AnimationRenderTarget完成した！

ART.rb

#coding: UTF-8

require 'dxruby'

module DXRuby
  def self.image?(v)
    Image === v || RenderTarget === v
  end
  
  module Animation
    attr_reader :bgimages, :index
    
    @@array_of_animation_render_target = []
    
    def self.update
      Sprite.update(@@array_of_animation_render_target)
    end
    
    Window.after_call[:update_array_of_animation_render_target] = self.method(:update)
    
    def initialize(width, height, bgimages, bgcolor=[0,0,0,0], interval: 1, index: 0, step: 1)
      super(width, height, bgcolor)
      @bgimages = bgimages.dup.keep_if{|x| DXRuby.image?(x)}
      @count = @interval = interval
      @index = index
      indexCheck
      @step = step
      
      @@array_of_animation_render_target << self
    end
    
    def update
      @count -= 1
      if @count < 0
        @index += @step
        indexCheck
        @count = @interval
      end
      unless @bgimages.empty?
        self.draw(0,0,@bgimages[@index],-10000)
      end
      super
    end
    
    def vanish
      super
      @@array_of_animation_render_target.delete(self)
    end
    
    def index=(v)
      @index = v
      indexCheck
      @index
    end
    
    def bgimages=(v)
      @bgimages = v.dup.keep_if{|x| DXRuby.image?(x)}
    end
    
    private
    def indexCheck
      @index = @index.to_i #整数にする
      while @index < 0 #小さすぎる間は
        if @bgimages.empty?
          @index = 0
        else
          @index += @bgimages.size
        end
      end
      while @index >= @bgimages.size #大きすぎる間は
        if @bgimages.empty?
          @index = 0
        else
          @index -= @bgimages.size
        end
      end
    end
  end
  
  class AnimationRenderTarget < RenderTarget
    include Animation
  end
  
  ART = AnimationRenderTarget
end

font = Font.new(32)
arr = Array.new(10){|i| Image.new(32, 32).drawFont(8,0,i.to_s,font)}
art = ART.new(32,32,arr,interval:15)
Window.loop do
  art.draw(0,0,Image.new(1,1,C_WHITE))
  Window.draw(0,0,art)
end