274 lines
6.1 KiB
C
274 lines
6.1 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2005, 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 <config.h>
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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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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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* Map direction DIR to a direction index DIR_STOP..DIR_LAST.
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* DIR must be a valid direction.
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*/
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int
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diridx(char dir)
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{
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unsigned i = dir - 'a';
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if (CANT_HAPPEN(i >= sizeof(dirindex) / sizeof(*dirindex)
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|| dirindex[i] < 0))
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return DIR_STOP;
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return dirindex[i];
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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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char *
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getpath(char *buf, char *arg, coord x, coord y, int onlyown,
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int showdes, int destinations)
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{
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char buf2[1024];
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char *p = buf;
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char *bp;
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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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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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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 = NULL;
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if (destinations == P_NONE) {
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pr("Destination sectors not allowed here!\n");
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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(buf2, §, &dsect,
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&mv_cost, MOB_ROAD);
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} else if (destinations == P_FLYING) {
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bp = BestAirPath(buf2, 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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}
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if (bp && p + strlen(bp) + 1 < buf + MAX_PATH_LEN) {
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strcpy(p, 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(dx, dy, player->cnum));
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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\n", NULL, NULL);
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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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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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++p;
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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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bp = getstring(prompt, buf2);
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if (bp && p + strlen(bp) + 1 >= 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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bp = NULL;
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}
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if (!bp)
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return NULL;
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strcpy(p, bp);
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if (*bp)
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goto more;
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return buf;
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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,
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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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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 = diridx(*pp)) == DIR_STOP)
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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, &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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void
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pathrange(coord cx, coord cy, 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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for (; *pp; pp++) {
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dir = diridx(*pp);
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if (dir == DIR_STOP)
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break;
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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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