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Source:NetHack 3.1.0/vision.h

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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

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

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