*** empty log message ***

src/track.c

@@ -0,0 +1,68 @@
+/*	SCCS Id: @(#)track.c	3.3	87/08/08	*/
+/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
+/* NetHack may be freely redistributed.  See license for details. */
+/* track.c - version 1.0.2 */
+
+#include "hack.h"
+
+#define UTSZ	50
+
+STATIC_VAR NEARDATA int utcnt, utpnt;
+STATIC_VAR NEARDATA coord utrack[UTSZ];
+
+#ifdef OVLB
+
+void
+initrack()
+{
+	utcnt = utpnt = 0;
+}
+
+#endif /* OVLB */
+#ifdef OVL1
+
+/* add to track */
+void
+settrack()
+{
+	if(utcnt < UTSZ) utcnt++;
+	if(utpnt == UTSZ) utpnt = 0;
+	utrack[utpnt].x = u.ux;
+	utrack[utpnt].y = u.uy;
+	utpnt++;
+}
+
+#endif /* OVL1 */
+#ifdef OVL0
+
+coord *
+gettrack(x, y)
+register int x, y;
+{
+    register int cnt, ndist;
+    register coord *tc;
+    cnt = utcnt;
+    for(tc = &utrack[utpnt]; cnt--; ){
+	if(tc == utrack) tc = &utrack[UTSZ-1];
+	else tc--;
+	ndist = distmin(x,y,tc->x,tc->y);
+
+	/* if far away, skip track entries til we're closer */
+	if(ndist > 2) {
+	    ndist -= 2; /* be careful due to extra decrement at top of loop */
+	    cnt -= ndist;
+	    if(cnt <= 0)
+		return (coord *) 0; /* too far away, no matches possible */
+	    if(tc < &utrack[ndist])
+		tc += (UTSZ-ndist);
+	    else
+		tc -= ndist;
+	} else if(ndist <= 1)
+	    return(ndist ? tc : 0);
+    }
+    return (coord *)0;
+}
+
+#endif /* OVL0 */
+
+/*track.c*/