1 /* SCCS Id: @(#)vision.h 3.3 95/01/26 */ 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) */ 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 */ 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