Class: Lemmibot::Bot

Inherits:
Object
  • Object
show all
Defined in:
lib/lemmibot/bot.rb

Overview

A simulated toy robot on a tabletop

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Bot

Returns a new instance of Bot.



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# File 'lib/lemmibot/bot.rb', line 4

def initialize
  @pos_x = 0
  @pos_y = 0
  @direction = :north
  @placed = false
end

Instance Method Details

#move ⇒ Object 



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# File 'lib/lemmibot/bot.rb', line 26

def move
  # Move the bot one unit in the direction it is facing
  # TODO: Find a more elegant solution for this
  return false unless @placed
  case @direction
  when :north then return change_position(:y, 1)
  when :south then return change_position(:y, -1)
  when :east then return change_position(:x, 1)
  when :west then return change_position(:x, -1)
  end
end

#place(x, y, direction) ⇒ Object 



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# File 'lib/lemmibot/bot.rb', line 38

def place(x, y, direction)
  # Place the bot at a specified position, facing specified direction
  return false unless set_position(:x, x) &&
                      set_position(:y, y) &&
                      set_direction(direction)
  @placed = true
  true
end

#report ⇒ Object 



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# File 'lib/lemmibot/bot.rb', line 47

def report
  # Return a hash of the bot's current location and direction
  return false unless @placed
  {
    x: @pos_x,
    y: @pos_y,
    dir: @direction
  }
end

#turn(relative_direction) ⇒ Object 



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# File 'lib/lemmibot/bot.rb', line 11

def turn(relative_direction)
  # Rotate the bot 90 degrees to face another direction
  # TODO: Find a nicer way to find the new direction
  return false unless @placed
  change = if relative_direction == :left
             -1
           else
             1
           end
  next_direction_index = DIRECTIONS.index(@direction) + change
  next_direction_index = 0 if next_direction_index > DIRECTIONS.count - 1
  new_direction = DIRECTIONS[next_direction_index]
  set_direction(new_direction)
end