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Source:Vision.h

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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.    
The NetHack General Public License applies to screenshots, source code and other content from NetHack.
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 */

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