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. */
8 #if 0 /* (moved to decl.h) */
9 extern boolean vision_full_recalc; /* TRUE if need vision recalc */
10 extern char **viz_array; /* could see/in sight row pointers */
11 extern char *viz_rmin; /* min could see indices */
12 extern char *viz_rmax; /* max could see indices */
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 */
19 * Light source sources
25 * cansee() - Returns true if the hero can see the location.
27 * couldsee() - Returns true if the hero has a clear line of sight to
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)
35 * The following assume the monster is not blind.
37 * m_cansee() - Returns true if the monster can see the given location.
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
44 #define m_cansee(mtmp,x2,y2) clear_path((mtmp)->mx,(mtmp)->my,(x2),(y2))
46 #define m_canseeu(m) ((!Invis || perceives((m)->data)) && \
47 !(Underwater || u.uburied || (m)->mburied) ? \
48 couldsee((m)->mx,(m)->my) : 0)
53 #define MAX_RADIUS 15 /* this is in points from the source */
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]])