Import of Empire 4.2.12
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src/lib/subs/paths.c
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332
src/lib/subs/paths.c
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/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ---
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*
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* See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
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* related information and legal notices. It is expected that any future
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* projects/authors will amend these files as needed.
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*
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* ---
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*
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* path.c: Routines associated with paths, directions, etc.
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*
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* Known contributors to this file:
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*
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*/
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#include "misc.h"
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#include "player.h"
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#include "xy.h"
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#include "path.h"
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#include "nat.h"
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#include "sect.h"
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#include "file.h"
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#include "prototypes.h"
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int
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getdir(s_char *prompt, s_char *stop_msg, s_char *view_msg, s_char *bomb_msg)
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{
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register int max_dir;
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register int min_dir;
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register int dir_num;
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s_char buf[1024];
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if (stop_msg != 0)
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min_dir = DIR_STOP;
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else
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min_dir = DIR_FIRST;
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if (view_msg == 0)
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max_dir = DIR_LAST;
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else
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max_dir = DIR_VIEW;
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while (1) {
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if (getstring(prompt, buf) == 0 || *buf == 0)
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return -1;
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dir_num = chkdir(buf[0], min_dir, max_dir);
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if (dir_num >= min_dir)
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break;
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direrr(stop_msg, view_msg, bomb_msg);
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}
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return dir_num;
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}
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int
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chkdir(s_char dir_char, int min_dir, int max_dir)
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{
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register int i;
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for (i = min_dir; i <= max_dir; i++)
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if (dir_char == dirch[i])
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return i;
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return -1;
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}
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void
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direrr(s_char *stop_msg, s_char *view_msg, s_char *map_msg)
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{
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pr("Legal directions are:\n");
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pr(" %c %c\n", dirch[DIR_UL], dirch[DIR_UR]);
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pr("%c %c\n", dirch[DIR_L], dirch[DIR_R]);
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pr(" %c %c\n", dirch[DIR_DL], dirch[DIR_DR]);
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if (stop_msg != 0)
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pr(stop_msg, dirch[DIR_STOP]);
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if (view_msg != 0)
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pr(view_msg, dirch[DIR_VIEW]);
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if (map_msg != 0)
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pr(map_msg, dirch[DIR_MAP]);
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}
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/*
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* return pointer to path; prompt user until a stop char
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* or a bomb char have been entered. A "bomb" char in
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* this context is actually "execute" for the partial
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* move commands, and isn't valid for those commands
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* which do not accept partial moves.
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*/
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s_char *
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getpath(s_char *buf, s_char *arg, coord x, coord y, int onlyown, int showdes, int showxy, int destinations)
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{
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s_char *p = buf;
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s_char *bp;
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s_char prompt[128];
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coord dx, dy;
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struct sctstr sect, dsect;
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coord nx, ny;
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int dir;
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s_char *execute;
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double mv_cost;
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if (arg) {
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strncpy(buf, arg, MAX_PATH_LEN - 1);
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buf[MAX_PATH_LEN - 1] = 0;
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} else {
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*p = 0;
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}
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if (showxy)
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execute = " & '%c' to execute\n";
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else
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execute = "\n";
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getsect(x,y,§);
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nx = x;
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ny = y;
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more:
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while (*p) {
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if (sarg_xy(p, &dx, &dy)) {
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bp = 0;
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if (destinations == P_NONE) {
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pr("Destination sectors not allowed here!\n");
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*p = 0;
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}
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if (getsect(dx,dy,&dsect)) {
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if (destinations == P_WALKING){
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bp=BestLandPath(p, §,&dsect,
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&mv_cost, MOB_ROAD);
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} else if (destinations == P_FLYING) {
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bp=BestAirPath(p, nx, ny, dx, dy);
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}
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} else {
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pr("Invalid destination sector!\n");
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*p = 0;
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}
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if (bp) {
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pr("Using best path '%s'\n", p);
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pr("Using total path '%s'\n", buf);
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return buf;
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} else {
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pr("Can't get to %s from here!\n",
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xyas(nx,ny,player->cnum));
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*p = 0;
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}
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break;
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}
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dir = chkdir(*p, DIR_STOP, DIR_LAST);
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if (dir < 0) {
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pr("\"%c\" is not legal...", *p);
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direrr("'%c' to stop", (s_char *)0, execute);
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*p = 0;
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break;
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}
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nx = x + diroff[dir][0];
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ny = y + diroff[dir][1];
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getsect(nx, ny, §);
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if (onlyown && sect.sct_own != player->cnum) {
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*p = 0;
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pr("You don't own %s; you can't go there!\n",
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xyas(nx, ny, player->cnum));
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break;
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}
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if (dir == DIR_STOP || dir == DIR_MAP) {
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p[1] = 0;
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return buf;
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}
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if (++p - buf == MAX_PATH_LEN) {
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pr("Path length may not exceed %d.\n", MAX_PATH_LEN);
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pr("Aborting...\n");
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*buf = 0;
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return buf;
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}
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x = nx;
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y = ny;
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}
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fly_map(x,y);
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if (showdes) {
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getsect(x, y, §);
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sprintf(prompt, "<%c: %s> ", dchr[sect.sct_type].d_mnem,
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xyas(x, y, player->cnum));
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} else {
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sprintf(prompt, "<%d: %s> ", (int)(p - buf),
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xyas(x, y, player->cnum));
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}
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if (!(bp = getstring(prompt, p)) || !*bp) {
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if (player->aborted)
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*buf = 0;
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return buf;
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}
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goto more;
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}
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/* ARGSUSED */
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double
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mcost(struct sctstr *sp, int own)
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{
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return sector_mcost(sp, MOB_ROAD);
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/*
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int m_cost;
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if (!(m_cost = dchr[sp->sct_type].d_mcst))
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return -1.0;
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if (m_cost < 25)
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return (200.0 + (m_cost - 3.0) * sp->sct_effic) / 500.0;
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else
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return (m_cost * 5.0 - (double)sp->sct_effic) / 25.0;
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*/
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}
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/*
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* fly move cost
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*/
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/* ARGSUSED */
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double
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fcost(struct sctstr *sp, natid own)
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{
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return 1.0;
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}
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/*
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* nav move cost
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*/
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/* ARGSUSED */
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double
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ncost(struct sctstr *sp, natid own)
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{
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return 1.0;
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}
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/*
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* return end x,y of path, and the base
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* movement cost it takes to get there.
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*/
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double
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pathtoxy(s_char *path, coord *xp, coord *yp, double (*cost) (struct sctstr *, natid))
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{
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struct sctstr s;
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s_char *pp;
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coord x;
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coord y;
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int val;
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double m;
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int c;
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x = *xp;
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y = *yp;
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m = 0.0;
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for (pp = path; *pp; pp++) {
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if ((val = chkdir(*pp, DIR_STOP, DIR_LAST)) == 0)
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break;
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x += diroff[val][0];
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y += diroff[val][1];
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c = dirch[val];
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if (c == DIR_STOP)
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break;
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if (!getsect(x, y, &s))
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return -1.0;
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m += cost(&s, s.sct_own);
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}
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*xp = xnorm(x);
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*yp = ynorm(y);
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return m;
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}
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/*
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* return true if "who" owns the path starting at x,y
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*/
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int
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chkpath(natid who, s_char *path, coord x, coord y)
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{
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s_char *pp;
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int val;
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struct sctstr sect;
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for (pp = path; *pp; pp++) {
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if ((val = chkdir(*pp, DIR_STOP, DIR_LAST)) == 0)
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break;
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x += diroff[val][0];
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y += diroff[val][1];
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if (!getsect(x, y, §) || sect.sct_own != who)
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return 0;
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}
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return 1;
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}
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void
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pathrange(register coord cx, register coord cy, register s_char *pp, int border, struct range *range)
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{
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int dir;
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range->lx = cx;
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range->hx = cx;
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range->ly = cy;
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range->hy = cy;
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range->width = 0;
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range->height = 0;
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while ((dir = chkdir(*pp, DIR_FIRST, DIR_LAST)) >= 0) {
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pp++;
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cx += diroff[dir][0];
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cy += diroff[dir][1];
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if (cx < range->lx)
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range->lx = cx;
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if (cx > range->hx)
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range->hx = cx;
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if (cy < range->ly)
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range->ly = cy;
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if (cy > range->hy)
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range->hy = cy;
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}
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range->lx = xnorm(range->lx - border*2);
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range->ly = ynorm(range->ly - border);
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range->hx = xnorm(range->hx + border*2 + 1);
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range->hy = ynorm(range->hy + border + 1);
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xysize_range(range);
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}
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