1/*	SCCS Id: @(#)vision.h	3.4	1995/01/26	*/
2/* Copyright (c) Dean Luick, with acknowledgements to Dave Cohrs, 1990. */
3/* NetHack may be freely redistributed.  See license for details.	*/
4
5#ifndef VISION_H
6#define VISION_H
7
8#if 0	/* (moved to decl.h) */
9extern boolean vision_full_recalc;	/* TRUE if need vision recalc */
10extern char **viz_array;		/* could see/in sight row pointers */
11extern char *viz_rmin;			/* min could see indices */
12extern char *viz_rmax;			/* max could see indices */
13#endif
14#define COULD_SEE 0x1		/* location could be seen, if it were lit */
15#define IN_SIGHT  0x2		/* location can be seen */
16#define TEMP_LIT  0x4		/* location is temporarily lit */
17
18/*
19 * Light source sources
20 */
21#define LS_OBJECT 0
22#define LS_MONSTER 1
23
24/*
25 *  cansee()	- Returns true if the hero can see the location.
26 *
27 *  couldsee()	- Returns true if the hero has a clear line of sight to
28 *		  the location.
29 */
30#define cansee(x,y)	(viz_array[y][x] & IN_SIGHT)
31#define couldsee(x,y)	(viz_array[y][x] & COULD_SEE)
32#define templit(x,y)	(viz_array[y][x] & TEMP_LIT)
33
34/*
35 *  The following assume the monster is not blind.
36 *
37 *  m_cansee()	- Returns true if the monster can see the given location.
38 *
39 *  m_canseeu() - Returns true if the monster could see the hero.  Assumes
40 *		  that if the hero has a clear line of sight to the monster's
41 *		  location and the hero is visible, then monster can see the
42 *		  hero.
43 */
44#define m_cansee(mtmp,x2,y2)	clear_path((mtmp)->mx,(mtmp)->my,(x2),(y2))
45
46#define m_canseeu(m)	((!Invis || perceives((m)->data)) && \
47			  !(Underwater || u.uburied || (m)->mburied) ? \
48			     couldsee((m)->mx,(m)->my) : 0)
49
50/*
51 *  Circle information
52 */
53#define MAX_RADIUS 15	/* this is in points from the source */
54
55/* Use this macro to get a list of distances of the edges (see vision.c). */
56#define circle_ptr(z) (&circle_data[(int)circle_start[z]])
57
58#endif /* VISION_H */
59