/* Hunter */
/* This robot is a modified version of Mark Davis's Topgun. */
/* It chases rather than evades.  It calculates 'clicks' by */
/* dividing the distance from hitRange. */

/* by B. Thomson 11/86 */

/* external variables, that can be used by any function  */

int hitAngle,hitRange; /* used to pin-point opponent     */
int travelCount;       /* number of 'clicks' to travel in random direction */

/* main */
main()
{
  travelCount = 5;    /* 'clicks' to travel in given direction */
  hitAngle = 50;
  while (1)           /* loop is executed forever */
  {
    attack();          /* make sure movment is in the right direction */
    scan_n_shoot();   /* scan for opponent and shoot if in range */
  }

}  /* end of main */


/* make sure the robot is moving in the right direction */
attack()
{
    if (--travelCount || speed() < 51)
    {
      drive(hitAngle,0);
      travelCount = (hitRange / 80);
      while(speed() > 49);
      drive(hitAngle,100);
    }
}  /* end of attack */

/* scan with increaseing resolution until a shot can be taken */
scan_n_shoot()
{
  int limit;       /* set the scan limit */

  limit = hitAngle + 360;
  hitAngle -= 60;
  /* increased increment on hitAngle to 25 */
  while (((hitRange = scan((hitAngle += 25),10)) == 0 || hitRange > 700) && hitAngle <= limit)
    ;

  if (hitRange < 200 && hitRange > 0)
  {
    cannon(hitAngle,hitRange);
    while ((hitRange = scan(hitAngle,10)) < 200 && hitRange > 0)
      cannon(hitAngle,hitRange);
  }
  else
    if (hitAngle <= limit)
    {
      limit = hitAngle + 20;
/* altered decrement operator to norman '-=' */
      hitAngle -= 30;
      while (((hitRange = scan((hitAngle += 10),5)) == 0 || hitRange > 700) && hitAngle <= limit)
        ;

      if (hitRange < 400 && hitRange > 0)
      {
        cannon(hitAngle,hitRange);
        while ((hitRange = scan(hitAngle,5)) < 400 && hitRange > 0)
          cannon(hitAngle,hitRange);
      }
      else
        if (hitAngle <= limit)
        {
          limit = hitAngle + 20;
          hitAngle -= 24;
          while (((hitRange = scan((hitAngle += 4),2)) == 0 || hitRange > 700) && hitAngle <= limit)
            ;

          if (hitRange > 0)
          {
            cannon(hitAngle,hitRange);
            if ((hitRange = scan((hitAngle -= 10),10)) > 0)
              while ( ! cannon(hitAngle,hitRange) ); /* fire again */
            else
              if ((hitRange = scan((hitAngle += 20),10)) > 0)
                while ( ! cannon(hitAngle,hitRange) ); /* fire again */
          }
        }
    }
} /* end of scan_n_shoot */
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