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Annotation of 43BSDTahoe/games/hack/hack.track.c, revision 1.1.1.1

1.1       root        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: }

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