2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2016, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
6 * Empire 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 3 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, see <http://www.gnu.org/licenses/>.
21 * See files README, COPYING and CREDITS in the root of the source
22 * tree for related information and legal notices. It is expected
23 * that future projects/authors will amend these files as needed.
27 * bridgefall.c: Knock a bridge down
29 * Known contributors to this file:
31 * Markus Armbruster, 2004-2014
44 #include "prototypes.h"
48 static void knockdown(struct sctstr *);
51 * Is there support for a bridge at @sp?
52 * Ignore support coming from direction @ignore_dir.
55 bridge_support_at(struct sctstr *sp, int ignore_dir)
60 for (i = 1; i <= 6; i++) {
63 nx = sp->sct_x + diroff[i][0];
64 ny = sp->sct_y + diroff[i][1];
65 getsect(nx, ny, §);
67 && sect.sct_type != SCT_WATER && sect.sct_type != SCT_BSPAN)
69 if (sect.sct_effic < SCT_MINEFF)
71 if (sect.sct_type == SCT_BHEAD && sect.sct_newtype == SCT_BHEAD)
73 if (sect.sct_type == SCT_BTOWER)
80 * Check bridges at and around @sp after damage to @sp.
81 * If @sp is an inefficent bridge, splash it.
82 * If @sp can't support a bridge, splash unsupported adjacent bridges.
83 * Write back splashed bridges, except for @sp; writing that one is
87 bridge_damaged(struct sctstr *sp)
91 if (sp->sct_effic >= SCT_MINEFF)
95 if (des == SCT_BSPAN || des == SCT_BTOWER)
97 if ((des == SCT_BHEAD && !opt_EASY_BRIDGES) || des == SCT_BTOWER)
102 bridgefall(struct sctstr *sp)
109 for (i = 1; i <= 6; i++) {
110 nx = sp->sct_x + diroff[i][0];
111 ny = sp->sct_y + diroff[i][1];
112 getsect(nx, ny, §);
113 if (sect.sct_type == SCT_BSPAN
114 && !bridge_support_at(§, DIR_BACK(i))) {
121 /* Knock down a bridge span. Note that this does NOT write the
122 * sector out to the database, it's up to the caller to do that. */
124 knockdown(struct sctstr *sp)
132 "Crumble... SCREEEECH! Splash! Bridge%s falls at %s!\n",
133 sp->sct_type == SCT_BTOWER ? " tower" : "",
134 xyas(sp->sct_x, sp->sct_y, sp->sct_own));
135 if (!SCT_MINES_ARE_SEAMINES(sp))
137 sp->sct_type = SCT_WATER;
138 sp->sct_newtype = SCT_WATER;
144 /* Sink all the units */
145 snxtitem_xy(&ni, EF_LAND, sp->sct_x, sp->sct_y);
146 while (nxtitem(&ni, &land)) {
147 if (land.lnd_own == 0)
149 if (land.lnd_ship >= 0)
151 mpr(land.lnd_own, " AARGH! %s tumbles to its doom!\n",
154 putland(land.lnd_uid, &land);
156 /* Sink all the planes */
157 snxtitem_xy(&ni, EF_PLANE, sp->sct_x, sp->sct_y);
158 while (nxtitem(&ni, &plane)) {
159 if (plane.pln_own == 0)
161 if (plane.pln_flags & PLN_LAUNCHED)
163 if (plane.pln_ship >= 0)
165 mpr(plane.pln_own, " AARGH! %s tumbles to its doom!\n",
168 putplane(plane.pln_uid, &plane);
170 /* Sink all the nukes */
171 snxtitem_xy(&ni, EF_NUKE, sp->sct_x, sp->sct_y);
172 while (nxtitem(&ni, &nuke)) {
173 if (nuke.nuk_own == 0)
175 if (nuke.nuk_plane >= 0)
177 mpr(nuke.nuk_own, " %s sinks to the bottom of the sea!\n",
180 putnuke(nuke.nuk_uid, &nuke);
182 memset(sp->sct_item, 0, sizeof(sp->sct_item));
183 memset(sp->sct_del, 0, sizeof(sp->sct_del));
184 memset(sp->sct_dist, 0, sizeof(sp->sct_dist));
185 sp->sct_pstage = PLG_HEALTHY;
188 sp->sct_che_target = 0;