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.
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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 */