119     free(vel->tracker);  in FreeVelocityData()
432     free(vel->tracker);  in InitTrackers()
433     vel->tracker = (MotionTrackerPtr) calloc(ntracker, sizeof(MotionTracker));  in InitTrackers()
554 #define TRACKER(s, d) &(s)->tracker[TRACKER_INDEX(s,d)]
566         vel->tracker[n].dx += dx;  in FeedTrackers()
567         vel->tracker[n].dy += dy;  in FeedTrackers()
570     vel->tracker[n].dx = 0.0;  in FeedTrackers()
571     vel->tracker[n].dy = 0.0;  in FeedTrackers()
572     vel->tracker[n].time = cur_t;  in FeedTrackers()
573     vel->tracker[n].dir = GetDirection(dx, dy);  in FeedTrackers()
575                 dx, dy, vel->tracker[n].dir,  in FeedTrackers()
576                 cur_t - vel->tracker[vel->cur_tracker].time);  in FeedTrackers()
586 CalcTracker(const MotionTracker * tracker, int cur_t)  in CalcTracker()  argument
588     double dist = sqrt(tracker->dx * tracker->dx + tracker->dy * tracker->dy);  in CalcTracker()
589     int dtime = cur_t - tracker->time;  in CalcTracker()
615         MotionTracker *tracker = TRACKER(vel, offset);  in QueryTrackers()  local
618         age_ms = cur_t - tracker->time;  in QueryTrackers()
633         dir &= tracker->dir;  in QueryTrackers()
641         tracker_velocity = CalcTracker(tracker, cur_t) * velocity_factor;  in QueryTrackers()
674         MotionTracker *tracker = TRACKER(vel, used_offset);  in QueryTrackers()  local
677                     used_offset, tracker->dx, tracker->dy,  in QueryTrackers()
678                     cur_t - tracker->time);  in QueryTrackers()