Source:Vision.h

Below is the full text to include/vision.h from NetHack 3.4.3. To link to a particular line, write [[vision.h#line123 ]], for example. 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) */ 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 */