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| # -*- coding: utf-8 -*- | |
| class Player | |
| attr_reader :position | |
| def initialize(position) | |
| @position = position | |
| end | |
| def move(direction) | |
| case direction | |
| when :up | |
| @position[:y] -= 10 | |
| when :down | |
| @position[:y] += 10 | |
| when :left | |
| @position[:x] -= 10 | |
| when :right | |
| @position[:x] += 10 | |
| end | |
| end | |
| end | |
| class FastPlayer < Player | |
| def move(direction) | |
| super | |
| super | |
| end | |
| end | |
| player = Player.new(:x => 100, :y => 100) | |
| player.move(:up) | |
| p player.position # => {:x => 100, :y => 90} | |
| player = FastPlayer.new player.position | |
| player.move(:down) | |
| p player.position #=> {:x => 100, :y => 110} |
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