Source:NetHack 3.6.0/include/vision.h

Below is the full text to vision.h from the source code of NetHack 3.6.0. To link to a particular line, write [[Source:NetHack 3.6.0/include/vision.h#line123]], for example.

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 /* NetHack 3.6	vision.h	$NHDT-Date: 1432512777 2015/05/25 00:12:57 $  $NHDT-Branch: master $:$NHDT-Revision: 1.9 $ */
 /* Copyright (c) Dean Luick, with acknowledgements to Dave Cohrs, 1990. */
 /* NetHack may be freely redistributed.  See license for details.	*/
 
 #ifndef VISION_H
 #define VISION_H
 
 #if 0 /* (moved to decl.h) */
 extern boolean vision_full_recalc;	/* TRUE if need vision recalc */
 extern char **viz_array;		/* could see/in sight row pointers */
 extern char *viz_rmin;			/* min could see indices */
 extern char *viz_rmax;			/* max could see indices */
 #endif
 #define COULD_SEE 0x1 /* location could be seen, if it were lit */
 #define IN_SIGHT 0x2  /* location can be seen */
 #define TEMP_LIT 0x4  /* location is temporarily lit */
 
 /*
  * Light source sources
  */
 #define LS_OBJECT 0
 #define LS_MONSTER 1
 
 /*
  *  cansee()	- Returns true if the hero can see the location.
  *
  *  couldsee()	- Returns true if the hero has a clear line of sight to
  *		  the location.
  */
 #define cansee(x, y) (viz_array[y][x] & IN_SIGHT)
 #define couldsee(x, y) (viz_array[y][x] & COULD_SEE)
 #define templit(x, y) (viz_array[y][x] & TEMP_LIT)
 
 /*
  *  The following assume the monster is not blind.
  *
  *  m_cansee()	- Returns true if the monster can see the given location.
  *
  *  m_canseeu() - Returns true if the monster could see the hero.  Assumes
  *		  that if the hero has a clear line of sight to the monster's
  *		  location and the hero is visible, then monster can see the
  *		  hero.
  */
 #define m_cansee(mtmp, x2, y2) clear_path((mtmp)->mx, (mtmp)->my, (x2), (y2))
 
 #define m_canseeu(m)                                       \
     ((!Invis || perceives((m)->data))                      \
              && !(Underwater || u.uburied || (m)->mburied) \
          ? couldsee((m)->mx, (m)->my)                      \
          : 0)
 
 /*
  *  Circle information
  */
 #define MAX_RADIUS 15 /* this is in points from the source */
 
 /* Use this macro to get a list of distances of the edges (see vision.c). */
 #define circle_ptr(z) (&circle_data[(int) circle_start[z]])
 
 /* howmonseen() bitmask values */
 #define MONSEEN_NORMAL 0x0001   /* normal vision */
 #define MONSEEN_SEEINVIS 0x0002 /* seeing invisible */
 #define MONSEEN_INFRAVIS 0x0004 /* via infravision */
 #define MONSEEN_TELEPAT 0x0008  /* via telepathy */
 #define MONSEEN_XRAYVIS 0x0010  /* via Xray vision */
 #define MONSEEN_DETECT 0x0020   /* via extended monster detection */
 #define MONSEEN_WARNMON 0x0040  /* via type-specific warning */
 
 #endif /* VISION_H */