2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2009, 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 * move.c: Misc. move routines
30 * Known contributors to this file:
31 * Markus Armbruster, 2006
45 sector_mcost(struct sctstr *sp, int mobtype)
49 base = dchr[sp->sct_type].d_mob0;
53 if (mobtype == MOB_RAIL && opt_RAILWAYS) {
54 if (!SCT_HAS_RAIL(sp))
59 /* linear function in eff, d_mob0 at 0%, d_mob1 at 100% */
60 base += (dchr[sp->sct_type].d_mob1 - base) * sp->sct_effic / 100;
61 if (CANT_HAPPEN(base < 0))
64 if (mobtype == MOB_MOVE || mobtype == MOB_MARCH) {
65 /* linear function in road, base at 0%, base/10 at 100% */
67 if (intrchr[INT_ROAD].in_enable)
68 cost -= base * 0.009 * sp->sct_road;
69 } else if (mobtype == MOB_RAIL) {
70 if (!intrchr[INT_RAIL].in_enable || sp->sct_rail <= 0)
72 /* linear function in rail, base at 0%, base/100 at 100% */
73 cost = base - base * 0.0099 * sp->sct_rail;
78 if (CANT_HAPPEN(cost < 0))
81 if (mobtype == MOB_MOVE)
82 return MAX(cost, 0.001);
83 if (sp->sct_own != sp->sct_oldown && sp->sct_mobil <= 0)
84 /* slow down land units in newly taken sectors */
86 return MAX(cost, 0.02);
90 speed_factor(double effspd, int tech)
92 return 480.0 / (effspd + techfact(tech, effspd));
95 /* Minimal efficiency for railway and railway extension (opt_RAILWAYS) */
96 #define SCT_RAIL_EFF 5
97 #define SCT_RAIL_EXT_EFF 60
99 /* Is sector SP a railway? */
100 #define SCT_IS_RAILWAY(sp) \
101 (dchr[(sp)->sct_type].d_mob1 == 0 && (sp)->sct_effic >= SCT_RAIL_EFF)
102 /* May sector SP have a railway extension? */
103 #define SCT_MAY_HAVE_RAIL_EXT(sp) \
104 ((sp)->sct_effic >= SCT_RAIL_EXT_EFF)
105 /* Does railway sector SP extend railway track into sector TOSP? */
106 #define SCT_EXTENDS_RAIL(sp, tosp) \
107 ((sp)->sct_own == (tosp)->sct_own && SCT_MAY_HAVE_RAIL_EXT(tosp))
110 sct_rail_track(struct sctstr *sp)
115 res = !!SCT_IS_RAILWAY(sp);
116 for (i = DIR_FIRST; i <= DIR_LAST; i++) {
117 nsp = getsectp(sp->sct_x + diroff[i][0],
118 sp->sct_y + diroff[i][1]);
119 if (SCT_IS_RAILWAY(nsp) && SCT_EXTENDS_RAIL(nsp, sp))