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 1.2 2003/06/17 04:25:24 dillon 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 initrack(){
  15         utcnt = utpnt = 0;
  16 }
  17
  18 /* add to track */
  19 settrack(){
  20         if(utcnt < UTSZ) utcnt++;
  21         if(utpnt == UTSZ) utpnt = 0;
  22         utrack[utpnt].x = u.ux;
  23         utrack[utpnt].y = u.uy;
  24         utpnt++;
  25 }
  26
  27 coord *
  28 gettrack(x,y) int x,y; {
  29 int i,cnt,dist;
  30 coord tc;
  31         cnt = utcnt;
  32         for(i = utpnt-1; cnt--; i--){
  33                 if(i == -1) i = UTSZ-1;
  34                 tc = utrack[i];
  35                 dist = (x-tc.x)*(x-tc.x) + (y-tc.y)*(y-tc.y);
  36                 if(dist < 3)
  37                         return(dist ? &(utrack[i]) : 0);
  38         }
  39         return(0);
  40 }