Part of a jruby game graphics library

graphics.rb

require 'set'

class Window
  def initialize
		@frame = javax.swing.JFrame.new

		@frame.default_close_operation = javax.swing.WindowConstants.EXIT_ON_CLOSE

		@input = Input.new(@frame)
	end

	def resize(w, h)
		@frame.set_size w, h
		self
	end

	def show
		@frame.visible = true
		self
	end

	def title(val = nil)
		if val.is_a? String
			@frame.title = val
			self
		else
			@frame.title
		end
	end

	alias :title= :title
end

class Input
	include java.awt.event.KeyListener

	CODES = {
		
	}

	def initialize(frame)
		@frame = frame

		@current = Set.new
		@new = Set.new

		frame.add_key_listener self
	end

	def update
		@current = @new
		@new = Set.new
	end

	def pressed?(code)
		code = CODES[code] if code.is_a? Symbol
		@current.include? code
	end

	def keyPressed(e)
		@new.add e.keyCode
	end

	def keyReleased(e)
		@new.delete e.keyCode
	end

	def keyTyped(e); end
end

$window = Window.new.title('Hello, Games!!!').resize(640, 480).show