117 lines
3 KiB
C
117 lines
3 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2006, 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 files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* coastal.c: Routines to calculate the coastal flag
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*
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* Known contributors to this file:
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* Ron Koenderink, 2005
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*/
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#include <config.h>
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#include "prototypes.h"
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#include "file.h"
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#include "path.h"
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static void
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update_coastal_flag(struct sctstr *sp, struct sctstr *sectp)
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{
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int n;
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struct sctstr sect;
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for (n = 1; n <= 6; n++) { /* Directions */
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getsect(sp->sct_x + diroff[n][0], sp->sct_y + diroff[n][1], §);
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if (sectp && sectp->sct_x == sect.sct_x &&
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sectp->sct_y == sect.sct_y)
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continue;
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if (sect.sct_type == SCT_WATER || sect.sct_type == SCT_BTOWER ||
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sect.sct_type == SCT_BSPAN) {
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if (!sp->sct_coastal) {
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sp->sct_coastal = 1;
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putsect(sp);
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}
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return;
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}
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}
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if (sp->sct_coastal) {
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sp->sct_coastal = 0;
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putsect(sp);
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}
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}
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static void
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coastal_sea_to_land(struct sctstr *sp, int des)
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{
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int n;
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struct sctstr sect;
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update_coastal_flag(sp, NULL);
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for (n = 1; n <= 6; n++) { /* Directions */
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getsect(sp->sct_x + diroff[n][0], sp->sct_y + diroff[n][1], §);
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update_coastal_flag(§, sp);
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}
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}
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static void
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coastal_land_to_sea(struct sctstr *sp, int des)
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{
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int n;
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struct sctstr sect;
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sp->sct_coastal = 1;
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putsect(sp);
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for (n = 1; n <= 6; ++n) { /* Directions */
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getsect(sp->sct_x + diroff[n][0], sp->sct_y + diroff[n][1], §);
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if (!sect.sct_coastal) {
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sect.sct_coastal = 1;
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putsect(§);
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}
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}
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}
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void
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set_coastal(struct sctstr *sp, int des)
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{
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int old_water = 0;
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int new_water = 0;
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if (sp->sct_type == SCT_WATER || sp->sct_type == SCT_BTOWER ||
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sp->sct_type == SCT_BSPAN)
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old_water = 1;
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if (des == SCT_WATER || des == SCT_BTOWER || des== SCT_BSPAN)
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new_water = 1;
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if (new_water == old_water)
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return;
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else if (new_water)
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coastal_land_to_sea(sp, des);
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else
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coastal_sea_to_land(sp, des);
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}
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