require 'gosu'

class Window < Gosu::Window
  def initialize
    super(500, 32, false)
    self.caption = "test gosu/ruby (Echap pour quitter)"
    @score = 0
  end

  def reset
    @score = 0
  end

  def button_down(id)
    close if id == Gosu::KbEscape
    reset if id == Gosu::KbF12
  end

  def update
    @text = Gosu::Image.from_text(self, "#{@score}", "Georgia", 24)
      @score -= 1 if button_down?(Gosu::KbDown) if @score >= 0
      @score += 1 if button_down?(Gosu::KbUp) if @score <= 200
  end

  def draw
    @text.draw(10,0,1)
  end
end

Window.new.show