games/hack/hack.track.c

   1 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
   2 /* hack.track.c - version 1.0.2 */
   3 /* $FreeBSD: src/games/hack/hack.track.c,v 1.4 1999/11/16 10:26:38 marcel Exp $ */
   4 /* $DragonFly: src/games/hack/hack.track.c,v 1.3 2006/08/21 19:45:32 pavalos Exp $ */
   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(void)
  16 {
  17         utcnt = utpnt = 0;
  18 }
  19
  20 /* add to track */
  21 void
  22 settrack(void)
  23 {
  24         if(utcnt < UTSZ) utcnt++;
  25         if(utpnt == UTSZ) utpnt = 0;
  26         utrack[utpnt].x = u.ux;
  27         utrack[utpnt].y = u.uy;
  28         utpnt++;
  29 }
  30
  31 coord *
  32 gettrack(int x, int y)
  33 {
  34 int i,cnt,dst;
  35 coord tc;
  36         cnt = utcnt;
  37         for(i = utpnt-1; cnt--; i--){
  38                 if(i == -1) i = UTSZ-1;
  39                 tc = utrack[i];
  40                 dst = (x-tc.x)*(x-tc.x) + (y-tc.y)*(y-tc.y);
  41                 if(dst < 3)
  42                         return(dst ? &(utrack[i]) : 0);
  43         }
  44         return(0);
  45 }