84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/*
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Copyright (C) 2018-2019 Parallel Realities
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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.
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See the GNU General Public License for more details.
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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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#include "combat.h"
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int hasLineOfSight(Entity *src, Entity *dest)
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{
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int i, mx, my;
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float sx, sy, tx, ty, dx, dy;
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Entity **candidates, *e;
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SDL_Rect losBounds;
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sx = src->x + (src->w / 2);
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sy = src->y + (src->h / 2);
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tx = dest->x + (dest->w / 2);
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ty = dest->y + (dest->h / 2);
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losBounds.x = (int) MIN(src->x, dest->x);
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losBounds.y = (int) MIN(src->y, dest->y);
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losBounds.w = (int) (MAX(src->x, dest->x) - losBounds.x);
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losBounds.h = (int) (MAX(src->y, dest->y) - losBounds.y);
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candidates = getAllEntsWithin(losBounds.x, losBounds.y, losBounds.w, losBounds.h, NULL);
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getSlope(sx, sy, tx, ty, &dx, &dy);
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dx *= 8;
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dy *= 8;
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while (1)
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{
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sx -= dx;
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sy -= dy;
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mx = sx / MAP_TILE_SIZE;
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my = sy / MAP_TILE_SIZE;
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if (isSolid(mx, my))
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{
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return 0;
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}
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for (i = 0, e = candidates[i] ; e != NULL ; e = candidates[++i])
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{
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if (e != src && collision(sx, sy, 8, 8, e->x, e->y, e->w, e->h))
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{
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if (e->isSolid)
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{
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return 0;
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}
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if (e == dest)
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{
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return 1;
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}
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}
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}
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}
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return 0;
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}
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int enemyCanSeePlayer(Entity *e)
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{
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return hasLineOfSight(e, (Entity*)world.bob);
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}
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