Sample of drawing text with Gosu & Ruby.

gistfile1.rb

require 'gosu'

class GameWindow < Gosu::Window
  def initialize
    super 640,  480,  false
    self.caption = "Gosu Tutorial Game"

    @font = Gosu::Font.new(self, Gosu::default_font_name, 20)
  end

  def update
  end

  def draw
    @font.draw("Hello World!", 0, 0, 1, 1.0, 1.0, Gosu::Color::WHITE)
  end
end

window = GameWindow.new
window.show