[unix-history] / games / hack / hack.track.c

/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* hack.track.c - version 1.0.2 */

#include "hack.h"

#define	UTSZ	50

coord utrack[UTSZ];
int utcnt = 0;
int utpnt = 0;

initrack(){
	utcnt = utpnt = 0;
}

/* add to track */
settrack(){
	if(utcnt < UTSZ) utcnt++;
	if(utpnt == UTSZ) utpnt = 0;
	utrack[utpnt].x = u.ux;
	utrack[utpnt].y = u.uy;
	utpnt++;
}

coord *
gettrack(x,y) register x,y; {
register int i,cnt,dist;
coord tc;
	cnt = utcnt;
	for(i = utpnt-1; cnt--; i--){
		if(i == -1) i = UTSZ-1;
		tc = utrack[i];
		dist = (x-tc.x)*(x-tc.x) + (y-tc.y)*(y-tc.y);
		if(dist < 3)
			return(dist ? &(utrack[i]) : 0);
	}
	return(0);
}
Commit	Line	Data
15637ed4 RG	1	/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
	2	/* hack.track.c - version 1.0.2 */
	3
	4	#include "hack.h"
	5
	6	#define UTSZ 50
	7
	8	coord utrack[UTSZ];
	9	int utcnt = 0;
	10	int utpnt = 0;
	11
	12	initrack(){
	13	utcnt = utpnt = 0;
	14	}
	15
	16	/* add to track */
	17	settrack(){
	18	if(utcnt < UTSZ) utcnt++;
	19	if(utpnt == UTSZ) utpnt = 0;
	20	utrack[utpnt].x = u.ux;
	21	utrack[utpnt].y = u.uy;
	22	utpnt++;
	23	}
	24
	25	coord *
	26	gettrack(x,y) register x,y; {
	27	register int i,cnt,dist;
	28	coord tc;
	29	cnt = utcnt;
	30	for(i = utpnt-1; cnt--; i--){
	31	if(i == -1) i = UTSZ-1;
	32	tc = utrack[i];
	33	dist = (x-tc.x)(x-tc.x) + (y-tc.y)(y-tc.y);
	34	if(dist < 3)
	35	return(dist ? &(utrack[i]) : 0);
	36	}
	37	return(0);
	38	}