# File lib/rubygame/events/joystick_events.rb, line 105 def initialize( joystick_id, button ) unless joystick_id.kind_of?(Fixnum) and joystick_id >= 0 raise ArgumentError, "joystick_id must be an integer >= 0" end @joystick_id = joystick_id unless button.kind_of?(Fixnum) and button >= 0 raise ArgumentError, "button must be an integer >= 0" end @button = button end