Dragon for Lincoln

gistfile1.rb

class Creature

	def self.metaclass; class << self; self; end; end

	def self.traits(*arr)
		return @traits if arr.empty?

		#1. Set up accessors for each variable
		attr_accessor *arr

		#2. Add a new class method to for each trait.
		arr.each do |a|
			metaclass.instance_eval do
				define_method(a) do |val|
					@traits ||= {}
					@traits[a] = val
				end
			end
		end

		#3. For each monster, the initialize method
		#   should use the default number for each trait.

		class_eval do
			define_method(:initialize) do
				self.class.traits.each do |k,v|
					instance_variable_set("@#{k}", v)
				end
			end
		end
	end

	#Creature attributes are read-only
	traits :life, :strength, :charisma, :weapon

	#This method applies a hit taken during a fight.
	def hit(damage)
		p_up = rand(charisma)
		if p_up % 9 == 7
			@life += p_up / 4
			puts "[#{self.class} magick powers up #{p_up}!]"
		end
		@life -= damage
		puts "[#{self.class} has died.]" if @life <= 0
	end

	#This method takes one turn in a fight.
	def fight(enemy, weapon)
		if life <= 0
			puts "[#{self.class} is too dead to fight!]"
			return
		end

		#Attack the opponent
		your_hit = rand(strength + weapon)
		puts "[You hit #{your_hit} points of damage!]"
		enemy.hit(your_hit)

		#Retaliation

		p enemy
		if enemy.life > 0
			enemy_hit = rand(enemy.strength + enemy.weapon)
			puts "[Your enemy hit with #{enemy_hit} points of damage!]"
			self.hit(enemy_hit)
		end
	end
end

class Dragon < Creature
	life 1340		# tough scales
	strength 451	# bristling veins
	charisma 1020	# toothy smile
	weapon 939		# fire breath
end