb,
314 PR(plane_owner, "Flying over %s ships in %s\n",
315 cname(cn), xyas(x, y, plane_owner));
316 /* This makes going for ships in harbors tough */
318 /* We already fired flak up above. Now we intercept again if we haven't already */
319 /* Flag that we intercepted */
321 /* And now intercept again */
322 ac_intercept(bomb_list, esc_list, &ilist[cn],
327 /* Are there units owned by this country? */
328 if (lnats[cn] != 0) {
331 PR(cn, "%s planes spotted over land units in %s\n",
332 cname(plane_owner), xyas(x, y, cn));
334 setcont(cn, plane_owner, FOUND_FLY);
336 if (unfriendly[cn]) {
337 /* They are unfriendly too */
339 getilist(&ilist[cn], cn, bomb_list, esc_list, obomb,
343 PR(plane_owner, "Flying over %s land units in %s\n",
344 cname(cn), xyas(x, y, plane_owner));
347 /* We haven't intercepted yet, so intercept */
348 ac_intercept(bomb_list, esc_list, &ilist[cn],
356 if (mission_flags & P_A)
357 free_shiplist(&head);
358 for (cn = 1; cn < MAXNOC; cn++) {
365 count_non_missiles(struct emp_qelem *list)
367 struct emp_qelem *qp;
371 /* don't intercept missiles */
372 for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
373 plp = (struct plist *)qp;
374 if (!(plp->pcp->pl_flags & P_M))
381 sam_intercept(struct emp_qelem *att_list, struct emp_qelem *def_list,
382 natid def_own, natid plane_owner, coord x, coord y,
385 struct emp_qelem *aqp;
386 struct emp_qelem *anext;
387 struct emp_qelem *dqp;
388 struct emp_qelem *dnext;
393 for (aqp = att_list->q_forw,
394 dqp = def_list->q_forw;
395 aqp != att_list && dqp != def_list; aqp = anext) {
397 aplp = (struct plist *)aqp;
398 if (aplp->pcp->pl_flags & P_M)
400 if (aplp->pcp->pl_cost < 1000)
402 for (; dqp != def_list; dqp = dnext) {
404 dplp = (struct plist *)dqp;
405 if (!(dplp->pcp->pl_flags & P_M))
408 if (dplp->plane.pln_range <
409 mapdist(x, y, dplp->plane.pln_x, dplp->plane.pln_y)) {
414 if (mission_pln_equip(dplp, 0, P_F, 0) < 0) {
421 PR(plane_owner, "%s launches SAMs!\n", cname(def_own));
422 PR(def_own, "Launching SAMs at %s planes!\n",
424 ac_combat_headers(plane_owner, def_own);
432 PR(plane_owner, "\n");
435 if (delete_missiles) {
436 for (; dqp != def_list; dqp = dnext) {
438 dplp = (struct plist *)dqp;
439 if (!(dplp->pcp->pl_flags & P_M))
449 ac_intercept(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
450 struct emp_qelem *def_list, natid def_own, coord x, coord y)
455 struct emp_qelem *next;
456 struct emp_qelem *qp;
457 struct emp_qelem int_list;
462 plp = (struct plist *)bomb_list->q_forw;
463 plane_owner = plp->plane.pln_own;
467 sam_intercept(bomb_list, def_list, def_own, plane_owner, x, y, 0);
468 sam_intercept(esc_list, def_list, def_own, plane_owner, x, y, 1);
469 if (!(att_count = count_non_missiles(bomb_list) +
470 count_non_missiles(esc_list)))
473 emp_initque(&int_list);
474 for (qp = def_list->q_forw; qp != def_list; qp = next) {
476 plp = (struct plist *)qp;
478 /* SAMs interdict separately */
479 if (plp->pcp->pl_flags & P_M)
481 dist = mapdist(x, y, pp->pln_x, pp->pln_y) * 2;
482 if (pp->pln_range < dist)
484 if (mission_pln_equip(plp, 0, P_F, 0) < 0) {
489 /* got one; delete from def_list, add to int_list */
491 emp_insque(qp, &int_list);
492 pp->pln_mobil -= pln_mobcost(dist, pp, P_F);
493 putplane(pp->pln_uid, pp);
495 if (icount > att_count)
500 PR(plane_owner, "%d %s fighter%s rising to intercept!\n",
501 icount, cname(def_own), icount == 1 ? " is" : "s are");
502 PR(def_own, "%d fighter%s intercepting %s planes!\n",
503 icount, icount == 1 ? " is" : "s are", cname(plane_owner));
504 ac_combat_headers(plane_owner, def_own);
505 ac_airtoair(esc_list, &int_list);
506 ac_airtoair(bomb_list, &int_list);
507 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 att = pln_att(&ap->plane);
630 att = pln_def(&ap->plane);
631 att = att * ap->plane.pln_effic / 100;
632 att = MAX(att, ap->pcp->pl_def / 2);
634 def = pln_def(&dp->plane) * dp->plane.pln_effic / 100;
635 def = MAX(def, dp->pcp->pl_def / 2);
637 if ((ap->pcp->pl_flags & P_F) && ap->bombs != 0)
639 if ((dp->pcp->pl_flags & P_F) && dp->bombs != 0)
641 att += ap->pcp->pl_stealth / 25.0;
642 def += dp->pcp->pl_stealth / 25.0;
651 odds = ((double)att / ((double)def + (double)att));
654 intensity = roll(20) + roll(20) + roll(20) + roll(20) + 1;
656 PR(att_own, " %3d/%-3d %3d %3.2f ", att, def, intensity, odds);
657 PR(def_own, " %3d/%-3d %3d %3.2f ", def, att, intensity, odds);
661 while ((intensity--) > 0) {
665 if ((dp->plane.pln_effic - ddam) < PLANE_MINEFF)
669 if ((ap->plane.pln_effic - adam) < PLANE_MINEFF)
674 if (dp->pcp->pl_flags & P_M)
677 PR(att_own, "%3d/%-3d", adam, ddam);
678 PR(def_own, "%3d/%-3d", ddam, adam);
679 ac_planedamage(ap, def_own, adam, def_own, 1, 0, mesg);
680 strncpy(temp, mesg, 14);
681 ac_planedamage(dp, att_own, ddam, att_own, 1, 0, mesg);
682 PR(att_own, "%-13.13s %-13.13s\n", temp, mesg);
683 PR(def_own, "%-13.13s %-13.13s\n", mesg, temp);
686 setcont(att_own, def_own, FOUND_FLY);
687 setcont(def_own, att_own, FOUND_FLY);
692 * zap plane associated with plp.
693 * Damaging country is "from", damage is "dam".
694 * def_own is the country on the other side of the conflict from the plane
695 * owner. The only time def_own != from is when the interceptor is getting
698 * NOTE: This routine removes the appropriate plane element from the
699 * queue if it gets destroyed. That means that the caller must assume
700 * that the current queue pointer is invalid on return from the ac_planedamage
701 * call. (this has caused bugs in the past)
704 ac_planedamage(struct plist *plp, natid from, int dam, natid other,
705 int checkabort, int show, char *mesg)
715 plane_owner = pp->pln_own;
717 sprintf(dmess, " no damage");
722 memset(dmess, 0, sizeof(dmess));
726 if (eff < PLANE_MINEFF) {
727 sprintf(dmess, " shot down");
729 } else if (eff < 80 && chance((80 - eff) / 100.0) && checkabort) {
730 sprintf(dmess, " aborted @%2d%%", eff);
732 } else if (show == 0) {
733 sprintf(dmess, " cleared");
736 if ((plp->pcp->pl_flags & P_M) == 0) {
738 PR(plane_owner, " %s %s takes %d%s.\n",
739 cname(pp->pln_own), prplane(pp), dam, dmess);
741 PR(other, " %s %s takes %d%s.\n",
742 cname(pp->pln_own), prplane(pp), dam, dmess);
745 if (show && checkabort == 1) {
746 PR(plane_owner, "\n");
752 pp->pln_mobil -= MIN(32 + pp->pln_mobil, dam / 2);
754 if (disp == 1 && from != 0 && (plp->pcp->pl_flags & P_M) == 0)
755 nreport(from, N_DOWN_PLANE, pp->pln_own, 1);
758 putplane(pp->pln_uid, pp);
763 ac_doflak(struct emp_qelem *list, struct sctstr *from)
770 plp = (struct plist *)list->q_forw;
771 plane_owner = plp->plane.pln_own;
773 gun = MIN(FLAK_GUN_MAX, from->sct_item[I_GUN]);
774 shell = from->sct_item[I_SHELL];
775 if (gun > shell * 2) {
776 shell += supply_commod(from->sct_own, from->sct_x, from->sct_y,
777 I_SHELL, (gun + 1) / 2 - shell);
778 from->sct_item[I_SHELL] = shell;
784 gun = roundavg(tfact(from->sct_own, 2.0 * gun));
786 PR(plane_owner, "firing %d flak guns in %s...\n",
787 gun, xyas(from->sct_x, from->sct_y, plane_owner));
788 if (from->sct_own != 0)
789 PR(from->sct_own, "firing %d flak guns in %s...\n",
790 gun, xyas(from->sct_x, from->sct_y, from->sct_own));
791 ac_fireflak(list, from->sct_own, gun);
796 ac_shipflak(struct emp_qelem *list, coord x, coord y)
801 double flak, total, ngun;
809 plp = (struct plist *)list->q_forw;
810 plane_owner = plp->plane.pln_own;
812 memset(nats, 0, sizeof(nats));
814 snxtitem_xy(&ni, EF_SHIP, x, y);
815 while (!QEMPTY(list) && nxtitem(&ni, &ship)) {
816 if (ship.shp_own == 0 || ship.shp_own == plane_owner)
818 mcp = &mchr[(int)ship.shp_type];
819 if (mcp->m_flags & M_SUB)
821 rel = getrel(getnatp(ship.shp_own), plane_owner);
825 gun = shp_usable_guns(&ship);
827 shell = ship.shp_item[I_SHELL];
829 shell = supply_commod(ship.shp_own, ship.shp_x, ship.shp_y,
831 ship.shp_item[I_SHELL] = shell;
832 putship(ship.shp_uid, &ship);
835 if (gun == 0 || shell == 0)
837 flak = gun * (ship.shp_effic / 100.0);
839 total += techfact(ship.shp_tech, flak * 2.0);
841 if (!nats[ship.shp_own]) {
842 /* First time here, print the message */
843 PR(ship.shp_own, "%s planes spotted over ships in %s\n",
844 cname(plane_owner), xyas(x, y, ship.shp_own));
845 PR(plane_owner, "Flying over %s ships in %s\n",
846 cname(ship.shp_own), xyas(x, y, plane_owner));
847 nats[ship.shp_own] = 1;
849 PR(ship.shp_own, "firing %.0f flak guns from %s...\n",
850 flak, prship(&ship));
854 /* Limit to FLAK_GUN_MAX guns of average tech factor */
855 if (ngun > FLAK_GUN_MAX)
856 total *= FLAK_GUN_MAX / ngun;
858 gun = roundavg(total);
860 PR(plane_owner, "Flak! Ships firing %d flak guns...\n", gun);
861 ac_fireflak(list, from, gun);
866 ac_landflak(struct emp_qelem *list, coord x, coord y)
871 double flak, total, ngun;
879 plp = (struct plist *)list->q_forw;
880 plane_owner = plp->plane.pln_own;
882 memset(nats, 0, sizeof(nats));
884 snxtitem_xy(&ni, EF_LAND, x, y);
885 while (!QEMPTY(list) && nxtitem(&ni, &land)) {
886 if (land.lnd_own == 0 || land.lnd_own == plane_owner)
888 lcp = &lchr[(int)land.lnd_type];
889 aaf = lnd_aaf(&land);
890 if ((lcp->l_flags & L_FLAK) == 0 || aaf == 0)
892 if (land.lnd_ship >= 0 || land.lnd_land >= 0)
894 rel = getrel(getnatp(land.lnd_own), plane_owner);
897 flak = aaf * 1.5 * land.lnd_effic / 100.0;
899 total += techfact(land.lnd_tech, flak * 2.0);
901 if (!nats[land.lnd_own]) {
902 /* First time here, print the message */
903 PR(land.lnd_own, "%s planes spotted over land units in %s\n",
904 cname(plane_owner), xyas(x, y, land.lnd_own));
905 PR(plane_owner, "Flying over %s land units in %s\n",
906 cname(land.lnd_own), xyas(x, y, plane_owner));
907 nats[land.lnd_own] = 1;
909 PR(land.lnd_own, "firing flak guns from unit %s (aa rating %d)\n",
914 /* Limit to FLAK_GUN_MAX guns of average tech factor */
915 if (ngun > FLAK_GUN_MAX)
916 total *= FLAK_GUN_MAX / ngun;
918 gun = roundavg(total);
920 PR(plane_owner, "Flak! Land units firing %d flak guns...\n", gun);
921 ac_fireflak(list, from, gun);
926 * Called from shipflak, landflak, and doflak.
929 ac_fireflak(struct emp_qelem *list, natid from, int guns)
933 struct emp_qelem *qp;
934 struct emp_qelem *next;
937 plp = (struct plist *)list->q_forw;
939 for (qp = list->q_forw; qp != list; qp = next) {
941 plp = (struct plist *)qp;
942 n = ac_flak_dam(guns, pln_def(&plp->plane), plp->pcp->pl_flags);
943 ac_planedamage(plp, from, n, 0, 2, 1, msg);
948 * Calculate flak damage
951 ac_flak_dam(int guns, int def, int pl_flags)
955 /* <-7 -7 -6 -5 -4 */
956 static float flaktable[18] = { 0.132f, 0.20f, 0.20f, 0.25f, 0.30f,
957 /* -3 -2 -1 0 +1 +2 +3 +4 */
958 0.35f, 0.40f, 0.45f, 0.50f, 0.50f, 0.55f, 0.60f, 0.65f,
959 /* +5 +6 +7 +8 >+8 */
960 0.70f,0.75f, 0.80f, 0.85f, 1.1305f };
961 enum { FLAK_MAX = sizeof(flaktable)/sizeof(flaktable[0]) - 1 };
964 if ((pl_flags & P_T) == 0)
972 mult = flaktable[FLAK_MAX];
977 mult = flaktable[flak];
980 dam = (int)((roll(8) + 2) * mult);
987 * See if this plane is flying in this list
990 ac_isflying(struct plnstr *plane, struct emp_qelem *list)
992 struct emp_qelem *qp;
993 struct emp_qelem *next;
999 for (qp = list->q_forw; qp != list; qp = next) {
1001 plp = (struct plist *)qp;
1003 if (plane->pln_uid == pp->pln_uid)
1011 * Get a list of planes available for interception duties.
1014 getilist(struct emp_qelem *list, natid own, struct emp_qelem *a,
1015 struct emp_qelem *b, struct emp_qelem *c, struct emp_qelem *d)
1017 struct plchrstr *pcp;
1018 struct plnstr plane;
1019 struct nstr_item ni;
1023 snxtitem_all(&ni, EF_PLANE);
1024 while (nxtitem(&ni, &plane)) {
1025 if (plane.pln_own != own)
1027 pcp = &plchr[(int)plane.pln_type];
1028 if ((pcp->pl_flags & P_F) == 0)
1030 if (plane.pln_mission != 0)
1032 if (plane.pln_mobil <= 0)
1034 if (plane.pln_effic < 40)
1036 if (!pln_airbase_ok(&plane, 0, 0))
1038 /* Finally, is it in the list of planes already in
1040 if (ac_isflying(&plane, a))
1042 if (ac_isflying(&plane, b))
1044 if (ac_isflying(&plane, c))
1046 if (ac_isflying(&plane, d))
1049 ip = malloc(sizeof(*ip));
1052 ip->pcp = &plchr[(int)plane.pln_type];
1054 emp_insque(&ip->queue, list);
1059 do_evade(struct emp_qelem *bomb_list, struct emp_qelem *esc_list)
1061 struct emp_qelem *qp;
1066 for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw) {
1067 plp = (struct plist *)qp;
1068 if (evade > plp->pcp->pl_stealth / 100.0)
1069 evade = plp->pcp->pl_stealth / 100.0;
1071 for (qp = esc_list->q_forw; qp != esc_list; qp = qp->q_forw) {
1072 plp = (struct plist *)qp;
1073 if (evade > plp->pcp->pl_stealth / 100.0)
1074 evade = plp->pcp->pl_stealth / 100.0;