Source:NetHack 3.0.0/track.c
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Below is the full text to track.c from the source code of NetHack 3.0.0. To link to a particular line, write [[NetHack 3.0.0/track.c#line123]], for example.
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1. /* SCCS Id: @(#)track.c 1.4 87/08/08 2. /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */ 3. /* NetHack may be freely redistributed. See license for details. */ 4. /* track.c - version 1.0.2 */ 5. 6. #include "hack.h" 7. 8. #define UTSZ 50 9. 10. coord utrack[UTSZ]; 11. int utcnt = 0; 12. int utpnt = 0; 13. 14. void 15. initrack(){ 16. utcnt = utpnt = 0; 17. } 18. 19. /* add to track */ 20. void 21. settrack(){ 22. if(utcnt < UTSZ) utcnt++; 23. if(utpnt == UTSZ) utpnt = 0; 24. utrack[utpnt].x = u.ux; 25. utrack[utpnt].y = u.uy; 26. utpnt++; 27. } 28. 29. coord * 30. gettrack(x, y) 31. register int x, y; 32. { 33. register int i, cnt, ndist; 34. coord tc; 35. cnt = utcnt; 36. for(i = utpnt-1; cnt--; i--){ 37. if(i == -1) i = UTSZ-1; 38. tc = utrack[i]; 39. ndist = dist2(x,y,tc.x,tc.y); 40. if(ndist < 3) 41. return(ndist ? (coord *)&(utrack[i]) : 0); 42. } 43. return (coord *)0; 44. }