From: Greg Coit <gregcoit@...>
Date: 2006-04-20T16:34:05+09:00
Subject: Begining RRobots bot

Hi all,

I'm new to ruby and OO programming (been writing procedural perl for a
few years).  I'm hoping to use the rrobots modules to practice ruby
and OO (just missed the rubyquiz competition, eh?).  Here's what I
have so far.  This is not the smartest bot by any means (only 1 speed
and not the greatest tracking...), but at this point I'm mostly
interested in making sure my code is good clean OO and generally
follows the "ruby way" of doing things.  Any/all suggestions welcome!

Thanks!

Greg



require 'robot'

#available options:
#
#state:
#	team
#	battlefield_height
#	battlefield_width
#	energy
#	gun_heading
#	gun_heat
#	heading
#	size
#	radar_heading
#	time
#	game_over
#	speed
#	x
#	y
#actions:
#	accelerate
#	stop
#	fire
#	turn
#	turn_gun
#	turn_radar
#	broadcast
#	say
#events:
#	got_hit
#	robot_scanned
#	broadcasts

class GoofeyDuck

  include Robot

  @@radar_scan = 60  #make a class with methods???? ie scan.increase,
scan.decrease
  @@found = 0

  def tick events

    turn_radar(radar_dir)
    turn_gun(gun_dir)
    turn(tank_dir)
    accelerate(tank_acc)
    fire(gun_str)
    say("Dang!!!!") if (energy <= 1)

  end

  def radar_dir #return between -60 and 60

    if (!events['robot_scanned'].empty?) #found_em
      @@radar_scan = decrease(@@radar_scan, 1, 0)
      @@radar_scan = reverse_dir(@@radar_scan)
      found = 1
    elsif (found == 1) #had em last tick, adjusting....
      @@radar_scan = increase(@@radar_scan, 2, 60)
      @@radar_scan = reverse_dir(@@radar_scan)
      found = 0
    else
      @@radar_scan = increase(@@radar_scan, 2, 60)
    end
    @@radar_scan
  end

  def gun_dir #return between -30 and 30
    radar_heading - gun_heading
  end

  def tank_dir #return betweem -10 and 10
    if (!events['got_hit'].empty?) #got hit - run away!
      increase(heading, 10, 360)
    elsif ((x <= size) ||
           (y <= size) ||
           (x >= battlefield_width - size) ||
           (y >= battlefield_height- size)) #in a wall - right turn clyde!
      decrease(heading, 10, 0)
    else
      gun_heading - heading
    end
  end

  def tank_acc #return between -1 and 1
    1
  end

  def gun_str #return between 0.1 and 3
    0.5 #make based on size of radar_scan or event['robot_scanned'](as
either gets smaller, power gets larger)
  end


  #helper methods....

  def increase(current, amt, max)
    return current if (current.abs >= max)
    z = current <=> 0
    current + (z * amt)
  end

  def decrease(current, amt, min)
    return current if (current.abs <= min)
    z = current <=> 0
    current - (z * amt)
  end

  def reverse_dir(current)
    current * -1
  end
end