RobotZippy

class Zippy include Robot

def tick events @direction ||= :right

unless pointing_right?
  turn_right
  return
end

if @direction == :right
  if distance_from_max > 8
    accelerate(1)
  else
    stop
    @direction = :left if stopped?
  end
else
  if distance_from_min > 8
    accelerate(-1)
  else
    stop
    @direction = :right if stopped?
  end
end

turn_gun(-1)
unless events['robot_scanned'].empty?
  say 'GOTCHA!'
  fire 3
end

end

def stopped? speed == 0 end

def pointing_right? heading == 0 end

def turn_right new_heading = heading > 10 ? heading - 10 : heading turn(-new_heading) end

def distance_from_max (battlefield_width - size) - x end

def distance_from_min x - size end

end