Source:NetHack 3.1.0/vision.h

Below is the full text to vision.h from the source code of NetHack 3.1.0. To link to a particular line, write [[NetHack 3.1.0/vision.h#line123 ]], for example.

Warning! This is the source code from an old release. For the latest release, see Source code

1.   /*	SCCS Id: @(#)vision.h	3.1	92/11/14	*/ 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 15.  #define IN_SIGHT 0x2 16.   17.   /*  18.    *  cansee	- Returns true if the hero can see the location. 19.   *  20.    *  couldsee	- Returns true if the hero has a clear line of sight to  21. *		 the location. 22.   */  23.   #define cansee(x,y)	(viz_array[y][x] & IN_SIGHT) 24.  #define couldsee(x,y)	(viz_array[y][x] & COULD_SEE) 25.   26.   /*  27.    *  The following assume the monster is not blind. 28.   *  29.    *  m_cansee	- Returns true if the monster can see the given location. 30.   *  31.    *  m_canseeu	- Returns true if the monster could see the hero. Assumes 32.   *		  that if the hero has a clear line of sight to the monster's  33. *		 location and the hero is visible, then monster can see the 34.   *		  hero. 35.   */  36.   #define m_cansee(mtmp,x2,y2)	clear_path((mtmp)->mx,(mtmp)->my,(x2),(y2)) 37.   38.   #define m_canseeu(m)		((!Invis || perceives((m)->data)) && !Underwater ? \  39.   				     couldsee((m)->mx,(m)->my) : 0) 40.   41.   /*  42.    *  Circle information 43.   */  44.   #define MAX_RADIUS 15	/* this is in points from the source */ 45.   46.   /* Use this macro to get a list of distances of the edges (see vision.c). */ 47.   #define circle_ptr(z) (&circle_data[circle_start[z]]) 48.   49.   #endif /* VISION_H */