2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2000, 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 the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
23 * related information and legal notices. It is expected that any future
24 * projects/authors will amend these files as needed.
28 * payo.c: Calculate trade ship payoffs
30 * Known contributors to this file:
31 * Thomas Ruschak, 1992
57 extern int trade_1_dist; /* less than this gets no money */
58 extern int trade_2_dist; /* less than this gets trade_1 money */
59 extern int trade_3_dist; /* less than this gets trade_2 money */
60 extern float trade_1; /* return on trade_1 distance */
61 extern float trade_2; /* return on trade_2 distance */
62 extern float trade_3; /* return on trade_3 distance */
63 extern float trade_ally_bonus; /* 20% bonus for trading with allies */
66 if (!opt_TRADESHIPS) {
67 pr("Tradeships are not enabled.\n");
70 if (!snxtitem(&ni, EF_SHIP, player->argp[1]))
74 while (nxtitem(&ni, (s_char *)&ship)) {
75 if (!player->owner || ship.shp_own == 0)
77 if (ship.shp_type < 0 || ship.shp_type > shp_maxno) {
78 pr("bad ship type %d (#%d)\n",
79 ship.shp_type, ni.cur);
82 mp = &mchr[(int)ship.shp_type];
84 if (!(mp->m_flags & M_TRADE))
90 pr("shp# ship type orig x,y x,y dist $$\n");
93 pr("%3d ", ship.shp_own);
95 pr("%-16.16s ", mchr[(int)ship.shp_type].m_name);
96 prxy("%4d,%-4d ", ship.shp_orig_x,
97 ship.shp_orig_y, player->cnum);
98 prxy("%4d,%-4d ", ship.shp_x, ship.shp_y, player->cnum);
100 getsect(ship.shp_x,ship.shp_y,§);
102 dist = mapdist(ship.shp_x, ship.shp_y,
103 ship.shp_orig_x, ship.shp_orig_y);
106 if (dist < trade_1_dist)
108 else if (dist < trade_2_dist)
109 cash = (1.0 + trade_1*((float)dist));
110 else if (dist < trade_3_dist)
111 cash = (1.0 + trade_2*((float)dist));
113 cash = (1.0 + trade_3*((float)dist));
116 cash *= (((float)ship.shp_effic) / 100.0);
118 if (sect.sct_own && (sect.sct_own != ship.shp_own))
119 cash *= (1.0 + trade_ally_bonus);
124 pr("%s: No ship(s)\n", player->argp[1]);
126 pr("%s: No ship(s)\n", "");
129 pr("%d ship%s\n", nships, splur(nships));