Source:NetHack 2.2a/track.c
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Below is the full text to track.c from the source code of NetHack 2.2a. To link to a particular line, write [[NetHack 2.2a/track.c#line123]], for example.
Warning! This is the source code from an old release. For the latest release, see Source code
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1. /* SCCS Id: @(#)track.c 1.4 87/08/08 2. /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */ 3. /* track.c - version 1.0.2 */ 4. 5. #include "hack.h" 6. 7. #define UTSZ 50 8. 9. coord utrack[UTSZ]; 10. int utcnt = 0; 11. int utpnt = 0; 12. 13. initrack(){ 14. utcnt = utpnt = 0; 15. } 16. 17. /* add to track */ 18. settrack(){ 19. if(utcnt < UTSZ) utcnt++; 20. if(utpnt == UTSZ) utpnt = 0; 21. utrack[utpnt].x = u.ux; 22. utrack[utpnt].y = u.uy; 23. utpnt++; 24. } 25. 26. coord * 27. gettrack(x,y) register x,y; { 28. register int i,cnt,dist; 29. coord tc; 30. cnt = utcnt; 31. for(i = utpnt-1; cnt--; i--){ 32. if(i == -1) i = UTSZ-1; 33. tc = utrack[i]; 34. dist = (x-tc.x)*(x-tc.x) + (y-tc.y)*(y-tc.y); 35. if(dist < 3) 36. return(dist ? &(utrack[i]) : 0); 37. } 38. return(0); 39. }