player_02.rb

# -*- coding: utf-8 -*-
class Player
  attr_reader :position

  def initialize(position)
    @position = position
    @x_ratio = 1
    @y_ratio = 1
  end

  def move(direction)
    case direction
    when :up
      @position[:y] -= 10 * @y_ratio
    when :down
      @position[:y] += 10 * @y_ratio
    when :left
      @position[:x] -= 10 * @x_ratio
    when :right
      @position[:x] += 10 * @x_ratio
    end
  end
end

class FastPlayer < Player
  def initialize(position)
    super
    @x_ratio = @y_ratio = 2
  end
end

class KaniPlayer < Player
  def initialize(position)
    super
    @x_ratio = 4
    @y_ratio = 0.5
  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}

player = KaniPlayer.new player.position 
player.move(:up)
player.move(:left)
p player.position #=> {:x => 60, :y => 105}

移動倍率を持たせてみた