git.pond.sub.org Git - empserver/blob - src/lib/commands/payo.c

   1 /*
   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
   5  *
   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.
  10  *
  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.
  15  *
  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
  19  *
  20  *  ---
  21  *
  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.
  25  *
  26  *  ---
  27  *
  28  *  payo.c: Calculate trade ship payoffs
  29  *
  30  *  Known contributors to this file:
  31  *     Thomas Ruschak, 1992
  32  */
  33
  34 #include "misc.h"
  35 #include "player.h"
  36 #include "var.h"
  37 #include "xy.h"
  38 #include "sect.h"
  39 #include "ship.h"
  40 #include "nat.h"
  41 #include "nsc.h"
  42 #include "deity.h"
  43 #include "file.h"
  44 #include "commands.h"
  45 #include "optlist.h"
  46
  47 int
  48 payo(void)
  49 {
  50         struct  sctstr sect;
  51         int     nships;
  52         struct  nstr_item ni;
  53         struct  shpstr ship;
  54         struct  mchrstr *mp;
  55         int     dist;
  56         float   cash=0.0;
  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 */
  64
  65
  66         if (!opt_TRADESHIPS) {
  67             pr("Tradeships are not enabled.\n");
  68             return RET_FAIL;
  69         }
  70         if (!snxtitem(&ni, EF_SHIP, player->argp[1]))
  71                 return RET_SYN;
  72
  73         nships = 0;
  74         while (nxtitem(&ni, (s_char *)&ship)) {
  75                 if (!player->owner || ship.shp_own == 0)
  76                         continue;
  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);
  80                         continue;
  81                 }
  82                 mp = &mchr[(int)ship.shp_type];
  83
  84                 if (!(mp->m_flags & M_TRADE))
  85                         continue;
  86
  87                 if (nships++ == 0) {
  88                         if (player->god)
  89                                 pr("own ");
  90                         pr("shp#     ship type  orig x,y       x,y    dist $$\n");
  91                 }
  92                 if (player->god)
  93                         pr("%3d ", ship.shp_own);
  94                 pr("%4d ", ni.cur);
  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);
  99
 100                 getsect(ship.shp_x,ship.shp_y,&sect);
 101
 102                 dist = mapdist(ship.shp_x, ship.shp_y,
 103                         ship.shp_orig_x, ship.shp_orig_y);
 104                 pr("%4d ", dist);
 105
 106                 if (dist < trade_1_dist)
 107                         cash = 0;
 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));
 112                 else
 113                         cash = (1.0 + trade_3*((float)dist));
 114
 115                 cash *= mp->m_cost;
 116                 cash *= (((float)ship.shp_effic) / 100.0);
 117
 118                 if (sect.sct_own && (sect.sct_own != ship.shp_own))
 119                         cash *= (1.0 + trade_ally_bonus);
 120                 pr("$%6.2f\n",cash);
 121         }
 122         if (nships == 0) {
 123                 if (player->argp[1])
 124                         pr("%s: No ship(s)\n", player->argp[1]);
 125                 else
 126                         pr("%s: No ship(s)\n", "");
 127                 return RET_FAIL;
 128         }else
 129                 pr("%d ship%s\n", nships, splur(nships));
 130         return RET_OK;
 131 }