2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2017, 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 * move.c: Misc. move routines
29 * Known contributors to this file:
30 * Markus Armbruster, 2006-2008
43 sector_mcost(struct sctstr *sp, int mobtype)
47 base = dchr[sp->sct_type].d_mob0;
51 if (mobtype == MOB_RAIL && opt_RAILWAYS) {
52 if (!SCT_HAS_RAIL(sp))
57 /* linear function in eff, d_mob0 at 0%, d_mob1 at 100% */
58 base += (dchr[sp->sct_type].d_mob1 - base) * sp->sct_effic / 100;
59 if (CANT_HAPPEN(base < 0))
62 if (mobtype == MOB_MOVE || mobtype == MOB_MARCH) {
63 /* linear function in road, base at 0%, base/10 at 100% */
65 if (intrchr[INT_ROAD].in_enable)
66 cost -= base * 0.009 * sp->sct_road;
67 } else if (mobtype == MOB_RAIL) {
68 if (!intrchr[INT_RAIL].in_enable || sp->sct_rail <= 0)
70 /* linear function in rail, base at 0%, base/100 at 100% */
71 cost = base - base * 0.0099 * sp->sct_rail;
76 if (CANT_HAPPEN(cost < 0))
79 if (mobtype == MOB_MOVE)
80 return MAX(cost, 0.001);
81 if (sp->sct_own != sp->sct_oldown && sp->sct_mobil <= 0)
82 /* slow down land units in newly taken sectors */
84 return MAX(cost, 0.02);
88 speed_factor(double effspd, int tech)
90 return 480.0 / (effspd + techfact(tech, effspd));
93 /* Minimal efficiency for railway and railway extension (opt_RAILWAYS) */
94 #define SCT_RAIL_EFF 5
95 #define SCT_RAIL_EXT_EFF 60
97 /* Is sector SP a railway? */
98 #define SCT_IS_RAILWAY(sp) \
99 (dchr[(sp)->sct_type].d_mob1 == 0 && (sp)->sct_effic >= SCT_RAIL_EFF)
100 /* May sector SP have a railway extension? */
101 #define SCT_MAY_HAVE_RAIL_EXT(sp) \
102 ((sp)->sct_effic >= SCT_RAIL_EXT_EFF)
103 /* Does railway sector SP extend railway track into sector TOSP? */
104 #define SCT_EXTENDS_RAIL(sp, tosp) \
105 ((sp)->sct_own == (tosp)->sct_own && SCT_MAY_HAVE_RAIL_EXT(tosp))
108 sct_rail_track(struct sctstr *sp)
113 res = !!SCT_IS_RAILWAY(sp);
114 for (i = DIR_FIRST; i <= DIR_LAST; i++) {
115 nsp = getsectp(sp->sct_x + diroff[i][0],
116 sp->sct_y + diroff[i][1]);
117 if (SCT_IS_RAILWAY(nsp) && SCT_EXTENDS_RAIL(nsp, sp))